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129 results about "High frequency modulation" patented technology

Precision marketing recommendation system based on AI large model

The invention discloses a precision marketing recommendation system based on an AI large model, relates to the technical field of information recommendation, is used for improving the problem of product information recommendation efficiency reduction caused by tag recommendation delay, and comprises the steps of collecting user data, analyzing user information frequency modulation potentials by using a K nearest neighbor algorithm, performing classification, screening out users with high frequency modulation potentials, and performing recommendation on the users with high frequency modulation potentials. The method comprises the following steps: setting detection time to collect recommendation information data of a user, screening key tags from the recommendation information data, calculating a tag demand coefficient, detecting a user emptying behavior, carrying out secondary screening on the key tags to obtain evaluation tags, and judging whether demand down-regulation processing is carried out on the evaluation tags by utilizing a corrected geometric average method. And marking the evaluation labels requiring down-regulation processing, obtaining label attributes of the marked labels, calculating down-regulation coefficients of different marked labels according to the label attributes of the marked labels and the label demand coefficients, and setting skipping time for the marked labels according to the down-regulation coefficients.
Owner:SHENZHEN LUXE IND INTERNET CO LTD

HRR-based acoustic fire type identification method, apparatus and device, and medium

The invention discloses an HRR-based acoustic fire hazard type identification method, device and equipment and a medium, and relates to the technical field of fire hazard detection, and the method comprises the steps: obtaining an original acoustic signal through transmitting a high-frequency modulation ultrasonic wave and receiving a flame region reflection echo, obtaining channel impulse response data through channel estimation, and carrying out the channel impulse response data; flame features are extracted, a heat release rate curve is calculated and generated, finally fire type identification and fire behavior stage determination are completed based on the curve, dense smoke, shielding and illumination interference can be resisted, accurate quantification of the heat release rate is realized, fire type identification and fire behavior development stage determination can be finely carried out, and the accuracy of fire behavior determination is improved. And a stable and reliable technical support is provided for fire monitoring and emergency decision making.
Owner:HUNAN UNIV

High-speed communication method and system for perforation of single-core cable

The invention belongs to the technical field of oil and gas well perforation, and relates to a high-speed communication method and system for single-core cable perforation. The method comprises the following steps: performing low-frequency modulation on underground perforation data; performing high-frequency modulation on underground logging data; synthesizing carrier signals; the driving power of the carrier synthesis signal is amplified, so that the carrier synthesis signal is transmitted to the ground end on the single-core cable; the ground terminal carries out carrier signal conditioning on the carrier synthesis signal and then carries out amplification processing; carrying out carrier signal separation, and respectively outputting a low-frequency modulation signal and a high-frequency modulation signal; and outputting perforation data and logging data. According to the invention, perforation signals and underground logging data can be transmitted on the single-core cable at the same time, and the exploitation efficiency of an oil-gas well is improved; according to the single-core cable perforation communication system, continuity and low delay characteristics of perforation operation signals are kept, discrete data can be selectively transmitted, the efficiency of single-core cable perforation communication is improved, and mutual influence of perforation or logging communication faults is effectively avoided.
Owner:CHUANNAN ENERGY TECH CO LTD

High frequency modulation chopper

A system for evaluating a sample, the system includes (i) a chopper that includes (i.1) a disc that is made of a transparent material that bears an inner opaque pattern and outer opaque pattern, the outer opaque pattern surrounds the inner opaque pattern, and (i.2) a rotating unit that is configured to rotate the disc during a modulation period, (ii) first optics, (iii) second optics, (iv) a control unit that is configured to detect a second modulated beam from the second optics, and control the rotating unit based on at least one parameter of the second modulated beam.
Owner:NOVA MEASURING INSTR LTD

Virtual power plant decentration AGC method and system based on precise diffusion algorithm

The invention discloses a virtual power plant decentration AGC method and system based on a precise diffusion algorithm. According to the method, an AGC instruction decomposition model with optimal operation cost and highest frequency modulation performance as double optimization targets is designed according to the adjustment upper and lower limits of each resource and the actual line capacity constraint; a Lagrange multiplier of the model is decoupled, and an accurate diffusion algorithm is adopted to realize rapid and accurate solution of an instruction; and finally, an intelligent agent communication model containing communication noise is obtained. A precise diffusion algorithm is rewritten and a gain function is introduced, so that the precise diffusion algorithm has the capability of translating noise, and the robustness of the algorithm is improved.
Owner:ZHEJIANG UNIV

