System and method for generating band-limited quasi-sinusoidal s

Details System and method for generating band-limited quasi-sinusoidal s System and method for generating band-limited quasi-sinusoidal s

1999-03-08

2000-02-29

Lee, John R.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214R, 250221, 25023113, 345158, H01J 4014, G01V 904

Patent

active

060312181

ABSTRACT:
A method for generating quasi-sinusoidal signals includes illuminating an object capable of reflecting light, focusing a portion of the reflected light on a multi-element detector to form an image, and matching the image size to the size of the detector elements. A first weighted sum of signals generated by a first set of elements produces an in-phase signal, and a second weighted sum of signals generated by a second set of elements produces a quadrature signal. Weights are signed quantities selected to exhibit a band-pass behavior in the spatial frequency domain, thereby attenuating noise generated by, for example, non-uniform surface reflectance and non-uniform illumination.

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