13 results about "Fiber optical gyroscope" patented technology

The application relates to the technical field of fiber-optic gyroscopes, in particular to a preparation method of a two-in and two-out mirror image fiber-optic ring, which comprises the following steps: measuring two optical fibers with required lengths; marking the endpoints and the midpoints of the two optical fibers respectively; calculating a winding sequence change point and marking the same on the two optical fibers respectively; winding the two optical fibers on a fiber-optic ring skeleton in a mirror image symmetrical manner alternately by adopting a quadrupole symmetrical winding method until the winding sequence change point; changing the winding sequence of the two optical fibers; repeating steps d and e until the endpoint marks at the two ends of the optical fibers; and leading out four optical fiber tail fibers from the fiber-optic ring skeleton and fixing the same. According to the preparation method of the two-in and two-out mirror image fiber-optic ring, the two optical fiber rings have a mirror image relationship in space, so that the temperature phase errors generated by the two wound optical fiber rings are consistent, the phase errors caused by temperature changes in the Shupe effect can be compensated after joint signal processing, and the precision of the fiber-optic gyroscope is further improved.

The application discloses a high-polarization-extinction-ratio integrated Y waveguide structure based on a thin film lithium niobate, relates to the fields of microwave photonics, integrated optoelectronics and high-precision inertial sensing technology, and comprises a substrate, a lower cladding layer, a thin film lithium niobate layer and an upper cladding layer from bottom to top; and the polarization extinction ratio of the device is significantly improved according to the application; in view of the problem of poor polarization extinction ratio performance of the current monolithic integrated thin film lithium niobate Y waveguide due to the lack of an on-chip efficient polarization structure, the application creatively utilizes mode parity symmetry for filtering; the energy zero point position of the TE1 mode is determined by the waveguide electromagnetic field eigen equation and does not drift with the external environment temperature or stress; unlike the directional coupler relying on nanoscale gaps or the subwavelength grating with a minimum line width; the end-to-end transmission loss of the polarization and filtering of the application can be controlled at a very low level, so that the optical power margin and the overall signal-to-noise ratio of the fiber-optic gyroscope system detection end are significantly improved.

The application discloses a method and device for reducing detection noise of an optical fiber gyroscope. The method comprises: constructing a finite element simulation model of an optical modulator; the simulation model comprises equivalent transverse resistance and capacitance and equivalent longitudinal resistance and capacitance; based on the simulation model, equivalent resistance and capacitance parameters of the optical modulator under different electrode parameters are calculated respectively, and multiple sets of equivalent resistance and capacitance parameters are obtained; the electrode parameters comprise electrode width and electrode spacing; based on each set of equivalent resistance and capacitance parameters, a quantitative relationship between effective modulation signal drift time and drift amount on the optical modulator and the electrode parameters is determined; based on the quantitative relationship, final electrode parameters of the optical modulator under a set requirement are determined; the set requirement comprises a set drift amount and a set drift time. According to the application, the output drift of the optical modulator can be reduced, the reset error of the optical fiber gyroscope can be reduced, and the detection noise of the optical fiber gyroscope can be reduced.

This invention provides a resonant fiber optic gyroscope signal processing system based on FPGA and ARM, including an A / D converter, an FPGA terminal, an ARM terminal, a D / A converter, and a resonant fiber optic gyroscope. The resonant fiber optic gyroscope includes a tunable semiconductor laser, an optical isolator, a beam splitter, a first phase modulator, a second phase modulator, a first circulator, a second circulator, a coupler, a fiber optic ring resonant cavity, a first photodetector, and a second photodetector. The A / D converter receives the photodetector signals from the gyroscope system; the D / A converter outputs the phase modulation signals and laser control signals; and the AXI bus protocol, UART protocol, and TLV protocol are used to control the FPGA output signals, transmit signals from the ARM terminal, and process the gyroscope output data. This invention allows for the control of required parameters and the acquisition, processing, and observation of gyroscope output signals on a host computer, simplifying the parameter debugging process and improving system debugging efficiency.

This utility model relates to a small-volume fiber optic gyroscope north-finding instrument, comprising a housing, inside which a fiber optic gyroscope and an accelerometer are installed. The housing includes an upper cylinder and a lower cylinder, with corresponding connecting ears on the top of the upper cylinder and the bottom of the lower cylinder. The lower cylinder has mounting holes on its wall for installing connectors. An electric turntable is also installed inside the housing. The body of the electric turntable is fixedly mounted on the bottom wall of the lower cylinder by several support rods. A mounting bracket is mounted on the turntable, including a fixed plate on the surface of the turntable and a U-shaped fork arm perpendicular to the fixed plate. The fixed plate is fixedly mounted on the surface of the turntable by screws. The bottom end of the U-shaped fork arm is fixedly connected to the fixed plate, and the top of the U-shaped fork arm is fixedly connected to the base plate of the fiber optic gyroscope by bolts. The accelerometer is also fixedly mounted on the U-shaped fork arm. This small-volume fiber optic gyroscope north-finding instrument is compact, lightweight, and easy to assemble and maintain.

