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.
CN1563883AInactive Publication Date: 2005-01-12NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2005-01-12
Estimated Expiration
Not applicable · inactive patent

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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.
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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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