Laser apparatus for measuring the velocity of a fluid

Details Laser apparatus for measuring the velocity of a fluid Laser apparatus for measuring the velocity of a fluid

1991-12-04

1993-12-07

McGraw, Vincent P.

Optics: measuring and testing

By particle light scattering

With photocell detection

25022727, 356 285, G01P 336, G01B 902

Patent

active

052687392

ABSTRACT:
In a laser apparatus for measuring the velocity of a fluid, a measurement laser light beam (M) fed into the fluid and scattered by a particle within the fluid is made to interfere with a reference laser light beam (R) to generate an interference signal based on the velocity of the particle; the apparatus comprises a low-coherence laser source (10) and interferometric means (11, 12) which split the light beam of the laser source (10) into the stated reference light beam (R) and measurement light beam (M), and cause the reference light beam (R) derived from the laser source (10) to interfere with the backscattered component resulting from the scattering of the measurement light beam (M).

REFERENCES:
patent: 4569588 (1986-02-01), Nishiwaki et al.
patent: 4627731 (1986-12-01), Waters et al.
patent: 4818071 (1989-04-01), Dyott
patent: 4892406 (1990-01-01), Waters
patent: 5012118 (1991-04-01), Preikschat et al.
Patent Abstracts of Japan; vol. 9, No. 54(P-340)(1777), Mar. 1985 and JP-A-59 192 967 (Mitsubishi Jukogyo K.K.) 1 (1984).

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