Photoreceptor motion sensor using a segmented photosensor array

Details Photoreceptor motion sensor using a segmented photosensor array Photoreceptor motion sensor using a segmented photosensor array

1992-04-06

1993-04-20

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

250571, G01P 336

Patent

active

052046206

ABSTRACT:
The actual position and velocity of a photoreceptor belt is accurately measured by sensing the passing of illuminated holes in the belt, as the belt moves in a process direction. A segmented sensor array is positioned so as to view the passing of the illuminated holes. A Gaussian light intensity distribution is sensed by a group of sensor pixels which sense the light during a sampling interval. The array produces an output which is operated upon by a centroid processor to determine the center of moment for each sampled intensity distribution. A prediction is then made for projected position of the belt which is very accurate since the centroid calculation is not effected by noise produced by stray light or poorly defined image edges.

REFERENCES:
patent: 4837636 (1989-06-01), Daniele et al.
"Sampling Thereon for Geometric Moment Determination and Its Application to a Laser Beam Position Detector" Robert P. Loce et al., Applied Optics, vol. 29, No. 6, Sep. 10, 1990, pp. 3835-3843.

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