47 results about "High frequency modulation" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

The embodiment of the present application discloses a single-stage high-frequency modulation isolated power conversion circuit and a circuit control method, which are used in the technical field of power conversion. In the running moment of the power conversion circuit, the first ends of three groups of low-frequency bidirectional switches are respectively connected with different-phase input ends, and the second ends of the three groups of low-frequency bidirectional switches are connected with the direct-current level midpoints of a high-frequency bridge arm modulation module. In the running moment of the power conversion circuit, one-phase input end is communicated with the direct-current level midpoint of the high-frequency bridge arm modulation module by turning on one group of low-frequency bidirectional switches driven by low-frequency. The high-frequency bridge arm modulation module has two high-frequency bridge arm midpoints, and is used for high-frequency modulation of phase currents of a direct-current positive pole, the direct-current level midpoint and a direct-current negative pole of the high-frequency bridge arm modulation module, and outputs the high-frequency modulated currents through the two high-frequency bridge arm midpoints. By communicating one-phase input end with the direct-current level midpoint of the high-frequency bridge arm modulation module through the low-frequency bidirectional switch, the power conversion can be realized only by using a single-stage high-frequency bridge arm modulation module, and compared with high-frequency modulation of two-stage high-frequency switches, the high-frequency switch loss is effectively reduced, and the power conversion efficiency is improved.

The invention discloses a TDLAS (Tunable Diode Laser Absorption Spectroscopy) analyzer for H2O2 gas, and belongs to the technical field of gas concentration detection. In the H2O2 gas TDLAS analyzer, the inner surface of the gas path system in contact with H2O2 gas is subjected to inert treatment to form a chemical inert layer, so that the gas adsorption loss can be effectively inhibited; the optical path system is arranged in the heat preservation case, a stable physical environment is provided for TDLAS measurement, an instrument is almost not interfered by the field environment, and the long-term drift is extremely small; the laser driving module adopts a composite current source architecture and comprises an operational amplifier serving as an error amplification stage and a push-pull circuit serving as an output stage, so that the stability problem under high-current and high-frequency modulation is fundamentally solved, nearly ideal light source modulation signals are provided for TDLAS detection, and a basis is provided for high-precision harmonic detection. According to the invention, high-performance driving, enhanced protection and precise environment control are deeply coupled, and the precision, stability and reliability of H2O2 gas detection are effectively improved.

The invention relates to the field of fire monitoring and early warning, in particular to a TDLAS-based fire monitoring and early warning method, system and device and a medium. The method comprises the following steps: receiving an external modulation signal and inputting the external modulation signal into a high-frequency modulation circuit to obtain a converted current signal; controlling a laser to emit laser according to the current signal, projecting the laser to a photosensitive surface of a photoelectric detector after the laser passes through gas in a monitoring area, and converting a laser signal by the photoelectric detector to obtain a target digital signal; real-time processing is carried out based on the target digital signal, spectral analysis is carried out based on TDLAS, and the oxygen concentration and the gas temperature are obtained; whether the oxygen concentration and the gas temperature meet preset threshold values or not is judged, and if yes, the change trend of the oxygen concentration and the gas temperature is continuously monitored; and judging whether the change trend meets a preset change trend, and if so, executing an alarm operation. According to the invention, the limitation that the target gas needs to be adjusted for different scenes at present can be effectively avoided, and the universality of fire early warning is improved.

The invention provides a cascade system control method and a cascade system, the cascade system comprises a first inductor and N power modules (N is an integer greater than or equal to 2), each power module is provided with a first side and a second side, a branch formed by connecting the first sides of the N power modules in series bears a first voltage, and the second side of the N power modules bears a second voltage. The second side of each power module is subjected to a second voltage. Each power module includes a switch operating with a switching cycle. And determining the number of the power modules working in the high-frequency modulation mode according to the ratio of the first voltage to the second voltage, so that the moment when the current flowing through the switch is 0 exists in one switching period. The invention provides a soft switching solution, which can reduce the turn-on loss and is favorable for improving the power density of the cascade system. The condition that ZVS cannot be realized when the duty ratio is about 0 or 1 in a carrier cascading modulation means and the condition that ZVS cannot be realized due to ripple cancellation in a carrier phase-shifting modulation means can be avoided.

