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Optical direction sensor having gray code mask spaced from a plurality of interdigitated detectors

  • US 4,857,721 A
  • Filed: 03/28/1988
  • Issued: 08/15/1989
  • Est. Priority Date: 03/28/1988
  • Status: Expired due to Term
First Claim
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1. A direction of arrival sensor having particular utility for detecting and determining the angle of incoming radiation comprising:

  • a slit mask having at least one narrow transparent slit;

    a plurality of detector elements spaced from said slit mask and being responsive to incoming radiation passing through said transparent slit;

    said plurality of detector elements forming pairs of first and second detector combinations;

    differential means, coupled to each of said pairs of said first and second detector combinations, for providing an output signal indicative of the difference between the two input signals from said first and second detector combinations; and

    means, responsive to said differential means, for providing a digital signal indicative of the angle of incidence of the incoming radiation.

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