40 results about "Magneto optical" patented technology

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 application relates to the technical field of optical modulation, in particular to a magneto-optical modulation device, which comprises an active layer, the active layer comprising a two-dimensional Dirac material; a first dielectric layer and a first magnet, the first dielectric layer being located on a first surface, and the first magnet being located on a side of the first dielectric layer away from the active layer; a second dielectric layer and a second magnet, the second dielectric layer being located on a second surface, and the second magnet being located on a side of the second dielectric layer away from the active layer, the first magnet and the second magnet being used for forming a magnetic field, and a magnetic field direction of the magnetic field being parallel to a first direction; a first transparent electrode plate and a second transparent electrode plate, the first transparent electrode plate and the second transparent electrode plate being respectively located on a first side and a second side, and the first transparent electrode plate and the second transparent electrode plate being used for forming an electric field, and an electric field direction of the electric field being parallel to a second direction.The application is at least beneficial to improving the sensitivity and controllability of the magneto-optical modulation device to light modulation.

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 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 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 provides a magnetic detection device based on diamond NV centers and the Kerr effect. It achieves the sharing of light sources and optical paths between magnetic detection technologies based on the magneto-optical Kerr effect and those based on NV centers, combining the two technologies and greatly simplifying the device structure. This increases the intensity of the optical signal received by the detection module, reduces noise interference in the signal, and thus improves the accuracy of magnetic detection. It can simultaneously meet the requirements of rapid and high-resolution detection, and improve the overall detection speed while ensuring detection accuracy.

This application discloses a display module, comprising: a display device including multiple sub-pixels and a semi-transparent, semi-reflective layer; a dimming component disposed on one side of the light-emitting surface of the display device, including a magneto-optical modulation layer and a polarizer disposed on the side of the magneto-optical modulation layer away from the display device; the magneto-optical modulation layer includes a stacked magnetic field shielding layer, a magnetizing element, and a magneto-optical medium layer, the magnetic field shielding layer being located on the side of the magnetizing element closer to the display device; the polarizer is used to modulate incident ambient light into first linearly polarized light; the magneto-optical medium layer is used to modulate the first linearly polarized light into second linearly polarized light under the drive of the magnetizing element; the semi-transparent, semi-reflective layer is used to reflect the second linearly polarized light to the magneto-optical medium layer; the magneto-optical medium layer is used to modulate the second linearly polarized light into third linearly polarized light, the third polarization angle of the third linearly polarized light being perpendicular to the first polarization angle of the first linearly polarized light. Through the above configuration, interference from ambient light is isolated, contrast is improved, and the light transmittance of the sub-pixels is guaranteed.

This invention discloses an intelligent physiotherapy control system and method based on multi-scenario, multi-element collaboration, relating to the field of physiotherapy technology. The method includes the following steps: performing short-time Fourier transforms on the driving waveform of the magnetotherapy module and the excitation waveform of the phototherapy module respectively, extracting the dominant frequency component, harmonic frequency band, and energy density parameters within each working cycle, and constructing a set of magnetic-optical dual-channel spectral feature vectors; based on the spectral feature vector set, calculating the relative frequency ratio and energy superposition ratio between the dominant frequency point of magnetotherapy and the dominant frequency point of phototherapy and their higher harmonics, obtaining a spectral coupling degree index. This invention achieves quantitative assessment of the risk intensity of magnetotherapy and phototherapy by constructing a joint resonance superposition degree, and dynamically adjusts the waveform timing based on this index. By delaying the rising edge and limiting the conduction time, it achieves peak-shifting control of energy output, effectively reducing instantaneous superposition density and improving physiotherapy safety and system adaptability.

This invention belongs to the field of ultrafast spectroscopy technology, specifically relating to a system and method for parallel measurement of transient absorption spectroscopy and magneto-optical polarization. The system comprises: a femtosecond laser, a first beam splitter, a pump pulse adjustment component, a probe pulse adjustment component, a second beam splitter, a beam combiner, a focusing and imaging device, a third beam splitter, a spectral measurement device, and a polarization measurement device. This system can simultaneously measure transient absorption spectroscopy and magneto-optical polarization.

