Modulation and demodulation method and device for optical fiber grating sensor based on phase shift signal modulation
A fiber grating, modulation and demodulation technology, applied in the direction of measuring devices, instruments, using wave/particle radiation, etc., can solve the problems of high hardware system requirements, difficult modulation, slow solution speed, etc., and achieve high signal-to-noise ratio, Strong anti-interference ability and small size effect
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[0052] The vibration information of a fiber grating sensor is tested in experiments. The distance between the two grating fibers is 24m, the sampling time is 22s, the laser pulse cycle and the frequency of the phase modulation pulse are 1MHz, and the pulse width of the phase modulation in one cycle is 160ns. The measuring device is as follows: figure 1 As shown, the measurement steps are:
[0053] Step 1. Turn on the laser light source 1 and let the tester walk around the optical fiber to which the fiber grating group 6 is fused, so that the fiber grating group 6 is induced to vibrate, and the light emitted by the laser light source 1 passes through the isolator 2, the optical switch 3 and the phase modulator in sequence 4. The signal generator 7 generates a high-speed pulse signal with a frequency of 1 MHz, which acts on the optical switch 3 to generate continuous laser pulses, and simultaneously provides a phase modulation of π / 2 to the phase modulator 4 to form a phase-modul...
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