15 results about "Faraday effect" patented technology

The application provides a special mirror ring structure-based interferometric fiber-optic gyroscope, which comprises a light source, a polarizer, a coupler, two loopers, two Y waveguides, a signal generator, a 2-in-2-out mirror fiber ring, two photoelectric detectors and a signal joint demodulation module; wherein the two equal-length polarization maintaining optical fibers of the 2-in-2-out mirror fiber ring are both fused at the middle point with the fast axis at 90 degrees, and when each polarization maintaining optical fiber is fused with the Y waveguide tail fiber, one end is fused with the fast axis at 0 degrees and the other end is fused with the fast axis at 90 degrees. In the fiber-optic gyroscope, the light is no longer sent into two polarization channels of the same fiber ring through a polarization beam splitter and combiner, but is fused with two spatial mirror fiber rings at 0 degrees and 90 degrees through two Y waveguides, so that the radial magnetic field phase error caused by the Faraday effect is suppressed, and the temperature phase error caused by the Shupe effect can be compensated by joint demodulation of the electric signals of the two photoelectric detectors.

The invention discloses an electromagnetic valve performance testing device, which belongs to the technical field of electromagnetic valve testing and comprises a base and a pilot coil, a main frame is arranged on the surface of the base, a conveying belt is arranged in the main frame, a guide wheel is arranged at one end in the conveying belt, and a driving wheel is arranged in the other end of the conveying belt. An electrical performance test assembly and a magnetic performance test assembly are oppositely arranged on the outer side wall of one end, close to the guide wheel, of the main frame, and a photoelectric switch fixed by a support is arranged above the main frame. The magnetic performance testing assembly is arranged, a magnetic field is directly measured through the Faraday effect, interference of a traditional contact type probe is fundamentally eradicated, synchronization of testing and control is achieved through cooperative use of the polarization splitting prism and the photoelectric switch, scanning motion can be converted into heat dissipation power through the heat dissipation air inlet channel, and the heat dissipation effect is improved. The stability of long-time work is guaranteed in a zero power consumption mode, and the energy consumption and maintenance requirements are remarkably reduced while the data accuracy and reliability are improved.

The utility model discloses a light path test device for three-dimensional measurement of a weak magnetic field, which relates to the technical field of weak magnetic field measurement and comprises a working circular truncated cone, a first support and a second support are fixed on the working circular truncated cone, and the end of the first support far away from the working circular truncated cone is rotatably connected with a placing plate. The end, away from the working circular truncated cone, of the second support is rotationally connected with an angle adjusting plate, a magnetic field measuring box is fixed to the angle adjusting plate, an Arduino development board is fixed into the magnetic field measuring box, a polarizer and an analyzer are arranged on the two sides of the Arduino development board respectively, and a photodiode electrically connected with the Arduino development board is arranged on the Arduino development board. An aluminized reflecting mirror which rotates in the magnetic field measuring box is arranged on the outer side of the polarizer or the polarization analyzer, and a Helmholtz coil is further arranged between the first support and the second support; the equipment can more accurately measure the magnetic field intensity in the magneto-optic glass, and avoids the limitation that the Faraday effect can only enable a light beam in the same direction as the magnetic field to deflect.

This invention relates to a polarization-tunable ultrashort, ultra-intense mid-infrared pulse system, comprising: a laser source for generating an incident laser beam, wherein the incident laser beam is a linearly polarized laser; a plasma unit for providing a plasma environment for the transmission of the incident laser; and a magnetic field generating unit for providing a unidirectional magnetizing magnetic field to the plasma environment. The polarization direction of the incident laser is set at an angle to the magnetization direction of the magnetic field. The incident laser, based on the unidirectionally magnetized plasma environment, generates a circularly polarized mid-infrared pulse using relativistic magnetic birefringence or the Faraday effect. This scheme generates polarization-tunable, relativistically intense, short-period, long-wavelength mid-infrared pulses through the interaction of linearly polarized laser and unidirectionally magnetized plasma. It maintains high pulse quality while achieving precise control of the mid-infrared pulse polarization state.

