Range dispersion sensor

Details Range dispersion sensor Range dispersion sensor

1988-12-27

1990-09-04

Yarcza, Thomas H.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 3, 356 5, 356 21, 342123, 342130, G01C 308

Patent

active

049539728

ABSTRACT:
A range dispersion sensor operative to detect objects of a preselected height "h" operates on quarterwave interference principles. Electromagnetic energy is modulated at a first frequency f.sub.1 such that objects of the preselected height h disposed upon a background create a quarter-wave length reflector. A beam of electromagnetic energy reflected from an object of height h and its proximate background interferes destructively to create a null signal. Effects of non-uniform reflectivity are normalized by modulating the beam at a second frequency f.sub.2 selected to not create constructive or destructive interference effects with objects of the preselected height. The ratio of the two signals is taken thereby normalizing the effects of non-uniform reflectivity, and the resultant ratio is indicative of the height of the objects.

REFERENCES:
patent: 2436627 (1948-02-01), Blitz
patent: 3068471 (1962-12-01), Erst
patent: 4413904 (1983-08-01), Hamada et al.
patent: 4537502 (1985-08-01), Miller et al.
patent: 4689489 (1987-08-01), Cole
patent: 4699508 (1987-10-01), Bolkow et al.
patent: 4743110 (1988-05-01), Arnaud et al.
patent: 4744653 (1988-05-01), Sano et al.

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