Dynamic phase demodulation and calibration method for high-reflectance optical fiber F-P chamber hydrophone

The invention provides a high-reflectance optical fiber F-P chamber transient speed variation phase high-speed linear demodulation method which comprises the following steps: measuring a relationship curve between high-reflectance multi-light optical fiber F-P chamber reversed detection interference output and scanning wavelength by using a wavelength scanning method; acquiring the primary physical chamber length of the F-P chamber; selecting central wavelength of three laser light sources according to the relationship curve between the F-P chamber reversed detection interference output and the scanning wavelength; exciting the F-P chamber through the three laser light sources; adjusting the output power of each laser light source; designing and manufacturing a static pressure experimental clamp with a laser wave pressure senor of the F-P chamber, making a static pressure loading experiment, and drawing corresponding relationship curves between the interference output and external static pressure under the excitation of the laser light sources; making a static characteristic calibration experiment by using a demodulator so as to obtain interference output variation phase of the F-P chamber and a linear relationship curve between the external static pressure and the interference output, and furthermore achieve linear calibration on the interference output variation phase of the F-P chamber.