56 results about "Fiber coil" patented technology

The invention provides an integrated temperature control fiber-optic gyroscope chip, method and system. The fiber-optic gyroscope chip integrated with temperature control comprises a signal transceiving unit, a gyroscope modulation unit, an optical signal processing unit, an optical fiber coil interface unit and an on-chip temperature-sensitive micro-ring resonant cavity, and the signal transceiving unit is used for forming an optical signal according to a light source; the on-chip temperature-sensitive micro-ring resonant cavity is used for forming a first transmission spectrum according to the optical signal; the gyro modulation unit is used for generating a modulation electric field in response to the modulation driving signal so as to perform phase modulation on the optical signal; the optical signal processing unit is used for performing polarization and beam splitting on the modulated optical signal to form a first path of optical signal and a second path of optical signal; and the optical fiber coil interface unit is used for transmitting the first path of optical signal and the second path of optical signal to a polarization maintaining optical fiber coil to form a gyroscope interference optical signal and outputting the gyroscope interference optical signal, so that a gyroscope detector obtains a compensated gyroscope output result according to the gyroscope interference optical signal.

The invention discloses a fiber arrangement structure of a three-axis integrated fiber-optic gyroscope, and relates to the technical field of three-axis integrated fiber-optic gyroscope design, the fiber arrangement structure comprises a fiber-optic gyroscope table, a fiber-optic ring, a shock absorber and a groove are arranged on the fiber-optic gyroscope table, the groove is composed of an annular fiber coiling area, a through hole and a surface wiring groove and is used for standardizing a fiber path, a traditional fiber coiling cavity is cancelled, and the fiber coiling area is increased; the peripheral space of the optical fiber ring is used for fiber coiling and layout, the overall framework is optimized, the problems of non-standard optical fiber routing and mass center control are solved, the optical fiber ring is suitable for miniaturized products, and the overall size is reduced.

The present application belongs to the technical field of material transportation equipment, and particularly relates to a fiber coil transportation device based on chain link plate variable distance, which comprises densely arranged feeding transportation power modules, equidistantly arranged production transportation power modules, a hanging assembly, a three-claw wire clamping disc, a sensor, a hanging rail, a main frame, a double-bar gate, a power connection module and an L-shaped push plate and the like. The L-shaped push plate on the chain pushes different positions of the hanging assembly to realize automatic conversion of the fiber coil from dense arrangement to equidistant arrangement. The double-bar gate drives the stop block to alternately act through a cylinder to realize one-by-one separation and transportation of the assembly. The power connection module uses an elastic polyurethane push rod to ensure transportation continuity. The three-claw wire clamping disc provides stable and reliable clamping function. The present application realizes efficient transportation of the fiber coil and significantly improves the automation level and transportation efficiency of the fiber connector production line.

A distributed fiber optic sensing (DFOS) / distributed acoustic sensing (DAS) system and method employing a fiber optic sensor cable that collects vibrational data of individual utility poles suspending the fiber optic sensor cable and stores the vibrational data in a central office (CO). Machine learning (ML) models are developed, trained, and utilized to analyze vibrational features of the utility poles and determine their integrity. Additionally, DFOS / DAS systems and methods according to the present disclosure determine the location(s) of fiber coils that exist along a length of a fiber optic sensor cable.

System for manufacturing a fiber optic coil of a gyroscope including a mandrel with relative actuation for forward and reverse rotation, a robotic arm equipped with a first nib, in the terminal part, in which the first nib has an elongated and partially flexible shape to guide the positioning of the optical fiber during its winding on the mandrel, one more optical mechanisms arranged to continuously acquire images of the coil during the winding process, a processor operationally connected with the robotic arm, with the one or more optical mechanisms and with the actuator of the rotation of the mandrel, in which the processor is configured to control the robotic arm and to define a mechanism for controlling the actuator of the mandrel rotation as a function of the continuously acquired images, so as to control the manufacturing of the optical fiber coil.