The application discloses an optical fiber gyroscope, a disturbance control method and equipment, relates to the technical field of circuit detection, and the optical fiber gyroscope comprises a wide-spectrum light source, a polarization controller, a polarization maintaining coupler, a polarization beam splitter, a second detector, a third detector and a gyro drive demodulation circuit; the polarization maintaining coupler is connected with the polarization beam splitter in an optical path, and the gyro drive demodulation circuit is electrically connected with the polarization controller; the polarization beam splitter is used for receiving first light waves emitted by the wide-spectrum light source and split by the polarization maintaining coupler, splitting the first light waves again, and sending second light waves split again to the gyro drive demodulation circuit; the gyro drive demodulation circuit is used for generating an adjusting signal based on the second light waves and sending the adjusting signal to the polarization controller; and the polarization controller is used for adjusting the polarization state of incident light based on the adjusting signal. The measurement precision and stability of the gyroscope can be improved.

This invention discloses a method for determining and restoring abnormal saturation of the output of a fiber optic gyroscope sensor. The method includes: responding to a pre-set function enable flag in the fiber optic gyroscope sensor being in an on state, monitoring the current output data of the fiber optic gyroscope; determining whether the fiber optic gyroscope is abnormally saturated based on the relationship between the current output data and a set saturation value; and determining whether to restore the fiber optic gyroscope based on its accumulated reset count in response to abnormal saturation. This application can quickly identify and restore abnormally saturated gyroscopes.

The application discloses a kind of wind generating set blade tip twist monitoring methods, comprising the following steps: S1, sensor, fiber grating and fiber gyroscope are installed at each measuring point of blade tip;S2, after wind generating set is powered on, make fiber gyroscope and sensor record data;S3, data is mediated and filtered;S4, according to the data after processing, construct blade deformation model;S5, based on least square edge model is solved, based on blade stiffness, physical equation is established, and blade deformation data are acquired;S6, according to blade deformation data on different components, the twist amount of blade in the process of rotation can be obtained, and the monitoring of wind generating set blade tip twist is completed;The application can realize the measurement of blade in long-term stability, obtain the twist data of blade tip of super-long blade in the process of operation, solve the problem that original blade root stress monitoring system cannot monitor blade twist.

This invention discloses an intelligent control method for fiber optic winding based on image recognition and data closed-loop, belonging to the field of industrial control technology. The invention synchronously acquires multi-source heterogeneous data such as microscopic and macroscopic winding image sequences, tension, and coordinates; extracts geometric feature anchor points, and quantifies the severity of defects such as micro-gap and wire overlap; within a short period, it integrates visual error and tension feedback to adaptively execute non-stop dynamic correction or constant tension automatic unwinding, avoiding stress abrupt changes caused by manual intervention; within a long period, it establishes a digital twin model of interlayer morphology, feedforwards to compensate for the winding pitch, and eliminates macroscopic thickness collapse; by introducing a reinforcement learning algorithm with a posteriori optical performance as the reward function, it continuously optimizes control parameters. This invention improves the stress uniformity and volume symmetry of the fiber optic ring, and enhances the yield and full-temperature stability of high-precision fiber optic gyroscopes.

The application discloses a kind of based on current drive's fiber-optic gyroscope circuit board crosstalk detection device and method, belong to fiber-optic gyroscope technical field.The device includes light source drive board, wide spectrum light source, coupler, Y waveguide, 1 / 4 wave plate, fiber ring, detector, winding coil and equivalent rotation speed drive module.Equivalent rotation speed drive module applies varying current to the coil wound on fiber ring, and uses Faraday effect to generate varying phase difference in fiber ring, so as to equivalent Sagnac phase difference caused by rotating platform, realize quantitative detection to the measured circuit board crosstalk.The application can complete circuit board level crosstalk test alone without using rotating platform, avoid electromagnetic interference and environmental disturbance introduced by rotating platform, and the size and period of excitation current are controllable, can simulate different precision rotation speed input, with the advantages of low cost, convenient operation, accurate measurement.

FIELD: optoelectronics; precision laser technology.SUBSTANCE: invention can be used for submicron stabilisation of the line of sight of optoelectronic means of space systems. A laser inertial reference device for submicron stabilisation contains a base, an inertial unit, a three-axis fibre-optic gyroscope and a three-axis microelectromechanical accelerometer, an optical unit, a semiconductor laser fixed on a platform, a collimator, two two-axis movable mirrors, the reflective surfaces of which are located parallel at a distance of 50 mm, at an angle of 70° to the direction of the optical axis, a receiving system consisting of two beam splitters, two position-sensitive photodetectors (PSPD) of quadrant photodiodes, as well as an objective in front of one of the PSPDs.EFFECT: reducing weight and dimensions, increasing accuracy and speed due to the use of a system of two two-axis movable mirrors and two position-sensitive photodetectors.3 cl, 2 dwg