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US 12,281,897 B2Granted
Ring laser gyroscope
AssigneeJapan Aviation Electronics Industry, Limited
InventorsYusuke Gocho, Naoki Yamamoto, Kazunori Yoshioka, Kenji Abe
Life of this patent
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Abstract
A ring laser gyroscope includes an optical block for generating laser beams that counter-propagate in a closed-loop type optical path, a dither mechanism for applying dither vibration for mitigating a lock-in phenomenon to the optical block, and a dither controller for controlling the dither vibration. The dither controller imparts randomness to the frequency of the angular velocity of the dither vibration.
Claims8
A ring laser gyroscope comprising:
- an optical block including a closed loop optical path and configured to generate laser beams counter-propagating in the closed loop optical path;
- a dither mechanism configured to apply dither vibration for mitigating a lock-in phenomenon to the optical block;
- a sensor to detect a displacement angle of the optical block;
- and
- a dither controller comprising:
- a phase shifter;
- and a random noise generator to generate a random noise, and configured to drive the dither mechanism by a signal that is obtainable by the phase shifter shifting a phase of a signal representing the displacement angle of the optical block by a time-varying amount of phase shift obtainable by fluctuating depending on the random noise a constant amount of phase shift necessary for making the dither mechanism vibrate at a natural frequency of the dither mechanism, thereby making the dither vibration nonconstant in frequency of angular velocity of the dither vibration by having randomness.
4 more elements
Dependencies are inferred from the claim text.