Weak value amplification Coriolis vibratory gyroscope

Patent metadata

Field	Value
Publication number	US-11060868-B2
Application number	US-202016844378-A
Country	US
Kind code	B2
Filing date	Apr 9, 2020
Priority date	Apr 9, 2019
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

A weak value amplification (WVA) Corolis vibratory gyroscope (CVG) is provided for measuring angular rate. The WVA CVG includes a vibratory structure that induces a deflection; an optical weak value amplifier that amplifies the deflection as an amplified signal; and a weak value detector to measure the amplified signal to determine the angular rate. Further exemplary embodiments provide first and second plates, a laser, a polarizing filter, a beam-splitter, left and right mirrors, a half-wave plate, a retarder and a detector. The laser emits an emission beam of photons. The polarizing filter polarizes the emission beam. The beam-splitter divides the beam into left and right beams reflected by the left and right mirrors. The retarder imposes a phase difference between the left and right beams. The detector measures the left and right beams.

First claim

What is claimed is:

1. A Coriolis vibratory gyroscope (CVG) for measuring an angular rate, said CVG comprising:
a vibratory structure that induces a deflection, said vibratory structure including a flat surface;
a rigid plane having a corner that contacts said flat surface;
an optical readout amplifier that enhances said deflection as an amplified signal; and
a detector to measure said amplified signal to determine the angular rate, wherein said readout amplifier and said detector are mounted to said rigid plane, and said readout amplifier uses quantum weak value amplification (WVA).

2. The CVG according to claim 1 , wherein
said vibratory structure is a rectangular crystal with said deflection being translation along an axis normal to said flat surface, and
said readout amplifier is an interferometer.

3. The CVG according to claim 2 , wherein said interferometer comprises:
a laser for emitting a coherent beam that enters and exits said interferometer;
a beam-splitter that divides said beam into a loop of left and right beams; and
a retarder to induce a phase shift between said left and right beams parallel to said rigid plane, wherein said left and right beams recombine and exit said loop at said beam-splitter.

4. A weak value amplification (WVA) Coriolis vibratory gyroscope (CVG) for measuring angular rate, said WVA CVG comprising:
a first plate having a corner;
a second plate having a flat surface that contacts said corner of said first plate at 45° between said flat surface of said second plate and an edge of said first plate, said second plate translating normal to said flat surface;
a laser that emits an emission beam of photons;
a polarizing filter for polarizing said emission beam;
a beam-splitter for dividing said beam into left and right beams;
left and right mirrors for reflecting respective said left and right beams;
a half-wave plate for shifting polarization of said left and right beams by 90° ;
a retarder for imparting a phase difference between said left and right beams; and
a detector for measuring said left and right beams, wherein
said laser, said polarizing filter, said beam-splitter, said mirrors, said half-wave plate, said retarder and said detector are disposed on said first plate,
said second plate rotationally oscillates back and forth about an axis normal to said flat surface, and
said left and right beams reflecting from said flat surface of said second plate, reflecting from respective said right and left mirrors, passing through said beam-splitter and reaching said detector.

5. The WVA CVG gyroscope according to claim 4 , wherein said laser is a helium neon laser.

Assignees

• Josemans Garrett K
• Us Navy

Inventors

• Josemans Garrett K

Classifications

• A42B3/128

  with zones of different density · CPC title

• G01C19/721

  Details, e.g. optical or electronical details · CPC title

• G01C19/5642

  using vibrating bars or beams · CPC title

• G01C19/64 Primary

  Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams · CPC title

• G01C19/5726

  Signal processing · CPC title