Optical fiber sensing device

Abstract

The invention discloses an optical fiber sensing device. The device comprises a light source module, an acousto-optic modulator, a circulator, a sensing optical fiber, a coupler, a signal receiving module and a signal processing module, wherein the light source module is respectively connected with the acoustic optical modulator and the coupler; the optical splitter is used for generating detection light and local oscillation light and correspondingly transmitting the detection light and the local oscillation light to the acoustic optical modulator and the coupler; the acousto-optic modulator is connected with a first end of the circulator and is used for modulating the detection light and generating an optical pulse signal; the sensing optical fiber is connected with a second end of the circulator, and the optical pulse signal is transmitted to the sensing optical fiber through the second end of the circulator; the coupler is connected with a third end of the circulator, and the coupler is used for collecting backscattered light of the optical pulse signal in the sensing optical fiber and enabling the backscattered light to interfere with the local oscillation light; the signal receiving module is used for converting the interference light signal into an electric signal; and the signal processing module is used for processing data and acquiring vibration and temperature data. According to the sensing device, measurement accuracy is improved, and measurement cost is reduced.

Description

Technical field [0001] SENSORS embodiment of the invention relates particularly to a fiber optic sensing device. Background technique [0002] Different fiber nonlinear effect and light scattering-based mechanism, the birth of a plurality of different distributed optical fiber sensing technology, but the distributed optical fiber sensing technology can only achieve a limited amount of measured parameters. However, in the actual monitoring, external event is often caused by various factors as temperature, vibration, strain caused by the interaction, if only a single parameter to monitor events, can reflect only one factor, often lead to a higher error newspaper and false negatives, significant limitations, and often there is a problem with multiple intersecting sensitive parameters. This is not only difficult to achieve the alarm of potential accidents, but also difficult to promote engineering applications. [0003] Fusion conventional distributed optical fiber sensing system, su...

AI Technical Summary

Problems solved by technology

However, the measurement process of each parameter of this system interferes with each other, which will cause the problems of low measurement accuracy and high system cost.

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