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Sensors 2009, 9(12), 10411-10422; doi:10.3390/s91210411

Article

Novel Absolute Displacement Sensor with Wide Range Based on Malus Law

Wei Li, Xiaoping Lu and Yonggang Lin*

The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China

* Author to whom correspondence should be addressed.

Received: 16 October 2009; in revised form: 5 November 2009 / Accepted: 7 December 2009 / Published: 21 December 2009

(This article belongs to the Section Physical Sensors)

Download PDF Full-Text [926 KB, uploaded 21 December 2009 16:42 CET]

Abstract: The paper presents a novel wide range absolute displacement sensor based on polarized light detection principle. The sensor comprises of two sets of polarized light detecting systems which are coupled by pulleys. The inherent disadvantage in optic system like light source intensity drift is solved and absolute measurement with wide-range is achieved. A prototype and the relevant test bed have been built. The test results are in good agreement with expectation. Its measurement range is 540 mm, and its linearity is better than 0.05%.

Keywords: displacement sensor; wide range; polarized light; light source drift; absolute measurement

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