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Inexpensive interferometric eye tracking system

  • US 5,638,176 A
  • Filed: 06/25/1996
  • Issued: 06/10/1997
  • Est. Priority Date: 06/25/1996
  • Status: Expired due to Fees
First Claim
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1. An eye tracking system comprising:

  • a narrow band tunable light source;

    modulating means for modulating said light source with a modulating frequency fmod ;

    a photo detector;

    scanning means passing modulated light from said light source to a user'"'"'s eye and reflecting light returned from a cornea and a retina of the user'"'"'s eye to said photo detector, said photo detector measuring interference fringes formed by light returned from the cornea and light returned by the retina; and

    signal processing means connected to said photo detector for processing the measured interference fringes between light returned from the cornea and the retina of the eye to generate an output signal representative of a direction of a user'"'"'s gaze.

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