The application discloses a kind of high-conductivity insulation halogen-free fireproof special cable and its preparation method and application, belong to cable manufacturing technical field.Cable is from inside to outside by composite conductor layer, inner wrapping tape layer, inner insulation layer, outer insulation layer, shielding layer, outer wrapping tape layer and sheath layer composition;Composite conductor layer is formed by the stranding of multiple composite conductor filaments;Composite conductor filament is from inside to outside by three layers, respectively as: core copper, inner surface layer and outer surface layer;Inner surface layer is 18-32nm thick amorphous-nanocrystalline composite copper layer;Outer surface layer is 35-78nm thick graphene layer.The cable of the application has high conductivity, strong insulation and fire resistance, non-toxic fire resistance and other characteristics.The preparation method of the application significantly improves the conductivity, mechanical strength and high-temperature stability of the conductor through thermal-magnetic-optical multi-field coupling.

This invention relates to a scandium-terbium-gallium garnet magneto-optical crystal without radial stripes and its preparation method. The Tb3Sc crystal was grown using the Czochralski method. x Ga 5‑x O 12 The magneto-optical crystal (where x = 0.05–0.3) belongs to the cubic crystal system and has the space group Ia–3d. This method utilizes a small amount of Sc... 3+ Partial Ga doping 3+ This helps suppress the formation of spiral dislocation-related defects, enabling the growth of high-quality terbium gallium garnet magneto-optical crystals without radial stripes. Low-concentration Sc 3+ The doping strategy has shown excellent results in addressing the radial stripe defect in TGG crystals and improving their key performance characteristics, providing a practical new approach for the fabrication of core materials for magneto-optical devices. This crystal material is expected to find practical applications in magneto-optical devices such as magneto-optical isolators, magneto-optical circulators, and magneto-optical modulators.

The application discloses a construction of a magneto-optical photonic crystal waveguide and a nontrivial one-way bulk state robust transmission method. The waveguide can excite a reverse-handed one-way boundary state and a one-way bulk state with reverse transmission simultaneously by parameter design of a square magneto-optical photonic crystal waveguide. The reverse-handed one-way boundary state is absorbed by upper and lower boundary conditions with scattering boundary conditions. Under the strong light transmission restriction of the square magneto-optical photonic crystal, the one-way bulk state is limited in the strip to transmit in one direction, thereby avoiding being absorbed, so that the waveguide forms a nontrivial one-way bulk state. The structure is topologically protected, and the nontrivial one-way bulk state robust transmission with complete one-way conductivity of the waveguide channel is realized. Further, the controllability of the nontrivial one-way bulk state transmission frequency can be realized by adjusting the magnetic field strength. The application has wide application prospects in the fields of robust energy transmission, optical communication technology and integrated photonic circuit.

The utility model relates to a kind of high off ratio multi-channel magneto-optical switch, including 1×N magneto-optical switch;N=2n, n is the integer greater than or equal to 2;1×N magneto-optical switch is constituted by a 1×2 magneto-optical switch series connection;The input end of 1×N magneto-optical switch is equipped with an input collimator;The output end of 1×N magneto-optical switch is respectively connected with N output collimators;1×1 magneto-optical switch is equipped between the output end of 1×N magneto-optical switch and output collimator;The utility model is by setting 1×1 magneto-optical switch at each output collimator, 1×1 magneto-optical switch is not only used for the output of signal, also constitutes isolator device, effectively promotes the off ratio of any channel, so that the off ratio of each channel of 1×N magneto-optical switch is greater than 40dB, and the structure also realizes the demand of high isolation degree;The series connection structure of 1×2 magneto-optical switch can effectively component multi-channel magneto-optical switch, simplify structure.