Transmissive communication system and method based on low-frequency carrier and high-frequency modulation

The invention discloses a transmission type communication system and method based on low-frequency carrier waves and high-frequency modulation. The transmission type communication system and method are suitable for complex medium environments such as deep sea, strata and biological tissues. Aiming at the contradiction that the traditional low-frequency communication bandwidth is insufficient and the high-frequency communication penetrating power is poor, according to the scheme, a low-frequency carrier wave (30Hz-100kHz) and a high-frequency modulation signal (such as OFDM (Orthogonal Frequency Division Multiplexing) and 256QAM (Quadrature Amplitude Modulation)) are fused through a nonlinear signal superposition technology to generate a composite carrier wave signal, long-distance penetration is realized by utilizing the low attenuation characteristic of the low-frequency carrier wave, and meanwhile, the data rate is improved through high-frequency modulation. Application scenes comprise deep sea detection (300-meter high-definition video return), a brain-computer interface (implantable antenna transmission neural signal) and an intelligent power grid (underground pipe network monitoring). Through the physical layer-information layer collaborative design, the physical boundary limitation of traditional communication is broken through, and high penetrability, high bandwidth and strong anti-interference capability are achieved.
Owner:王启枝

Excitation control system based on passive and wireless ultrasonic transducer

The invention belongs to the field of electronic circuits, and provides an excitation control system based on a passive and wireless ultrasonic transducer, which is characterized in that a first transmitting circuit receives a high-frequency excitation signal and generates a high-frequency electromagnetic wave signal after power amplification; the pulse excitation circuit based on the PNP triode rectifies the received high-frequency electromagnetic wave signal and stores energy, and generates an instantaneous pulse excitation signal; the second transmitting circuit receives the high-frequency carrier signal, provides the high-frequency carrier signal to a passive wireless ultrasonic transducer end after power amplification, and sends a demodulation reference signal to the receiving circuit; the passive wireless ultrasonic transducer end excites a low-frequency ultrasonic signal of which the frequency is the same as the resonant frequency, and after the high-frequency carrier signal is received, the low-frequency ultrasonic signal and the high-frequency carrier signal are subjected to frequency mixing modulation to obtain a high-frequency modulation signal; and the receiving circuit filters and amplifies the high-frequency modulation signal and then performs frequency mixing demodulation on the high-frequency modulation signal and a demodulation reference signal to obtain a low-frequency ultrasonic sensing signal. The power of the ultrasonic transducer can be improved.
Owner:SICHUAN UNIV

Temperature control device for non-magnetic packaging VCSEL laser

A temperature control device for a non-magnetic packaging VCSEL laser comprises a main control module which adopts NI equipment and a LabVIEW program, provides high-resolution data acquisition and real-time PID parameter adjustment, and realizes accurate temperature control. And the high-frequency modulation module shifts the temperature control signal to a high frequency band to suppress low-frequency magnetic field noise. The power supply module is composed of a switching power supply and a voltage stabilizing circuit, provides a stable power supply for the power amplifier operational amplifier and the radiator, and reduces noise and transient interference. The power amplification module is composed of two stages of amplification circuits, and a low-noise amplifier and a high-frequency current feedback amplifier are adopted to achieve efficient power amplification of signals. The heating module comprises a double-layer 2N polar distance heating film and an NTC negative feedback thermistor, the upper magnetic field and the lower magnetic field of a heating coil are mutually offset, non-magnetic heating is ensured, meanwhile, the NTC thermistor is combined for accurate temperature measurement, current is controlled in cooperation with a PID algorithm, and temperature stability is ensured. Compared with the prior art, the device has remarkable advantages in the aspects of non-magnetic heating, low-noise power supply and temperature control precision.
Owner:BEIHANG UNIV

Signal processing circuit for tunneling magnetoresistance sensor

A signal processing circuit for a tunneling magnetoresistance sensor comprises thirty-eight MOS transistors, two capacitors and ten switches. A first switch, a second switch, a third switch, a fourth switch, a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor form a high-frequency modulation circuit. A fifth switch, a sixth switch, a seventh switch, an eighth switch, a seventeenth transistor, a twenty-second MOS transistor and a twenty-third MOS transistor form a high-frequency demodulation circuit. A signal output by a tunneling magnetoresistance sensor is modulated to a chopping frequency by the high-frequency modulation circuit, and is then demodulated by the high-frequency demodulation circuit.
Owner:WENZHOU UNIV

