Quick measuring method for fiber-optic gyroscope transition time based on digital sawtooth wave

A fiber optic gyroscope and time-of-flight technology, which is used in Sagnac effect gyroscopes, testing optical performance and other directions, can solve problems such as changes in time-of-flight and achieve the effect of high-precision characteristics

Inactive Publication Date: 2014-07-23
ZHEJIANG UNIV
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Problems solved by technology

[0005] Aiming at the accurate measurement of time of flight in the current engineering production of medium and high precision fiber optic gyroscopes, and solving the problem of time of flight changes caused by optical system adjustments in the production process, the purpose of this invention is to provide a fiber optic gyroscope based on digital sawtooth waves Rapid measurement method of transit time

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  • Quick measuring method for fiber-optic gyroscope transition time based on digital sawtooth wave
  • Quick measuring method for fiber-optic gyroscope transition time based on digital sawtooth wave
  • Quick measuring method for fiber-optic gyroscope transition time based on digital sawtooth wave

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] The inventive method comprises the following steps:

[0030] 1) The electro-optic modulator is modulated by a digital sawtooth wave signal, and the peak-to-peak value of the sawtooth wave signal is fixed;

[0031] 2) The sawtooth wave signal is traversed in increasing order within the cycle value range until the cycle value range of the sawtooth wave signal is traversed. The modulation results of the sawtooth wave signal under different cycles are sampled and processed to form a result sequence, and traversed The step size is one-tenth of the period value range of the sawtooth signal;

[0032] 3) According to the sawtooth wave signal period corresponding to the minimum value in the result sequence, calculate the initial measurement result of the fiber optic gyroscope transit time as a rough value;

[0033] 4) Set the value ra...

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Abstract

The invention discloses a quick measuring method for fiber-optic gyroscope transition time based on digital sawtooth wave. An electrooptical modulator is modulated by digital sawtooth wave signals, the sawtooth wave signals are traversed in a periodical value range one by one in a progressive increasing mode, modulation results of sawtooth wave signals in different periods are sampled and processed to form a result sequence, an initial measuring result is calculated out according to the period of the sawtooth wave signals corresponding to the minimum value in the result sequence, a second periodical value range is set according to the initial measuring result, the above steps are repeated to obtain a second measuring result sequence, and a second measuring result is calculated according to the period of the sawtooth wave signal corresponding to the minimum value of the second measuring result sequence to obtain a final fiber-optic gyroscope transition time. The quick measuring method can quickly test the fiber-optic gyroscope transition time without adding testing equipment or periods, solves the problem of transition time change caused by adjusting an optical system in a fiber-optic gyroscope producing process and flexibly meets engineering and batching production of fiber-optic gyroscopes.

Description

technical field [0001] The invention relates to a processing method of an optical fiber gyroscope signal, in particular to a method for rapidly measuring the transit time of an optical fiber gyroscope based on a digital sawtooth wave. Background technique [0002] The time required for light to propagate for one week in the reciprocal optical path of the fiber optic gyroscope is called the transit time. At present, digital closed-loop technology is mostly used in the field of medium and high-precision fiber optic gyroscope research at home and abroad. The fiber optic gyroscope is modulated by an electro-optical modulator, and the analog-to-digital converter converts the output analog voltage signal of the fiber optic gyroscope into a digital signal. Perform differential demodulation processing. The electro-optic modulator has two main functions: time-delay differential modulation, changing the working bias point of the fiber optic gyroscope to improve sensitivity and linear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G01C19/72
Inventor 赵辛毕然陈杏藩刘承
Owner ZHEJIANG UNIV
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