FIELD: inorganic chemistry.SUBSTANCE: invention can be used in magnetic, optical, magneto-optical, X-ray and resonance studies, as well as in new generation synchrotron technologies. A charge is prepared comprising, by wt.%: (Fe2O3 + Ga2O3) 4.9; B2O3 58.3; PbO 25.0; PbF2 11.8. The prepared charge is melted in small portions into a platinum crucible at 870 °C, which is then placed in the gradient-free zone of the growth furnace and heated for melting to 900 °C for 4 hours. A platinum crystal holder is lowered into the resulting melt solution, rotating it at a speed of 20-60 rpm, and homogenized at this temperature, holding for 20-24 hours. After this, temperature surges are carried out cyclically, consisting of rapid cooling with holding and heating with holding. During the first and second cycles of temperature surges, the temperature is sharply reduced to 800-820 °C for 20 minutes and maintain at this temperature for 2-4 hours, then heat to 900 °C for 20 minutes and maintained at this temperature for 4-12 hours. In the third cycle, the temperature is sharply reduced to 800-810 °C for 20 minutes and kept at this temperature for 2-3 hours, then heated to 830-835 °C in 20 minutes and maintained at this temperature for 3-4 hours. After the specified temperature changes, the temperature is sharply reduced in 15 minutes to 805-810 °C and isothermal holding is carried out for 0.5-1 hour, during which the rotation of the crystal holder is turned off. Then smooth cooling is carried out at a rate of 0.1-0.3 °C / h up to 780 °C, the synthesized crystals are released from the crucible by smoothly removing the crystal holder from it at a speed of 0.5 cm / min. Final cooling of the furnace is carried out for 4-6 hours to a temperature of 500 °C with subsequent shutdown. The invention makes it possible to grow single crystals of Fe1-xGaxBO3, where 0≤x<0.2, in the form of plates up to 5 mm in diameter.EFFECT: improved performance.1 cl, 2 dwg, 3 ex

This invention proposes an orbital angular momentum circularly polarized antenna based on the chiral corridor mode of a magneto-optical photonic crystal. The antenna comprises a magneto-optical photonic crystal cluster and two metal plates. The cluster is composed of a periodically arranged array of magneto-optical photonic crystal cells, each with an applied bias magnetic field. The two metal plates are clamped to the upper and lower sides of the cluster, forming upper and lower electric walls to constrain the electric field direction. A perimeter fence surrounds the cluster, connecting to the two metal plates to form a corridor cavity supporting the chiral corridor mode. Multiple radiating slots are evenly spaced along the circumference on the top or sidewalls of the corridor cavity. These slots couple the confined electromagnetic modes within the cavity into directional radiation in free space. This invention utilizes the tensor permeability of the magneto-optical photonic crystal to construct the chiral corridor cavity. Through lateral slotted coupling radiation, it achieves pure excitation of high-order orbital angular momentum beams while simplifying the antenna structure and reducing feeding complexity.

Magneto-optical sensors for process or process chamber condition monitoring are described. In an example, a system includes a process chamber. The system also includes a laser source to provide a laser beam having an initial polarization, the laser beam to be directed through a first polarizer and then into the process chamber. The system also includes a magnet surrounding the process chamber, the magnet to provide a Faraday rotation of the laser beam, the laser beam to exit the process chamber and enter a second polarizer and then a detector to provide a detected polarization rotation for lock-in detection.

The self-calibrating polarization state measurement device and method based on the trust-domain reflection method belongs to the field of precision instrument manufacturing and measurement technology. The device includes an incident optical fiber, a collimator, a magneto-optical crystal module, a quarter-wave plate, an analyzer, an output optical fiber, and a packaging shell. The method obtains 16 output optical powers by changing the rotation angle of the four magneto-optical crystal modules. It uses an optical power meter to measure and processes the data using a trust-domain reflection optimization mathematical model and algorithm. It can realize the self-calibration of the polarization state measurement device and analyze the polarization state of the input light, and can overcome the influence of temperature, wavelength, assembly and measurement errors, and noise on the measurement accuracy.

This invention relates to the fields of oral medicine and nanomaterials, and particularly to a magneto-optical dual-response material, its preparation method, and its applications. The magneto-optical dual-response material comprises a magnetic response core, a biomimetic mineralization layer modified on the surface of the magnetic response core, and a photoresponsive outer layer modified on the surface of the biomimetic mineralization layer. The magnetic response core comprises superparamagnetic magnetite dendrites; the biomimetic mineralization layer comprises a hydroxyapatite nanocrystal array; and the photoresponsive outer layer comprises nanoenzymes. The magneto-optical dual-response material provided by this invention integrates magnetic targeting and mechanical removal of biofilms, near-infrared light synergistic sterilization, and biomimetic remineralization functions, aiming to overcome the passivity and limitations of existing technologies and achieve proactive, precise, and integrated prevention and treatment of early pit and fissure caries.

