A fiber grating acceleration sensor with temperature compensation and its measurement method

Abstract

The invention provides a miniaturized fiber grating acceleration sensor with temperature compensation and its measurement method, which includes an upper shell, a lower shell, and a mass block between the upper and lower shells. Two rectangular elastic plates are arranged symmetrically on both sides of the mass block. There is a threaded hole in the middle of the block for connecting with the screw, and the bottom of the screw is connected to the elastic body. The elastic body includes cylindrical outer walls on both sides. A pair of pillars and a connecting block in the middle are arranged between the outer cylindrical walls. Both the pillar and the connection block are connected by hinges, the bottom of the screw rod passes through the connection block in the middle of the elastic body, the lower surface of the two pillars of the elastic body is provided with fiber optic grooves, and the bottom of the outer wall on both sides of the elastic body is provided with fiber optic grooves. There are two optical fibers. The sensor of the invention has the advantages of simple structure, small volume and high frequency; it has the advantages of small volume, high temperature resistance, working in a small space, realizing distributed detection and the like.

Description

technical field [0001] The invention belongs to the technical field of mechanical vibration measurement, in particular to a miniaturized fiber grating acceleration sensor with temperature compensation and a measurement method thereof. Background technique [0002] In recent years, fiber grating sensors have been widely developed and used at home and abroad, and their vibration measurement in the fields of national defense and national economy has become more and more extensive. Vibration sensors can characterize vibration signals with vibration acceleration, amplitude, and frequency. Existing vibration detection methods can be divided into electrical detection methods and optical detection methods according to the physical way of detecting vibration signals. The electrical detection method uses an electrical acceleration sensor, which uses a mass block, an elastic element, and a conversion element to sense vibration acceleration. This type of acceleration is mainly capacit...

AI Technical Summary

Problems solved by technology

Although the acceleration sensor with elastic beams, diaphragm springs and other structures as elastic elements can meet the requirements of low-frequency vibration; but the dynamic characteristics of this structure are affected by the stiffness of the structure, and the overall size of the structure is too large, which is not conducive to installation in small spaces. Implement vibration detection; in addition, most fiber grating acceleration sensors are only used to detect vibration and cannot realize simultaneous measurement of temperature and vibration

Images