Fiber bragg grating vibration sensor and detection device thereof

Abstract

The invention relates to a fiber grating vibration sensor and a detection device thereof. Fiber Bragg grating vibration sensor, comprising a fiber grating, an optical circulator, an intensity modulator and a fiber Mach-Zehnder interference structure, the fiber Bragg grating, circulator, intensity modulator and fiber-optic Mach-Zehnder structure are sequentially fused with optical fibers . The vibration detection device includes the fiber grating vibration sensor and includes a broadband light source, a microwave signal generator, a photodetector and a spectrum analyzer. The broadband light source and the photodetector are connected to both ends of the vibration sensor respectively, and the microwave signal generator is the intensity The modulator provides microwave modulation signals, and the fiber grating sensing unit composed of fiber grating, circulator and intensity modulator in the fiber grating vibration sensor is fixed on the vibration source to be detected. The invention has the advantages of simple and firm structure, strong operability, high sensitivity, strong anti-electromagnetic interference capability, large measurement dynamic range, high measurement precision, and remote measurement.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an optical fiber grating vibration sensor and a detection device based on a microwave domain Mach-Zehnder interference structure. Background technique [0002] Since the appearance of optical fiber, with the continuous development of optical fiber sensing technology in recent decades, optical fiber sensing technology has been researched and applied in almost all fields, especially in communication, engineering, physical parameter measurement and other fields. With the development of society, engineering has higher and higher requirements for real-time monitoring of the structural health of infrastructure, such as bridge vibration and stress monitoring, motor vibration monitoring, transformer vibration monitoring, etc. Traditional mechanical and electromagnetic sensing The method has no way to meet the actual needs. As a high-quality optical transmission medium, optical fiber...

AI Technical Summary

Problems solved by technology

However, since the phase information of the optical signal is easily affected by the jitter of the external environment, the reliability of the demodulation results of the fiber grating by the Mach-Zehnder interferometer in the traditional optical domain is often not high.

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