9 results about "Fibre optic gyroscope" patented technology

The application discloses a kind of time division multiplexing three-axis wide spectrum light source resonant type fiber-optic gyroscope detection systems and methods, belong to gyroscope optical system design field.System is constituted by optical system and signal detection system, and optical system includes a wide spectrum light source, a push-pull Y waveguide, a circulator, three mutually orthogonal transmission type fiber ring resonant cavity, two sections of delay optical fiber and a photoelectric detector;Signal detection system includes modulation and demodulation module, time division decoupling module and low-pass filter module.Three transmission type fiber ring resonant cavities are sequentially connected, and the time of optical signal reaching three fiber ring resonant cavities is different by being set delay optical fiber between adjacent two transmission type fiber ring resonant cavities.The application ingeniously designs three fiber ring resonant cavities to form three-axis integrated structure.In this way, the time difference of three-axis signals is utilized, and multiplexing in time domain can be realized without adding additional devices.

A dual interferometer fibre optic gyroscope, comprising: a first optical interferometer comprising a first reference optical fibre and a first delay optical fibre wherein light in the first delay fibre experiences an optical delay with respect to the first reference fibre; a second optical interferometer comprising a second reference optical fibre and a second delay optical fibre wherein light in the second delay fibre experiences an optical delay with respect to the second reference fibre; wherein the first and second reference optical fibres are common; wherein the first and second delay optical fibres are common; and wherein the first and second reference optical fibres are not common with the first and second delay optical fibres.

The present invention relates to the field of optical fiber technology, and particularly to a method for manufacturing a decoherence optical fiber. The present invention discloses a method for manufacturing a decoherence optical fiber, which includes the following steps: S1, take a conventional optical fiber, the core of which is a cylindrical structure; S2, randomly twist the conventional optical fiber along its axis in units of a certain length, and the twisting is performed with the core axis of the core as the self-rotation axis. The optical fiber structure manufactured by the present invention can disrupt the coherence of the transmitted light to achieve the output of broadband flat light, meet the requirements of optical fiber gyroscopes and the like for broadband light sources, and has a simple manufacturing process, is easy to implement, and has a low cost.

The invention discloses a method for determining and recovering abnormal output saturation of a fiber-optic gyroscope sensor. The method comprises the following steps: monitoring current output data of a fiber-optic gyroscope based on the fiber-optic gyroscope in response to a preset function enabling mark in a fiber-optic gyroscope sensor and the mark being in an open state; judging whether the optical fiber gyroscope is abnormally saturated or not based on the relationship between the current output data and a set saturation value; and in response to the abnormal saturation of the optical fiber gyroscope, determining whether to recover the optical fiber gyroscope or not based on the accumulated reset times of the optical fiber gyroscope. According to the method and the device, the abnormal saturated gyroscope can be quickly identified and recovered.

The present disclosure relates to integrating an integrated photon-based optical gyroscope and an optical fiber-based optical gyroscope into a portable device that may include a compass feature. The novel small-occupied-space modularized fully-integrated photon optical gyroscope is used for a non-key axis. However, for at least one key axis, a fiber optic gyroscope may be used to provide a bias stability of less than 0.1 DEG / hour that is directly related to positioning accuracy over a predicted centimeter range. The positioning accuracy comes from the compass positioning capability of a gyroscope (called a gyro compass) for calculating the course by utilizing the rotation of the earth.

The present invention proposes a fiber optic gyroscope, which relates to the field of gyroscopes. The device comprises a housing, a light source mounted within the housing, a first coupler, and three groups of fiber optic gyroscopes. Light emitted by the light source is divided into three beams by the first coupler and enters the three groups of fiber optic gyroscopes respectively. Each group of fiber optic gyroscopes comprises a second coupler, a Y-waveguide, an optical fiber ring, a photodetector, and a signal processing circuit, which are connected in sequence. The device utilizes integrated sampling design technology in fiber optic inertial navigation, whereby a single light source drives three fiber optic gyroscopes. This effectively solves the problems of light source stability and parameter consistency, and overcomes the cross-interference resistance of three-axis multiplexed optical paths. Key technologies include miniaturized integration technology and rapid startup of fiber optic gyroscopes. This reduces costs, reduces volume, shortens system startup time, improves system reliability, and provides vibration and shock resistance.

The utility model relates to the field of laser deflection instrument discloses a new laser deflection instrument, including laser dynamic deflection car main part, a plurality of working wheels are installed to the laser dynamic deflection car main part outside, the laser dynamic deflection car main part outside is installed with the optical fiber gyro main part, the laser dynamic deflection car main part outside is provided with cleaning assembly, the laser dynamic deflection car main part top is provided with detection assembly, the cleaning assembly includes the protective shell, the protective shell outside fixedly connected in the laser dynamic deflection car main part top, the protective shell inner wall is fixedly connected with motor. In the utility model, the rotating shaft is driven by motor to drive the rotating disc to rotate, makes L type rod reciprocating sliding in the limiting block through the connecting piece, axle, and the spring in the shell keeps the brush plate in contact with the road surface, realizes the sustained cleaning to the measured ground, avoids the sundries interference laser light path, ensures the accuracy of deflection detection data and the continuous work ability of equipment.

Systems and methods for compensating optical lead fluctuations in an RFOG include sources for generating first and second optical signals; an optical resonator; first and second lead lines connected to the sources and the resonator, wherein the sources couple the first and second optical signals into the first and second lead lines, and the first and the second lead lines couple the first and second optical signals into the optical resonator for propagation within the optical resonator in opposite directions; a tapping device coupled to the optical resonator that couples portions of the first and second optical signals out of the optical resonator; a combiner that combines the portions of the first and second optical signals to produce a combined output; and a photodetector that generates a beat note signal from the combined output.

Systems and methods for compensating optical lead fluctuations in an RFOG include sources for generating first and second optical signals; an optical resonator; first and second lead lines connected to the sources and the resonator, wherein the sources couple the first and second optical signals into the first and second lead lines, and the first and the second lead lines couple the first and second optical signals into the optical resonator for propagation within the optical resonator in opposite directions; a tapping device coupled to the optical resonator that couples portions of the first and second optical signals out of the optical resonator; a combiner that combines the portions of the first and second optical signals to produce a combined output; and a photodetector that generates a beat note signal from the combined output.