1 January 1992 Differential laser Doppler velocimeter using polarized laser beams
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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.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sadao Fujimura, Takahiko Oshige, "Differential laser Doppler velocimeter using polarized laser beams", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); doi: 10.1117/12.135297; https://doi.org/10.1117/12.135297
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