Multi-dimensional laser Doppler velocimeter

Details Multi-dimensional laser Doppler velocimeter Multi-dimensional laser Doppler velocimeter

1989-11-13

1991-02-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 285, G01P 336

Patent

active

049907913

ABSTRACT:
A reference beam type optical laser Doppler velocimeter for emitting two or more probe beams to an object to be measured at a predetermined angle to multi-dimensionally measure a velocity and/or a displacement vector of the object due to Doppler shifts of beams reflected by the object. This velocimeter includes a frequency shifting means for dividing a laser beam from a single light source into two or more beams, and shifting optical frequencies of the beams each by a predetermined shift amount, a photodetecting means for receiving the reflected and reference beams to obtain a detection current, and a bandpass filter for causing the detection current to pass therethrough to obtain a required signal.

REFERENCES:
patent: 3897152 (1975-07-01), Farmer et al.
patent: 3930733 (1976-06-01), Holly
patent: 4397550 (1983-08-01), Matsuda et al.
patent: 4466738 (1984-08-01), Huang et al.
patent: 4470696 (1984-09-01), Ballard
patent: 4669876 (1987-06-01), Dopheide

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