Resonant optical gyroscope based on fast-speed high-precision frequency tracking and locking technology

A locking technology and optical gyroscope technology, applied in the field of resonant optical gyroscope, can solve the problem of reducing the response speed of the loop

Active Publication Date: 2012-06-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the basis of the proportion, adding the integral (Integrator, I) link can effectively eliminate the locking residual error, however, the addition of the integral link will greatly reduce the loop response speed

Method used

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  • Resonant optical gyroscope based on fast-speed high-precision frequency tracking and locking technology
  • Resonant optical gyroscope based on fast-speed high-precision frequency tracking and locking technology
  • Resonant optical gyroscope based on fast-speed high-precision frequency tracking and locking technology

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the present invention is not limited thereto.

[0019] Such as figure 1 As shown, a resonant optical gyroscope based on servo loop closed-loop locking technology includes a tunable laser, an optical splitter, a first frequency shifter (acousto-optic frequency shifter AOM), a second frequency shifter (acousto-optic shifter frequency shifter AOM), the third frequency shifter (acousto-optic frequency shifter AOM), the first modulator (phase modulator PM), the second modulator (phase modulator PM), optical cavity (optical waveguide chip), An optical system composed of a photoelectric conversion module (PD), as well as a modulation and demodulation module (lock-in amplifier lock-in), a proportional-integral feedback module (FPGA), a proportional control feedback module (FPGA) and a high-order integral feedback module (FPGA) The processing circuit compos...

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Abstract

The invention discloses servo loop feedback control technology in a resonant optical gyroscope. The resonant optical gyroscope comprises an optical system composed of a tunable laser, an optical splitter, three frequency shifters, two modulators, an optical resonant cavity, and a photoelectric conversion module; and a processing circuit composed of a modulation/demodulation module, and three feedback locking modules. The invention relates to control technology where a P (proportion) module forms a fast small-amplitude frequency feedback while an I (integrator) or PI module forms a slow large-amplitude frequency feedback, adopts a high-order integrator I<n> (n is an integer greater than or equal to 2) or PI<n> to track the temperature change caused resonant frequency linear drift problem and suppress low frequency noise, and connects the P, I and I<n> in parallel to form a resonant frequency servo loop, to therefore reduce the resonant frequency drift caused by rapid laser frequency fluctuation and ambient temperature in the loop, and improve frequency locking precision and system frequency response characteristics.

Description

technical field [0001] The invention relates to the resonant frequency servo circuit technology in the vibratory optical gyroscope, in particular to a resonant optical gyroscope based on fast and high-precision frequency tracking and locking technology. Background technique [0002] Resonant optical gyro is a new type of high-precision angular velocity sensor based on the Sagnac effect. Its sensitive device optical ring resonator can be realized by using a very short optical fiber or integrated optics, so it has unique advantages in miniaturization and integration. Advantage. In the resonant optical gyroscope, the angular rate is obtained by detecting the resonant frequency difference between the clockwise and counterclockwise optical paths of the resonant cavity. Actual optical devices such as lasers and resonators are affected by environmental factors such as temperature and stress, which will introduce various reciprocal noises into the loop, while the clockwise and coun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/66G01C19/68
Inventor 马慧莲严昱超俞旭辉金仲和
Owner ZHEJIANG UNIV
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