Fiber Bragg grating two-dimensional vibration sensor with temperature compensation

Abstract

The invention discloses a fiber Bragg grating two-dimensional vibration sensor with temperature compensation, which comprises an upper end cover, a T-shaped beam, a lower end cover and four fiber Bragg gratings, wherein the T-shaped beam comprises a cross beam and a vertical beam, the third fiber Bragg grating and the fourth fiber Bragg grating along the direction of the cross beam are connected through the first fiber Bragg grating arranged along the direction of the vertical beam, vibration acceleration parameters in the two mutually vertical directions can be measured in real time, temperature compensation is carried out on the first fiber Bragg grating through the second fiber Bragg grating, the T-shaped beam is adopted to act as an elastic body to realize vibration measurement, and the resonant frequency and the sensitivity of the sensor are effectively improved. Meanwhile, a pretightening force of the first fiber Bragg grating is changed through adjusting a pretightening screw, and the vibration measurement range along the direction of the vertical beam can be enlarged. According to the invention, the fiber Bragg grating two-dimensional vibration sensor transmits optical signals through optical fibers and has a higher anti-electromagnetic interference ability. In addition, multi-parameter distributed vibration dynamic measurement can be realized through connecting a plurality of the fiber Bragg grating two-dimensional vibration sensors with temperature compensation in series.

Description

technical field [0001] The invention belongs to the high and low frequency vibration testing technology in the field of machinery industry, and in particular relates to a fiber grating two-dimensional vibration sensor with temperature compensation. Background technique [0002] In the field of machinery industry, vibration is one of the main signs of failure. Therefore, it is particularly important to detect vibration in real time to ensure the healthy and stable operation of mechanical equipment and other industrial equipment. At present, the commonly used vibration detection mainly uses electric vibration sensors, but the work of the measured body is harsh, susceptible to electromagnetic interference, and cannot be measured accurately, and there are also great safety hazards for some flammable and explosive bad working conditions . [0003] Fiber Bragg Grating (FBG) has the advantages of small size, anti-electromagnetic interference, dynamic distributed measurement and lo...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low measurement sensitivity and small measurable frequency band range of the existing vibration testing technology, the present invention provides a fiber grating two-dimensional vibration sensor with temperature compensation, which improves the vibration measurement sensitivity and expands the measurement frequency band range

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