214 results about "Magneto optical" patented technology

The invention discloses an OEO amplifier with a high-speed hard switching function and an optical transmission system, and relates to the technical field of optical amplifiers, the OEO amplifier comprises three magneto-optical switches, an optical splitter group, a photoelectric detector group, a real-time comparison circuit, a logic gate control circuit and a driving circuit; the photoelectric detector group collects optical signal power to generate an electric signal; the real-time comparison circuit performs voltage threshold judgment on the electric signal; the logic gate control circuit is connected with the output end of the real-time comparison circuit so as to synchronously control the switching states of the three magneto-optical switches according to a voltage threshold judgment result; the driving circuit is used for driving the magneto-optical switch to synchronously execute a switching action; when the OEO amplifier detects that optical signals in any direction are interrupted, all the magneto-optical switches finish synchronous switching within 100 microseconds, and the end-to-end optical signal switching time difference is smaller than 2 picoseconds. The method is suitable for a single-fiber bidirectional optical communication environment requiring high frequency, high precision and high stability.

The invention discloses a visual tactile sensor based on a magnetic imaging principle. The visual tactile sensor comprises a shell, an image acquisition module, a magnetic pole display film, an elastic body and a magnetic film, the magnetic pole display film, the elastic body and the magnetic thin film are arranged in the shell from top to bottom, and the image acquisition module is located above the magnetic pole display film and used for acquiring an image of the magnetic pole display film; when the sensor is used for pressure sensing, the position with the maximum gray level variation of the magnetic pole display film image is the pressure acting position, and the pressure is equal to the result that the gray level variation of the magnetic pole display film image is divided by the magneto-optical conversion coefficient of the magnetic pole display film and the product thereof. The magnetic induction intensity in the center range of the surface of the magnetic film, the initial distance between the magnetic film and the magnetic pole display film and the equivalent elastic coefficient of the magnetic film and the elastic body are related. The sensor converts a mechanical signal into a magnetic field signal and then converts the magnetic field signal into an optical image, high-sensitivity sensing of tiny pressure is achieved, and meanwhile the sensor has the higher signal-to-noise ratio, stability and anti-interference capacity.

The present application relates to a kind of methods and applications of growing bismuth-doped rare-earth iron garnet BRIG crystal by guided mode pulling-top seed crystal method.For solving the problems of large internal stress, many defects, difficult to prepare thick film of single crystal in the current liquid phase epitaxy method of growing BRIG crystal;And the problems of long growth cycle, difficult to obtain seed crystal in top seed crystal method, the present application combines the fast growth of guided mode pulling crystal and the high-quality single crystal growth of top seed crystal method, and invents guided mode pulling-top seed crystal method to realize the fast growth of high-quality BRIG single crystal.First, the large-size doped rare-earth iron garnet crystal with high lattice matching and similar composition is quickly grown by guided mode pulling method, which is cut into centimeter-level seed crystal, and high-quality BRIG bulk single crystal is quickly grown by TSSG method.The crystal grown by this method has the advantages of small internal stress, less cracking, good uniformity, fast crystal growth, etc., and has obvious advantages in high-performance magneto-optical isolator.

The invention discloses an ultrafast terahertz response magnetic field measurement method and system based on a linear magneto-optical conversion material, and the method comprises the steps: preparing a linear magneto-optical conversion heterojunction film which comprises at least one signal generation layer with a linear magneto-optical conversion characteristic and at least one signal emission layer with a strong spin-orbit coupling effect; placing the heterojunction thin film at the position of a magnetic field to be measured, and irradiating the heterojunction thin film by using femtosecond laser pumping pulse so as to enable the heterojunction thin film to radiate a terahertz signal; through the terahertz vector detection and rotation detection system, the positive and negative and the magnitude of terahertz signals radiated by the heterojunction film in three groups of orthogonal directions are detected, and the magnetic field direction and the magnitude of the magnetic field position to be detected are calculated based on the three groups of terahertz signals. The sensor has the advantages of being high in sensitivity, high in response speed, non-contact and the like, can achieve rapid detection of various vector magnetic fields such as stable, periodic modulation and sub-picosecond transient pulse, and has hundred-nanometer-scale spatial resolution capacity.

