264 results about "Infrasonic waves" patented technology

An emergency system for treatment of a patient (20) experiencing an acute vascular obstruction, employing a non-invasive vibrator (10), optimally in conjunction with drugs, for disrupting and lysing thromboses, relieving spasm (if associated), and thereby restoring blood perfusion. Vibrator (10) is operable in the sonic to infrasonic range, with a source output of up to 15 mm. For acute myocardial infarction cases, a pair of contacts (12), are advantageously placed to bridge the sternum at the fourth intercostal space. Vibration is initiated at 50 Hz (or any frequency, preferably within the 20-120 Hz range), and is ideally adjusted to a maximal amplitude (or force) deemed tolerable and safe to the patient (20), preferably with the administration of thrombolytic agents or other form of drug therapy. A synergistic effect is achieved between vibration and drugs to facilitate the disruption of thromboses, relieve spasm, and restore blood perfusion. In a variation, ultrasonic imaging may be used to direct vibration therapy.

A non-invasive ocular therapy for vision disorders is provided. First and second electrodes of a direct current source are electrically contacted so as to deliver current to and / or about an area proximal one or more eyes of a subject. A direct electrical current of between about 1-800 microamps, at a resistance assumption of about 500 ohms, is generated between the electrodes for a preselected duration. Preferably, the direct electrical current is generated at a select frequency profile as a function of time, and with a carrier signal of about 10,000-12,000 hertz. Advantageously, the subject therapy is augmented via application of light energy to the eye(s), as well as by the application of infrasonic sound waves directly into eyes.

The invention discloses a system implementing pipeline leak detection by utilizing an infrasonic wave. Two infrasonic wave sensors are respectively installed on an upstream detection point and a downstream detection point of a pipeline needing to be detected; infrasonic wave signals collected by the infrasonic wave sensors and generated by pipeline leakage are input to a signal acquisition analysis system. The signal acquisition analysis system determines the position of leakage generation according to the condition that the time difference of the infrasonic wave signals to upstream detectionpoint and to downstream multiplies the speed of the sound wave in fluid, and exchanges information with external through the two communication modules of GPRS and CDMA, fiber optic communication or Ethernet communication, etc. The invention discloses a system satisfying several leak conditions, and implementing pipeline leak detection by infrasonic at different working conditions.

The invention provides a pipeline blockage positioning method and device, and mainly solves the problems that artificial pipeline blockage detection is difficult and the efficiency is low. The pipeline blockage positioning method is characterized by comprising steps as follows: a detection device consisting of a core control panel, a compressed air pump, a infrasonic wave sensor, a pressure sensor, a temperature sensor, an electromagnetic valve for controlling release of sonic waves, a nozzle valve, an exhaust valve and a connecting pipeline is mounted on a to-be-detected pipeline, and acquires the time difference delta t between the occurrence and echo of an infrasonic wave through an infrasonic wave collection module; after a pipeline blockage positioning calculation module acquires pressure and temperature in the pipeline, a sound velocity calculation module calculates the propagation velocity c of the infrasonic wave in the pipeline, the passing path of the infrasonic wave is shown as follows: L=c*delta t, and the distance between the pipeline blockage position and a pipe orifice is as follows: s=L / 2. The blockage position can be accurately positioned with the method, and the detection efficiency is effectively improved.

The invention discloses an oil pipeline leakage detection and positioning system, which is mainly and technically characterized in that the system comprises a data acquisition module, a signal conditioning module, a data processing and analysis module, a sound-light alarm module, a display module, a GPS (Global Positioning System) module, a GSM (Global System for Mobile Communications) module, a GPRS (General Packet Radio Service) network and a monitoring center, the data acquisition module comprises a pressure transmitter, an infrasonic wave sensor and a flowmeter, the signal conditioning module comprises a current / voltage conversion module, a counting module and an analog filter module, the data processing and analysis module comprises a controller, the data acquisition module is connected with the signal conditioning module, the signal conditioning module is connected with the data processing and analysis module, the sound-light alarm module, the display module, the GPS module and the GSM module are connected with the data processing and analysis module, and the GSM module is connected with the monitoring center through the GPRS network. The oil pipeline leakage detection and positioning system has the advantages that the leakage detection sensitivity is high, the real-time performance is strong, the positioning accuracy is high and the cable resources are greatly saved.

