Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1984-09-10
1987-03-24
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
356129, 356432, 356436, G01P 336, G01N 2141
Patent
active
046521208
ABSTRACT:
A method of measuring the velocity of a fluid by nonintrusive means comprises passing a pulsed pump laser beam through the fluid wherein the fluid contains a constituent absorbing the wavelength of the laser so that a temperature gradient, and therefore an index of refraction gradient, occurs in the laser beam path; and a probe laser beam is passed transversely to the pump laser beam and is deflected by the heated portion of the fluid by an amount which is proportional to the concentration of the absorbing constituent and inversely proportional to the velocity of the fluid; measuring the beam deflection and calculating from that the fluid velocity, if the concentration of the absorbing constituent is known, or calculating the relative velocity if the concentration of the absorbing constituent is constant. The apparatus is similar to that used for photothermal deflection spectroscopy and involves a pair of crossed laser beams, one for pumping the medium and one for probing the medium, a probe beam deflection sensor, and electronic circuitry for analyzing the measured deflection signal.
REFERENCES:
patent: 3807228 (1974-04-01), Matzuk
patent: 3950104 (1976-04-01), Munk
W. Herrman et al, IBM Tech. Discl. Bul., vol. 21, #10, Mar. 1979.
W. Herrman et al, Infrared Physics, Aug. 1979, p. 455.
W. B. Jackson et al, Applied Optics, vol. 20, #8, Apr. 15, 1981.
Buczinski Stephen C.
General Motors Corporation
Hill Warren D.
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