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Optical Engineering

Study on reducing the precision loss of a portable probe in large-scale measurements
Author(s): Bin Xue; Jigui Zhu; Yongjie Ren; Linghui Yang; Jun Wu; Zhexu Liu
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Paper Abstract

The traditional measurement method for a hand-held probe with two sensors in large-scale measurements magnifies the uncertainty significantly when the distance between the tip and the nearest sensor is increased in order to touch the measurement points in the shadowed zone. To reduce the precision loss in that case, we propose a new method that only utilizes the colinear characteristic of the sensors on our newly designed probe. Hence, the principle of intersection can be used to determine the coordinate of the measurement point by holding the probe to touch the point in two or more different directions. This method is helpful to keep a low uncertainty in the case where increasing the distance between the tip and the nearest sensor is necessary. Correspondingly, the algorithms used to make the probe work its best, as well as the detailed derivations, are given. An experiment is then shown to verify the efficacy of the new design and the proposed method. The results indicate that the new design and the new method can reduce the precision loss remarkably in the case where the distance between the tip and the nearest sensor has to be increased.

Paper Details

Date Published: 18 February 2014
PDF: 11 pages
Opt. Eng. 53(2) 024106 doi: 10.1117/1.OE.53.2.024106
Published in: Optical Engineering Volume 53, Issue 2
Show Author Affiliations
Bin Xue, Tianjin Univ. (China)
Jigui Zhu, Tianjin Univ. (China)
Yongjie Ren, Tianjin Univ. (China)
Linghui Yang, Tianjin Univ. (China)
Jun Wu, Tianjin Univ. (China)
Zhexu Liu, Tianjin Univ. (China)

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