A Circular Interference Optical Gyroscope Based on Directional Coupled Modulator
A technology of directional coupling and optical gyroscope, which is applied to Sagnac effect gyroscopes, gyroscopes/steering sensing equipment, instruments, etc., can solve the problems of useful optical signal loss, limited precision improvement, and low number of optical cycles, etc., to achieve Effects of increasing detection light intensity, reducing extra loss, and improving performance
Active Publication Date: 2017-04-12
HARBIN ENG UNIV
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However, such processing alone is not enough, no matter how the coupling ratio of the coupler is selected, the useful optical signal required by the system will be seriously lost, which will eventually cause the light intensity detected by the photodetector to be very weak, or even be regarded as a strong The noise signal is filtered out
In the existing circular interference optical gyro scheme, the number of light cycles is small, which limits its accuracy improvement
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[0023] Attached below Figure 1-5 The present invention is further described with embodiment:
[0024] The present invention utilizes a directional coupling modulator and a corresponding modulation and demodulation scheme to design a novel circular interference optical gyroscope.
[0025] The directional coupling modulator used is an optical waveguide modulator with a material having physical effects such as electro-optic and acousto-optic as a substrate, and can obtain a cross state and a straight-through state by adjusting the working voltage.
[0026] When the optical pulse signal reaches the optical path, the directional coupling modulator is modulated to the cross state until all the optical pulses enter. After multiple cycles in the middle cycle, the directional coupling modulator is modulated to the cross state at this time until all optical signals are output.
[0027] A circular interference optical gyroscope based on a directional coupling modulator is realized thr...
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The invention relates to a circulating interference type optical gyroscope of an interference type optical gyroscope which is suitable for the operation principle of circulating re-enter. The circulating interference type optical gyroscope is based on an orientation coupling modulator. According to the invention, light source is modulated to a group of pulse signals, wherein the pulse width is the transit time tau of the light in a light path coil SSR, tau equals L / c and c is the speed of light; if needed circulation times is n, the period is modulated to n * Tau and a Pi / 2 square wave modulating signal is applied at the waveguide position of a system Y with the modulating period equals 2 * Tau; when light pulse of which the pulse width is the transit length of the light path reaches the position of the orientation coupling modulator, the orientation coupling modulator is modulated to an intersected state till the light pulse completely enters into the light path. According to the invention, the detection accuracy of the circulating interference type optical gyroscope is improved.
Description
technical field [0001] The invention relates to a circular interference optical gyroscope based on a directional coupling modulator, which is suitable for an interference optical gyroscope whose working principle is a circular reentrant type. Background technique [0002] The fiber optic gyroscope is an angular velocity sensor based on the Sagnac effect, and is widely used because of its solid-state structure and large dynamic range. With the development of fiber optic gyroscopes, the demand for fiber optic gyroscopes has increased, and the research on high precision, miniaturization and integrated optical gyroscopes of fiber optic gyroscopes has become a development trend. It can be known from the Sagnac effect that the longer the length of the sensitive optical path, the higher the accuracy of the fiber optic gyroscope, but at the same time, the sensitivity of the fiber optic gyroscope to temperature will also increase, which hinders the further improvement of the accuracy...
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IPC IPC(8): G01C19/66
CPCG01C19/725
Inventor 张勇刚孙娜李宁梁宏姜见龙张丽丽
Owner HARBIN ENG UNIV