Online monitoring method for interference type fiber-optic gyroscope luminous power on the basis of inverse demodulation
A fiber optic gyroscope and optical power technology, which is applied in Sagnac effect gyroscopes, gyroscopes/steering sensing equipment, measuring devices, etc., can solve the problem of adding detection circuits, restricting fiber optic gyroscopes, and improving detection circuit power consumption, volume and Cost and other issues, to achieve the effect of improving the possibility
Active Publication Date: 2018-11-30
BEIHANG UNIV
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These two methods are simple to implement and have high precision. However, with the continuous development of space technology and miniaturized aircraft technology, higher requirements are put forward for the volume, power consumption and weight of space fiber optic gyroscopes. The detection circuit method adds an additional detection circuit, which increases the power consumption, volume and cost of the detection circuit, which does not meet the design requirements of small size and low power consumption for space fiber optic gyroscopes, and the additional effects produced restrict space use. Performance Development of Light and Small Fiber Optic Gyroscope
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[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0023] The fiber optic gyroscope is an angular rate sensitive device. The light source emits a light beam, which is divided into two beams of light with the same phase and opposite propagation directions after passing through the coupler and the phase modulator. If the fiber optic ring rotates, due to the Sagnac effect, the forward / reverse After the two beams of light propagate in the fiber ring, there will be a phase difference, and the light intensity will change when they interfere at the coupler. The photodetector converts the light signal into a voltage signal, and demodulates and detects the light intensity change in the signal processing module. , and then processed to obtain the angular rate information. At present, digital closed-loop technology and square wave modulation are the mainstream technologies of fiber optic gyroscopes. The optical signal i...
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The invention discloses an online monitoring method for interference type fiber-optic gyroscope luminous power on the basis of inverse demodulation. Inverse demodulation is the inverse process of fiber-optic gyroscope angular rate demodulation, angular rate demodulation values in two adjacent demodulation periods are accumulated, and an integral is used for acquiring an inverse demodulation valueprocess; after the inverse demodulation value is subjected to fitting calibration, the current luminous power information of the fiber-optic gyroscope can be acquired. The invention puts forward an inverse demodulation concept for the first time, additional hardware circuits and complex detection programs are introduced into a traditional power monitoring method, an assumption that the luminous power information is directly calculated and extracted in an original gyroscope circuit system is realized, the optimization of a reliable and effective online monitoring method for a spatial fiber-optic gyroscope state is finished, and possibility for further expanding the spatial application of a light-small interference type fiber-optic gyroscope is improved.
Description
technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, and specifically relates to an on-line monitoring method for interference type optical fiber gyroscope optical power based on inverse demodulation. Background technique [0002] Interferometric fiber optic gyroscopes are widely used in military and civilian fields due to their high measurement accuracy, good sensitivity, large dynamic range, small size, light weight, long life, and easy integration. They are used in missile guidance, satellite navigation, attitude control, etc. The orientation plays an important role, and has become a research hotspot all over the world in recent years. Such as figure 1 Shown is a schematic structural diagram of a typical interferometric fiber optic gyroscope, which mainly includes a light source, a beam splitter, a phase modulator, a sensitive fiber optic ring, a detector and a signal processing device. [0003] Different from the fiber optic gy...
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IPC IPC(8): G01C25/00G01C19/72
CPCG01C19/725G01C25/00
Inventor 金靖孔令海马坤贺纪亮张丁
Owner BEIHANG UNIV