Laser doppler anemometer

Details Laser doppler anemometer Laser doppler anemometer

1974-03-22

1976-06-29

Corbin, John R.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356 28, G01B 902

Patent

active

039663248

ABSTRACT:
A laser doppler anemometer includes a source producing a laser beam which is then split into a plurality of partial radiation beams. A common optical image-forming system illuminates a measuring volume by the partial radiation beams and receives the back-scattered signal radiation therefrom which is directed into a detector, and a partially reflecting mirror arrangement is positioned in the common optical imageforming system for the purpose of masking out scattered signal radiation leaving the common optical image-forming system. The partially reflecting mirror arrangement can comprise two mirrors disposed plane parallel to each other, and it can include light transmissive elliptical rings or strips. A pinhole diaphragm, adjustable in a direction orthogonal to the optical axis of the detector and through which the back-scattered signal radiation passes is also provided and precedes the detector.

REFERENCES:
patent: 2565419 (1951-09-01), Aitcheson
patent: 2949071 (1960-08-01), Foures
patent: 3723004 (1973-03-01), Brayton

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