Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1992-02-24
1993-06-01
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
356356, G01P 336
Patent
active
052164780
ABSTRACT:
A Doppler velocity meter has a radiation source for emitting a radiation beam the wavelength of which fluctuates, such as a laser; an optical system for directing the radiation beam to an object at an incident angle .theta. and a detector for detecting scattered beam generated from the object by directing the radiation beam. The optical system has a diffraction grating which serves to change the incident angle .theta. in accordance with a change in the wavelength .lambda. of the radiation beam in such a manner as to maintain the value of sin .theta./.lambda. substantially constant. The velocity meter can accurately detect the velocity of movement of the object regardless of any change in the wavelength .lambda., because the diffraction grating serves to substantially compensate for any change in the frequency of the scattered beam caused by the change in the wavelength.
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Ishida Yasuhiko
Kadowaki Hidejiro
Sugiyama Hiroshi
Takahashi Haruhiko
Takamiya Makoto
Buczinski Stephen C.
Canon Kabushiki Kaisha
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