Virtual power plant distributed power generation instruction distribution method and system for power distribution network

The invention discloses a virtual power plant distributed power generation instruction distribution method and system for a power distribution network, and the method comprises the steps: firstly carrying out the linearization of a power distribution network AC power flow model, carrying out the modeling of the line active power and node voltage in the power distribution network, and representing the node voltage and the line active power as the mapping of the node power variation; setting constraint conditions including a power balance constraint, a node voltage constraint, a line capacity constraint, an adjustable unit power adjustment upper and lower limit constraint and a climbing rate constraint of each adjustable unit, and constructing a power generation instruction scheduling optimization model taking the highest frequency modulation performance and the lowest carbon emission as double optimization targets; and finally, solving the power generation instruction scheduling optimization model in each control period by adopting a Nesterov momentum acceleration-based distributed algorithm to realize rapid and accurate solving of the instruction, and setting a communication condition to reduce the communication pressure during distributed information exchange and improve the convergence speed of the model. The method is high in convergence speed and high in precision.
Owner:ZHEJIANG UNIV

Dark target enhancement device and method based on range gating polarization imaging

The invention belongs to the technical field of photoelectric detection imaging, and particularly relates to a dim target enhancement device and method based on range gating polarization imaging, the device comprises a transmitting system and a receiving system, the transmitting system comprises a pulse laser, a signal modulation circuit and a transmitting optical system; the pulse laser is used for emitting laser beams; the signal modulation circuit is used for generating a high-frequency modulation electric signal and modulating a laser beam emitted by the pulse laser; the emission optical system is used for focusing and adjusting the light beam direction and the emergent light polarization state; the receiving system comprises a receiving optical system, a focal plane polarization detector, a synchronous control board, a signal processing board, an image processing board and display control equipment; according to the device, the pulse illumination module, the time synchronization control module and the polarization imaging module are integrated, and an image definition evaluation algorithm is combined, so that synchronous acquisition and fusion of target polarization information and distance information are realized.
Owner:AEROSPACE SCI & IND MICROELECTRONICS SYST INST CO LTD

ZCT soft switching DC / DC converter

The invention discloses a ZCT soft switching DC / DC converter, which comprises a four-switch tube series main power bridge arm circuit, a passive auxiliary resonance circuit, a voltage and current commutation circuit and an isolation rectification filter circuit, and is characterized in that the main power bridge arm circuit is used for transmitting input power energy; the passive auxiliary resonance circuit is used for cooperating with the working mode of the main power bridge arm circuit, eliminating the switching loss of two high-frequency power switch tubes which are auxiliary switch tubes for each other in the main power bridge arm circuit, and achieving zero-current soft switching. The commutation circuit is used for voltage and current phase switching; the isolation rectification filter circuit is used for rectifying the voltage of the primary side so as to output smooth DC voltage. The two high-frequency modulated power switch tubes serve as main and auxiliary switch tubes of output current in different quadrants, zero-current soft switching of the two high-frequency power switch tubes is achieved on the basis that power switch devices are not increased, switching loss is reduced, efficiency is improved, the working frequency of a system is improved, and the system reliability is improved. The size of the output filter is reduced.
Owner:南京杰芯源科技有限公司

Electro-magnetic synchronous motor sensorless control method based on rotor switching signal

The invention discloses a sensorless control method for an electrically excited synchronous motor based on a rotor switching signal, and relates to the technical field of motor control, the inherent high-frequency modulation switching signal of an EESM rotor circuit (in a buck converter form) is utilized, and an effective stage (AS) and an ineffective stage (IAS) are divided based on the unipolarity characteristic of a rotor modulation voltage; a stator current gradient is directly calculated at the AS to extract position information, a fundamental current component is estimated at the IAS to be used for compensation, magnetic coupling saturation compensation and rotor PWM frequency optimization are combined, and full-rotating-speed sensorless control is achieved.
Owner:ANHUI TECHN COLLEGE OF MECHANICAL & ELECTRICAL ENG

