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Measuring method for fiber optic gyroscope eigenfrequency

An eigenfrequency and fiber optic gyroscope technology, which is applied to measuring devices, Sagnac effect gyroscopes, instruments, etc., can solve the problems of low precision and difficulty in guaranteeing the measurement accuracy of eigenfrequency

Active Publication Date: 2012-12-26
BEIHANG UNIV
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Problems solved by technology

The existence of these factors makes it difficult to guarantee the measurement accuracy of the characteristic frequency
[0004] Aiming at the problems existing in the current eigenfrequency measurement, Wang Xi et al. proposed a measurement method of 2 times the eigenfrequency square wave phase modulation, but its accuracy is low

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  • Measuring method for fiber optic gyroscope eigenfrequency
  • Measuring method for fiber optic gyroscope eigenfrequency
  • Measuring method for fiber optic gyroscope eigenfrequency

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Embodiment Construction

[0056] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0057] A fiber optic gyroscope eigenfrequency measurement system based on even frequency multiplied eigenfrequency square wave phase overmodulation such as Figure 4 As shown, the optical path used by the measurement system is exactly the same as the optical path of the actual gyroscope. This part of the optical path includes light source, coupler, Y waveguide, fiber ring, and photodetector. The light source adopts ASE fiber optic light source, and the light detector adopts PIN-FET components. The output of the light source is connected to the port A of the coupler, the port C of the coupler is connected to the Y waveguide, and the Y waveguide is fused with the fiber ring, and the port B of the coupler is connected to the optical detector PIN-FET. The laser driver provides constant drive for the ASE fiber light source, the modulation signal of...

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Abstract

The invention provides a measuring method for fiber optic gyroscope eigenfrequency, which is based on the fiber optic gyroscope eigenfrequency measuring system of even double frequency eigenfrequency square wave phase overmodulation, wherein the light path adopted by the measuring system is completely identical with that of the actual gyroscope; and the typical light path includes a light source, a coupler, a Y waveguide, a fiber loop and a photoelectric detector. Compared with the existing method, the measuring method reduces the strict requirements for the square wave modulated signal quality, has the advantages of simple method, low cost and easiness for realization, and can greatly improve the measuring precision of the eigenfrequency on the basis that the existing gyroscope does not require additional hardware.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a method for measuring the eigenfrequency of an optical fiber gyroscope, which can be used for measuring the eigenfrequency of an optical fiber gyroscope with an accuracy of inertial navigation level and below. Background technique [0002] The eigenfrequency of the fiber optic gyroscope is a very important parameter in the fiber optic gyroscope. The eigenfrequency is defined as f p =1 / 2τ, where τ is the time for light to travel in the fiber ring. Fiber optic gyroscopes generally use a square wave signal whose frequency is equal to the eigenfrequency to modulate it. When the modulation frequency is not equal to the eigenfrequency, modulation errors will be introduced, which will affect the working characteristics of the fiber optic gyroscope. Adjusting the modulation frequency at the eigenfrequency point, the error source can be effectively reduced or eliminated, ...

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Application Information

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IPC IPC(8): G01C25/00G01C19/72G01J11/00
Inventor 杨明伟杨远洪汪磊索鑫鑫吴长莘
Owner BEIHANG UNIV
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