A diamond magneto-optical sensor includes: a diamond that includes a color center with an electronic spin and is irradiated with excitation light, and an irradiation unit that irradiates the diamond with the excitation light of the color center and electromagnetic waves for magnetic resonance, wherein the irradiation unit receives modulated light having been subjected to amplitude modulation, and a modulation frequency of the modulated light is included in a microwave frequency band.

The invention provides a preparation method and device of Bi2O3-B2O3 inverse magnetic rotation glass, and the preparation method comprises the following steps: (1) placing a glass raw material in a closed heating furnace, introducing ultra-dry oxygen, and simultaneously exhausting outwards to enable the pressure in the furnace body to be P1 which is more than or equal to 1kPa and less than or equal to 5kPa; (2) heating to melt the glass raw material in the furnace body into molten glass, raising the temperature to a clarification temperature, introducing the mixed gas into the molten glass by a bubbling method, simultaneously homogenizing and stirring, and stopping introducing the mixed gas and starting defoaming and stirring when the homogenizing and stirring time reaches t1; wherein the mixed gas comprises ultra-dry oxygen and boron trichloride, the volume ratio of the ultra-dry oxygen to the boron trichloride is k, and k is (1-5): 1; (3) cooling, forming, annealing and pouring; in the step (2) and the step (3), the pressure in the furnace body is kept P1. The Bi2O3-B2O3 diamagnetic optical rotation glass prepared by the method disclosed by the invention is stable in magneto-optical performance and low in hydroxyl absorption coefficient in a middle-infrared band.

The invention discloses a detection auxiliary device of a magneto-optical isolator, and belongs to the technical field of detection auxiliary devices. The device comprises a detection table; the base is fixedly connected to the bottom of the detection table; the auxiliary transmission structure is mounted at the top of the outer surface of the detection table; the adjustable limiting structure is mounted on one side of the auxiliary transmission structure; and the light guide shielding structure is mounted on one side of the detection table. According to the device, under the action of the auxiliary transmission structure, the position of the adjustable limiting structure can be changed, then auxiliary limiting can be carried out on the magneto-optical isolator under the action of the adjustable limiting structure, due to the three clamping grooves in different shapes, the adjustable limiting structure can clamp the magneto-optical isolators in different shapes, and therefore the clamping effect of the magneto-optical isolators is improved. Due to the fact that the three clamping grooves and related structures are arranged in a circumferential mode, the clamping groove actually playing a clamping role is located under the clamping groove, the other two clamping grooves are located above the clamping groove, and the three clamping grooves and the related structures cannot affect each other.

A system and method for determining and modifying the electromagnetic activity of a patient's heart includes a sensor array, a controller, software, and a stimulator array. The sensor array includes one or more sensors, such as an ECG electrode, that detect the electromagnetic activity of a patient's heart. The sensor array is in data communication with the controller. The controller runs software that outputs in human-format sensor data provided by the sensor array. The software receives data from the controller, analyzes the data, presents the data to the user, and sends the data to the stimulator array via a data communication link. The stimulator array includes one or more electromagnets and at least one or more light-emitting diodes. The stimulator array emits an electromagnetic (and / or light) field to modify the electromagnetic activity of a patient's heart based on the data it receives from the controller. The system can be portable.

The application discloses an optical neural network nonlinear activation system, method and device, relates to the technical field of optical neural networks, and because a magneto-optical material is integrated in a phase adjustment waveguide arm of a nonlinear activation unit, a controller can control the magneto-optical material of the phase adjustment waveguide arm to generate a magneto-optical effect according to a current activation function type and weights of the optical neural network, so as to perform phase adjustment on an optical signal transmitted through the phase adjustment waveguide arm, and make the nonlinear activation unit adapt to the current activation function type and the weights, perform corresponding nonlinear calculation on a target input signal, and realize dynamic switching of multiple nonlinear activation functions, thereby improving the flexibility of the optical neural network.