Digital jitter zero offset frequency locking system and method

The invention discloses a digital jitter zero-offset frequency locking system and method, and the system comprises the steps that a laser processing unit carries out the optical frequency mixing of reference laser transmitted by a reference laser and local oscillator laser with jitter frequency, and inputs a mixed optical signal to a balance detector; the balance detector outputs a beat frequency signal to the digital phase-locked loop according to the mixed optical signal; the digital phase-locked loop processes an error signal in the beat frequency signal to obtain a low-frequency modulation signal and a high-frequency modulation signal, the working current of the local oscillator laser is controlled through the low-frequency modulation signal, and the working voltage of the phase modulator is controlled through the high-frequency modulation signal. Phase errors cannot be generated due to frequency deviation between reference light and local oscillation light, so that transfer from the frequency deviation to phase noise is eliminated, then error signals are allowed to be filtered and processed in a plurality of modes by constructing a digital phase-locked loop, the performance under low-power frequency locking is improved, and long-term stability degradation is avoided.
Owner:CSRAYZER OPTICAL TECH CO LTD

Power optimization distribution control method based on wind storage combined frequency modulation system

The invention relates to the technical field of power system frequency control, and particularly discloses a power optimization distribution control method based on a wind storage combined frequency modulation system, which comprises the following steps of: synchronously acquiring a power grid frequency modulation instruction, wind power output, an energy storage charge state and adjustable power capacity data; extracting wind power fluctuation frequency and amplitude characteristics and energy storage charge and discharge depth and response rate characteristics; by taking the features as state constraints, constructing a multi-objective optimization model taking the highest frequency modulation tracking precision and the minimum energy storage life loss as objectives, and solving the multi-objective optimization model to obtain a power optimal distribution coefficient; generating a wind power smoothing instruction and an energy storage amplitude limiting instruction according to the coefficient, and issuing and executing; collecting actual response data to calculate deviation, and dynamically correcting a weight coefficient and a constraint boundary of the optimization model; according to the invention, dynamic collaborative optimization of wind storage power is realized, and energy storage cycle loss and response deviation can be reduced.
Owner:CHINA RESOURCES NEW ENERGY (FAKU) CO LTD

Laser Swept-Frequency Ranging Device and Method

The present invention provides a laser frequency-swept ranging device and method. The device includes a laser, an electro-optic modulator, a beam splitter prism, a first detector, a second detector, an analog phase detector, a measurement control circuit, and a modulation frequency source. The laser is used to emit a laser signal. The electro-optic modulator is used to intensity-modulate the laser signal to output a modulated signal. The beam splitter prism divides the modulated signal into two paths. One path is received by the first detector to generate a reference signal. The other path is reflected back by the target to be measured and then received by the second detector after being reflected by the beam splitter prism to generate a measurement signal. The analog phase detector is used to detect the phase difference between the reference signal and the measurement signal. The measurement control circuit is used to perform frequency-sweeping control on the output frequency of the modulation frequency source to generate a high-frequency modulated signal that changes according to a preset step size and feedback it to the electro-optic modulator. It is also used to determine two adjacent modulation frequencies by detecting the zero-phase difference signal and calculate the measurement distance of the target to be measured based on the two adjacent modulation frequencies.
Owner:INST OF MICROELECTRONICS CHINESE ACAD OF SCI LTD

Selective high frequency spinal cord modulation for inhibiting pain, including cephalic and / or total body pain with reduced side effects, and associated systems and methods

ActiveUS12491365B2Spinal electrodesExternal electrodesWhole body painSide effect
Selective high-frequency spinal cord modulation for inhibiting pain with reduced side effects and associated systems and methods are disclosed. In particular embodiments, high-frequency modulation in the range of from about 1.5 KHz to about 50 KHz may be applied to the patient's spinal cord region from an epidural, cervical location to address at least one of high back pain, mid-back pain, low back pain, and leg pain without creating paresthesia in the patient.
Owner:NEVRO CORP

Liquid crystal grating and driving method thereof, and three-dimensional display device

Embodiments of the present invention disclose a liquid crystal grating, a driving method thereof, and a three-dimensional display device. The liquid crystal grating is used to modulate incident light and output deflected outgoing light; the incident light includes at least a first incident light and a second incident light, the first incident light being modulated by the liquid crystal grating to output a first outgoing light, and the second incident light being modulated by the liquid crystal grating to output a second outgoing light, and the optical band of the first incident light and the optical band of the second incident light at least partially do not overlap; when the liquid crystal grating modulates the first incident light and the second incident light, at least one of the minimum value of the corresponding modulation voltage and the modulation duration is different. The embodiments of the present invention optimize the high-frequency modulation performance of the liquid crystal grating and enhance the display effect by setting at least one of the minimum value of the corresponding modulation voltage and the modulation duration to be different when the liquid crystal grating modulates different incident light.
Owner:SHANGHAI TIANMA MICRO ELECTRONICS CO LTD