An isolator based on a waveguide-based artificial dielectric medium is scalable to a range of desired terahertz frequencies, has non-reciprocal transmission and provides low insertion loss and high isolation at various tunable terahertz frequencies, far exceeding the performance of other terahertz isolators, and rivaling that of commercial optical isolators based on the Faraday effect. Because terahertz artificial dielectrics are low loss, inexpensive, and easy to fabricate, this approach offers a promising new route for polarization control of free-space terahertz beams in various instrumentation applications. Artificial dielectrics are man-made media that mimic properties of naturally occurring dielectric media, or even manifest properties that cannot generally occur in nature. A simple and effective strategy implements a polarizing-beam-splitter and a quarter wave plate to form a highly effective isolator. Performance of the device is believed to exceed that of any other experimentally demonstrated method for isolation of back-reflections for terahertz beams.

A magneto-optical sensor can be used to measure electrical current with a very narrow pulse width as sensed by the magnetic field in the transmission line region of a pulsed power accelerator. Pulsed power accelerator experimental results agreed remarkably well with the Faraday effect theory, device physical model, and reference electrical current shunt data.

The invention discloses a miniaturized kilowatt-level optical isolator based on an innovative magnetic circuit, and relates to the field of passive optical devices. The isolator comprises a first collimator, a second collimator, a first polarizing beam splitter, a second polarizing beam splitter, a third polarizing beam splitter, a fourth polarizing beam splitter, a first optical rotation assembly, a second optical rotation assembly, a first light absorption device, a second light absorption device and a shell. Aiming at a thermally induced birefringence compensation scheme adopting double magneto-optical crystals and a quartz optical rotation sheet, the core of the invention lies in innovation of a permanent magnet structure in an optical rotation assembly: two discrete magnetic field peak regions are constructed on an optical axis by adopting a multi-ring nesting and specific magnetizing design. On the basis, a magnetic field strategy distributed according to needs is provided, the two magneto-optical crystals are arranged at the peak value of the magnetic field to enhance the Faraday effect, and meanwhile the quartz optical rotation piece is made to avoid the middle area. The design is different from a traditional uniform field scheme, and by means of accurate distribution of magnetic energy, device miniaturization and magnetic energy efficiency improvement are achieved while high isolation and kilowatt-level power bearing are guaranteed.

The invention discloses a high-precision double-ring interference type fiber-optic gyroscope with a magnetic field error suppression function. The device comprises a light source, a polarizer, a polarization-maintaining coupler, two multifunctional integrated Y waveguides, four polarization beam splitters / combiners, two polarization-maintaining circulators, two photoelectric detectors and a polarization-maintaining optical fiber ring. Light transmitted by a light source is divided into two beams through a polarization-maintaining coupler, and the two beams respectively enter two branch light paths with symmetrical structures; in the first branch light path, a first light beam enters a first port of a first polarization beam splitter / combiner and a second port of a second polarization beam splitter / combiner through a first circulator and a first multifunctional integrated Y waveguide respectively and is transmitted clockwise and anticlockwise respectively. In the double-optical-path fiber-optic gyroscope, light is respectively propagated once in a light path on a fast axis and a slow axis, errors introduced under a radial magnetic field are equal in size and opposite in direction, and output phase drift caused by the Faraday effect can be completely offset theoretically, which is of great significance in enhancing the environmental adaptability of the fiber-optic gyroscope under the radial magnetic field.

The application provides a resonant optical fiber current sensing system and a working method, comprising: a signal generation and detection system, an optical fiber resonant cavity sensing unit, a wave plate unit and an optical modulator unit; the signal generation and detection system is connected with the optical fiber resonant cavity sensing unit, and the optical modulator unit and the wave plate unit are arranged between the signal generation and detection system and the optical fiber resonant cavity sensing unit. The application adopts the optical fiber resonant cavity as a sensitive unit to detect the resonant frequency difference of light caused by the Faraday effect, and compared with the scheme of detecting the phase difference caused by the Faraday effect in the traditional scheme, the sensitivity is higher, and the environmental interference resistance is stronger.

