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Light detection and signaling system

  • US 4,117,457 A
  • Filed: 03/23/1976
  • Issued: 09/26/1978
  • Est. Priority Date: 03/23/1976
  • Status: Expired due to Term
First Claim
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1. A system for detecting and signaling the presence of a moving localized incident light source having an intensity located at a distance from the system wherein the system and the localized incident light source move with respect to each other, comprising:

  • a first photosensitive surface for detecting the intensity of the localized incident light source, said first photosensitive surface having a configuration for detecting said intensity of the localized incident light source in a 360°

    arc contained within a horizontal plane surrounding said first photosensitive surface and for generating a first output signal representative of said intensity of the localized incident light source;

    a second photosensitive surface optically isolated from said first photosensitive surface being nonresponsive to the localized incident light source and being substantially responsive to ambient light for generating a second output signal representative of a predetermined level of ambient light;

    first circuit means for receiving said first and second output signals of said first and second photosensitive surfaces and for generating a third output signal in response to receipt of both of said first and second output signals;

    second circuit means responsive to said third output signal for generating a fourth output signal having a frequency, said frequency of said fourth output signal being directly related to said intensity of the localized incident light source detected by said first photosensitive surface; and

    means for emitting light connected to said first and second circuit means responsive to said fourth output signal for being selectively illuminated to flash on and off at a variable rate of flash, said flash rate increasing as the distance between the system and the localized incident light source moving with respect to each other decreases.

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