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Portable handheld artificial light detector

  • US 7,521,662 B1
  • Filed: 10/18/2007
  • Issued: 04/21/2009
  • Est. Priority Date: 10/19/2001
  • Status: Expired due to Term
First Claim
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1. A light detector comprising:

  • a first filter coupled to receive an electrical signal representing received light and to output a first filtered signal;

    a second filter coupled to receive in parallel the same electrical signal as the first filter and to output a second filtered signal, the first filtered signal causing a first type of light to be indicated by the light detector unless the second filtered signal is stronger, and the second filtered signal causing a second type of light to be indicated by the light detector unless the first filtered signal is stronger;

    a portable, self-contained energy source to power the first filter and the second filter; and

    a housing dimensioned to enclose only said light detector.

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