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Proceedings Paper

Laser precision ranger based on beat-wave interferometry
Author(s): Tao Zhang; Yanhua Wu; Huang Weia
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Paper Abstract

This paper presents a laser precision ranger based on beat wave interferometry. A frequency-stabilized double longitudinal modes He-Ne laser with thermoregulation is used as the light source. The two beams of double longitudinal modes generated in the same resonator of the laser are naturally coaxial. They have a frequency difference of about 790MHz and a beat wavelength of 380mm. Their stability is the same as the laser, which is better than 10-7 in open air. The node of the beat wave is used as the sampling flag. An adaptive filter and a wavelet transform program are used to eliminate the noise and to improve the accuracy of node detection. The distance between the node and the measur ed point is measured with a double frequency interferometer, which is incorporated in the same optical system and has a resolution of 0.08&mgr;m. Experimental results indicate that the measuring range is 20m and the uncertainty 30&mgr;m /10m.

Paper Details

Date Published: 12 January 2009
PDF: 8 pages
Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 71332Q (12 January 2009); doi: 10.1117/12.810132
Show Author Affiliations
Tao Zhang, Sichuan Univ. (China)
Yanhua Wu, Sichuan Univ. (China)
Huang Weia, Sichuan Univ. (China)

Published in SPIE Proceedings Vol. 7133:
Fifth International Symposium on Instrumentation Science and Technology
Jiubin Tan; Xianfang Wen, Editor(s)

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