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Fiber-optic gyroscope and relative intensity noise suppression device and method thereof

A relative intensity noise, fiber optic gyroscope technology, applied in measurement devices, Sagnac effect gyroscopes, gyroscopes/steering sensing devices, etc., can solve high cost, complex structure, noise suppression cost-effective, limited cost-effective ratio, etc problem, to achieve the effect of low cost, simple structure and high cost-effectiveness ratio

Pending Publication Date: 2020-10-16
HUNAN AEROSPACE ELECTROMECHANICAL EQUIP & SPECIAL MATERIAL INST
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Problems solved by technology

However, the above-mentioned suppression processing methods all have the characteristics of high cost and complex structure, which in turn results in very limited cost performance and cost-effectiveness ratio of noise suppression.

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  • Fiber-optic gyroscope and relative intensity noise suppression device and method thereof

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Embodiment Construction

[0028] The technical solutions in the present invention are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] Such as figure 1 As shown, a fiber optic gyroscope relative intensity noise suppression device provided by the present invention includes a wide-spectrum light source, a fiber coupler, a Y waveguide, a polarization-maintaining fiber ring, a photodetector, a fiber attenuator and a fiber Faraday rotating mirror, and has a wide The output end of the spectrum light source is connected to the input end of the fiber coupler, the input and output ends of the fiber coupler are...

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Abstract

The invention discloses a fiber-optic gyroscope and a relative intensity noise suppression device and method thereof. A path of redundant light is led out by utilizing the blind end of an optical fiber coupler, the redundant light is reflected back to the optical fiber coupler after being attenuated twice by an optical fiber attenuator and rotated by 90 degrees through polarization of an optical fiber Faraday rotation reflector, and in the optical fiber coupler, the signal light and the reflected and attenuated light are subjected to intensity superposition and do not interfere with each other, so that the purpose of reducing relative intensity noise is achieved. According to the device, on the basis of only utilizing the idle blind end of the optical fiber coupler, an optical fiber attenuator and a single-mode optical fiber Faraday rotating reflector are additionally arranged, so that the suppression purpose can be achieved, the structure is simpler, the cost is low, the advantage ofhigh cost-effectiveness ratio of noise suppression is achieved, and the device has important application and popularization value.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, and in particular relates to a fiber optic gyroscope relative intensity noise suppression device and method based on a fiber optic attenuator and a Faraday rotating mirror. Background technique [0002] The relative intensity noise of fiber optic gyroscope has become an important noise source in high precision fiber optic gyroscope. The researchers propose that a light source with low relative intensity noise is important for the noise level of a high-precision fiber optic gyroscope. Under the same light source conditions, in order to obtain low-noise and high-precision fiber optic gyroscopes, researchers have also continuously studied and proposed various relative intensity noise suppression methods. For example, two photodetectors are used to separate the light from the light source for direct intensity detection, and then the analog optical signal is transmitted to the digital ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/72
CPCG01C19/725
Inventor 张学亮于中权刘智荣王珊珊
Owner HUNAN AEROSPACE ELECTROMECHANICAL EQUIP & SPECIAL MATERIAL INST
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