Fiber glass motion transducer

A technology of displacement sensor and optical fiber, which is applied in the direction of instruments, optical devices, measuring devices, etc., can solve the problems of low precision and sensitivity, small range, poor stability, etc., and achieve strong anti-interference ability, large range and high precision.

Inactive Publication Date: 2005-01-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0009] In order to overcome the shortcomings of small measuring range, low precision and sensitivity, and poor stability in the prior art, the present invention proposes an optical fiber displacement sensor that is applicable to strong electromagnetic interference and nuclear radiation fields and can realize remote and high-speed measurement

Method used

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Embodiment Construction

[0018] This embodiment is mainly composed of a light source 1, a lens 3, a main grating 5, an indicating grating 6, a photoelectric conversion and direction identification circuit instrument 10, a self-focusing lens 13, a multimode optical fiber 11 and a box body 2. During specific implementation:

[0019] The casing 2 made of metal is square, and a cover plate 12 is arranged at one end. The bottom of the box body 2 has through holes for placing the light source 1 along both sides of the center line, and there are displacement grooves 14 on the side walls, and the displacement grooves on one side are through holes, and the other side is a blind hole; There are also through holes for placing multimode optical fibers 11 on both sides of the center line. The cover plate 12 is connected with the box body 2 by screws.

[0020] A light source 1 is formed by illuminating light-emitting diodes with a wavelength of 940 nm, and is glued and fixed on the bottom of the box body 2 . An o...

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Abstract

Self-focusing lens is added behind indication grating of pattern displacement sensor. The self-focusing lens is connected to multimode optical fiber. Remote end of the said optical fiber is connected to instrument of photovoltaic conversion and differentiating direction circuit. Using self-focusing lens and multimode optical fiber picks up displacement signal of Moire fringe behind main grating and indication grating. The said displacement signal is transferred to remote end for carrying signal processing further. Comparing with prior art, the invention possesses features of lightweight, small size, large range, high precision and wide communication frequency band. The sensor is applicable to site, where there are strong electromagnetic interference and nuclear radiation, and capable of remote measuring.

Description

(1) Technical field: [0001] The invention relates to an optical fiber displacement sensor, (two) background technology: [0002] The grating displacement sensor in the prior art can be used as a displacement sensor for large-scale (above 10m) and high-precision (below 1 μm) measurement. [0003] In the "linear scales encoder" of "HEIDENHAIN CORPORATION", the manual of "long grating displacement sensor" produced by Chengdu Keaoda Photoelectric Technology Co., Ltd., Institute of Optoelectronic Technology, Chinese Academy of Sciences, and Cao Wen's "Sensing Technology", proposed The structural feature of the grating displacement sensor is that the LED is used as the lighting source, and the photodiode is used to directly receive the moiré fringe light intensity signal behind the grating, and the weak electric signal converted by the photodiode is amplified and sent to the subsequent circuit processing unit. Therefore, when this type of displacement sensor is in a strong electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02
Inventor 奥成喜陈长乐
Owner NORTHWESTERN POLYTECHNICAL UNIV
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