Angular velocity measuring device based on tunable optoelectronic oscillator

Abstract

The invention provides an angular velocity measuring device based on a tunable optoelectronic oscillator. The angular velocity measuring device comprises a laser source, a first polarization controller, an electro-optic modulating element, an optical circulator, a second polarization controller, a first polarization beam splitter / combiner, a Sagnac ring, a dispersion element, a third polarizationcontroller, a second polarization beam splitter / combiner, a fourth polarization controller, a fifth polarization controller, a first segment of optical fiber, a second segment of optical fiber, a third polarization beam splitter / combiner, a photoelectric detector, a microwave amplifier, and a power divider. According to the angular velocity measuring device, the Sagnac interferometer is embedded into a microwave photonic filter, so that phase change caused by Sagnac effect is converted into the center frequency of the microwave photonic filter, and change of optoelectronic oscillator output microwave signal frequency is induced. The tunable range of the microwave photonic filter is usually at GHz scale, and the optoelectronic oscillator is capable of generating high quality microwave signals, so that the system is capable of increasing angular velocity measuring sensitivity, and widening the dynamic range at the same time.

Description

technical field [0001] The invention relates to the technical field of optical gyroscopes, in particular to an angular velocity measuring device based on a tunable photoelectric oscillator. Background technique [0002] As an important aspect of inertial technology, angular velocity measurement plays a huge role in the fields of military, industrial and civil navigation. The discovery of the Sagnac effect laid a theoretical foundation for the development of optical gyroscopes. The Sagnac effect points out that the two beams of light propagating forward and backward along the closed optical loop will produce a phase difference when the loop rotates, and the phase difference is proportional to the angular velocity of the loop rotation, the expression is [0003] [0004] Among them, A is the area of ​​the closed optical loop; λ is the wavelength of the two beams of light; n is the refractive index of the medium that makes up the optical loop; c is the propagation speed of l...

AI Technical Summary

Problems solved by technology

[0008] In addition, for the measurement system, high sensitivity and large dynamic range are generally contradictory. In actual use, you need to make a trade-off between sensitivity and dynamic range according to your own needs, which will bring a lot of inconvenience. Therefore, research Gyroscopes with high sensitivity and large dynamic range are of great significance

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