Laser doppler velocimeter

Details Laser doppler velocimeter Laser doppler velocimeter

1991-10-30

1993-02-16

Hellner, Mark

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356345, G01P 336, G01B 902

Patent

active

051875381

ABSTRACT:
A laser Doppler velocimeter which has an optical system using a semiconductor laser as a light source for receiving a scattered light by reflection from natural particulate in fluid to be measured passing interference fringes formed in a region to be measured by a semiconductor optical detector, and a signal processor having a converter for converting a Doppler signal from the semiconductor optical detector to a predetermined waveform (e.g., a square wave) according to at least two different threshold values, and an arithmetic unit for comparing the processed signals from each other to judge that the scattered signal is from one natural particulate or not (i.e., the propriety of its measuring accuracy) and to calculate the velocity of the fluid to be measured according to the judged result and the process result of the converter from the period of the square wave when judging "a normal measurement".

REFERENCES:
patent: 4311383 (1982-01-01), Ohtsubo
patent: 4974960 (1990-12-01), Dopheide et al.
patent: 4997272 (1991-03-01), Dopheide et al.
patent: 5054913 (1991-10-01), Ishikawa et al.

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