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Optical strapdown inertia system

  • US 4,315,693 A
  • Filed: 12/31/1979
  • Issued: 02/16/1982
  • Est. Priority Date: 12/31/1979
  • Status: Expired due to Term
First Claim
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1. An optical strapdown inertial guidance system including:

  • a. A vehicle having a gyro and an accelerometer respectively mounted in three mutually perpendicular intersecting planes to sense acceleration components in each plane;

    b. Said gyro including a passive ring Fabry-Perot interferemoter, and, a single frequency laser source to measure the difference in clockwise and counter clockwise lengths of the cavity caused by inertial rotation, electronic the cavity to resonance.c. Said accelerometers comprising a single frequency laser source, a resonant cavity having a birefringent material therein, a proof mass carried by said birefringent material, a first polarizer for polarizing the laser beam, means disposed between said cavity and said polarizer for changing the optical frequency of the laser beam, focusing means for focusing the output laser beam from said cavity, detector means for receiving said output laser beam, feedback circuit means connected to said photo detector means and said SAW to vary the frequency of said laser beam.

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