Fiber Bragg Grating Acceleration Sensor with Combination Structure of Diaphragm and Rhombus and Measurement Method

Abstract

The invention provides an optical fiber grating acceleration sensor with a diaphragm and rhombus combined structure. The optical fiber grating acceleration sensor comprises an elastic diaphragm, and afirst bolt sequentially penetrates through a center threaded hole of a mass block, a gasket and a center hole of the elastic diaphragm and then is fixedly connected with a nut; the gasket is used forisolating the mass block from the elastic diaphragm, the tail end of the first bolt is connected with a force transmission piece, and the other end of the force transmission piece is connected with avertex of a rhombic component through a pin; the diagonal vertex corresponding to the vertex of the rhombic component is connected with a pressing block through a pin, the pressing block is fixed tothe inner bottom surface of a shell, and the shell is composed of an upper shell body and a lower shell body; the edge of the elastic diaphragm is fixed in a clamping groove between the upper shell body and the lower shell body, two optical fibers are fixed to two sets of diagonal vertexes of the rhombic component by using certain pre-tightening force without mutual interference, and suspension parts of the two optical fibers are both provided with an optical fiber grating. By means of the sensor, the interference of transverse vibration on longitudinal acceleration measurement can be reduced,and the sensitivity is doubled while high inherent frequency is kept.

Description

technical field [0001] The invention belongs to the technical field of mechanical vibration measurement, and in particular relates to a fiber grating acceleration sensor with a combined structure of a diaphragm and a rhombus and a measurement method. Background technique [0002] Mechanical vibration refers to the reciprocating elastic motion of a machine or structure near its static equilibrium position. The internal cause of vibration is that the machine or structure has the ability to store kinetic energy and potential energy during vibration, and to release kinetic energy and potential energy and convert kinetic energy and potential energy to each other; the external cause is due to external excitation or action on the system. Classified according to different situations, the vibration system can be roughly divided into linear vibration and nonlinear vibration; deterministic vibration and random vibration; free vibration and forced vibration; periodic vibration and non-p...

AI Technical Summary

Problems solved by technology

The mechanical method has strong anti-interference ability; but the frequency range, dynamic range and linear range are narrow, and the test will produce a certain load effect on the measured object, which will affect the test results and poor measurement accuracy.

Images