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Compact biometric authentication device and associated methodology of imaging and detecting living-tissue patterns

  • US 8,811,680 B2
  • Filed: 01/17/2012
  • Issued: 08/19/2014
  • Est. Priority Date: 05/09/2002
  • Status: Expired due to Fees
First Claim
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1. An apparatus, comprising:

  • a light emitting unit configured to emit near-infrared source light toward biological tissue;

    an imaging sensor configured to detect an image of a blood vessel, which is generated by scattered light scattered at the tissue, the imaging sensor further configured to convert the image to an electrical signal; and

    circuitry configured to detect a change in absorbance of the source light in blood in the tissue based on the electrical signal via obtaining a change in frequency between incident light and the scattered light as beat signals by detecting an interference between the incident light and the scattered light,wherein the change in the absorbance of the source light in the blood corresponds to a heart beat, andwherein the circuitry determines whether there is an absence of blood flow based on the detected change in the absorbance of the source light in the blood.

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