The invention belongs to the technical field of quantum optics, and discloses a double-pointer weak measurement-based complex magneto-optical Kerr angle measurement method, which comprises the following steps of: placing a sample to be measured between a weak coupling unit and a system front selection state unit or between the weak coupling unit and a system rear selection state unit, and reflecting an incident light beam from the surface of the sample; the system front selection state unit is adjusted, so that the light intensity signal acquired by the light signal acquisition unit is minimum; adjusting the pre-system selection state unit to enable the polarization state of the outgoing beam to be horizontal or vertical polarization, and adjusting the post-system selection state unit to enable the polarization state of the outgoing beam to be vertical or horizontal polarization; the external magnetic field intensity is adjusted, and meanwhile, the light spot mass center offset and the light intensity are received through the light information acquisition unit; and calculating a magneto-optical Kerr rotation angle and an ellipsometry rate. The method can be used for synchronously measuring the magneto-optical Kerr angle and the ellipsometry in one instrument state, and has extremely high sensitivity.

This invention belongs to the field of electromagnetic field measurement technology for transformers, and proposes a multi-parameter measurement system and calibration device for the electromagnetic field of converter transformers. In the measurement system, a laser is connected to one end of an electro-optic sensing probe, and the other end of the probe is connected to the electromagnetic field measurement host. The laser is also connected to one end of a magneto-optic sensing probe, which in turn is connected to the host. Both probes are bonded to designated points inside the converter transformer's oil tank. The calibration device, used for numerical calibration of the electro-optic and magneto-optic sensing probes, includes an electric field testing platform and a magnetic field testing platform. This invention enables real-time online non-contact electromagnetic field measurement inside converter transformers, which require high insulation, have a compact space, and a sealed structure. It features high sensitivity and a wide measurement range, meeting the measurement needs of complex electric fields in converter transformer equipment under actual operating conditions.

The invention relates to the technical field of optics, and discloses a displacement adjusting method of a magneto-optical crystal, so as to meet the requirement that a user can conveniently, reliably, flexibly and manually switch among multiple wavelengths or multiple optical rotation angles. The method comprises the following steps: determining the magnetic flux density distribution of the magneto-optical crystal along the optical axis displacement in a target equipment magnetic cylinder to which the magneto-optical crystal belongs; determining the transmission relation of the adjusting ring of the target equipment in the process of circumferentially rotating around the optical axis to drive the magneto-optical crystal to move along the optical axis; calculating Vierdean constants respectively corresponding to the series of target wavelengths at the expected working temperature of the target equipment; according to the magnetic flux density distribution, the Viert constant and the length of the magneto-optical crystal, a series of positions where the magneto-optical crystal generates the same target optical rotation angle for polarized beams corresponding to different target wavelengths in the displacement process of the target magnetic cylinder are calibrated; and in the assembling process, the reference position is determined firstly, and then the corresponding scribed line on the adjusting ring is aligned with the reference line on the shell.

The application discloses a multi-directional excitation magneto-optical image registration method under hybrid driving, and the method comprises the following steps: collecting the defect magnetic field distribution information of the surface of a ferromagnetic material under multi-directional excitation through a magneto-optical imaging device to obtain a reference image and a floating image; extracting the defect contour of the two images according to a gradient operator; performing spatial transformation on the defect contour of the floating image, and then performing or operation and morphological closing operation on the defect contour of the floating image and the defect contour of the reference image to obtain a defect contour map with closed shape; obtaining the magnetic leakage field distribution map of the defect contour map through defect magnetic leakage field model forward modeling; calculating the similarity measure of the reference image and the magnetic leakage field distribution map generated by the model; and finally continuously updating the spatial transformation parameters through an optimization search algorithm, and the registration is successful when the similarity measure reaches the maximum.

The invention provides a non-reciprocal terahertz device. The non-reciprocal terahertz device comprises a first waveguide; the second waveguide is suitable for outputting the terahertz wave from the first waveguide; the at least three third waveguides are used for coupling the terahertz waves from the first waveguides to the second waveguides; the composite structure is positioned in each third waveguide and comprises a substrate; the first grating is suitable for converting the terahertz wave from the first waveguide from a linear polarization state to a circular polarization state rotating along a first direction; the magneto-optical material layer allows the circular polarization state terahertz waves rotating in the first direction to pass through under the action of an external magnetic field and blocks the circular polarization state terahertz waves rotating in the second direction to pass through; and the second grating is suitable for converting the terahertz wave passing through the magneto-optical material layer from a circular polarization state rotating along the first direction to a linear polarization state, transmitting the terahertz wave in the linear polarization state to the second waveguide, and converting the reflected terahertz wave from the linear polarization state to a circular polarization state rotating along the second direction.

