Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1979-04-20
1981-04-21
Bauer, Edward S.
Optics: measuring and testing
By particle light scattering
With photocell detection
356 285, 356342, G01B 902
Patent
active
042630029
ABSTRACT:
A diagnostic apparatus and method for measuring motion of flowing solid and fluid particles that utilizes a differential doppler system and makes measurements parallel to the optical axis of the system. The system includes a laser generating a light beam directed toward a light beam splitter. The splitter separates the light beams into a plurality of beams that are focused in a crossing and focusing area. Receiving optics aligned with a photodetector sense light scattered by particles moving in the focusing area. The photodetector converts the light signals to electrical signals. A signal mixer coupled to the photodetectors operates to produce a difference electrical signal established by the difference between the frequencies of the electrical signals produced by the photodetector. The difference electrical signal is converted with signal processors to a voltage proportional to the velocity of particles moving through the focusing area. In one form, the signal mixer operates to produce a difference signal and a sum signal. The difference signal is received by a first signal processor to convert the difference signals to a voltage proportional to velocity u.sub.y of particles moving through the focusing area. A second signal processor receives a sum signal and converts the sum signal to a voltage proportional to the velocity u.sub.x of particles moving through the focusing area.
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Bauer Edward S.
Koren Matthew W.
TSI Incorporated
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