Laser device for measuring wind speeds at medium altitudes by us

Details Laser device for measuring wind speeds at medium altitudes by us Laser device for measuring wind speeds at medium altitudes by us

1990-06-22

1992-02-18

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356342, 356352, 359589, 359891, G01P 336, G02B 528, G01N 2100, G01B 902

Patent

active

050888153

ABSTRACT:
A device for measuring the speed of the wind at medium altitude by the Doppler effect within the visible frequency range comprises a laser which emits pulses of light, a telescope which receives a scattered light and an interferometer used to measure the spectral shift of the scattered light in relation to the emitted pulse of light. The interferometer is a Fabry-Perot interferometer in which a part of one of the two mirrors of the interferometer is covered with an excess thickness of silica to form two separate filters. The spacing of the two mirrors and the excess thickness of silica are determined in such a manner that the pass bands of each one of the two filters thus constructed are centered on the flanks of the spectral distribution of the backscattered light.

REFERENCES:
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patent: 3282148 (1966-11-01), Yamada
patent: 3410626 (1968-11-01), Magrath
patent: 3712980 (1973-01-01), Norton
patent: 3788743 (1974-01-01), George
patent: 3795448 (1974-03-01), Fletcher et al.
patent: 4195931 (1980-04-01), Hara
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patent: 4558950 (1985-12-01), Ulrich et al.
patent: 4735503 (1988-04-01), Werner et al.
Valette et al., "Integrated-optical circuits achieved by planar technology on silicon substrates: application to the optical spectrum analyser", IEEE Proceedings Section A a I, vol. 131, No. 5, Oct. 1984, pp. 325-331.

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