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Transit time testing method of fiber optic gyroscope

A time-of-flight and fiber optic gyroscope technology, which is applied to Sagnac effect gyroscopes and other directions, can solve the problem of accurately measuring the precise value of the fiber optic gyroscope's characteristic period

Inactive Publication Date: 2007-09-12
ZHEJIANG UNIV
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Problems solved by technology

For low-to-medium precision gyroscopes, this approximate value is sufficient for the system, but in high-precision fiber optic gyroscopes, more accurate values ​​are required, which needs to be done by other methods, and there is currently no accurate value that can accurately measure the characteristic period of fiber optic gyroscopes Methods

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  • Transit time testing method of fiber optic gyroscope
  • Transit time testing method of fiber optic gyroscope
  • Transit time testing method of fiber optic gyroscope

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0047] In Figure 1, a is the modulated square wave waveform used by the fiber optic gyroscope system. This waveform is loaded on the phase modulator of the system. Under the premise of not damaging the phase modulator, the amplitude of the square wave is an integer not equal to the half-wave voltage of the modulator times any voltage; when it is 1 / 4 of the half-wave voltage of the phase modulator, the system test accuracy is the highest, and the square wave period is greater than twice the estimated value of the system characteristic period, which is obtained in the process of optical fiber wrapping; b is the square wave After the wave waveform passes through the fiber optic ring for one week, the delay waveform corresponds to the time tao of the characteristic period; c is the actual phase modulation size of the system, which is obtained from the time delay d...

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Abstract

This invention relates to a kind of fiber-optic gyro transition time's testing method, adopting square wave that complete alternation is given and twice greater than fiber-optic gyro eigenperiod estimated value to process phase modulation to fiber- optic gyro system; take spectral analysis of output signal of now time, gain the spectral distribution; then through data processing to gain systemic transition time. The invention could use high speed sample circuit to take sample from system output signal, to gain sampling sequence composed by a series of sampling cost, and through processing spectral analysis to this sampling sequence to get the spectral distribution; also can directly utilize frequency response analyzer to process spectral analysis to systemic output signal. According to system output signal's spectral distribution, to judge amplitude crossover point position corresponding spectra of spectral distribution, by format to obtain systemic transition time. This method can accurately gain systemic transition time parameter, thereby advance fiber-optic gyro's static state performance, depress systemic drift error.

Description

technical field [0001] The invention relates to a signal processing method in an optical fiber gyroscope sensor, in particular to a method for testing the transit time of an optical fiber gyroscope. Background technique [0002] The transit time of the fiber optic gyroscope is the time it takes for light to propagate in the reciprocal optical path of the fiber optic gyroscope for one week, and its reciprocal is called the characteristic frequency of the fiber optic gyroscope, and the transit time is also called the characteristic period of the fiber optic gyroscope. [0003] The fiber optic gyroscope has two working modes, which are open-loop operation mode and closed-loop operation mode. The fiber optic gyroscope operating in the open-loop mode has low precision and poor linearity of the scale factor; while the fiber optic gyroscope operating in the closed-loop mode can overcome these shortcomings, so high-precision fiber optic gyroscopes all adopt the closed-loop operation...

Claims

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Application Information

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IPC IPC(8): G01C19/72
Inventor 刘承陈杏藩舒晓武
Owner ZHEJIANG UNIV
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