The invention discloses a submarine cable temperature stress state simulation experiment device and method. The device integrates an optical fiber coil assembly, a temperature displacement simulation box, a stretching mechanism, a wave making circulation cavity and a distributed optical fiber sensing system. The same submarine cable sample is subjected to adjustable temperature in a temperature control bath, axial strain is applied and measured by a stretching mechanism, a wave making circulation cavity reproduces periodic / aperiodic ocean current impact through a wave making plate, a driving paddle and a wave suppression grid, temperature, strain and flow field multivariable synchronous or independent loading is achieved, a distributed optical fiber sensing system obtains Brillouin frequency shift of the same section, and the Brillouin frequency shift is subjected to temperature control. And calibrating temperature and strain coefficients. The problem of signal aliasing errors caused by the fact that an existing experimental device can only test in a single-variable and segmented mode is solved, and the reliability and precision of submarine cable temperature stress monitoring by the BOTDR are improved.

A fiber optic gyroscope includes an optical fiber coil, at least one optical circuit, and at least one optical gate. The at least one optical circuit is configured to receive input optical signals generated by at least one optical source, to split each input optical signal into first and second optical signals, to phase modulate one or both of the first and second optical signals, to transmit the first and second optical signals to the optical fiber coil such that the first and second optical signals counterpropagate through the optical fiber coil, to receive the first and second optical signals after counterpropagating through the optical fiber coil, to combine the first and second optical signals after counterpropagating through the optical fiber coil, and to transmit the combined first and second optical signals to at least one photodetector. The at least one optical gate is configured to controllably time modulate the input optical signals and / or the first and second optical signals prior to being combined, said time modulating synchronized with said phase modulating.

Disclosed herein are optical amplifier devices, optical amplifier assembly, and optical amplifier systems. Example embodiments may include: a plurality of input optical ports, each being configured to receive one of a plurality of input optical signals; a plurality of output optical ports, each being configured to output one of a plurality of output optical signals; a plurality of tap photodiodes, each respectively being connected to one of the plurality of input optical ports and the plurality of output optical ports; a wavelength division multiplexer configured to receive the input optical signal from each of the plurality of input optical ports and an optical input from a laser pump device and output a plurality of pumped optical signals; a plurality of erbium-doped fiber coils, each having a first end configured to receive one of the plurality of pumped optical signals and a second end configured to output an amplified optical signal; and an optical isolator configured to receive, for each of the plurality of erbium-doped fiber coils, the amplified optical signal and output the plurality of output optical signals, wherein the plurality of output optical ports are configured to receive one of the plurality of output optical signals.

The application discloses a kind of temperature modeling and compensation method of fiber-optic gyroscope based on double temperature sensor, including temperature data acquisition using temperature sensor fixed in the inside and outside of fiber coil base, calculate the time gradient and spatial gradient of fiber coil temperature, as the input information of fiber-optic gyroscope temperature model.Then, set acquisition parameters in high-low temperature box, record fiber-optic gyroscope output, temperature and temperature rate of change curve.According to data characteristics, segment data, and use each section of data to carry out multiple linear regression fitting, establish fiber-optic gyroscope temperature model.Then, calculate the gyroscope calibration factor at each temperature, and carry out polynomial fitting to reduce nonlinearity.Finally, pre-process the collected temperature data, substitute into temperature model to calculate real-time zero bias temperature compensation amount, complete online temperature compensation.Effectively improve the performance stability and measurement accuracy of fiber-optic gyroscope in different temperature environments.

