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Mapping of blood vessels for biometric authentication

  • US 9,959,477 B2
  • Filed: 07/29/2016
  • Issued: 05/01/2018
  • Est. Priority Date: 03/03/2014
  • Status: Expired due to Fees
First Claim
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1. Apparatus for thermoacoustic imaging, the apparatus comprising:

  • a microwave source configured to provide a microwave output;

    a microwave emitter array including two or more unit cells, wherein the unit cells each comprise two or more near-field excitation elements;

    wherein the microwave emitter array is configured to receive the microwave output from the microwave source, and wherein the microwave emitter array is configured to provide microwave excitation to a target via the near-field excitation elements of the unit cells, wherein a spacing between the microwave emitter array and the target is 10 wavelengths or less, wherein the wavelength is a wavelength of the microwave emitter array within the target;

    wherein the microwave output is provided to the near-field excitation elements of the unit cells with relative phases selected to provide polarization eccentricity of 0.87 or less within the target;

    an acoustic sensor array having one or more sensor elements configured to receive acoustic signals from the target responsive to the microwave excitation;

    a processor configured to receive signals from the acoustic sensor array and to provide an acoustic image of the target.

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