Two-axis image motion detector

Details Two-axis image motion detector Two-axis image motion detector

1972-11-01

1976-04-13

Wilbur, Maynard R.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

250203R, 250231SE, 250233, 356152, G01P 336, G01J 120

Patent

active

039500993

ABSTRACT:
A two-axis image motion detector detects two separate velocity channels through a single optical channel with a single photo detector. A single disc rotates at a substantialaly constant rotational speed and contains a pair of orthogonal grid patterns of different spatial frequencies. Preferably, each grid pattern is at 45.degree. with respect to a radial. An image focused on the grid pattern modulates the carrier frequencies determined by the different grid patterns, thereby generating a composite output in the single photo detector representing the sum of the two image motion channels. Standard filtering and demodulating techniques generate a DC voltage proportional to the image rate for each of the orthogonal axes.

REFERENCES:
patent: 2941080 (1960-06-01), Hansen
patent: 3500050 (1970-03-01), Hillman
patent: 3511150 (1970-05-01), Whitney et al.

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