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Proceedings Paper

Long distance precision measurement with double modulation laser
Author(s): Jihua Fu; Zhongyu Wang
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Paper Abstract

A new laser sensor for long distance measurement with high accuracy is proposed in this paper. A stable double modulation laser in the sensor combines the pulse modulation with the phase modulation in single time-of-flight or distance measurement. The double modulation method can be used to solve two problems. The first is the measuring range and the measuring accuracy, the second is the response speed and the measuring accuracy, which are the possible keys to advance the measuring capabilities. The measuring accuracy can be improved by the phase-based modulation. Meanwhile, the measuring range can be extended to several kilometers due to the introduction of pulse features, which can also be used to solve the multiple-solution problem in the phase modulation system. A field programmable gate array is introduced into the demodulation part to acquire the distance information. Based on the measuring uncertainty analysis the accuracy of the distance sensor is discussed.

Paper Details

Date Published: 19 May 2006
PDF: 6 pages
Proc. SPIE 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 61500R (19 May 2006); doi: 10.1117/12.678095
Show Author Affiliations
Jihua Fu, Beihang Univ. (China)
Zhongyu Wang, Beihang Univ. (China)


Published in SPIE Proceedings Vol. 6150:
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Xun Hou; Jiahu Yuan; James C. Wyant; Hexin Wang; Sen Han, Editor(s)

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