Fused salt heat storage and compressed air energy storage coupled coal power unit regulation and control method and system

The invention discloses a coal power unit regulation and control method and system coupling fused salt heat storage and compressed air energy storage, and the method comprises the following steps: an energy storage stage: heating fused salt and compressed air energy storage by using redundant electric power of a coal power unit, and meanwhile, heating the fused salt by using compression heat generated in a high-temperature and high-pressure steam and compressed air energy storage process; in the energy release stage, the fused salt releases the stored heat, the heat is transferred to the coal power unit through the heat exchanger, and meanwhile, the compressed gas enters the expansion machine to do work after being heated by the heat exchanger to drive the coal power unit to generate power; and in the frequency modulation stage, a graded frequency modulation mode is determined based on the frequency difference between the real-time frequency and the rated frequency of the power grid, and the optimal power distribution scheme of the coal power unit, the fused salt heat storage and the compressed air energy storage in the frequency modulation process is determined by taking frequency modulation income maximization as an optimization target. The method can better adapt to the complex fluctuation of the power grid frequency, and the cooperation of the wide heat storage capacity and the high frequency modulation rate of the coal power unit is realized.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY

Semiconductor lamp control method and intelligent electric appliance

The invention relates to a semiconductor lamp control method and an intelligent electric appliance, which are applied to the field of intelligent electric appliances, and the semiconductor lamp control method comprises the following steps: driving a semiconductor lamp to illuminate through a high-frequency sine wave current signal; the high-frequency sine wave current signal is obtained by modulating an original current signal for driving the semiconductor lamp to illuminate; collecting a current output signal output by the photoelectric sensor when the semiconductor lamp illuminates; determining the attenuation degree of the semiconductor lamp through a lock-in amplifier based on the phase difference between the high-frequency modulation current signal and the current output signal; and controlling the semiconductor lamp based on the attenuation degree. According to the invention, the problem of illumination response delay caused by aging of the semiconductor lamp is solved.
Owner:NINGBO FOTILE KITCHEN WARE CO LTD

Electronic cigarette cartridge communication encryption system and method based on high-frequency analog signal

The invention provides an electronic cigarette cartridge communication encryption system and method based on a high-frequency analog signal, and the method comprises the steps: applying a high-frequency sweep frequency excitation signal to a cartridge through a dual-contact path shared by communication and heating after the cartridge is inserted; acquiring a response voltage signal of the smoke cartridge, and extracting a frequency domain amplitude feature from the response voltage signal to form a feature vector representing the physical identity of the smoke cartridge; generating an authentication factor based on the feature vector, and generating a carrier frequency and a response time window parameter required by communication; constructing a high-frequency modulation signal containing phase and amplitude disturbance according to the authentication factor and the modulation parameter, and sending the high-frequency modulation signal to the smoke cartridge through the double-contact path; receiving a reflection echo signal returned by the smoke cartridge end, carrying out time domain and phase characteristic analysis on the reflection echo signal, judging whether the response time is in an expected time window or not and whether the phase structure is matched or not, and outputting an authentication result; and executing a corresponding action according to the authentication result.
Owner:SHENZHEN ZHONGTING TECH CO LTD

Industrial power-saving system and method based on multi-frequency-band conflict avoidance and energy feedback

The invention discloses an industrial power-saving system and method based on multi-frequency-band conflict avoidance and energy feedback, and relates to the technical field of industrial power-saving systems.The method comprises the steps that a power grid fundamental wave synchronizing signal is obtained through a zero-cross detection circuit, an integrating circuit is input to generate a slope time-base signal, and the time-base signal is used for controlling the triggering moment of a high-frequency modulation pulse; the method comprises the following steps: modulating a pulse to intensively act on wave crest and wave trough areas of an AC voltage waveform, exciting an LC resonant circuit connected to a DC side of an electric energy conversion device by the modulating pulse to enable the LC resonant circuit to enter a quasi-resonant state in a phase interval, and actively releasing energy to a load by an energy storage capacitor; the system is controlled to be switched on preferentially, power supply competition for a main power supply is formed, main current output is correspondingly reduced on the premise that load power is not changed, energy conservation and consumption reduction are achieved, and the system further improves electric energy quality and operation stability through unified clock synchronization, phase out-of-sequence control, energy local circulation and impedance frequency band avoidance.
Owner:高冠武

