1 January 1998 Holographic-field laser Doppler velocimeter with increased velocity measurement range for biomedical applications
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Abstract
In many applications of Laser Doppler Velocimetry object velocity varies with time within some more or less wide range. Large variations present a problem for signal processing. This difficulty may be reduced in the proposed new Laser Doppler Velocimeter which utilize the periodic polyharmonic spatial probe field. The probe field is formed by the holographic technique employing the periodic wavefront modulator and the field-forming hologram. By proper selection of the parameters of these components, the probe field with pronounced high-order spatial harmonic content is obtained. This results in the presence of several Doppler frequency harmonics in the output signal, for the single value of object velocity. One of these harmonics is used for velocity determination. The choice of a particular harmonic depends on how well it fits into the frequency range of the instrument's electronics. If the object velocity becomes too small or too large, some other Doppler frequency harmonic which now fits better into the instrument frequency range is used for further processing and velocity determination. Experimentally, the multi-harmonic probe field was obtained and the effect of its spatial structure on Doppler signal composition was studied.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sergei N. Khotiaintsev, J. Torres, Ernesto Pino, Vladmir N. Serkin, Victor M. Garcia, Vladimir Svirid, A. Protas, Leonid K. Yarovoi, "Holographic-field laser Doppler velocimeter with increased velocity measurement range for biomedical applications", Proc. SPIE 3199, Biomedical Systems and Technologies II, (1 January 1998); doi: 10.1117/12.301104; https://doi.org/10.1117/12.301104
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