Smoke detector for false alarm reduction

  • US 10,741,036 B1
  • Filed: 08/22/2019
  • Issued: 08/11/2020
  • Est. Priority Date: 01/31/2019
  • Status: Active Grant
First Claim
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1. A smoke detector, comprising:

  • a first light source, configured to generate first light beam with a first wavelength;

    a second light source, configured to generate second light beam with a second wavelength;

    a light receiver, configured to generate a first original light detecting signal in response to first scattered light of the first light beam, and configured to generate a second original light detecting signal in response to second scattered light of the second light beam, wherein a first energy conversion efficiency of the light receiver at the first wavelength is different from a second energy conversion efficiency of the light receiver at the second wavelength;

    a signal adjusting circuit, configured to amplify the second original light detecting signal to generate a second light detecting signal; and

    a driving and determining circuit, coupled to the first light source, the second light source, the light receiver, and the signal adjusting circuit, configured to determine signal intensities of the first original light detecting signal and the second light detecting signal;

    wherein if the driving and determining circuit determines a signal intensity of the first original light detecting signal is larger than or equal to a first signal threshold value, the driving and determining circuit controls the first light source to not generate the first light beam and the second light source to generate the second light beam, and then if the driving and determining circuit determines a signal intensity of the second light detecting signal is not larger than a second signal threshold value, the smoke detector generates a warning message.

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