The invention discloses a wastewater separation and precipitation treatment device and method.The wastewater separation and precipitation treatment device comprises a precipitation tank and a controller, a resonance shell breaking cavity is vertically formed in the center of the interior of the precipitation tank, a vortex ring generation cavity is fixedly in butt joint with a bottom port of the resonance shell breaking cavity, and a vortex ring receiving assembly is fixedly arranged in the center of the bottom port of the vortex ring generation cavity; a cylindrical holographic field lens is integrated in the wall of the resonance shell breaking cavity, and a high-frequency modulation energy field generator is arranged at a top port of the resonance shell breaking cavity; the high-frequency modulation energy field generator is integrated with a phased array feedback system, a micro sensor network is further arranged in the resonance shell breaking cavity, and the micro sensor network is in communication connection with the phased array feedback system. According to the invention, the problem that the traditional physical separation technology cannot efficiently remove micro pollutants with similar density due to the dependence on the density difference of pollutants and water is solved.

The invention discloses a single-phase and three-phase continuous voltage regulation circuit based on series converter chains. The circuit comprises one or three series converter chains, a single-phase or three-phase industrial frequency transformer and a special energy supply connection mode between the series converter chains and the single-phase or three-phase industrial frequency transformer. The series converter chain is composed of N high-frequency modulation converters and n power frequency commutation converters, alternating current output ports of the converters are sequentially connected in series to form a voltage regulating port capable of continuously regulating voltage, and alternating current input ports of the converters are connected with a secondary winding of a power frequency transformer. And an energy supply input port formed by directly leading out the primary winding is connected with the voltage regulating port through a terminal to form a series connection structure. According to the invention, the limitation of step voltage regulation is eliminated fundamentally, continuous and rapid voltage regulation and partial power transmission are realized, the system loss and the device cost are reduced, the reactive power and harmonic compensation capability is realized, the expandability is good, and the system can be flexibly adapted to application scenes of different power levels through series-parallel connection combination.

The invention relates to a high-sensitivity streak camera ultrafast scanning image enhancement and noise reduction method, and belongs to the technical field of ultrafast imaging and signal processing. The method mainly comprises the following steps of: performing spatial modulation on three-dimensional image data coded by a spatial coding element through a periodic grating; carrying out compression imaging on the modulated three-dimensional image data by the streak camera to form a two-dimensional observation image; an ADMM-TV algorithm is adopted to carry out image decoding, and a three-dimensional image containing a periodic modulation structure is recovered; after the three-dimensional image is reconstructed, effective fringe information in the modulated image is further extracted, high-frequency modulation residues are removed, and denoising of the interference fringe image is achieved. Physical separation of signals and noise is achieved through periodic grating modulation, high-frequency interference such as space charge noise can be restrained, the signal-to-noise ratio and contrast ratio of images are improved, and accuracy and stability of diagnosis of an ultrafast imaging system of a VISAR speed interferometer are improved.

This application discloses a visible light positioning and communication method, apparatus, and system, belonging to the field of visible light positioning and communication. It involves driving an LED lamp to emit a light signal with a preset modulation frequency. A receiving sensor receives the spectrum, extracts the chip's native blue light spectrum, and then decodes the spectral information carried by the spectrum based on the hardware parameters of the receiving sensor to obtain digital information. Positioning and communication are then performed based on this digital information. This application's solution completely eliminates physiological flicker perceptible to the human eye by employing high-frequency modulation at a preset frequency. Simultaneously, receiving only the native blue light spectrum effectively removes the afterglow effect of phosphors, ensuring clear high-frequency signals and significantly improving decoding success rate. Adaptive decoding, combined with the receiving sensor's hardware parameters, solves the frequency offset problem caused by hardware differences between different devices, enhancing cross-device compatibility. This achieves high-precision, high-reliability visible light positioning and communication, applicable to indoor navigation, communication, and other scenarios.

The invention provides an in-situ detection method and system for acetylene in oil based on film-coated hollow-core optical fiber enhancement, and relates to the technical field of optical gas sensing. Acetylene molecules are specifically captured and enriched from flowing transformer oil through a selective adsorption film modified on the inner wall of a film-coated hollow-core optical fiber; acetylene molecules are enriched, the local concentration of acetylene molecules detected by a coated hollow-core optical fiber sensing probe is increased by dozens of times, the enriched acetylene molecules are excited by intermediate infrared pumping laser modulated at high frequency, the generated periodic photothermal effect is sensitively detected by near-infrared detection laser transmitted in the same path in a phase change mode, ultrahigh-sensitivity detection can be kept, and the detection accuracy is improved. The system also meets the quick response required by the early warning of a fault, carries out the differential detection when a signal is generated, carries out the temperature compensation, filtering adjustment and frequency adjustment at the same time, and carries out the hierarchical processing of the signal through a four-stage linkage processing mechanism, thereby enabling the whole system to be capable of withstanding a wide temperature range and a strong electromagnetic environment, and also to be capable of achieving the high-precision detection. And time-varying field interference can be resisted in a self-adaptive manner.

