Wide range fiber grating displacement sensor capable of adjusting measuring range and precision

Abstract

The invention discloses a wide range fiber grating displacement sensor capable of adjusting a measuring range and precision, comprising fiber gratings, a spring and a rectangle housing; the adaptive position on the inner wall of the housing is fixedly connected to a support plate; the middle portion of the free end of the support plate is provided with a groove; the top end of the groove is provided with a sleeve sleeving a rotation shaft; an eccentric point of a gear passes through the middle portion of a rotation shaft and is integrated with the rotation shaft; the lower end of the gear is meshed with a spline fixed on a support rod on the lower part of the housing; one end of the spline is fixedly connected to the measurement rod; the measurement rod passes through and is projected out of the side wall of the adjacent housing and is in contact with a measured structure; the other end of the spline is connected to the side wall of the housing of the other end through a spring which is fixedly connected in parallel; and the two fiber gratings are symmetrically arranged on the upper surface and the lower surface of the support plate. The wide range fiber grating displacement sensor solves the problem that the current fiber grating displacement sensor is small in the measuring range, and is simple in operation, stable in performance, reliable, and high in accuracy and is the first choice for health monitoring of various construction structures.

Description

technical field [0001] The invention relates to a sensor, in particular to a large-range optical fiber grating displacement sensor with adjustable measuring range and precision, and belongs to the technical field of optical fiber sensing. Background technique [0002] The sensor with fiber grating as the basic test unit has many advantages such as small size, light weight, corrosion resistance, anti-electromagnetic interference, etc., and has been widely used in the health monitoring of engineering structures. Among them, the application and research of fiber grating sensing technology are the most in the two aspects of strain and temperature, while the research and application of displacement monitoring are relatively few. Most of the fiber grating displacement sensors are designed based on the cantilever beam structure. The structure is to paste the fiber grating on the surface of the cantilever beam. Causes the shift of the reflection wavelength of the fiber grating. Th...

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Problems solved by technology

[0003] The present invention is proposed in response to the above problems, and the purpose is to provide a large-range fiber grating displacement sensor with adjustable range and precision that solves the problem that the existing fiber grating displacement sensor has a small measurement range and cannot change the range and accuracy, and achieves a simple structure. , stable performance, reliable, high precision, suitable for the purpose of health monitoring of various engineering structures

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