Distributed optical fiber vibration sensing system based on polarization beam splitting detection and sensing method
A technology of vibration sensing system and distributed optical fiber, which is applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of limited sensitivity and poor linearity of the system, and achieve convenient signal processing and simple structure Effect
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Embodiment 1
[0035] see figure 1 , the invention discloses a distributed optical fiber vibration sensing system based on polarization beam splitting detection, which includes a sensing system and a detection and control system.
[0036] 【Induction system】
[0037] The sensing system is used to sense external vibration events; it includes a light source, a pulse modulator, a circulator, a polarization beam splitter, a first amplifier, a second amplifier, a first filter, and a second filter.
[0038] The light source is used to emit continuous light. In this embodiment, the light source includes a connected laser driver and a laser; the laser driver is connected to a controller of the inspection and control system, receives a control signal from the controller, and thus drives the laser to emit laser light. . The pulse modulator is used to modulate the continuous light emitted by the light source into pulsed light; the circulator is used to inject the pulsed light into the sensing optical ...
Embodiment 2
[0059] In this embodiment, the sensing method of the above-mentioned distributed optical fiber vibration sensing system based on polarization beam splitting detection, the method includes the following steps:
[0060] The sensing step is to sense external vibration events; including:
[0061] (11) The light source emits continuous light;
[0062] (12) The pulse modulator modulates the continuous light emitted by the light source into pulsed light;
[0063] (13) The circulator injects pulsed light into the sensing optical cable;
[0064] (14) The polarizing beam splitter splits the backscattered light of the sensing cable output by the circulator into two beams with orthogonal polarization states of linearly polarized light;
[0065] (15) The first amplifier and the second amplifier amplify the two beams of linearly polarized light signals; the first filter and the second filter respectively filter the above-mentioned amplified signals;
[0066] The prosecution step is to de...
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