Abstract
Compared with ordinary gratings, phase-shifted fiber gratings have better ultrasonic response sensitivity and higher upper response frequency. The application of phase-shifted fiber gratings in ultrasonic signal detection has gradually become a research hotspot. This paper mainly introduces the demodulation principle of tunable laser power scanning and wavelength feedback control techniques such as wavelength stabilization, frequency stabilization and laser tracking. Most of the existing demodulation techniques are only suitable for single optical channel, and the demodulation frequency is low. The development direction of fiber Bragg grating demodulation technology is multi-channel synchronous stable high frequency demodulation.
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