A temperature and vibration decoupled measurement system and method based on fiber optic sensors

Abstract

The application discloses a temperature and vibration decoupling measurement system based on an optical fiber sensor, which comprises an optical circulator for transmitting adjustable detection light to an optical fiber Bragg grating and receiving a reflected light intensity signal; after light splitting through an optical coupler, the reflected light intensity signal is converted into a first electric signal and a second electric signal by two photoelectric detectors; an analog-digital converter carries out analog-digital conversion processing on the second electric signal to obtain a digital feedback electric signal; a field programmable gate array extracts a low-frequency component in the digital feedback electric signal, compares the low-frequency component with a preset target light intensity to obtain a light intensity deviation, calculates a wavelength adjustment amount through a closed-loop control algorithm, adjusts the wavelength of the detection light to realize preset working point locking of the optical fiber Bragg grating, obtains a temperature measurement value according to the adjusted detection light, extracts a high-frequency component of the first electric signal to obtain a vibration measurement value. The application improves the stability and reliability of measurement under a non-steady-state temperature environment.

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