The utility model relates to a magneto-optical isolator and laser equipment. The magneto-optical isolator comprises a polarization light splitting element which can penetrate through first polarization light and block second polarization light, and the polarization light splitting element is provided with a first area and a second area; the optical rotation device is opposite to the first area; the magnetic optical rotation element is arranged on one side, opposite to the polarization light splitting element, of the optical rotation device and is provided with a third area and a fourth area; the conduction assembly enables light rays entering the magnetic rotation element from one of the third area and the fourth area to go back and forth in the magnetic rotation element and then to be emitted out from the other one of the third area and the fourth area; light emitted from the first area is converted into one of first polarization state light and second polarization state light after passing through the optical rotation device and the magnetic optical rotation element, and light emitted from the second area is converted into the other one of the first polarization state light and the second polarization state light after passing through the magnetic optical rotation element and the optical rotation device. According to the magneto-optical isolator, the miniaturization design can be realized.

The invention discloses a magneto-optical effect-based dynamic zooming method and an optical system, and the method comprises the steps: arranging at least one magneto-optical crystal between a pre-amplifier and a main amplifier, so as to achieve the dynamic zooming through the magneto-optical effect; wherein the magneto-optical crystal is obtained by combining anisotropic materials with matched refractive indexes, and the anisotropic materials are processed into complementary parabola shapes. According to the invention, the magneto-optic effect is utilized to realize dynamic zooming, and the mode of complementary combination of the crystals with matched refractive indexes is utilized to solve the problem that the additional wavefront shape does not conform to the demand. Compared with an electro-optical effect scheme, an applied magnetic field is a uniform magnetic field along a transmission direction, so that a depolarization problem caused by a transverse component is avoided; compared with the scheme of aperture division, grating division and the like, the dynamic zooming can be realized on the premise of not influencing the output capability of the laser.

The application discloses a kind of semiconductor laser system and return light protection method.It includes laser, transmission fiber, processing head and drive control system, drive control system includes drive module and control module.Laser chip emits laser, and after shaping mirror group is shaped, it is coupled into transmission fiber, and from transmission fiber to processing head;Drive module provides operating current to laser chip;Control module monitors the operating voltage of laser chip in real time, when the operating voltage monitored exceeds preset safety threshold, sends off signal to drive module;Drive module receives off signal and cuts off the drive current output to laser chip.The application does not need additional optical detector and expensive magneto-optical isolator, directly monitors laser chip voltage parameter, only realizes return light protection by circuit module, simple structure, easy to integrate, low in cost, response is fast, can identify return light in time and execute protection, avoid laser chip to suffer persistent damage.

The invention relates to the technical field of interventional medical treatment, and discloses a magneto-optical positioning assisted catheter wall contact risk monitoring system and method.The method comprises the steps that initial three-dimensional position data and actual magnetic field signals of a catheter are collected, and the initial three-dimensional position data are calibrated based on the actual magnetic field signals and a preset magnetic field reference signal range; a contact force signal of the wall surface of the catheter and the vascular tissue and temperature data in the catheter are collected, and the contact force signal is corrected based on the temperature data and a preset reference temperature interval; acquiring wall surface image data of the front end and the lateral direction of the catheter, extracting image features, and establishing a spatial geometrical relationship between the wall surface of the catheter and vascular tissue; according to the final three-dimensional position data of the catheter and the mapping result of the spatial geometrical relationship, judging the contact risk level of the wall surface of the catheter and the vascular tissue; and outputting warning information and sending a motion compensation control instruction based on the risk level. According to the invention, real-time monitoring and accurate intervention of the contact risk of the wall surface of the catheter can be realized.

The application discloses a kind of spin latches based on ultrafast magneto-optical dynamics, construction method and system, belong to spin dynamics technical field, the basic function of RS latch is realized by the angle of Co4&gamma-Graphyne system spin state control, successfully designed with RS latch as the foundation spin latch latch, the logic unit consumed is less, compared with the traditional latch, avoid the influence of glitch, and the entire completion time reaches ultra-high speed sub-picosecond, guarantee degree is more than 95%.This provides a train of thought for the design and application of new generation spin latch.

