Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1975-10-14
1977-07-19
Buczinski, S.C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
356118, G01P 336
Patent
active
040365573
ABSTRACT:
A laser doppler velocimeter for measuring one or more velocity components of a moving material, fluid or solid, using a single set of optical focusing elements. A unique two component beam splitter provides multiple pairs of parallel beams, one pair from each input radiation beam from a given laser source.
Each incident radiation input beam is separated by means of a selectively transmissive coating on one of the roof faces of an Amici prism into a first beam comprising substantially all of the polarized component parallel to the plane of incidence (P polarization) and one-half of the polarization component normal to the plane of incidence (S polarization), and a second beam comprising one-half of the S polarization component alone. At the measuring point, the two beams interfere, with the S components producing a differential doppler frequency superimposed on a non-doppler pedestal, while the P component contains only the non-doppler pedestal. The detector beam splitter directs the P polarization component to one radiation detector and the S polarization component to the remaining detector. The analog electrical equivalent signal to the optical P component signal is electrically subtracted from the electrical analog equivalent to the S component signal, the pedestal is removed, and this signal is divided by the P component signal to yield a signal having the pure doppler differential frequency information.
The invention provides dual beam redundancy, extremely simple alignment, and two velocity measuring ranges.
REFERENCES:
patent: 3723004 (1973-03-01), Brayton
patent: 3753616 (1973-08-01), Goethert
patent: 3915572 (1975-10-01), Orloff
Buczinski S.C.
Noctua, Inc.
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