The invention relates to a pipeline leakage recognizing and positioning system and method based on sound wave imaging. The pipeline leakage recognizing and positioning system and method are mainly characterized in that the system comprises pipeline infrasonic wave sensors, digitalizers, direct-current voltage stabilizing power sources and a monitoring server; the pipeline infrasonic wave sensors are arranged at the two ends of a measured pipeline respectively, and sensing heads of the pipeline infrasonic wave sensors are in complete contact with a medium in the pipeline and immersed in the medium in the pipeline through open holes in the measured pipeline; the pipeline infrasonic wave sensors upload measured signals to the monitoring server through the digitalizers; and the monitoring server calculates a sound and image graph for sound pressure distribution in the part, between the two pipeline infrasonic wave sensors, of the pipeline according to the measured signals uploaded by the two digitalizers, and the position and strength of a leakage sound source are recognized on the sound and image graph. According to the pipeline leakage recognizing and positioning system and method based on sound wave imaging, leakage is recognized based on the stability of the sound and image graph according to the wideband characteristic of leaking sounds, the accuracy of leakage recognition is improved and reaches more than 95%, the rate of false alarms is lower than 5%, the leakage process can be reflected, and the leakage flow is estimated.

The invention relates to a leakage monitoring system, method and device for a pipeline and a server. The method includes the steps that infrasonic signal, pressure, temperature and flow data in the pipeline are obtained; infrasonic leakage detection is performed according to an infrasonic signal so that the leakage state and the leakage occurrence time of the pipeline can be obtained; negative pressure wave leakage detection is performed according the pressure and temperature data so that the leakage state and the leakage occurrence time of the pipeline can be obtained; flow balance leakage detection is performed according to the flow data so that the leakage state of the pipeline can be obtained; the leakage occurrence time obtained according to infrasonic leakage detection and / or leakage occurrence time obtained according to negative pressure wave leakage detection are / is output to the server. The leakage monitoring device integrating the three leakage monitoring methods achieved through infrasonic waves, negative pressure waves and flow balance can achieve the effects that the methods are complementary, the leakage alarming rate is increased, and the error alarming rate and the missing alarming rate are reduced.

The invention relates to an automatic infrasonic wave non-pressure oil well liquid level monitoring instrument. A gas storage chamber, a gas chamber pressure sensor, a gas emission device, an infrasonic wave receiving and processing device and a gas-collecting device are arranged in a shell of the monitoring instrument; the gas chamber pressure sensor is connected with the gas storage chamber; the monitoring instrument is also provided with a gas generation device; a gas inlet of the gas generation device is connected with the gas-collecting device through a pipeline; and a gas outlet of the gas generation device is connected with the gas storage chamber through a pipeline. The automatic infrasonic wave non-pressure oil well liquid level monitoring instrument extracts gas from an oil well sleeve, and pressurizes and injects the gas into the gas storage chamber to generate an infrasonic wave pulse required by the measured liquid level; and gunpowder sound bombs or nitrogen cylinders are replaced, so that the automatic infrasonic wave non-pressure oil well liquid level monitoring instrument can work on the non-pressure oil well for a long time automatically, continuously and stably.

The invention discloses a gas pipeline leakage detecting and positioning system and method based on a non-intrusive sensor. The system comprises the non-intrusive infrasonic wave sensor, a timer, a signal conditioner, a filter, an analog-digital converter, a data transmission medium and a central control computer. The detecting and positioning method comprises the steps that the non-intrusive infrasonic wave sensor collects infrasonic wave signals when a gas pipeline leaks and infrasonic wave signals when a gaseous medium is propagated; the timer marks moments when the infrasonic wave signals are collected; the signal conditioner supplies power to the non-intrusive infrasonic wave sensor and performs signal conditioning; the filter performs filtering on the infrasonic wave signals; the analog-digital converter converts electric signals collected by the sensor into digital signals, and the converted digital signals are transmitted to the central control computer through the data transmission medium for data storage and analysis. According to the gas pipeline leakage detecting and positioning system and method based on the non-intrusive sensor, cost is low, and sensitivity is high; it is avoided that the pipeline is perforated for installing the system, so that the running state of the existing pipeline is not affected, and adaptability is high.

