Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1984-05-11
1987-09-29
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
342104, 367 95, G01P 336
Patent
active
046965688
ABSTRACT:
A method of and an arrangement for measuring the velocity and/or length of moving objects using the Doppler principle. Measurement of the velocity of objects over a wide range imposes stringent requirements on the bandwidth of the electronic apparatus which process the Doppler shift. The velocity and/or length are measured accurately using simple, narrow-band electronic processing circuits by imparting a pre-shift to the frequency of the electromagnetic wave directed towards the object to be measured. This pre-shift is opposite to the Doppler shift generated by the movement of the object and is realized by imaging a light beam originating from a laser onto the object via a rotating phase grating. The rate of rotation of the phase grating is controlled so that the total Doppler shift measured is always constant.
REFERENCES:
patent: 3202960 (1965-08-01), Galbraith
patent: 3930734 (1976-01-01), Holly et al.
patent: 4373807 (1983-02-01), Gouesbet
P. Buchhave, Optics & Laser Technology, Feb. 1975, vol. 7, No. 1.
W. H. Stevenson, Applied Optics, Mar. 1970, vol. 9, No. 3.
Buczinski Stephen C.
Franzblau Bernard
Mayer Robert T.
U.S. Philips Corporation
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