The application belongs to the technical field of long-term drift suppression of fiber-optic gyroscope zero bias and scale factor, and particularly relates to a long-term drift suppression method for equivalent sensitive area of a fiber coil. A homogenization, de-homogenization analysis idea and a finite element analysis approach are adopted to establish, verify and calibrate thermodynamic parameters of each non-metallic material of the fiber coil. A mathematical model of long-time drift of circumferential strain, radial strain and three-dimensional stress of a micro-element section of the fiber coil with time, temperature and other environmental conditions is calculated to obtain long-time drift of effective refractive index of each micro-element section. Finally, average long-time drift and dispersion characteristics of the effective refractive index of the fast axis of the fiber coil are obtained, so that long-time drift characteristics of the scale factor of the fiber-optic gyroscope are analyzed. In turn, according to the model, thermodynamic parameters and geometric proportions of each non-metallic material of the fiber coil are optimized to finally realize long-term drift suppression of the equivalent sensitive area of the fiber coil.

The application provides a kind of optical fiber gyro transit time measurement method, generates square wave bias modulation signal and triangular wave modulation signal, superimposes and generates special modulation signal;Special modulation signal is applied to Y waveguide phase modulator by D / A converter and amplification circuit, and the phase modulation of two beams of light in optical path is carried out, and the phase-modulated light propagates in optical fiber ring for a week and then interferes in Y waveguide phase modulator;Interference light returns coupler and converts light intensity signal into analog voltage signal by detector;By the detector signal demodulation of the rising half cycle and the falling half cycle of triangular wave signal, the optical fiber ring transit time error Δt is obtained;Adjust the square wave bias modulation signal period, when the error is zero, half of the square wave bias modulation signal period is the optical fiber ring transit time.The application can realize high-precision detection of optical fiber ring transit time by adjusting FPGA software only, realizes on-line closed-loop control of gyro control period while not affecting the angular rate measurement function of optical fiber gyro.

The utility model discloses an optical cable distribution box for bearing multiple services, which comprises a box body and a box door, cable passing holes are distributed at the bottom end of the box body, and a special line service area and a common service area are divided in the box body; a fusion and distribution integrated tray is fixedly installed in the special line service area, a turnover structure which is arranged in a stacked mode is assembled on the fusion and distribution integrated tray in a rotating mode, and fiber coiling split rings are fixedly installed on the peripheral side of the fusion and distribution integrated tray and the turnover structure respectively. At least two groups of optical splitter slots are arranged in the common service area; fiber coiling devices are correspondingly arranged on the side part of the fusion and distribution integrated tray in the special line service area and on the side part of the optical splitter slot in the common service area respectively; different optical fiber service types can be integrated in one fiber distribution box, so that an operator can compete for customer resources and quickly open related services, the utilization rate of optical cable fiber core resources is improved, wiring in the box body is regular and orderly, later maintenance is facilitated, the working efficiency is greatly improved, and the operation and maintenance cost is reduced.

The invention discloses an optical fiber gyroscope which comprises a shell, an optical path module, a shielding ring assembly and an optical fiber machine waveguide assembly. The shell is provided with a mounting cavity, and the inner wall of the mounting cavity is coated with a shielding layer. The light path module is arranged in the mounting cavity; the shielding ring assembly is arranged in the mounting cavity around the optical path module and is provided with a magnetic shielding cavity, and the optical fiber is arranged in the magnetic shielding cavity; and the waveguide assembly is arranged in the mounting cavity and is connected with the outer side of the shielding ring assembly. The optical fiber coil is arranged in the magnetic shielding cavity, interference shielding can be achieved through the shielding ring assembly, the inner wall of the installation cavity is coated with the shielding layer, the shielding layer and the shielding ring assembly can act synergistically to jointly form a closed electromagnetic protection cavity, external interference shielding can be achieved, and the shielding effect can be achieved. Meanwhile, internal noise interference can be prevented from being reflected and coupled in the mounting cavity, so that the anti-interference capability of the fiber-optic gyroscope in a complex electromagnetic environment is effectively improved, and the application reliability of the fiber-optic gyroscope in the complex electromagnetic environment is improved.

