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Proceedings Paper

Differential laser Doppler velocimeter using polarized laser beams
Author(s): Sadao Fujimura; Takahiko Oshige
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Paper Abstract

A position-measurement type of laser Doppler velocimeter is proposed. While many conventional LDV systems get information on velocity from the frequency of a Doppler signal, the system proposed in this paper obtains that from the instantaneous phase change. The phase of the Doppler signal is obtained from two signals proportional to sine and cosine of the position of a target, respectively. We get the two signals by using linearly polarized beams. Differential configuration of the measurement system enables us to remove pedestal components of detected signals. This system makes it possible to measure rapidly-changing velocity including direction change and zero velocity without any special devices.

Paper Details

Date Published: 1 January 1992
PDF: 8 pages
Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); doi: 10.1117/12.135297
Show Author Affiliations
Sadao Fujimura, Univ. of Tokyo (Japan)
Takahiko Oshige, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 1553:
Laser Interferometry IV: Computer-Aided Interferometry
Ryszard J. Pryputniewicz, Editor(s)

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