Non-contact measurement method of WMPS based on laser ranging sensors

SUN Qing; YANG Linghui

doi:10.7510/jgjs.issn.1001-3806.2016.05.011

Workshop measuring and positioning system (WMPS) may induce distortion of flexible object surface and there are hidden parts in large-scale space. In order to solve the problems, non-contact measurement method was proposed based on laser rangefinders. A measurement target was designed. Firstly, a measurement model of this method was established, and the target was simplified as the combination of several control points and a vector. Then, an attitude estimation algorithm was deduced from the geometry model of the transmitter, and the initial iteration value was estimated through unit quaternion method. Finally, calibration experiment of the target was conducted and the accuracy of the method was verified on a WMPS experimental platform developed by Tianjin University. The experimental results show that, distance measurement accuracy of the proposed method is better than 2.5mm and repeatability keeps within 1mm. This measurement method can extend the range of measurement and maintain relatively high accuracy of large-scale 3-D coordinate measurement.

Non-contact measurement method of WMPS based on laser ranging sensors

Corresponding author: YANG Linghui, icelinker@tju.edu.cn

1. State Key Laboratory of Preeision Measuring Technology and Instrument, Tianjin University, Tianjin 300072, China

Received Date: 2015-07-08

Accepted Date: 2015-10-22

Available Online: 2016-09-25

Abstract: Workshop measuring and positioning system (WMPS) may induce distortion of flexible object surface and there are hidden parts in large-scale space. In order to solve the problems, non-contact measurement method was proposed based on laser rangefinders. A measurement target was designed. Firstly, a measurement model of this method was established, and the target was simplified as the combination of several control points and a vector. Then, an attitude estimation algorithm was deduced from the geometry model of the transmitter, and the initial iteration value was estimated through unit quaternion method. Finally, calibration experiment of the target was conducted and the accuracy of the method was verified on a WMPS experimental platform developed by Tianjin University. The experimental results show that, distance measurement accuracy of the proposed method is better than 2.5mm and repeatability keeps within 1mm. This measurement method can extend the range of measurement and maintain relatively high accuracy of large-scale 3-D coordinate measurement.

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Reference (15)

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Non-contact measurement method of WMPS based on laser ranging sensors

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