Method and apparatus for Doppler frequency modulation of radiati

Details Method and apparatus for Doppler frequency modulation of radiati Method and apparatus for Doppler frequency modulation of radiati

1978-11-03

1980-05-06

Buczinski, S. C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

350 65, 350 66, 350294, G01P 336

Patent

active

042014689

ABSTRACT:
A method and apparatus for frequency modulating radiation, such as from a laser, for optoacoustic detectors, interferometers, heterodyne spectrometers, and similar devices using two oppositely reciprocating cat's-eye retroreflectors to Doppler modulate the radiation. By reciprocally moving both retroreflectors, the center of mass is maintained constant to permit smooth operation at many Hertz. By slightly offsetting the axis of one retroreflector relative to the other, multiple passes of a light beam may be achieved for greater Doppler shifts with the same reciprocating motion of the retroreflectors. A Doppler shift of 2(v/c).nu. occurs for each pass where v is the velocity of each retroreflector, c is the speed of light, and .nu. is the frequency of radiation.

REFERENCES:
patent: 3437954 (1969-04-01), Herriott et al.
patent: 3732013 (1973-05-01), Hieslmair et al.
patent: 4123145 (1978-10-01), Botcherby et al.

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