Closed-loop differential dual-interference type optical fiber gyroscope based on optical isolator
A technology of fiber optic gyroscope and optical isolator, which is applied in the direction of Sagnac effect gyroscope, etc., can solve the problems of dynamic range, non-linearity, affecting the practicality of differential double interference fiber optic gyroscope, etc. Scale factor stability and environmental adaptability, the effect of simple solution method
Active Publication Date: 2015-01-07
BEIHANG UNIV
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Problems solved by technology
At present, the differential double interference fiber optic gyroscope adopts an open-loop scheme, which has problems such as corresponding nonlinearity, susceptibility to environmental influences, and small dynamic range, which seriously affects the practical application of the differential double interference fiber optic gyroscope.
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[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0025] The present invention is a closed-loop differential dual-interference fiber optic gyroscope based on an optical isolator, such as figure 1 As shown, it includes a light source 1, a first coupler 2, an optical fiber ring 8, a second coupler 3, a first isolator 4, a second isolator 7, a waveguide 5, a third coupler 6, a polarization beam splitter 9, a first detector 10 and a second detector 11;
[0026] A of light source 1 and first coupler 2 1 The port is welded at 45° to the melting point O 1 , C of the first coupler 2 1 port of the second coupler with 3 A 2 The port is welded at 0° at the melting point O 2 , the B of the second coupler 3 2 The port and one end of the first isolator 4 are welded at 0° at the melting point O 3 , the other end of the first isolator 4 is welded to the waveguide 5 at 0° at the melting point O 5 , the other end of t...
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The invention discloses a closed-loop differential dual-interference type optical fiber gyroscope based on an optical isolator. The closed-loop differential dual-interference type optical fiber gyroscope comprises a light source, a first coupler, an optical fiber ring, a second coupler, a first isolator, a second isolator, waveguide, a third coupler, a polarization beam splitter, a first detector and a second detector. The closed-loop control of the differential dual-interference type optical fiber gyroscope is realized. Furthermore, the laser light source with better wavelength stability is used, so that the scale factor stability and the environmental suitability of the optical fiber gyroscope can be improved. An SAGNAC phase calculating method provided by the invention is simple.
Description
technical field [0001] The invention relates to a closed-loop differential double-interference optical fiber gyroscope which realizes SAGNAC effect multiplication and closed-loop control under the condition that the area of the optical fiber ring and the length of the optical fiber are constant, and belongs to the technical field of optical fiber gyroscopes. Background technique [0002] As a new type of inertial angular velocity sensor that is developing extremely rapidly, fiber optic gyroscope has its unique technical and performance advantages, such as all-solid-state structure, high reliability, long life; fast start-up speed, short response time; large measurement range and wide dynamic range ; Anti-shock, vibration, chemical corrosion resistance; small size, light weight, low cost; suitable for mass production, etc., have been widely used in various fields. [0003] The commonly used form of fiber optic gyroscope in the world is the single interference type, that is,...
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IPC IPC(8): G01C19/72
Inventor 张春熹滕飞徐宏杰徐小斌肖智杜士森张祖琛
Owner BEIHANG UNIV