Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1988-10-14
1990-05-15
Tarcza, Thomas H.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
356 28, G01P 336
Patent
active
049252976
ABSTRACT:
A three-dimensional laser Doppler velocimeter (10) has laser optics (12) for a first channel positioned to create a probe volume (18) in space, and laser optics (14) and (16) for second and third channels, respectively, positioned to create entirely overlapping probe volumes (20) in space. The probe volumes (18) and (20) overlap partially in space. Photodetector (22) is positioned to receive light scattered by a particle present in the probe volume (18), while photodetectors (24) and (26)are positioned to receive light scattered by a particle present in the probe volume (20). The photodetector (22) for the first channel is directly connected to provide a first channel analog signal (23) to frequency measuring circuits 28. The first channel is therefore a primary channel for the system. Photodetectors (24) and (26) are respectively connected through a second channel analog signal attenuator (42) to frequency measuring circuits (44) and through a third channel analog signal attenuator (50) to frequency measuring circuits (52). The second and third channels are secondary channels, with the second and third channels analog signal attenuators (42) and (50) controlled by the first channel measurement burst signal (35) on line (36). The second and third channels analog signal attenuators (42) and (50) attenuate the second and third channels analog signals only when the measurement burst signal (35) is false.
REFERENCES:
patent: 3743420 (1973-07-01), Iten et al.
patent: 4506979 (1985-03-01), Rogers
patent: 4664513 (1987-05-01), Watt et al.
Brekke Darrell G.
Glenn Charles E. B.
Manning John R.
Tarcza Thomas H.
The United States of America as represented by the Administrator
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