The invention discloses a gas pipeline leakage point detection device and a detection method, and relates to the field of gas pipeline detection. The gas pipeline leakage point detection device comprises a sensor module, a data transmission module, a fixed IP line, a server, a gas pipeline leakage alarm management system and a management computer. The sensor module acquires flow data, pressure data and infrasonic wave data of a gas pipeline. The data transmission module is connected with the sensor module. The fixed IP line is connected with the data transmission module. The server is connected with the fixed IP line, and the flow data, the pressure data and the infrasonic wave data are uploaded to the server through the data transmission module and the fixed IP line. The gas pipeline leakage alarm management system is installed in the server, receives, calculates and analyzes the flow data, the pressure data and the infrasonic wave data, shows the gas running state and gives an alarm.The management computer is connected with the server and used for managing the gas pipeline leakage alarm management system. By the adoption of the gas pipeline leakage point detection device and thedetection method, gas feature graphs of different road sections are provided, the number of influence factors such as the environment is reduced, the false alarm rate of gas alarms is reduced, and the detection accuracy and the alarm efficiency are high.

The embodiment of the invention provides a tone quality configuration method and a mobile terminal. The method comprises the steps of outputting a first audio signal via a loudspeaker, wherein the first audio signal carries an infrasonic wave signal; according to a second audio signal collected by the microphone, acquiring a target amplitude value corresponding to the infrasonic wave signal; according to the target amplitude value, judging whether the current wearing state of an earphone is a standard wearing state; if no, extracting a locally stored target compensation array set correspondingto the target amplitude value; and performing tone quality compensation on the first audio signal according to the target compensation array set. Therefore, the wearing state of the current earphonecan be monitored during a process that a user uses the earphone, and under the condition that the wearing state is nonstandard, the current tone quality is compensated via the pre-stored compensationarray set, and thus the negative effects on middle and low frequencies when the coupling of the earphone is loosen are effectively improved, and the audition experience of the earphone user is effectively enhanced.

The invention relates to a mud-rock flow monitoring and alarming system based on an infrasonic wave. The mud-rock flow monitoring and alarming system comprises an infrasonic sensor, a signal processing circuit, a data acquisition card and a computer. The infrasonic sensor is used for acquiring mud-rock flow infrasonic signals. The signal processing circuit is used for amplifying and filtering the mud-rock flow infrasonic signal. The signal acquisition card performs analog-to-digital conversion on the mud-rock flow infrasonic signal after signal processing and transmits the converted result to the computer. The computer utilizes an HHT method for performing time-frequency domain analysis on the signal and calculates out the power spectrum of the signal, thereby obtaining signal energy and furthermore determining a mud-rock flow disaster. The mud-rock flow monitoring and alarming system can perform real-time monitoring on occurrence of the mud-rock flow disaster and furthermore can perform alarming.

The invention relates to a low-frequency sound wave generation technology and provides a method and a device for generating a low-frequency sound wave. The low-frequency sound wave is obtained in the manner that a high-frequency electric signal is modulated by using a low-frequency electric signal. A modulating way can be a frequency modulation way, an amplitude modulation way or a phase modulation way and the like. An obtained modulating signal is converted by an energy converter, and thus, a sound wave signal with certain frequency spectrum content can be output, and can be low to an infrasonic wave band. The method for generating the low-frequency sound wave provided by the invention is simple. The device is small in size and low in manufacturing cost. The method and the device for generating the low-frequency sound wave are suitable for low-frequency sound wave research in laboratories and medical science.