The present application belongs to the field of silicon-based optoelectronics, and particularly relates to a method for full tensor characterization of dielectric constant of magneto-optical film. The present application is based on transfer matrix method and modification of ellipsometer, and differential Mueller matrix of magneto-optical film under positive magnetic field and negative magnetic field is obtained by measurement of ellipsometer according to the characterization principle of transfer matrix method. Diagonal elements of dielectric constant tensor are obtained by fitting ellipsometric parameters according to structure model and dispersion model, and non-diagonal elements of dielectric tensor are obtained by parameter inversion of transfer matrix method. The present application firstly combines transfer matrix method and 4*4 Mueller matrix, and non-contact ellipsometric spectrum measurement is carried out under the condition of applied magnetic field by ellipsometer, so that full tensor characterization of dielectric constant of wafer-level magneto-optical film is realized without destroying wafer or carrying out sample processing, the vacancy of full tensor non-destructive characterization of dielectric constant of wafer-level magneto-optical film is filled, and the present application has great significance for further industrial application of magneto-optical film.

This method for producing a paramagnetic garnet-type transparent ceramic represented by formula (1) includes a step for adjusting a slurry containing a metal oxide powder raw material constituting formula (1) and a liquid medium, wherein the slurry has a median diameter D50 value of 250 nm to 1,500 nm in a particle size distribution at a concentration of 11±4 mass%, and a D95 value at a cumulative particle size distribution of 95% of 2,000 nm or less. In this method for producing a magneto-optical device, the paramagnetic garnet-type transparent ceramic is used as a Faraday rotator 110 to constitute an optical isolator 100.　(1): (Tb1-x-yRexScy)3(Al1-zScz)5O12 (in the formula, Re is Y and / or Lu, and 0≤x<0.45, 0<y<0.1, and 0<z<0.2

This application relates to the field of optical device technology, and discloses a Faraday rotator, its fabrication method, and an isolator. The Faraday rotator comprises multiple magneto-optical crystals and multiple heat-dissipating crystals, which are alternately stacked along the optical path. Embodiments of this application can overcome the thermal focus shift defect of the isolator without increasing the output beam diameter of the collimator.

The application discloses a magnetic field synergistic stimulation and electroencephalogram closed-loop feedback system and relates to the technical field of nerve regulation. The magnetic field synergistic stimulation and electroencephalogram closed-loop feedback system comprises a headband, a control box is arranged on the headband, a bone conduction loudspeaker and an LED lamp are arranged on the headband, an electromagnetic coil module is arranged on the headband, and an electroencephalogram signal acquisition module is arranged on the inner side of the headband. The magnetic field synergistic stimulation and electroencephalogram closed-loop feedback system generates an alternating magnetic field around a coil through a microcontroller control driving chip, realizes transcranial magnetic stimulation intervention, a main timer synchronously links from a timer through a hardware trigger signal TRGO, accurately controls the LED lamp to flicker with specific frequency, sends a matched audio signal to the bone conduction loudspeaker through a Bluetooth module, forms a'magnetic-light-sound' three-mode synergistic intervention, guides the brain to enter a relaxed and synchronized state, adjusts brain nerve oscillation rhythm, and realizes personalized and adaptive intervention based on real-time electroencephalogram feedback.

This invention discloses a method for detecting weak magnetic fields in space based on a mutually coherent magneto-optical sensor, relating to optical instruments. The invention splits the light source into a probe beam and a gain beam. The probe beam is transmitted through an optically rotating crystal and then combined with the gain beam, resulting in mutual coherence. An optical Fourier transform is performed, outputting a single-point magneto-optical signal as an interference fringe image. Finally, the spatially frequency-domain correlated light intensity gray values ​​in the interference fringe image are extracted. The constructive and destructive interference signals are further obtained and differentially processed to obtain twice the interference magneto-optical signal, thus enhancing the magneto-optical signal and suppressing noise.

