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Realization method and device for square wave quadrature demodulation of closed-loop resonant optical gyroscope

A technology of quadrature demodulation and optical gyroscope, which is applied in the field of optical sensing and signal detection, can solve the problems of phase fluctuation of the square wave signal to be demodulated, achieve the effect of suppressing the fluctuation of the demodulated signal, suppressing performance degradation, and improving accuracy

Active Publication Date: 2022-04-26
ZHEJIANG UNIV
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Problems solved by technology

[0006] Aiming at the phase fluctuation problem of the square wave signal to be demodulated due to the change of environmental factors such as temperature in the closed-loop resonant optical gyroscope system, the present invention proposes a method and device for realizing square wave quadrature demodulation of the closed-loop resonant optical gyroscope

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  • Realization method and device for square wave quadrature demodulation of closed-loop resonant optical gyroscope
  • Realization method and device for square wave quadrature demodulation of closed-loop resonant optical gyroscope
  • Realization method and device for square wave quadrature demodulation of closed-loop resonant optical gyroscope

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Embodiment 1

[0092] Figure 9 This is the test result of the demodulation curve before and after square wave quadrature demodulation. The demodulation curve is obtained by scanning the center frequency of the laser. Figure 9 (a) is the demodulation curve without square wave quadrature demodulation; Figure 9 (b) is the demodulation curve under square wave quadrature demodulation, its working point θ 0 Set to π / 4rad. In the experiment, artificially set Δθ to 0, π / 20rad and π / 10rad. It can be found that when square wave quadrature demodulation is not used, such as Figure 9 As shown in (a), the slope of the demodulation curve will fluctuate with Δθ, so it is impossible to keep the slope of the demodulation curve at the maximum value; when the square wave quadrature demodulation method is adopted, as Figure 9 As shown in (b), the slope fluctuation of the demodulation curve is suppressed and almost kept near the maximum value.

Embodiment 2

[0094] To illustrate the necessity of optimizing the phase operating point when using square wave quadrature demodulation, Figure 10 The demodulation curve test comparison results when the operating point is set to 0 and π / 4rad are given. It can be found that when the operating point is set to 0, there is an obvious fluctuation around the resonance point, and when the operating point is set to π / 4rad, the fluctuation is suppressed.

Embodiment 3

[0096] Figure 11 The results of Allan variance analysis of the test data of gyroscope 1h output signal when the square wave quadrature demodulation method is used and the operating points are set to 0 and π / 4rad respectively are given. The integration time is 0.1s and the sampling rate is 10Hz. according to Figure 11 According to the Allan variance analysis results, when the quadrature demodulation operating point is set to 0, the zero bias stability of about 11.9deg / h can be obtained, which is even better than what we have reported Figure 12 The test result shown without the square wave quadrature demodulation scheme is worse at about 7.1deg / h, which may be caused by the demodulation curve fluctuating near the resonance point under the non-ideal phase operating point. However, when the operating point is set to π / 4rad, a bias stability of about 6.0deg / h can be obtained. The bias stability is about Figure 12 The non-square-wave quadrature demodulation scheme shown yiel...

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Abstract

The invention discloses a method and device for realizing square wave quadrature demodulation of a closed-loop resonant optical gyroscope, belonging to the technical field of optical sensing and signal detection. Utilize the photodetector to detect the light output by the optical resonant cavity, and then perform quadrature demodulation on the signal output by the photodetector through the square wave quadrature demodulation module to obtain the quadrature demodulation signal; the square wave quadrature The demodulation module contains two channels. In the first channel, the signal output by the photodetector obtains the first demodulated signal according to the reference signal of the first channel; in the second channel, the signal output by the photodetector is obtained according to the second channel The second demodulated signal is obtained from the reference signal; the final output square wave quadrature demodulated signal is obtained according to the difference between the first demodulated signal and the second demodulated signal. The invention can effectively suppress the performance degradation of the closed-loop resonant optical gyroscope system caused by the phase fluctuation of the square wave signal, and improve the precision of the optical gyroscope.

Description

technical field [0001] The invention relates to the technical field of optical sensing and signal detection, in particular to a method and device for realizing square wave quadrature demodulation of a closed-loop resonant optical gyroscope. Background technique [0002] The resonant optical gyroscope is a rotational angular velocity measurement sensor based on the Sagnac effect and with an optical ring resonant cavity as the core sensitive element. [0003] Phase modulation and demodulation technology can be used for resonant optical gyroscope signal detection, and this technology has been widely used in resonant optical gyroscope systems. In order to improve the accuracy of the resonant optical gyro system, a method of phase modulation and demodulation using various modulation waveforms has been proposed and applied to the resonant optical gyro system, including sine wave modulation, triangular wave modulation, and sawtooth wave modulation. modulation etc. In an actual re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/66
CPCG01C19/66G01C19/661G01C19/667
Inventor 应迪清刘强王泽宇谢涛金仲和
Owner ZHEJIANG UNIV
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