The invention discloses a method and a system for positioning coal rock dynamic disaster through infrasonic wave monitoring. The system comprises a monitoring main station and a plurality of monitoring substations, and the monitoring substations are connected with the monitoring main station through a fiber optic network; each monitoring substation is composed of three infrasonic wave sensors arranged in a triangular form, and the infrasonic wave sensors are connected with an infrasonic wave monitor; and the monitoring main station is provided with a computing server. The positioning method isthat the main station computing server filters collected data, the time-frequency analysis is performed on the data by the short-time Fourier transform (STFT), the frequency energy density is compared, signals of the main frequency band are extracted, and the calculation result is positioned through statistical analysis and time delay estimation theory. The system monitors the infrasonic wave signal generated by the fracture of the loaded coal rock. Through this method, the non-contact and regional tests are carried out on the stress distribution state of the surrounding rock of the tunnel ormines to determine the area of coal rock fracture and stress anomaly. The method is simple in installation and operation, has little impact on production, and has a large detection range and a long detection distance.

The invention discloses a method for preparing a piezoelectric polymer functional film with an ordered micro-cellular structure by using a template, and relates to a preparation technique of the piezoelectric polymer functional film with the ordered micro-cellular structure. The method firstly prepares a template (4) with a concave-convex ordered pattern, then prepares an ordered porous polymer single-layer thin film (2) which shows a pattern corresponding to the concave-convex ordered pattern of the template (4), then clamps the ordered porous polymer single-layer thin film (2) between two dense films, and carries out hot-pressing to form the piezoelectric polymer functional film with the ordered micropore structure. The method has simple technique, not only can obtain an electromechanical functional film with high thermostability and high pressure flexibility, and has more outstanding advantages of the capability of precisely controlling the microstructure of the film and electric charge of the storing space. The obtained functional film can be used for manufacturing electroacoustic sensors, acoustoelectric sensors, infrasonic wave sensors, ultrasonic sensors, plate loudspeakers, actuators and robot skin and the like, and has wide application prospect in the fields of communication, public security, control, medical treatment, robots, military and the like.

The invention relates to a distributed optical fiber multi-parameter pipeline leakage positioning and warning system and a leakage positioning method. The distributed optical fiber multi-parameter pipeline leakage positioning and warning system comprises a sensing optical fiber laid in the same ditch as a pipeline and a DTS system connected with the sensing optical fiber. At least two negative-pressure wave monitoring devices are arranged on the pipeline. A negative-pressure wave monitoring system and the DTS system are both connected with a monitoring center through communication interfaces and the Ethernet network. Each negative-pressure wave monitoring device comprises a pressure flow transmitter connected with the pipeline, and the pressure flow transmitter is connected with a data acquisition unit. The data acquisition units are connected with GPS timing antennas. The distributed optical fiber multi-parameter pipeline leakage positioning and warning system has the beneficial effects that the defects that a negative-pressure wave monitoring and infrasonic wave leakage monitoring system cannot conduct monitoring and cannot conduct accurate positioning due to small leakage and adistributed optical fiber temperature leakage monitoring system cannot monitor leakage due to a low-temperature difference are overcome; based on the temperatures, obtained by a distributed optical fiber temperature measuring system, of all points, the wave velocity is calculated and corrected accurately, and accurate positioning of the leakage position is achieved.

The invention provides a mobile phone that is controlled by infrasonic wave. The mobile phone includes a receiving cell, an analysis cell, a processing cell, an operation cell and a control cell. The receiving cell is used for receiving the infrasonic wave. The analysis cell is used for transmitting the received infrasonic wave signal into an electrical signal and sending to the processing cell. The processing cell is used for transmitting the electrical signal into a data signal. The operation cell is used for transmitting the data signal into an operation indication for operating the mobile phone, and processing various operation to the mobile phone operation system. The control cell is used for controlling the operation indication corresponding to various infrasonic wave. The invention also includes a method for operating the mobile phone through infrasonic wave. The infrasonic wave has strong anti-damping characteristic and penetration characteristic, even certain distance exists between the user and the mobile phone, the infrasonic wave also is convenient to remote control the mobile phone without interference which provides convenient to user.