The disclosure describes a vehicle propulsion system that uses antimatter stored in a chamber stabilized by magnetic and / or electrostatic fields. The antimatter chamber is positioned at a distance from the vehicle's center of gravity to create a matter-antimatter dipole that generates propulsion. The system includes a propulsion apparatus with a laser that produces photons and an optical device that spatially separates some of the photons into electrons and positrons using nonlinear optical effects. These particles are coupled into separate optical fiber coils that preserve photon coherence as they propagate. The coils are arranged to be spaced apart or partially overlapping so that the separated electrons and positrons form a matter-antimatter dipole, which produces a propulsion force that drives the vehicle.

The application relates to a fixing clamp and test equipment for a sea optical cable torsion and tension test, which comprises a fiber fusion box, a wedge-shaped clamping piece, a fiber coiling box and a fiber sliding ring; the fastening part of the wedge-shaped clamping piece is connected with the steel wire layer of the twisted end of the sea optical cable, and the wedge-shaped clamping piece is provided with a first fiber passing hole; the both ends of the fiber coiling box body are respectively provided with a first storage space and a second storage space; the fiber fusion groove of the fiber fusion box is arranged on the side of the fiber fusion box body far from the fiber coiling box, and the both ends of the fiber fusion box body are respectively provided with a first communication hole and a second communication hole; the optical fibers of the twisted end are sequentially arranged in the fiber fusion groove through the first fiber passing hole, the first storage space and the first communication hole; the jumper wires are sequentially arranged in the fiber fusion groove through the second storage space and the second communication hole; and M optical fibers and N jumper wires are fused one by one in the fiber fusion groove. The fiber coiling box and the fiber fusion box in the application effectively protect the optical fibers and can monitor the actual transmission rate change and strain change of each optical fiber.

The utility model discloses a general type optical cable junction box inner bag, its characterized in that: still include the multifunctional installation area of installing on the inner bag main part, install the combined type optical cable fixed area of the inner bag main part below, the multifunctional installation area include the insert piece type shunt ware installation frame or the excess fiber coiling device of installing on the crossbar, through the setting of multifunctional installation area, can choose the installation insert piece type shunt ware installation frame or the excess fiber coiling device flexibly, when installing insert piece type shunt ware installation frame, optical cable junction box is insert piece type optical cable junction box, when installing excess fiber coiling device, optical cable junction box is traditional type optical cable junction box or box type optical cable junction box, satisfy the optical fiber deployment demand under different scenes, increase the versatility of inner bag main part, same pair of inner bag main part, only need to change multifunctional installation area to can carry out different models, convenient for the reserve and management of spare parts.

The present application relates to the technical field of optical gyroscopes, and specifically relates to a resonant fiber-optic gyroscope driven by a low-power broadband light source and a working method thereof. The fiber-optic gyroscope comprises an ASE light source, a circulator, a Y waveguide, a fiber resonant cavity, a first coupler, a second coupler, a photoelectric detector, and a signal processing unit. The ASE light source is connected to the circulator, and the circulator is connected to the input port of the Y waveguide and the photoelectric detector. The first coupler and the second coupler each have four ports. The Y waveguide is connected to port 1 of the first coupler and port 1 of the second coupler. The fiber resonant cavity is composed of the first coupler, the second coupler, and a section of fiber coil. Port 2 of the first coupler and port 2 of the second coupler are through-arm ports, and port 2 of the first coupler and port 2 of the second coupler are connected by means of 90° polarization axis rotation fusion splicing polarization maintaining optical fiber. The present application can significantly improve the utilization rate of the light source, effectively improve the stability and sensitivity of the system, and has significant engineering application potential.

The utility model provides a sensing optical cable splicing protection box, which comprises a bottom box body, a fiber coiling protection box and a lead-in optical fiber extending out of the fiber coiling protection box are arranged in the bottom box body, the side wall of the bottom box body is provided with a bottom box hole for a sensing optical cable to penetrate, and the top of the bottom box body is open; the middle box body is a frame body of which the upper part and the lower part are opened, the side wall of the middle box body is provided with a middle box hole through which a sensing optical cable penetrates, and the middle box body is detachably arranged at the top of the bottom box body; and the cover body is detachably mounted at the top of the middle box body or the bottom box body. Through the combination of the cover body and the bottom box body or the middle box body, the splicing end of the sensing optical cable can be protected on the premise of not influencing concrete sub-bin construction, it is guaranteed that the first-buried sensing optical cable and the second-buried sensing optical cable can be effectively connected before subsequent construction bin pouring, the splicing quality and the survival rate of the optical cables are improved, and the construction period is shortened. And the overall continuity of the optical cable and the consistency of returned signals are ensured.

