Fiber Bragg grating vibration sensing measurement system and use method

Abstract

The invention discloses a fiber Bragg grating vibration sensing measurement system and a use method. An upper computer is connected with a tunable laser source, an acquisition card and a signal processing circuit, wherein a synchronous triggering output port of the tunable laser source is connected with a synchronous triggering input port of the acquisition card; laser output by the laser source is connected to one laser splitting port of a coupler; a combination port of the coupler is in series connection with n fiber Bragg gratings (FBGs) which are distributed at different test positions and have different working wavelength regions; and the other laser splitting port of the coupler is connected with a photoelectric detector and connected to the acquisition card through the signal processing circuit. During use, in a vibration-free initial state, the n FBGs are subjected to spectral scanning; the acquisition card synchronously acquires, selects and stores a set wavelength lambda(m) of the FBGs; and the acquisition card acquires reflection light power information of the vibrated FBGs to the lambda(m) according to an acquisition frequency set by the upper computer and sends the information to the upper computer for fast Fourier transformation (FFT) to obtain a vibration frequency of each point. The fiber Bragg grating vibration sensing measurement system can monitor a plurality of points, is high in measurement precision and high in anti-noise property, and can dynamically measure and demodulate high-frequency signals at high speed to instantly obtain a result.

Description

(1) Technical field [0001] The invention relates to the field of photoelectric detection, in particular to a fiber Bragg grating vibration sensing measurement system and a use method. (2) Background technology [0002] With the rapid development of science and technology, the position of sensor as one of the important fields of detection technology has become increasingly prominent, and it is developing in the direction of precision, sensitivity, adaptability, compactness and intelligence. The current optical communication technology is rapidly developing towards the direction of ultra-high-speed and large-capacity communication systems, and is gradually evolving into an all-optical network. In this situation, a new sensing technology, that is, fiber optic sensor, has emerged. Optical fiber sensors have advantages that traditional sensors cannot match: large capacity, high sensitivity, large bandwidth, light weight, small size, multi-purpose, small impact on the medium, ant...

AI Technical Summary

Problems solved by technology

[0005] However, there is no fiber Bragg grating vibration sensing and measurement system that multiplexes multiple fiber grating sensors at the same time and has a large test range, which limits the application of fiber Bragg gratings.

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