MZ resonance interference principle optical fiber gyro
A fiber optic gyroscope and gyroscope technology, applied in the direction of instruments, optical devices, measuring devices, etc., can solve the problems of low precision and sensitivity, and achieve the effect of high precision, high sensitivity and high cost performance
Inactive Publication Date: 2008-09-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0006] The interference gyroscope based on the principle of MZ interference also has inherent shortcomings, and its accuracy and sensitivity are lower than those of the resonant fiber optic gyroscope.
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[0034] specific implementation
[0035] refer to figure 1 , is a schematic structural diagram of a single-axis MZ resonant interferometric fiber optic gyroscope according to an embodiment of the present invention. The present invention adopts the principle of MZ multi-beam interference between two-arm symmetrical double-cycle beams. The laser 1 with a wavelength of 0.8μm∽1.6μm emitted from a relatively high-power LD semiconductor laser or fiber laser enters a single-mode fiber with an isolator and is split by a 3dB coupler 2 before being sent to the MZ input coupler 3. Two inputs The light enters the ports a and b' of the two optical fiber signal arms S1 and S2 of the MZ in the form of cross-coupling in the coupler 3, and the two optical fiber signal arms are wound in parallel to form an optical fiber sensing coil 3, and the optical signals are respectively transmitted from the port a' of the S1 arm and the port of the S2 arm b enters the coupler 4, a small part of the two-...
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The invention relates to a fiber optic gyroscope of the MZ resonance interference principle, comprising a light source, a coupler, an optical detection device and a sensing coil of MZ interference with two optic fiber arms enwound in parallel; ports b' and b of an optic fiber arm S1 are respectively butted to a port P4 of a coupler 7 and a port P2 of a coupler 3; ports a and a' of an optic fiber arm S2 are respectively butted to the port P1 of the coupler 3 and a port P3 of the coupler 7, thus leading two arms of MZ to form a ring cavity; the port P1 and the port P3 of the coupler 3 are respectively butted to the port P2 and the port P3 of a coupler 2; the port P1 and the port P2 of the coupler 7 are respectively butted to the ports P1 and P4 of a coupler 8; the fiber optic gyro also comprises an isolator between the light source and the coupler 2; the ports P2 and P3 of the coupler 8 are respectively connected with an optical detection device 9; the fiber optic gyroscope adopts the principle of MZ multi-beam interference between the dual-circle optical beams with symmetrical two arms, realizes extremely long optical path with rotation angular velocity signals by shorter optic fiber arms, and outputs the light containing no rotation information.
Description
Technical field [0001] The invention relates to an optical fiber gyroscope, in particular to an optical fiber gyroscope based on the principle of MZ resonance interference. Background technique [0002] Fiber optic gyroscope is a new type of all-solid-state inertial instrument without mechanical rotor. It has the advantages of long life, fast start-up, high precision, and wide dynamic range. It plays a key role in aerospace, weapon navigation and other fields. At present, fiber optic gyroscopes mainly adopt two schemes: interferometric fiber optic gyroscope (IFOG) and resonant fiber optic gyroscope (RFOG) based on the Sagnac principle. The interferometric fiber optic gyroscope is relatively mature. In order to improve the detection accuracy of the system and reduce noise, a superluminescent light source (SLD) and a polarization-maintaining fiber coil with a length of several hundred meters are used, which also brings a large volume and weight of the system and a stable syste...
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Inventor 张利勋刘永智彭增寿欧中华代志勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA