Method for measuring particle velocity using differential photod

Optics: measuring and testing – Velocity or velocity/height measuring – With light detector

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356 285, G01C 336

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active

047251360

ABSTRACT:
A method for measuring the velocity of a scatterer in a moving fluid by examining the spatial structure of the optical field on the detector of a Laser Doppler Velocimeter (LDV). The optical field after scattering from the laser beam is a traveling wave of a shape dependent on the detector optics alone. A pair of differential linear arrays are used to find the direction of velocity of the traveling wave and hence that of the scatterer. Furthermore, this method eliminates the Doppler pedestal which requires high pass filter in most of the conventional methods.

REFERENCES:
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patent: 3795447 (1974-03-01), Welch et al.
patent: 3830568 (1974-08-01), Allen
Blake, et al, "A Traversing Laser Velocimeter," Optics and Laser Tech., v 3, No. 4, 11/71-pp. 208-210.
Agrawal, et al, "Directional Pedestal-Free Laser Doppler Velocimetry Without Frequency Biasing, Part 1," Applied Optics, vol. 20, No. 9, 5/81-pp. 1553-1556.
Greated, C., "Velocity Measurement in Air with a Scattering Interferometer," ICIASF '71 Record, 6/71-pp. 152-156.
Oldengarm, et al, "Velocity Profile Measurements in a Liquid Film Flow Using the Laser Doppler Technique," J. of Physics E: Scientific Instr., vol. 8, 1975-pp. 203-205.
Wang, C. P., "Doppler Velocimeter Using Diffraction Grating and White Light" Applied Optics, vol. 13, No. 5, 5/74-pp. 1193-1195.
Ogiwara, H., "Laser Doppler Velocimeter with a Differential Photodiode Array," Applied Optics, vol. 18, No. 10, 5/79-pp. 1533-1538.

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