A kind of angular velocity measurement method of fiber optic gyroscope
A fiber optic gyroscope and angular velocity detection technology, which is applied in the field of gyroscopes, can solve the problems of deteriorating detection sensitivity, affecting the short-term wandering performance of the gyroscope, and uneven noise spectrum, so as to reduce the noise floor, improve short-term wandering performance, reduce The effect of phase error
Active Publication Date: 2022-08-05
PEKING UNIV
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However, after analyzing the noise spectrum by collecting the interference signals of the two beams of light, it is found that the noise spectrum is not flat, and the low-frequency noise is obviously higher than the high-frequency part, such as Figure 4 shown
Therefore, for a large fiber optic ring (its length is 30km and its eigenfrequency is 3.3kHz), its modulation frequency will be much lower than that of a small fiber optic ring, and it will fall into Figure 4 The low-frequency part with high 1 / f noise shown will greatly affect the short-term wandering performance of the gyroscope and degrade the detection sensitivity. The influence of 1 / f noise cannot be ignored in ultra-large and high-precision fiber optic gyroscopes
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[0059] Below will be described in detail to describe the examples of this disclosure in detail. Although the exemplary embodiments are displayed in the attached figure, it should be understood that it can be implemented in various forms and should not be limited by the embodiments described here. Instead, these embodiments are provided to be able to more thoroughly understand the disclosure and be able to pass the scope of publicly to the technical personnel in the art.
[0060] It should be noted that unless otherwise explained, the technical terms or scientific terms used in this application should be understood by the technical personnel of this application in this application.
[0061] In addition, the term "first" and "second" are used to distinguish different objects, not to describe a specific order. In addition, the term "including" and "having" and any deformation of them intended to cover his inclusion. For example, it contains a series of steps or units of processes, me...
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The present application provides a method for detecting the angular velocity of a fiber optic gyroscope, comprising: generating at least one group of detection lights, each group of the detection lights including a bundle of clockwise light transmitted clockwise in the fiber optic gyroscope and a bundle of clockwise light in the fiber optic gyroscope Counterclockwise light transmitted counterclockwise; phase modulation is performed on each group of clockwise light and counterclockwise light by using a modulation signal of a predetermined frequency, which is determined according to the noise spectrum curve of each group of clockwise light and counterclockwise light transmitted in the fiber optic gyroscope Predetermined frequency; collect the interference signal of each group of clockwise light and counterclockwise light, and obtain the angular velocity detection result according to the interference signal. In the present application, the frequency of the modulated signal is set in the broadband noise frequency band, which can greatly reduce the noise floor and improve the short-term walking performance of the fiber optic gyroscope. At the same time, the influence of the smearing effect will be reduced due to the separation of the frequency points, which can greatly reduce the phase error caused by 1 / f noise, improve the short-term walking performance of the fiber optic gyroscope, and enable ultra-high precision Fiber optic gyro indicators have entered a new level.
Description
Technical field [0001] This application involves the field of gyroscope technology, which specifically involves an angle speed detection method for an optical fiber gyroscope. Background technique [0002] The fiber gyroscope is a sensor that measures an inertial movement of an object. Due to its high accuracy, stable performance, good reliability, strong anti -interference ability and long life, it is widely used in the fields of missiles, aerospace, aerospace, navigation and other fields. [0003] The basic working principle of optical gyroscope is: When the two tracts of the same characteristics in the closed light road are transmitted along the direction of the direction of the clockwise (CW) direction (CW), respectively, if the light path is rotated, the two beams of light will produce and and The phase difference correlation between the rotating angle speed, so that the turning angle speed of the closed light path can be obtained based on the interference signals of the two...
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IPC IPC(8): G01C19/72
CPCG01C19/721
Inventor操玉文何动张丁凡周桐阳春霞曾卫益朱兰鑫陈彦钧李正斌蒋云
OwnerPEKING UNIV