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Proceedings Paper

Theoretic analysis on the maximum measurable velocity of a self-mixing laser diode velocimeter
Author(s): Zhao-yun Zhang; Yang Gao; Xing-hai Zhao; Xiang Zhao
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Paper Abstract

Laser output power and frequency are modulated when the optical beam is back-scattered into the active cavity. By signal processing, the Doppler frequency can be acquired, and the target's velocity can be calculated. Based on these properties, an interferometry velocity sensor can be designed. In order to know whether the self-mixing laser diode velocimeter is suitable for high speed (km/s) scene, the self-mixing laser diode velocimeter's maximum measurable velocity (MMV) is analyzed. Based on the three-mirror cavity model, relations of the laser output power's frequency fluctuations and Doppler frequency are acquired. External optical feedback is regarded as laser's small-signal modulation by the Doppler frequency. From rate equations of the carrier density and the photon density, following conclusions is acquired: self-mixing laser diode velocimeter's MMV is restricted by laser's relaxation resonant frequency in principle; self-mixing laser diode velocimeter's MMV goes up to kilometers per second theoretically. The result is available to use the self-mixing technique to develop high performance, small overall dimensions and low cast instruments to measure high speed.

Paper Details

Date Published: 28 August 2009
PDF: 6 pages
Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73821M (28 August 2009); doi: 10.1117/12.832329
Show Author Affiliations
Zhao-yun Zhang, Institute of Electronic Engineering (China)
China Academy of Engineering Physics (China)
Yang Gao, Institute of Electronic Engineering (China)
Chongqing Univ. (China)
Xing-hai Zhao, Institute of Electronic Engineering (China)
Xiang Zhao, Institute of Electronic Engineering (China)
China Academy of Engineering Physics (China)


Published in SPIE Proceedings Vol. 7382:
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging
Farzin Amzajerdian; Chun-qing Gao; Tian-yu Xie, Editor(s)

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