The present application relates to a kind of stress line birefringence compensation method of optical current sensor, the optical current sensor includes laser source, polarizer, magneto-optical film, nanometer ring-shaped radial polarization grating, image beam and CMOS area array camera sequentially arranged in same optical path, the method includes the following steps: utilize laser source to emit light signal, under the action of current to be measured, the output signal of optical current sensor is superposed with Faraday magnetic rotatory angle θ And stress line birefringence δ, form synchronous rotating annular light spot;Determine the zero-crossing moment of the measured alternating current, the rotation angle of corresponding annular light spot is stress line birefringence δ at zero-crossing moment by CMOS area array camera and record;Based on the stress line birefringence δ of record, utilize model-free adaptive iterative learning method to predict the stress line birefringence δ of future time, and according to the prediction result, the output signal of optical current sensor is compensated.

The application relates to a magneto-optical Kerr measurement device and a method for acquiring a magnetic domain wall image. The magneto-optical Kerr measurement device comprises a magneto-optical Kerr microscope, wherein the magneto-optical Kerr microscope comprises an ocular lens and a CMOS camera; and an event camera, wherein the event camera comprises an underlying chip, the event camera is arranged on the ocular lens of the magneto-optical Kerr microscope, and the event camera is in a confocal plane with the CMOS camera. The method is to acquire a magnetic domain wall image by using the event camera in the magneto-optical Kerr measurement device. The application can improve the rapid detection of the magnetic material, has high resolution, is simple to operate, and has important significance for the research and development of the magnetic material.

The invention belongs to the technical field of integrated optics, and relates to a silicon-based integrated magneto-optical waveguide preparation method, a silicon-based integrated magneto-optical waveguide and an isolator. The method comprises the following steps: providing a substrate layer; forming a magneto-optical film layer on the surface of the substrate layer; forming a waveguide core layer on the surface of one side, far away from the substrate layer, of the magneto-optical film layer by utilizing a photoetching process; wherein the material of the waveguide core layer is a polymer, and the refractive index of the material of the waveguide core layer is smaller than that of the material of the magneto-optical wave film layer; and the waveguide core layer is used for generating a continuous domain bound state mechanism to enable the TM light mode and the TE light mode of the coupled input light to destructively interfere between different coupling channels, so that the energy of the coupled input light is bound in the waveguide core layer in the TM light mode, and low-loss transmission of the coupled input light is realized. According to the scheme, the magneto-optical wave film layer does not need to be etched, the waveguide structure can be prepared only through a single-step photoetching process, the waveguide core layer capable of generating a continuous domain bound state mechanism is obtained, and therefore ultra-low loss transmission is achieved.

The invention provides a four-port circulator based on dissipation and phase regulation, the circulator is provided with four optical cavities and at least one optical signal input device, and the four optical cavities are respectively named as a first port, a second port, a third port and a fourth port; according to the main body part of the circulator, four fixed high-reflection single-face fixed mirrors serve as fixed boundaries of an optical cavity, and four high-reflection single-face spring mirrors with nanometer springs on the backs serve as the other movable boundaries of the optical cavity. And a cavity area between the high-reflection single-sided fixed mirror and the high-reflection single-sided spring mirror is an optical cavity. According to the circulator, port dissipation is innovatively introduced to break reciprocity, the technical problem that miniaturization integration of a traditional circulator is limited due to the fact that the traditional circulator must depend on magneto-optical materials and an external magnetic field is solved, manufacturing cost is reduced, and important technical support is provided for on-chip integrated optical signal processing networks and calculation.

The application discloses a kind of measurement system and method based on magneto-optical Kerr effect, belong to magnetic material measurement and imaging technical field, including three-dimensional displacement platform, optical path unit, electromagnetic unit and software control unit, three-dimensional displacement platform is in the magnetic field provided by electromagnetic unit;Optical path unit includes frame body and the laser generating device, focusing control device, differential signal measuring device and imaging device arranged in frame body interior;Linearly polarized light provided by laser generating device is focused to the sample surface fixed on three-dimensional displacement platform by focusing control device, sample surface reflects and returns focusing control device by reflected light, beam splitting obtains first reflected light and second reflected light, and the focusing control device can move up and down;Differential signal measuring device receives second reflected light to obtain electric signal, and transmit to software control unit;Imaging device receives first reflected light to realize the imaging of sample;Software control unit draws hysteresis loop according to the magnetic field intensity of the magnetic field and electric signal.

