Hollow photonic crystal fiber gyroscope

A hollow-core photonic crystal, fiber optic gyroscope technology, applied in cladding fibers, optical waveguides, Sagnac effect gyroscopes, etc. To achieve the effect of convenience, small size and high reliability

Inactive Publication Date: 2009-03-18
BEIHANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a resonant optical fiber gyro instrument device with a resonant ring composed of a hollow-core photonic crystal fiber; Problems of poor temperature stability, magnetic sensitivity and high noise, and better radiation resistance

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] The hollow-core photonic crystal fiber optic gyro of the present invention consists of an adjustable narrow linewidth laser 4, an integrated optical modulator 5, a first detector 6 and a second detector 7, a first polarization-maintaining fiber coupler 8 and a second polarization-maintaining optical fiber A coupler 9, an optical coupling module 11, and a hollow-core fiber resonant ring 12, the structure of which is shown in figure 2 As shown; all devices are connected through polarization-maintaining fiber; the laser emitted from the adjustable narrow linewidth laser 4 is divided into two equal parts after passing through the integrated optical modulator 5, and passes through the first polarization-maintaining fiber coupler 8 and the second polarization-maintaining fiber coupler respectively. The polarized fiber coupler 9 enters the optical coupling m...

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Abstract

The invention relates to a hollow photonic crystal optical fiber gyro, which is characterized in that a hollow optical fiber resonant ring coiled by hollow photonic crystal optical fibers is adopted; laser light emitted by a tunable narrow linewidth laser is divided into two equal parts by an integrated optical modulator; the two parts enter an optical coupling module respectively through two polarization-maintaining fiber couplers, then are output from the optical coupling module and injected into the hollow optical fiber resonant ring; a convex spherical mirror adopted by the optical coupling module has high reflectivity and transmissivity, and a resonant cavity for the gyro is formed between the optical coupling module and the hollow optical fiber resonant ring to realize input and output of light; a small part of harmonic light penetrates the resonant cavity and returns to two detectors respectively through two polarization-maintaining fiber couplers, frequency difference of the harmonic light in the clockwise / anticlockwise direction is measured according to signals detected by the two detectors, and the angular speed of a carrier can be obtained through a testing circuit, so as to realize the function of a gyroscopic instrument. The optical fiber gyro has the advantages of small volume, convenient realization, high reliability, high radiation-resistant capacity and suitability of space application.

Description

technical field [0001] The invention relates to an optical gyro instrument, in particular to a resonant optical fiber gyro instrument using a hollow-core photonic crystal fiber. Background technique [0002] Fiber optic gyroscope is an all-solid-state, truly silent gyroscope, which has the characteristics of high reliability, long life, wide dynamic range, shock resistance, vibration resistance, small size, light weight, suitable for mass production, etc., and can achieve high precision . However, for engineering applications, fiber optic gyroscopes still have problems such as temperature sensitivity, high noise, magnetic sensitivity, and poor radiation resistance. These problems can be better solved by optimizing the structure and thermal design, finer winding of the fiber optic ring, more perfect signal detection scheme and effective shielding technology, but these technologies and measures also make the fiber optic gyroscope more complicated and impossible. Get good res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/72G02B6/02G02B6/26
Inventor 杨远洪段玮倩杨巍马游春
Owner BEIHANG UNIV
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