Provided are a tweezer manipulation system based on a transduction device, a preparation method, and a manipulation method, relating to the field of physical field manipulation. The tweezer manipulation system comprises a transduction device and an external field control device. The transduction device generates a spatially gradient electric field under remote excitation by ultrasonic, magnetic, and optical fields generated by the external field control device, thereby achieving non-contact and non-destructive manipulation of objects in solid, liquid and gaseous phases on the basis of the dielectrophoretic force exerted on the objects under the gradient electric field. The tweezer manipulation system allows for coordinated regulation of the magnitude and direction of the dielectrophoretic force by means of the transduction device and the external field control device, enables manipulation of objects across size scales ranging from nanometers to centimeters, achieves precise manipulation of both single and multiple objects, and has huge application potential in the fields of chemical reactions, biochemical sensing, cell manipulation, and micro / nanorobots, etc.

Magneto-optical sensors for process or process chamber condition monitoring are described. In an example, a system includes a process chamber. The system also includes a laser source to provide a laser beam having an initial polarization, the laser beam to be directed through a first polarizer and then into the process chamber. The system also includes a magnet surrounding the process chamber, the magnet to provide a Faraday rotation of the laser beam, the laser beam to exit the process chamber and enter a second polarizer and then a detector to provide a detected polarization rotation for lock-in detection.

Disclosed is a magnetic field measuring probe with autonomous temperature compensation capability, wherein the magnetic field measuring probe comprises a magneto-optical crystal; a temperature probe end is adhered to an outer surface of the magneto-optical crystal via high-thermal-conductivity adhesive; and the magnetic field probe and the temperature probe are externally encapsulated with an epoxy encapsulation layer. The result of magnetic field measurement can be temperature-compensated, so that the relative error is greatly reduced, the temperature characteristic of the sensor is improved, and the measurement precision is improved.

This invention provides a method for designing and fabricating a Faraday rotator, a magneto-optical device, an apparatus, and equipment, relating to the field of magneto-optical device technology. The method includes: S1, performing proton irradiation resistance simulation evaluation on candidate materials and iteratively screening to obtain target components; S2, performing phase diagram design and stability analysis on the target components to determine the process window; S3, based on the process window, fabricating a proton irradiation-resistant Faraday rotator using liquid-phase epitaxy. This invention abandons the existing technology's reliance on empirical trial-and-error component screening mode, not only solving the problem that existing technologies cannot simultaneously consider the radiation resistance performance, phase stability, and process feasibility of components, but also solving the problem of the disconnect between design and fabrication processes in existing technologies, thus efficiently producing Faraday rotators that meet the requirements for proton irradiation resistance.

The present application relates to a kind of track crack detection devices based on magneto-optic, belong to crack detection technical field.The device includes: surface light source, for generating light beam;Magneto-optic sensor, at the surface of measured track preset distance, for sensing the leakage magnetic field generated by measured track due to crack in magnetic field environment, and leakage magnetic field information is modulated as the polarization state change of reflected light beam;Industrial camera, for collecting reflected light beam after being modulated by magneto-optic sensor, generate magneto-optic image;Control processing module is at least connected with industrial camera, for receiving magneto-optic image, and identifying crack in measured track.By the device, real-time online detection under normal running speed of train can be realized.And detection is not covered by surface contaminants such as oil stain, rust mark, water stain, dust.

The utility model discloses a kind of Faraday rotator and magneto-optical switch for magneto-optical switch, it is related to optical device technical field, wherein, Faraday rotator includes coil framework, magneto-optical crystal and multiple magnetic field generating components;Magneto-optical crystal is located at coil framework;Multiple magnetic field generating components are connected in parallel, multiple magnetic field generating components are spaced and arranged side by side, and from one end of coil framework, the other end of coil framework is wound, and single-layer solenoid inductance structure is formed;The technical scheme provided by the utility model can solve the problems of poor heat dissipation performance and slow switching speed of existing magneto-optical switch.