Synchronous real-time scanning linear multichannel acquisition method for arc spectrum

The invention discloses a synchronous real-time scanning linear multichannel acquisition method for an arc spectrum. The method comprises steps of planar dynamic arc scanning, linear multi-channel acquisition and synchronous real-time triggering. To be specific, at the step of synchronous real-time triggering, when movement of a spectral acquisition platform is stopped, a spectral time-sequence detection and trigger circuit detects an arc state, and a trigger program determines the arc state. At the step of planar dynamic arc scanning, after the spectral time-sequence detection and trigger circuit completes the operation of triggering a spectrograph to collect spectral information of the arc in different instantaneous states, the trigger program is terminated; an output movement control signal is pulled up to a high level; a movement controller is started to control a motion motor of the spectral acquisition platform; and thus a linear array fiber is driven to move to a new acquisition position. And at the step of linear multi-channel acquisition, the operation is realized by using the linear array fiber; an incident port of the linear array fiber is arranged at an imaging optical screen of a spectral imaging system and is fixed at a fiber support of the spectral acquisition platform; and an emergent port of the linear array fiber is fixed at the spectrograph.