Liquid damping optical fiber sensor for equipment vibration

Abstract

The invention provides a liquid damping optical fiber sensor for equipment vibration. Theliquid damping optical fiber sensor is characterized in that the liquid damping optical fiber sensor is mainly composed of a shell, a base, a main piston, a piston rod, a balance spring, an O-shaped sealing ring, an optical fiber piston and an FBG sensing optical fiber, wherein the shell is cylindrical, a U-shaped through hole is formed in the shell, the base is a circular plate, the piston rod is mounted in the middle, the interior of the shell is divided into a cavity 1# and a cavity 2# through the main piston, the cavity 1# and the cavity 2# are filled with a liquid, the FBG sensing optical fiber is arranged in the through hole of the piston rod, one end of the FBG sensing optical fiber is connected with the base, the other end of the FBG sensing optical fiber penetrates through the shell and is connected with an external monitoring element, the optical fiber piston is arranged in the through hole of the piston rod, the FBG sensing optical fiber is divided into two sections, and the two sections are provided with an FBG1 grating and an FBG2 grating with the same performance. According to the invention, equipment vibration is converted into longitudinal pressure difference of liquid through the main piston, interference of transverse vibration of equipment and influence of temperature are isolated, the structure is simple, and equipment vibration monitoring is accurately and effectively achieved.

Description

technical field [0001] The invention relates to the field of optical fiber vibration monitoring, in particular to the field of a liquid damping optical fiber sensor used for equipment vibration. Background technique [0002] With the development of optical fiber technology, the optical fiber sensor technology with optical fiber as the conduction medium is gradually applied to the vibration monitoring of equipment due to its high anti-interference, not affected by temperature, electromagnetic, etc. Among them, the FBG (Fiber BraggartGrating) grating will be compressed or stretched when it is under stress, and then the grating period Λ will change. According to the principle of optical fiber elastic-optic effect, the stress will also change. FBG is used at home and abroad to vibrate the equipment. For monitoring, many sensor technology solutions have been proposed. Among them, the main technical problem of vibration monitoring for FBG is the need to overcome the impact of vib...

AI Technical Summary

Problems solved by technology

[0004] In order to use FBG optical fiber technology to monitor the vibration signal of equipment and overcome the shortcomings of the above technical solutions, the present invention proposes a liquid damping optical fiber sensor for equipment vibration, which can effectively overcome the disadvantage that FBG optical fiber cannot feel vibration in a single direction during equipment vibration , it can also effectively prevent the FBG from being affected by the external environment during the vibration monitoring process, extract the vibration signal characteristics of the equipment, and thus characterize the reliability of the equipment operation

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