The invention discloses an optical fiber gyroscope circuit board crosstalk detection device and method based on current driving, and belongs to the technical field of optical fiber gyroscopes. The device comprises a light source driving board, a broadband light source, a coupler, a Y waveguide, a 1 / 4 wave plate, an optical fiber ring, a detector, a winding coil and an equivalent rotating speed driving module. The equivalent rotating speed driving module applies changing current to the coil wound on the optical fiber ring, and a changing phase difference is generated in the optical fiber ring by utilizing a Faraday effect, so that a Sagnac phase difference caused by rotation of the equivalent rotary table is realized, and quantitative detection of crosstalk of the detected circuit board is realized. The circuit board level crosstalk test can be independently completed under the condition that a rotary table is not used, electromagnetic interference and environmental disturbance introduced by the rotary table are avoided, the magnitude and period of the excitation current are controllable, rotation speed input of different precisions can be simulated, and the circuit board level crosstalk test device has the advantages of being low in cost, convenient to operate and accurate in measurement.

According to the multidirectional all-fiber vector magnetic field sensor, an original light beam emitted by a light source is divided into N independent light beams with the same intensity through a first coupler, and each independent light beam enters a corresponding light path channel. And the N independent light path channels respectively process the independent light beams. In an optical path channel, a weak Faraday rotation signal is converted into a phase signal for detection by adopting a phase modulation technology. Magnetic field measurement is realized by adopting orthogonal arrangement of magneto-optical crystals, a magnetic field value is directly measured based on a Faraday effect, the problems of errors and drifting caused by air-core coil integration are fundamentally avoided, and magnetic field components in two or three orthogonal directions in a space can be decoupled and measured at the same time through independent and orthogonal magneto-optical crystal design; and real vector measurement is realized. The sensor provided by the invention completely adopts an optical fiber optical path, is good in electrical insulating property and resistant to electromagnetic interference, and the probe of the whole sensor is compact and small in structure and high in spatial resolution.

The invention discloses a weak magnetic field three-dimensional measurement big data analysis system based on a Faraday effect. The system comprises a magnetic field excitation module, a polarization modulation module, an optical signal acquisition module, a data processing module, a network training module and a result output module. The magnetic field excitation module outputs an excitation magnetic field and transmits parameters; the polarization modulation module modulates laser and magnetic field effects; the optical signal acquisition module captures and processes optical signals; the data processing module combines a physical model and a resolving algorithm to obtain original data; the network training module constructs generative adversarial network optimization data; and the result output module outputs three-dimensional magnetic field distribution data. The system improves the measurement accuracy, the data processing efficiency and the adaptive capacity through multi-module cooperation in combination with an algorithm and a model, effectively overcomes the problems of poor interference resistance, low efficiency and the like, and is suitable for a weak magnetic field three-dimensional measurement scene.

The utility model discloses a Faraday effect tester with a gauss meter, which comprises a gauss meter box body and an electric box, the gauss meter box body is provided with a support corner, the support corner is provided with a monochromator, the monochromator is provided with an exit slit and an entrance slit, the entrance slit is provided with an entrance slit hand wheel, and the entrance slit hand wheel is provided with an entrance slit. The entrance slit is provided with a first connecting cylinder, and the first connecting cylinder is connected with a light source. The utility model relates to the technical field of farther effect testers of gauss meters. The calibration of the electromagnetic induction intensity of the electromagnet magnetic field is facilitated, students can learn the calibration method of the electromagnetic induction intensity of the electromagnet, the accuracy of experimental data is ensured, and different samples can be installed on the sample support for measurement.

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.

The invention discloses a passive ultra-large dynamic range optical fiber current sensor comprising a pulse light source used for emitting light pulses; the optical polarizer is used for converting the optical pulse into linearly polarized light; the main coupler is used for dividing the linearly polarized light into a clockwise light path and an anticlockwise light path; the sensing optical fiber ring surrounds a current conductor to be measured and is used for sensing the Faraday effect generated by the current; the light path differentiation module is arranged in the anticlockwise light path and is used for splitting the anticlockwise light into at least two sub-pulses which are separated in time and have different phase offsets; sine and cosine response signals of Faraday phase shift are obtained at the same time through an optical path differentiation module and a signal processing algorithm, and switching and splicing are carried out between linear working areas of the sine and cosine response signals, so that a plurality of piecewise linear responses are seamlessly connected into continuous and ultra-large-range linear output; the problem of phase ambiguity caused by response function periodicity of a traditional open-loop optical fiber current sensor is solved.