Resonance optic gyro based on digital phase oblique wave frequency shift technology

An optical gyroscope, resonant technology, applied in Sagnac effect gyroscope and other directions, can solve the problems of large volume, difficult ROG miniaturization and integration, etc., achieve large dynamic range, easy miniaturization and integration, reduce The effect of small optical Kerr noise

Inactive Publication Date: 2012-06-27
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The second closed loop needs to add a frequency shifter in the second loop. The traditional acousto-optic fre

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  • Resonance optic gyro based on digital phase oblique wave frequency shift technology
  • Resonance optic gyro based on digital phase oblique wave frequency shift technology
  • Resonance optic gyro based on digital phase oblique wave frequency shift technology

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with examples and accompanying drawings, but the present invention is not limited thereto.

[0023] Such as figure 1 As shown, the resonant optical gyroscope based on the digital phase ramp frequency shift technology includes an optical system composed of a tunable laser, an optical splitter, a first phase modulator, a second phase modulator, an optical resonant cavity, and a photoelectric conversion module , a processing circuit composed of a first demodulation module, a second demodulation module, a first modulation signal generator module, a second modulation signal generator module, a frequency shift feedback control module, and a feedback locking module; tunable laser, optical splitter The splitter, the first phase modulator, the optical resonant cavity, the photoelectric conversion module, the first demodulation module, and the feedback locking module are connected in sequence, the feedback loc...

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Abstract

The invention discloses a resonance optic gyro based on digital phase oblique wave frequency shift technology. The resonance optic gyro comprises an optical system composed of a tunable laser, an optical shunt, two phase demodulators, an optical resonance cavity and a photoelectric conversion module, and a processing circuit composed of two demodulation modules, two modulation signal generator modules, a frequency shift feedback control module and a feedback locking module, wherein a first signal extracted by the first demodulation module is controlled by the feedback locking module to adjust the central frequency of the tunable laser, and a second signal extracted by the second demodulation module is subjected to second frequency locking by the frequency shift feedback control module; and the output of the frequency shift feedback control module serves as the rotation output of the gyro. According to the invention, a resonance optic gyro structure is constructed, the digital phase oblique wave frequency shift technology is adopted in a second closed loop of the resonance optic gyro structure, the resonance optic gyro structure is favorable for miniaturization and integration of a system, improving the linearity and increasing the dynamic range of the system, and reducing reciprocity noise in the system.

Description

technical field [0001] The invention relates to the field of optical sensing and signal detection, in particular to a resonant optical gyroscope based on digital phase ramp frequency shift technology. Background technique [0002] Resonator Optic Gyroscope (ROG) is a new type of high-precision angular velocity sensor based on Sagnac effect. and integration have great advantages. In the resonant optical gyroscope, the rotational angular rate of the gyroscope is obtained by detecting the resonant frequency difference between the clockwise and counterclockwise optical paths of the resonant cavity. [0003] In order to improve the dynamic range of the gyroscope and the linearity of the scale factor, ROG usually needs to adopt a dual-channel closed-loop control technology. The first closed loop usually controls the center frequency of the output light of the laser through feedback, so that the center frequency of the laser is tracked and locked to the resonance frequency of the...

Claims

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Application Information

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IPC IPC(8): G01C19/66
Inventor 马慧莲卢霄俞旭辉金仲和
Owner ZHEJIANG UNIV
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