True ground speed sensor

Details True ground speed sensor True ground speed sensor

1990-10-12

1992-03-31

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356349, 356354, G01P 336, G01B 902

Patent

active

051002302

ABSTRACT:
A speed sensor for a moving vehicle. A transmissive grating is used in conjunction with an electromagnetic wave source and beam combining waveguide to mix two beams of frequency f and f+.DELTA.f, where .DELTA.f is proportional to the speed of the grating relative to the ground. The source energy is reflected off the road to the grating. The zeroth and first order transmission from the grating are mixed to give the beat frequency .DELTA.f proportional to the ground speed. The sensor has no moving parts, and is independent of any gear ratios.

REFERENCES:
patent: 3432237 (1969-03-01), Flower et al.
patent: 3525569 (1970-08-01), Gamertsfelder et al.
patent: 3820896 (1974-06-01), Stavis
patent: 3960410 (1976-06-01), Leitz et al.
patent: 4961643 (1990-10-01), Sakai et al.
"Interferometry", W. H. Steel, Second Edition, Cambridge University Press, 1983, pp. 57-58.
"Optical Frequency Shifting by Means of a Rotating Diffraction Grating," W. H. Stevenson, Applied Optics, vol. 9, No. 3, Mar. 1970, pp. 649-652.

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