The invention provides a remote detection device, a method and a system for the detection of the leakage of the natural gas pipeline, which are based on the infrasonic wave. The detection device comprises that an infrasonic wave sensor element which is mounted on the detecting natural gas pipeline detects the leakage infrasonic wave signal in the pipeline to produce the sensor data; a data processing element is coupled with the infrasonic wave sensor element to receive the sensor data, analyze the data, identify and process the leakage and produce the processing result data; a time sequence collection element is coupled with the data processing element to receive the synchronous time base signal and synchronize the time clock according to the synchronous time base signal; a communication interface element is coupled with the data processing element for the output of the sensor data and the processing result data; a display element is coupled with the data processing element for the display of the sensor data and the processing result data.

A comprehensive oil and gas pipeline leakage monitoring system mainly comprises infrasonic wave sensors, an acoustics monitoring terminal, a clock server and a leakage monitoring server; two infrasonic wave sensors are mounted at each of an upstream detecting point and a downstream detecting point of a pipeline that needs monitoring; an infrasonic wave signal is generated when the pipeline leaks; whether leakage occurs or not can be judged through comparing the infrasonic wave signal with normal background noise; the infrasonic wave sensors preprocess and amplify the collected infrasonic wave signal generated due to leakage of the pipeline, convert the collected infrasonic wave signal into a multichannel sound wave signal of the numeric field, and transmit the multichannel sound wave signal to a signal acquisition and analysis system; and the signal acquisition and analysis system determines the leakage position according to the difference of time when the infrasonic wave signal reaches the upstream detecting point and the downstream detecting point and the propagation velocity data of a sound wave in a fluid. The comprehensive oil and gas pipeline leakage monitoring system adopts the clock server to solve the time synchronization problem of upstream monitoring equipment and downstream monitoring equipment and provides time marks for all data.

The invention relates to a single station infrasonic wave signal recognition and extraction method, which comprises the steps that a single infrasonic sound monitoring station receives infrasonic wave signals; abnormality recognition is performed on the received infrasonic wave signals based on four elements such as the energy flow peak, the zero-crossing rate, the wind speed and noise and wavelet time-frequency characteristics so as to find out a time period in which an abnormal moment is distributed, thereby acquiring four groups of time period sequences; comparative analysis is performed on the four groups of time period sequences to find out overlapped time periods in the four groups of time period sequences, the overlapped time period sequence is marked on the waveform of the infrasonic wave signals so as to be used for indicating the waveform and the location of valid event suspected signals, and then further recognition and classification are performed on the valid event suspected signals by using valid event historical signal characteristics, so that the type or the source of the infrasonic wave signals is judged.

The present invention belongs to the household daily necessary electronic product, in particular to an electronic pest-driving system driving the pests such as the rat and cockroach with a physic method. The electronic pest-driving device on the prior market has poor driving effect, which results in the certain adaptation of the pests such as the rat and the cockroach in the long-term application process. Based on the working principle of the prior electronic pest-driving device, the present invention proposes to adopt the single chip insertion-typed technology and the real-time clock chip and frequency-conversion technology to realize the digital electronic technology so as to produce the extremely-low-frequency electromagnetic wave, ultrasonic wave and the infrasonic wave having different frequencies and having no harm for the human body to drive the pests such as the rat and the cockroach. Through controlling the clock chip, the present invention produces the electromagnetic wave, the ultrasonic wave and the infrasonic wave in other frequent band after the system works for a period of time, thereby effectively resolving the problems of the prior electronic pest-driving device that the frequent point is limit and the effect is reduced due to the adaptation of the animal after the system is used for a period of time.