Superconducting Synchrocyclotron with Simultaneous Acceleration of Multiple Ion Species and Hadron Therapy Facility

Superconducting synchrocyclotron (1) comprising: At least two ion sources (30, 33) for producing respectively a so-called "therapy" beam and a so-called "imaging" beam, an axial injection line, a high-frequency modulation device (23) for producing within the synchrocyclotron a cyclic frequency law F(t) allowing the simultaneous acceleration of the ions of the therapy and imaging beams, a rotary path modulator (110), two beam cut-off devices (34, 35) upstream of the median acceleration plane for modulating the therapy and imaging beams synchronously with the rotation of the path modulator (110). Figure for abstract: Fig. 5
Owner:AIMA DEVELOPPEMENT

In-situ detection method and system for ethyne in oil based on coated hollow core fiber enhancement

The application provides an in-situ detection method and system for acetylene in oil based on coated hollow core fiber enhancement, relates to the technical field of optical gas sensing, and specifically captures and enriches acetylene molecules from transformer oil flowing through a selective adsorption film modified on the inner wall of a coated hollow core fiber, so that the local concentration of the acetylene molecules in the coated hollow core fiber sensing probe detection is increased by tens of times, the enriched acetylene molecules are excited by high-frequency modulated mid-infrared pump laser, the periodic photothermal effect generated is sensitively detected by in-phase transmission near-infrared detection laser in the form of phase change, the super-high sensitivity detection can be maintained, the fast response meeting the early fault warning requirement is also satisfied, differential detection is simultaneously performed on the signal generation, temperature compensation, filter adjustment and frequency adjustment are simultaneously performed, the four-stage linkage processing mechanism is utilized to perform hierarchical processing on the signal, so that the whole system can not only resist wide temperature range and strong electromagnetic environment, but also adaptively resist time-varying field interference.
Owner:WUHAN HAOMAI OPTOELECTRONICS TECH CO LTD

High-speed polarization encoding device, method and quantum communication system

The application provides a high-speed polarization encoding device, method and quantum communication system, the device comprising: a polarization beam splitter, a transmission light path, a first phase modulator and a first high-speed driver; the first high-speed driver is connected with the first phase modulator, and is used for applying a high-frequency modulation signal with a frequency higher than a specified threshold to the first phase modulator; the polarization beam splitter receives an optical pulse through a first port, and splits the optical pulse into a first sub-optical pulse and a second sub-optical pulse; the first phase modulator is used for phase modulating the first sub-optical pulse and the second sub-optical pulse with different modulation efficiencies based on the high-frequency modulation signal; and the polarization beam splitter is further used for combining the first sub-optical pulse and the second sub-optical pulse after phase modulation by the first phase modulator, and outputting the obtained combined optical pulse through the first port. In this way, the purpose of high-stable polarization quantum state encoding of 10GHz or higher speed is achieved.
Owner:CHINA ACADEMY OF ELECTRONICS AND INFORMATION TECHNOLOGY OF CHINA ELECTRONICS TECHNOLOGY GROUP CORPORATION

Annular microcavity quantum cascade laser and preparation method thereof

The invention discloses an annular micro-cavity quantum cascade laser. The laser comprises substrates which are sequentially arranged from bottom to top; the annular microcavity is arranged on the substrate, the annular microcavity is an elliptical resonator with a notch, and a groove is formed in the central area of the annular microcavity; the semi-insulating InP: Fe filling layer is arranged in the groove in the central area of the annular microcavity, and the difference between the resistivity of the semi-insulating InP: Fe filling layer and the refractive index of the upper cladding and the contact layer is less than 1%; the supporting ridges are arranged on the substrate, and the two supporting ridges are arranged on the two sides of the annular microcavity and are as high as the annular microcavity; the coplanar electrode comprises a central electrode arranged on the upper surface of the annular microcavity and grounding electrodes symmetrically arranged on the outer surface of the supporting ridge structure, and the central electrode and the grounding electrodes are the same in height. The quantum cascade laser has high-frequency modulation performance, improves heat dissipation performance, and has high response rate.
Owner:QIMING PHOTONICS (BEIJING) TECHNOLOGY CO LTD