This invention relates to the field of track inspection technology, and in particular to a method and system for detecting track defects based on magneto-optical sensing. The method includes: emitting high-brightness linearly polarized light onto the train track under high-speed train operation conditions; the linearly polarized light undergoing polarization angle rotation due to the interaction between the magneto-optical sensing medium and the local magnetic field of the abnormal track section, wherein the magneto-optical sensing medium and the abnormal track section are non-contactly coupled; acquiring polarization rotation information and converting it into an observable light intensity change signal; collecting the light intensity change signal and forming a magneto-optical image; performing polarization analysis and magneto-optical anomaly reconstruction on the magneto-optical image to convert it into a magneto-optical anomaly field with spatial distribution characteristics; and determining the defects in the abnormal track section based on the magneto-optical anomaly field. This invention transforms the invisible magnetic domain anomalies induced by internal stress in the track steel into a visible magneto-optical anomaly field through magneto-optical sensing, achieving non-contact detection of surface and subsurface cracks.

This invention discloses a method for enhancing the uranium separation efficiency of commercial iron powder using an external field, comprising: adding commercial iron powder to a reactor containing fluorine- and uranium-containing wastewater; applying an external weak magnetic field or magneto-optical coupling; and performing uranium separation treatment on the fluorine- and uranium-containing wastewater under continuous stirring. This invention magnetizes the commercial iron powder by introducing a weak magnetic field, thereby attracting Fe... 2+ Migration disrupts the passivation layer on the surface of iron powder, promoting the reaction of U(VI) with Fe. 0 The redox reaction simultaneously strengthens the affinity between the magnetized iron powder particles and the paramagnetic O2 molecules, leading to the formation of γ-FeOOH nanosheets with a high specific surface area on the iron powder surface. The γ-FeOOH surface is rich in oxygen-containing functional groups, which achieve U(VI) separation through the bonding of -OH groups with U(VI). This invention, based on a weak magnetic field, further improves the separation efficiency of commercial iron powder for U(VI) in fluoride- and uranium-containing wastewater by coupling with an optical field.

The invention relates to a magnetic sensor (1) having a microwave source (6) and a sensor plate (2), the sensor plate (2) having a sensor crystal (5) with at least one magneto-optical defect, an excitation light source (3), a detector (7) and at least two permanent magnets (8). The sensor crystal (5) is arranged in such a way that the microwave radiation generated by the microwave source (6) can be absorbed by the at least one magneto-optical defect of the sensor crystal (5). The excitation light source (3) is arranged to emit an excitation light beam (4) and is configured and arranged in such a way that the excitation light beam (4) emitted by the excitation light source (3) can induce emission of fluorescent radiation in the at least one magneto-optical defect of the sensor crystal (5). The detector (7) is designed and arranged in such a way that it detects the emitted fluorescent radiation. The at least two permanent magnets (8) are arranged and arranged in such a way that they generate a uniform, static magnetic field in the sensor crystal (5).

A magneto-optical sensor monitors a semiconductor element in a semiconductor module. The magneto-optical sensor is arranged in a region of the semiconductor element or of at least one of the feed lines of the semiconductor module that make contact with the semiconductor element. A polarized light signal is reflected from the magneto-optical sensor or transmitted through the magneto-optical sensor. A current is determined from a polarization of the reflected or transmitted light signal.

The invention belongs to the technical field of quality detection, and discloses a high-precision semiconductor device packaging quality detection system. Comprising the following steps: acquiring electrical performance data including current, resistance and voltage data; correcting the current data by using a magneto-optical temperature correction method; calculating resistance and voltage data based on the corrected current data; the obtained thermal performance data comprises junction temperature and thermal resistance data; calculating junction temperature data of the high-precision semiconductor device by using an improved Kalman filtering algorithm; obtaining thermal resistance data based on the junction temperature data; preprocessing the electrical performance data and the thermal performance data to obtain a preprocessed data set; based on the preprocessed data set, inputting the preprocessed data set into a pre-trained auto-encoder model, and predicting to obtain a packaging quality index; judging whether the packaging quality of the high-precision semiconductor device is qualified or not according to the packaging quality index; and the accuracy and the reliability of packaging quality detection of the high-precision semiconductor device are effectively improved.