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Proceedings Paper

Inclination angle measurement of inertial platform based on LD-PSD
Author(s): Yin-guo Huang; Yu-chi Lin; Le Song; Xin Zhou
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Paper Abstract

Aiming at the limitations of the existing measuring technology, the paper presents a novel method for inclination angle measurement of inertial platform based on LD-PSD. The proposed scheme adopts autocollimation principle, using a laser diode(LD) as the light source and a two-dimensional position sensitive detector(PSD) for laser spot sensing. The light from LD is first converted to parallel light, and then projected onto a reflector on the inertial platform. The returned light falls on PSD at last. When the inclination angle of inertial platform moves, the laser spot on PSD changes correspondingly, providing 2-D inclination angle information of inertial platform. According to its working principle, a mathematical model of inclination angle measurement is established. High accuracy and long stable working time are the key indexes to implement the measurement system. Considering several main factors including the uniformity and size of laser beam, laser beam excursion, temperature and laser interference etc, which influence the precision and stability, improving methods are put forward. The measurement system, consisting of optical structure, PSD signal processing and inclination angle calculation, is introduced in detail. Finally, calibration and experiment are carried out to verify its performance. The result of the experiment shows that the resolution of the measurement system reaches 0.05" with a working rang of ±600" and the indication error is less than ±0.5" within 24 hours. The measurement system can exactly and reliably measure the inclination angle of inertial platform and monitor the drift of inclination angle for a long time.

Paper Details

Date Published: 7 January 2008
PDF: 6 pages
Proc. SPIE 6824, Semiconductor Lasers and Applications III, 68240L (7 January 2008); doi: 10.1117/12.755034
Show Author Affiliations
Yin-guo Huang, Tianjin Univ. (China)
Yu-chi Lin, Tianjin Univ. (China)
Le Song, Tianjin Univ. (China)
Xin Zhou, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 6824:
Semiconductor Lasers and Applications III
Lianghui Chen; Hiroyuki Suzuki; Paul T. Rudy; Ninghua Zhu, Editor(s)

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