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Method for improving open cycle digital optical fiber gyroscope scale factor linearity

A digital optical fiber and scale factor technology, applied in Sagnac effect gyroscopes, analog/digital conversion calibration/testing, measurement devices, etc. FOG scale factor error, etc., to achieve the effect of simple and convenient compensation method, high practical value, and easy operation

Inactive Publication Date: 2008-07-09
ZHEJIANG UNIV
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Problems solved by technology

In this way, the subtraction of the two will bring a greater error to the scale factor of the open-loop fiber optic gyroscope
At the same time, the integral nonlinear error corresponding to different digital codes is different, which directly leads to the deterioration of the linearity of the open-loop digital fiber optic gyroscope scale factor

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  • Method for improving open cycle digital optical fiber gyroscope scale factor linearity
  • Method for improving open cycle digital optical fiber gyroscope scale factor linearity

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Embodiment Construction

[0027] Principle of the present invention:

[0028] The principle of interferometric open-loop digital fiber optic gyroscope can be expressed by the following three formulas:

[0029] Δφ R =(2πLD*Ω / λc)*π / 180 (1)

[0030] Among them, L is the length of the fiber ring, D is the diameter of the fiber ring, Ω is the sensitive input angular velocity, λ is the wavelength in vacuum, c is the speed of light in vacuum, Δφ R is the transformed sagnac phase difference. The sensed input angular velocity is converted into a phase change by using a fiber optic ring.

[0031] I=I 0 (1+cosΔφ R ) (2)

[0032] Among them, I 0 is the average light intensity output by the interferometer. The phase change information is converted into light intensity changes using a sagnac interferometer.

[0033] dsp_in=I*G pin *G prea *G ad (3)

[0034] Among them, G pin is the conversion factor of the PIN detector, which converts the change of light intensity into a voltage signal. G prea...

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Abstract

The invention discloses a method for improving linearity of scale factors of a digital open loop optical fiber gyroscope, which comprises the following steps of: constructing a test system for analog value input-digital code output of an analog-to-digital converter; obtaining a check list output in digital coded responding to different analog value inputs of the analog-to-digital converter from 0 to Vpp; calculating to obtain a nonlinear integral error check list of digital code steps corresponding to different analog value inputs of the analog-to-digital converter; and compensating the nonlinear integral error of the analog-to-digital converter by addition of a subtracter, and obtaining accurate outputs of the analog-to-digital converter. The invention effectively reduces pseudo output arising from the nonlinear integral error of the analog-to-digital converter, so as to ensure the accuracy of the output signal of the digital open loop optical fiber gyroscope; and can compensate the nonlinear integral error according to different parameters of the analog-to-digital converter, so as to effectively improve the linearity of the scale factor of the digital open loop optical fiber gyroscope.

Description

technical field [0001] The invention relates to the field of optical fiber sensors in optoelectronic technology, in particular to a method for improving the linearity of the scale factor of an open-loop digital optical fiber gyroscope. More specifically, it refers to a method for improving the linearity of the scale factor of an open-loop digital fiber optic gyroscope by using a subtractor to compensate the integral non-linear error of an analog-to-digital converter. Background technique [0002] The open-loop digital fiber optic gyro system has a simple structure and low cost, but the linearity of the scale factor is not ideal, which directly restricts its application. In principle, the scale factor of the open-loop digital fiber optic gyroscope is a function of the diameter and length of the fiber ring, the gain of the PIN detector, the preamplifier, and the analog-to-digital converter (ADC), and their changes will directly affect the scale factor make an impact. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00G01C19/72H03M1/10
Inventor 程淼胡慧珠舒晓武刘承
Owner ZHEJIANG UNIV
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