Split type optical fiber gyroscope satisfying reciprocity
A fiber optic gyroscope, split technology, applied in the field of fiber optic gyroscope, can solve the problems of heavy weight, large volume of fiber optic gyroscope, sensitive unit volume, weight limit, etc., and achieve the effect of satisfying reciprocity and not causing drift
Inactive Publication Date: 2009-07-08
ZHEJIANG UNIV
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Problems solved by technology
[0004] Because the traditional fiber optic gyroscope gathers the sensitive ring, light source, detector and other components and all the circuit boards together, the size of the fiber optic gyroscope is relatively large and the weight is relatively heavy; There are strict restrictions on the size and weight of sensitive units, which makes traditional fiber optic gyroscopes unable to meet these applications
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[0027] Such as figure 2 What is shown is the second embodiment of the present invention, a split-type fiber optic gyroscope with an optical coupler placed in front. Optical fiber ring 7, Y-waveguide phase modulator 6 and optical coupler 5 form front-end sensitive unit 2, and the two ends of optical fiber ring 7 are respectively connected with two output ends of Y-waveguide phase modulator 6; The input end of Y-waveguide phase modulator 6 passes through optical fiber 17 is connected to one end of the optical coupler 5 . The function of the Y waveguide phase modulator is to split, modulate and polarize the light.
[0028] Signal processing circuit 11, laser light source 4, photodetector 10 and fiber optic gyroscope signal input and output interface 12 form back-end processing unit 1; Connect with the optical fiber 15,16 that the other end of optical coupler 5 in the front-end sensitive unit 2 draws; The signal line 9 is connected to the control terminal of the Y waveguide ph...
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The invention discloses a split fiber optic gyroscope meeting a reciprocal condition. The gyroscope is a critical sensor in an inertial navigation system. A front sensing unit serving as a sensing head of the fiber optic gyroscope comprises a fiber-optic ring and a Y waveguide phrase modulator and has a reserved corresponding optical fiber interface which is first connected with an input interface of a control signal line of a Y waveguide and then connected with a rear end; and a rear processing unit which is mainly used for processing an interference light signal generated by the sensing head, modulating laser to the front processing unit and outputting the laser comprises a signal processing circuit, a gyroscope signal input and output interface, an optical coupler, a laser source and a photodetector and also has an optical fiber interface which is connected with the front sensing unit and the Y waveguide control signal output interface. The invention also adopts another mode that the optical coupler is moved from the rear end to the front sensing unit and meets the same reciprocal condition. On the premise of meeting a reciprocal condition, the fiber optic gyroscope is split, thereby greatly compressing the volume of the front sensing unit.
Description
technical field [0001] The invention relates to an optical fiber gyroscope, in particular to a split type optical fiber gyroscope satisfying reciprocity. Background technique [0002] As the key sensor of the new generation of inertial navigation, fiber optic gyroscope has attracted much attention and developed rapidly because of its unparalleled anti-shock, anti-interference, high precision and large dynamics. Its application range is more and more extensive, and it plays an irreplaceable role especially in occasions where the requirements for precision, volume and weight are relatively harsh and the environment is harsh. However, the traditional fiber optic gyroscope installs sensitive rings, light sources, detectors and other components and all circuit boards in a bracket (cover), which cannot be small enough to meet the growing demand for miniaturization and miniaturization of gyroscopes. demand. [0003] At present, in many inertial navigation systems, there are stric...
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IPC IPC(8): G01C19/72
Inventor 王冬云张立生舒晓武刘承
Owner ZHEJIANG UNIV