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Biometric object sensor and method

  • US 9,697,411 B2
  • Filed: 09/09/2015
  • Issued: 07/04/2017
  • Est. Priority Date: 03/27/2012
  • Status: Active Grant
First Claim
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1. A biometric image sensor comprising:

  • a first light source having a first wavelength λ

    1;

    a second light source having a second wavelength λ

    2;

    a photodetector configured and positioned to receive light of the first wavelength λ

    1 and light of the second wavelength λ

    2 reflecting from a biometric object being imaged and to produce a first reflectivity output indicative of the amount of reflectance of the light of the first wavelength λ

    1 and a second reflectivity output indicative of the amount of reflectance of the light of the second wavelength λ

    2; and

    a processor configured to compare the difference between the first reflectivity output and the second reflectivity output to detect one or more of a leading edge, peak or trailing edge of a change in absorption of oxygen in blood of the biometric object.

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