Differential laser Doppler velocimeter using polarized laser beams

Sadao Fujimura; Takahiko Oshige

doi:10.1117/12.135297

1 January 1992 Differential laser Doppler velocimeter using polarized laser beams

Sadao Fujimura, Takahiko Oshige

Proceedings Volume 1553, Laser Interferometry IV: Computer-Aided Interferometry; (1992) https://doi.org/10.1117/12.135297
Event: San Diego, '91, 1991, San Diego, CA, United States

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.

Citation Download Citation

Sadao Fujimura and Takahiko Oshige "Differential laser Doppler velocimeter using polarized laser beams", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); https://doi.org/10.1117/12.135297

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KEYWORDS

Doppler effect

Signal detection

Velocity measurements

Laser Doppler velocimetry

Sensors

Beam splitters

Laser interferometry

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