Phase sensitivity calibration method based on phase generated carrier technology

A phase sensitivity calibration method based on a phase generated carrier (PGC) technology, comprising:

• first adding an additional calibration signal with a phase of known magnitude through a phase modulator, demodulating the signal through PGC algorithm, and obtaining a demodulated output value corresponding to a unit phase in the algorithm, wherein
• the method specifically comprises the following steps:
• step 1:
• obtaining a response relationship between a calibration signal frequency and a carrier frequency based on a performance parameter of the phase modulator of a PGC demodulation sensing system;
• step 2:
• obtaining a corresponding carrier modulation signal amplitude based on a carrier modulation depth C of the PGC demodulation sensing system required by the PGC technology, and obtaining, based on the response relationship obtained in step 1, a signal amplitude U required for the calibration signal to apply a rated phase φ;
• step 3:
• applying the calibration signal described in step 2 to the phase modulator of the PGC demodulation sensing system, and demodulating a amplitude V of a corresponding signal through the PGC technology;
• and
• step 4:
• comparing the phase φ generated by the calibration signal with the signal amplitude V output by the algorithm, and obtaining a demodulated output value corresponding to a unit phase in the algorithm, that is, a phase sensitivity V/φ of a demodulator.