The invention relates to a natural-disaster infrasonic wave monitoring system. The system comprises monitoring stations and a center data server. The plurality of monitoring stations are connected to the center data server so as to form a monitoring network. One monitoring station comprises an infrasonic wave sensor, a meteorological three-element sensor, a fixed-point GPS measuring instrument, a data acquisition transmission module and a wind noise reduction pipeline. The infrasonic wave sensor is installed in the wind noise reduction pipeline. The infrasonic wave sensor collects infrasonic wave data. The meteorological three-element sensor collects meteorological data including a temperature, a rainfall and a wind speed. The fixed-point GPS measuring instrument measures ionospheric disturbance. The center data server comprises a data storage server, an infrasound signal analysis module and a natural disaster determination module. The infrasound signal analysis module analyzes a characteristic of infrasonic wave data and transmits a result to the natural disaster determination module. Based on the characteristic of the infrasonic wave data, the natural disaster determination module combines GPS data and meteorological three-element data to determine a natural disaster condition.

Exemplary practice of the present invention provides an air vehicle and at least one interferometric double-path fiber optic sensor connected with the air vehicle. Each fiber optic sensor includes a pair of optical fibers, viz., an optical sensing fiber and an optical reference fiber, in a parallel and propinquus relationship. The paired optical fibers of each fiber optic sensor are attached to the air vehicle either (i) circumferentially around the fuselage or (ii) lengthwise along the fuselage or (iii) span-wise along the wings and across the fuselage, and are configured whereby the sensing fiber is exposed to the atmosphere and the reference fiber is not. Each fiber optic sensor senses atmospheric infrasound but does not sense atmospheric wind noise, which is negated by incoherency associated with design lengthiness of the optical fiber pair. Noise and strain due to temperature, vibration, and propulsion are neutralized via interferometric common mode rejection.

The invention belongs to a disaster rescuing technology and especially relates to a rescuing and positioning system by knocks for a mine disaster. In the rescuing and positioning system provided by the invention, knocks made by trapped people in a mine disaster are received and processed, and by the characteristics of strong penetrability of low frequency and even infrasonic wave signals in knock vibration, the position of a knock source is determined through the speed difference between the longitudinal wave mode and the transverse wave mode and the directivity of a vector vibration sensor. Each positioning and measuring point of the system provided by the invention comprises a signal collecting module, a signal frequency range dividing module, a frequency range priority selecting module, a rescuing point positioning and calculating module and a wireless data transmitting module. Each positioning and measuring point is an independent system, and multiple positioning and measuring points can form a search network to cover the whole detecting region as required. The rescuing and positioning system provided by the invention is not influenced by severe environments and equipment failure in the mine disaster, and can be independently used or combined with other positioning technologies to form a comprehensive positioning system for mine disasters.

The invention relates to an infrasonic wave detection device which comprises a laser device and a vibrating diaphragm single-slit device, wherein the laser device is used for generating a laser beam; the vibrating diaphragm single-slit device comprises two cutter blades and a sensitive diaphragm; the two cutter blades are arranged on the same plane and separated from each other to form a single slit; one of the cutter blades is arranged in the deformation region of the sensitive diaphragm; the sensitive diaphragm is arranged in the infrasonic wave region; and the laser beam passes through the single slit and generates single slit diffraction fringes. The infrasonic wave enables the sensitive diaphragm to generate vibration, so that the cutter blades slightly vibrate to change the width of the single slit and further enable the single slit diffraction fringes to change. By detecting the infrasonic waves with the single slit diffraction fringes of the laser beam, the infrasonic wave detection device has the advantages of simple overall structure, low requirements for working accuracy of devices, low manufacturing cost and easy realization.

The invention discloses a fully automatic in-pipe fluid leakage online supervision and locating system and method. The system comprises a main station system and two or more than two substation systems. Each substation system comprises an infrasonic wave sensor, a pressure transducer, a flow meter, a valve, an external power supply and a digitizer. The in-pipe sound wave levels are assessed to automatically select the infrasonic wave method and (or) the transient model method to conduct leakage alarm and locate leakage points. Compared with the prior art of supervision and locating system, the fluid leakage online supervision and locating system has a higher locating precision, higher accuracy and a higher work condition adaptability.