The application discloses a method for adaptively adjusting a gain fiber coiling diameter and a laser system, and relates to the field of fiber lasers. 01 and LP 11 bending loss curves in the gain fiber; and determining an optimal coiling diameter of the gain fiber according to the bending loss curves of the transmission modes LP 01 and LP 11 in accordance with a preset optimization principle. The optimal coiling diameter is used as a basis for adjusting the coiling diameter of the gain fiber. The application realizes adaptive feedback and automatic adjustment of the gain fiber coiling diameter according to the fiber temperature, so as to improve the TMI threshold.

The application discloses a kind of optical fiber current sensor harmonic superposition test system, method and measuring system, test system obtains superposed current light signal or single current light signal by optical fiber coil, and is sent to FOCT collector, FOCT collector outputs digital or analog signal, digital signal or analog signal is sent to error operation processing module after conversion channel conversion, the digital signal that current waveform exported by current signal source is sent to error operation processing module after conversion channel conversion after standard device, error operation processing module carries out synchronous error calculation according to the digital signal of first conversion channel transmission and the digital signal (or the digital signal that is output after second conversion channel) of FOCT collector, can display power frequency accuracy, direct current accuracy, harmonic accuracy, single component waveform, superposed current waveform, and is superior to the single harmonic accuracy and waveform that only display of existing harmonic measuring equipment.

The invention discloses a handheld electric fiber coiling device, and relates to the field of optical fiber coiling devices, the handheld electric fiber coiling device comprises a winding assembly, the winding assembly is used for automatically winding optical fibers and comprises a protective shell, a rotating shaft is rotatably arranged in the protective shell, one end of the rotating shaft is rotatably arranged in the protective shell, and the other end of the rotating shaft penetrates out of the protective shell; winding the optical fiber on a rotating shaft in the protective shell for winding protection; the protective shell is provided with a through hole for optical fibers to go in and out. A motor is arranged on the outer side of the protective shell, and the telescopic end of the motor extends into the protective shell, is connected with the rotating shaft and is used for driving the rotating shaft to rotate; a volute spring is arranged on the outer side of the protective shell, the inner side end of the volute spring is connected with the end, extending out of the protective shell, of the rotating shaft, the outer side end of the volute spring is connected with the protective shell, and the rotating shaft drives the volute spring to be wound when rotating. The device has the characteristics of easy optical fiber arrangement, easy outgoing and simple structure, can automatically recover on-site maintenance optical fibers, ensures that the optical fibers are effectively stored before and after being used, and greatly reduces the breakage rate of the optical fibers.

A fiber optic gyro device capable of improving the accuracy of the detection results of the fiber optic gyro device is provided. [Solution] This fiber optic gyro device includes a light source module 1, an optical fiber cable 2, an optical fiber coil 4 into which light passing through the optical fiber cable 2 in one direction is branched and enters from both one end and the other end, an optical phase modulator 3 that changes the phase of the light passing through the optical fiber coil 4 using a signal of a drive frequency DF and a feedback signal FS, a light source drive circuit 10 that drives the light source module 1, a power supply circuit 11 that has a switching circuit 111 that performs DC / DC conversion and supplies power to the light source drive circuit 10, a temperature sensor 13 that measures the temperature of the power supply circuit 11, and a control circuit 12 that controls the switching frequency SF of the switching circuit 111 based on the measurement result of the temperature sensor 13 so that the switching frequency SF is different from an integer multiple of the drive frequency DF.

