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Smoke sensor and monitor control system

  • US 6,011,478 A
  • Filed: 04/29/1998
  • Issued: 01/04/2000
  • Est. Priority Date: 05/08/1997
  • Status: Expired due to Term
First Claim
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1. A smoke sensor comprising:

  • light receiving means for temporally alternately receiving scattered light of two different wavelengths λ

    1 and λ

    2 ;

    calculating means for performing a calculation required for smoke detection, on a scattered light output y of the wavelength λ

    1 and a scattered light output g of the wavelength λ

    2 from said light receiving means; and

    smoke detection processing means for performing a smoke detection process on the basis of a calculation result output from said calculating means, said calculating means estimating an output value of one of the scattered light output y of the wavelength λ

    1 and the scattered light output g of the wavelength λ

    2 which are temporally alternately output from said light-receiving means, at a sample timing of the other output, and obtaining a ratio of the estimated output value of the one scattered light at the sample timing of the other output to an output value of the other scattered light, as a two-wavelength ratio.

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