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Optical Engineering

Rotational symmetric triangulation sensor based on an object space mirror
Author(s): Haibo Zhang; Yongjie Zhang; Wei Tao; Hui Zhao
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Paper Abstract

As novel sensors, rotational symmetric triangulation sensors (RSTSs) have broad application potential because of their robustness and accuracy. However, existing RSTSs have the disadvantages of complicated structure and high cost. The current paper presents a novel RSTS based on an object space mirror. The proposed sensor uses a cone mirror and a commercial camera, which significantly simplifies the structure and reduces its cost. Mathematical models are discussed to reveal the measurement range of the sensor and the relation between the displacement of the spot and the radius of the ring in the image. An improved image processing method is also introduced for a more efficient processing. Finally, two experimental systems with mirror angles at π/6 and π/4 are set up. Experimental results showed that the proposed sensor can achieve a comparable accuracy of 1.6 μm compared with that of existing methods, as well as a higher efficiency of image processing, while remaining at a low cost.

Paper Details

Date Published: 1 December 2011
PDF: 8 pages
Opt. Eng. 50(12) 124401 doi: 10.1117/1.3656748
Published in: Optical Engineering Volume 50, Issue 12
Show Author Affiliations
Haibo Zhang, Shanghai Jiao Tong Univ. (China)
Yongjie Zhang, Shanghai Jiao Tong Univ. (China)
Wei Tao, Shanghai Jiao Tong Univ. (China)
Hui Zhao, Shanghai Jiao Tong Univ. (China)

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