An infrasound testing device consists of an infrasound sensor, a lowpass, an analog-digital converter, an SCM and an LCD which are respectively connected with a battery, wherein, the output end of the infrasound sensor is connected with the input end of the lowpass, the output end of the lowpass is connected with the input end of the analog-digital converter, the output end of the analog-digital converter is connected with the input end of the SCM, and the output end of the SCM is connected with the LCD. An amplitude modulation principle is utilized to measure the slow changes of a capacitance microphone, an acoustic compliant element in the infrasound sensor acts as an arm of the capacitance bridge, the input end is connected with a high-frequency voltage with same amplitude, when the infrasound wave acts on the film, the film generates a displacement with the change of the sound pressure, which result in the capacitance changes of the plate capacitor, so that the balance of the capacitance bridge is changed, therefore, the output end can obtain amplitude modulation wave modulated by the capacitance change, the amplitude modulation wave is sent to a modern after the voltage is amplified, then the low-frequency electrical signals are gained, and the detection of the infrasound wave is achieved.

The invention discloses an infrasonic wave generator for testing the liquid level of an oil well, which comprises an inner air cylinder assembly, an outer air cylinder assembly, an upper end cover and an air compression device, wherein a guide frame and an outlet drain plug are arranged between the inner air cylinder assembly and the outer air cylinder assembly; the inner air cylinder assembly comprises an air cylinder sleeve; the outer air cylinder assembly comprises an outer air cylinder; the upper end cover is connected to the outside of the outer air cylinder assembly and is provided withan air hole; one end of the inner air cylinder assembly is provided with an upper drain plug, and the other end of the inner air cylinder assembly is also provided with an air hole; the air compression device comprises a pull rod; one end of the pull rod is provided with a piston; the piston is used for sealing the air cylinder sleeve in the inner air cylinder assembly; a compression spring is arranged at the periphery of the pull rod; the piston is elastically connected with the inner side of the outer air cylinder assembly through the compression spring; and the other end of the pull rod isprovided with a handle. In the invention, sound is produced in an air compression mode, and the generator has the advantages of saving the costs of sound bombs and nitrogen and preventing potential safety hazards caused by the explosion of gunpowder in the sound bombs and is environmentally friendly, economical and pollution-free.

The invention discloses a sensitivity enhancement type optical fiber acoustic sensor probe and a sensitivity enhancement structure thereof. The sensitivity enhancement structure comprises a first shell, a first diaphragm and a second diaphragm, wherein the first shell is provided with a first port and a second port, and the size of the first port is greater than the size of the second port; the first diaphragm is tightened and arranged on the first port; the second diagram is tightened and arranged on the second port and is provided with a reflection surface, the central zone of the reflectionsurface and the end surface of an optical fiber are opposite, a gap is formed, and the deformation resistance ability of the second diaphragm is smaller than the deformation resistance ability of thefirst diaphragm; and a vibration transmission cavity is jointly formed by the first shell, the first diagram and the second diagram, the first diagram generates vibration through an induction sound signal, and the vibration is transferred to the second diagram through the vibration transmission cavity to cause gap changes so as to modulate an optical signal transferred by the optical fiber. By use of the sensitivity enhancement structure, probe sensitivity can be effectively enhanced, the signal-to-noise ratio of the probe is improved, and the sensitivity enhancement structure is especially suitable for the high-sensitivity low-noise detection of infrasonic wave.

The invention belongs to the field of biomedical engineering, and relates to a method and device for relieving fatigue through infrasonic waves. The method for relieving the fatigue includes the step that the infrasonic waves are used for inducing brain waves so as to make the brain enter a deep sleep state fast, and at the moment, the brain waves are delta rhythm waves, so that the brain blood oxygen of a person is supplemented, the tension state of the human body is relaxed, physical strength is recovered, and the fatigue is relieved. The device for relieving the fatigue comprises a compartment cover, a control system, a hydraulic system, a power amplifier, guide rails, a bed body, a loudspeaker, a control panel, a lighting system, a compartment body and the like, the totally closed, full automation and noiseless design is adopted, multiple inputting modes are built in infrasonic wave inputting signals, and the device is suitable for people at all ages with different needs. The method for relieving the fatigue is good in effect, free of sequelae and suitable for most groups, and the device is simple in structure, stable, safe, comfortable and reliable.