Weak ocean electric field measuring system with high Q quartz crystal oscillator frequency conversion resonance matching

The application provides a weak ocean electric field measurement system with high Q quartz crystal oscillator frequency conversion resonance matching, which realizes high sensitivity and super high signal-to-noise ratio of seawater electric field measurement with small volume / interval. The application uses switch to alternately turn on and off metal mesh and shield cover, improves seawater electric field modulation frequency, realizes high Q resonance matching by parallel connection of multiple quartz crystal oscillators with the same characteristics, obtains passive amplification, greatly improves high-frequency modulation electric field amplitude and signal-to-noise ratio, so that the small volume / interval sensor can also obtain large electric field response. The electric field measurement method has the characteristics of small volume, high sensitivity and high signal-to-noise ratio, and can not only be flexibly arranged in various very weak electric field detection, but also can constitute a phased array electric field sensor to measure long-distance seawater electric field distribution, greatly expanding the field of ocean electric field measurement.
Owner:SHANGHAI JIAOTONG UNIV

Nanotube transistor structure with auxiliary anode and driving method

PendingCN122158420ANanoinformaticsNon-electron-emitting anodesCapacitanceNanotube
The application discloses a nano-channel transistor structure with an auxiliary anode and a driving method. The structure comprises an insulating substrate, a cathode, a gate and an anode which are made on the substrate, and at least one auxiliary anode is additionally arranged on the side of the anode away from the cathode. The auxiliary anode and the anode can have a height difference. By applying different direct-current voltages, a regulating electric field is formed between the anode and the auxiliary anode, the moving direction and speed of the electrons passing through the anode are changed, and the electrons are collected by the anode or directly collected by the auxiliary anode. The application also provides a corresponding driving method. The gate applies a direct-current bias voltage superimposed with a high-frequency modulation signal, and the anode and the auxiliary anode respectively apply direct-current voltages. The amplified high-frequency signals collected by the anode and / or the auxiliary anode are output through a capacitor, and the multi-output signals can be superimposed after the phase compensation system makes the phases of the multi-output signals consistent. The application effectively improves the utilization efficiency of the cathode emitted electrons and the total output current of the device.
Owner:SOUTHEAST UNIV

Stroboflash-free eye-protection lamp based on high-frequency constant-current driving and control method thereof

The invention belongs to the technical field of illumination control, and particularly relates to a stroboflash-free eye-protection lamp based on high-frequency constant-current driving and a control method thereof, and the stroboflash-free eye-protection lamp comprises a power conversion module, a high-frequency constant-current driving module, a light source module, a current sampling module, a signal processing module and a feedback adjustment module. The power supply conversion module is used for accessing power frequency alternating current electric energy, rectifying and filtering the power frequency alternating current electric energy and outputting direct current basic voltage; and the high-frequency constant-current driving module is connected with the power supply conversion module and is used for receiving the direct-current basic voltage, converting the direct-current basic voltage into high-frequency pulse voltage and driving the light source module to work in a high-frequency modulation mode. According to the utility model, the visual comfort of the light source can be improved, the problem of low-frequency pulsation existing in a simple direct-current conversion circuit is effectively solved, it is ensured that no stroboscopic stripe appears in a fast moving sight line or a shooting scene, and the technical advantage and the practical value are remarkable.
Owner:SHENZHEN BRIGHT STAR TECH CO LTD

Customised microchip for generating electrical stimulation pulses

PCT designated stage expiredWO2025040937A1Ear treatmentImplantable neurostimulatorsConvertersControl cell
A microchip for generating stimulation pulses comprising a power management unit, a demodulation unit, a decoder unit, a control unit, a current generator, a digital to analogue converter, a stimulation unit, and a back telemetry unit, wherein the microchip may be configured to receive a high frequency modulated signal (data signal) from an external part of an implantable auditory prosthesis. The data signal may be demodulated to a primary signal comprising a main signal encoded with a clock signal in order to generating stimulation pulses. The stimulation pulses may be applied to an implantee's cochlear nerves to restore implantee's auditory function.
Owner:TANIN PARDAZ PASARGAD