Laser apparatus for measuring the velocity of a fluid
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United States of America Patent
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Dec 7, 1993
Grant Date -
N/A
app pub date -
Dec 4, 1991
filing date -
Dec 4, 1990
priority date (Note) -
Expired
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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).
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