The invention discloses a detachable testing device and method for an optical assembly of a fiber-optic gyroscope, and belongs to the technical field of fiber-optic gyroscope testing. The device comprises five independent detachable functional modules including a light source module, a detector module, an optical fiber ring module, a Y waveguide module and a coupler module, each module is provided with a module box and an openable module cover, corresponding optical components are integrated in the modules, and a fiber coiling guide groove is configured; the bottom of the module is magnetically attracted and fixed with a magnet on the tray through a plane screw, so that quick positioning and dismounting are realized; modules are welded through tail fibers to form a complete interference light path, and electrical interconnection is achieved through connectors. During testing, only the module to be tested needs to be placed in a testing environment, other modules are reserved outside, testing of a single module or any combination is supported, and optical fibers do not need to be welded again or non-testing parts do not need to be disassembled. The device is complete in structural design, convenient to operate and high in test efficiency, interference factors can be effectively eliminated, and objectivity and accuracy of test data are improved.

A fault detection device includes a body, a table suitable for laying, a roller located on the body, which applies pressure to the table, which rotates around itself and moves linearly on the table, and a motor located on the body for moving the roller. The body includes a dispenser disposed on the body, at least one fiber coiled on the dispenser, extending from the dispenser towards the roller and adhered and laid by pressure exerted by the roller on the table.

A phase modulation signal generating device for a fiber-optic gyroscope includes a sine wave generating part and a superimposing part. The sine wave generating part generates a fundamental sine wave of an odd-order frequency (v=(2n+1)Ve, where n=0, 1, 2, . . . ) of the eigenfrequency (Ve) of the fiber-optic coil and a higher-order sine wave of an odd-order harmonic frequency ((2m+1) v, where m=1, 2, 3, . . . ) of the odd-order frequency (v). The superimposing part superimposes the fundamental sine wave and higher-order sine wave generated by the sine wave generating part at a ratio using a modulation index optimized according to a noise target to be minimized and outputs the resultant signal as a phase modulation signal.

The present application relates to the technical field of papermaking, in particular to a kind of optical fiber coil fixed glue paper and its preparation method and application.The preparation raw material of the optical fiber coil fixed glue paper provided by the present application includes fiber and auxiliary agent;The fiber includes plant fiber 40-100%, natural cellulose fiber 0-40%, and chemical synthetic fiber 0-20% by mass percentage;The auxiliary agent includes wet strength agent and defoaming agent.The optical fiber coil fixed glue paper provided by the present application has low basis weight, has less influence on the thickness of optical fiber coil, has good glue absorption, has moderate strength, meets cutting requirements, is convenient to tear when winding coil, and because the fixed glue paper is relatively soft, can absorb part of the stress of solidified glue, has better temperature stability and anti-vibration performance, plays an important role in improving the overall precision and application level of optical fiber gyroscope.

Provided in the present disclosure is a smart home gateway, comprising: an outer housing, which comprises a first cover plate, a first connecting plate and a second cover plate, one side of the first cover plate being connected to a first connecting plate, one side of the second cover plate being connected to the first connecting plate, a gap being formed between the first cover plate and the second cover plate, and an opening being formed in a lateral side of the gap; and an inner housing, which is embedded in the gap and is covered by the first cover plate and the second cover plate, wherein the inner housing is detachably connected to the outer housing, and enters and exits the gap through the opening; and a fiber coiling mechanism is formed on one side of the inner housing, and is used for coiling of an optical fiber. The optical fiber is located inside the smart home gateway and disposed close to the center of gravity of the smart home gateway, such that after the optical fiber is coiled in the smart home gateway, the stability of the smart home gateway remains unchanged, and the smart home gateway can be disposed stably in a vertical or horizontal configuration. In addition, the inner housing is detachably connected to the outer housing, making it convenient for the optical fiber to be coiled around the fiber coiling mechanism.

An apparatus 100 for generating a propulsion force comprises: a laser arrangement 11; an optical device 120 comprising an optical region; and a coupling arrangement 140A comprising coils of optical fi