High Sensitive Fiber Bragg Grating Acceleration Sensor Based on Rigid Hinge

Abstract

The invention discloses a high-sensitivity optical fiber grating acceleration sensor based on a rigid hinge, which includes an optical fiber, a package case, a base fixed on the inner bottom surface of the package case, a pin shaft fixed on the base, two swing rods and a mass block , one end of the swing rod is hinged with the pin shaft and the base to swing up and down to form a rigid hinge, and the other end is fixed to the mass block, and the two swing rods and the mass block are symmetrical about the center line of the pin shaft; when a single optical fiber is used, the optical fiber is fixed horizontally at At the highest point or the lowest point of the two mass blocks, when using two optical fibers, the two optical fibers are fixed horizontally on the highest point and the lowest point of the two mass blocks respectively; the part between the two fixed points on the optical fiber is the optical fiber working There are gratings on both sides of the centerline of the pin shaft on the working section of the optical fiber. The working section of the optical fiber has a certain prestress and does not contact other parts. demodulator. The sensor enables precise measurement of tiny vibrations.

Description

technical field [0001] The invention belongs to the technical field of fiber grating sensing, and in particular relates to a high-sensitivity fiber grating acceleration sensor based on a rigid hinge. Background technique [0002] In recent years, the manufacturing of mechanical parts tends to develop more and more in the direction of precision, miniaturization and light weight, and precision machining technology occupies an important position in the process of precision parts manufacturing. Precision machining technology refers to the size and shape accuracy of processing. Sub-micron level, the roughness R of the machined surface a A general term for technologies that reach the nanoscale. In the actual processing process, micro-vibration is almost difficult to avoid. If the vibration direction is consistent with the error-sensitive direction, it will cause large processing errors, increase the roughness of the part surface, and even affect the normal operation of the machin...

AI Technical Summary

Problems solved by technology

In the actual processing process, micro-vibration is almost difficult to avoid. If the vibration direction is consistent with the error-sensitive direction, it will cause large processing errors, increase the roughness of the part surface, and even affect the normal operation of the machine. Therefore, it is necessary to set the acceleration Sensors detect micro-vibrations during actual machining

[0003] Although fiber gratings have outstanding advantages such as small size, light weight, no electromagnetic interference, and distributed measurement, the current fiber grating acceleration sensors basically use cantilever beams or flexible hinges as elastic bodies and mass blocks as The method of acceleration carrier, due to the principle of continuity of the elastic body, the surrounding material must have constraints on the deformed material, which actually reduces the total axial deformation of the fiber grating. The sensor designed in this way has low sensitivity and cannot It can measure the machining error caused by micro-vibration very well in real time

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