The application discloses a video face replacement method and device and a storage medium, relates to the technical field of video face replacement, and comprises the following steps: acquiring an original video to be replaced and an appearance image of a target person, inputting the original video and the appearance image into a preset video face replacement model, and replacing a person in the original video with the target person, wherein the video face replacement model comprises a high-frequency refinement module, the high-frequency refinement module extracts high-frequency latent variables of the appearance image, modulates appearance features of the appearance image based on the high-frequency latent variables, obtains modulated appearance features after high-frequency modulation, and appearance of the target person in the target video is determined based on the modulated appearance features. By modulating the appearance features, the model can better learn high-frequency details in the high-frequency latent variables, so that high-frequency details of the person in the output target video are better depicted, and the realism of the generated face replacement video is improved.

A tunable, modulated high-frequency light beam from a single source of coherent light. An ultra-short pulse of coherent light, having an optical spectrum, is derived from a single source. Spreading the optical spectrum of the ultra-short pulse of coherent light forms a spectrally spread optical pulse which is thereafter split into two or more spectrally spread optical pulses. At least one of the two or more spectrally spread optical pulses is delayed, such that, upon recombining the two or more spectrally spread optical pulses a tunable, modulated spectrally spread optical pulse is formed.

The invention discloses a laser self-mixing interference rotating speed measurement method based on current modulation, and the method comprises the following steps: S1, building a light path, irradiating the laser emitted by a fixed-wavelength solid-state laser to a fixed measurement point of a measured rotating workpiece, and feeding back the light reflected by the workpiece in a diffuse manner into a laser cavity to form self-mixing interference; s2, laser current modulation: inputting a high-frequency sinusoidal modulation current with direct-current bias to the fixed-wavelength solid-state laser, and superposing a high-frequency modulation component in a self-mixing interference signal; s3, interference signal acquisition: a self-mixing interference signal containing a high-frequency modulation component is acquired and converted into a digital electric signal; and S4, signal demodulation and rotation speed calculation: processing the digital electric signal to extract stripe subdivision information, and calculating the instantaneous rotation speed of the workpiece. Compared with the prior art, the laser self-mixing interference rotating speed measuring device based on current modulation and the measuring method thereof have the advantages that high resolution and high signal-to-noise ratio are achieved.

The application relates to a kind of intelligent micro-grid frequency modulation peak shaving and power distribution methods based on photovoltaic power generation, and relates to the field of intelligent micro-grid, comprising: obtaining predicted fluctuation degree and energy supply deviation amplitude by analysis, obtaining fluctuation degree by combining predicted fluctuation degree and historical fluctuation degree, obtaining frequency modulation coefficient and peak shaving distribution coefficient according to fluctuation degree and energy supply deviation amplitude configuration; randomly generate power distribution scheme, according to predicted photovoltaic power generation power sequence and predicted demand load power sequence, carry out peak shaving and frequency modulation analysis, calculate distribution fitness according to frequency modulation coefficient and peak shaving distribution coefficient, carry out iterative optimization evaluation, obtain optimal distribution scheme to carry out power distribution. Through the application, the technical problems that traditional methods cannot efficiently cope with load fluctuation and photovoltaic power generation deficiency, and it is difficult to ensure that energy storage units can respond in time and provide stable and accurate power support, resulting in that micro-grid has large operation fluctuation and high frequency modulation and peak shaving difficulty during high load period can be solved.

This application relates to a differential detection device and method for rubidium isotopes in a single probe of an optically pumped magnetometer, belonging to the field of optically pumped magnetometer technology. The device includes: a laser module, a single atomic gas cell, a magnetic field modulation module, a photoelectric detection module, and a signal processing module. The laser module is used to split a tunable narrow-linewidth laser into two laser beams via a beam splitter, and then combine the two laser beams into a coaxial beam that is incident on the single atomic gas cell. The single atomic gas cell is filled with a mixture of rubidium-85 and rubidium-87 vapor and a buffer gas. The magnetic field modulation module is used to apply a static bias magnetic field and a high-frequency modulated magnetic field to the single atomic gas cell, causing the rubidium isotopes to undergo Zeeman level splitting. The photoelectric detection module is used to collect the light intensity signals corresponding to the two laser beams emitted from the single atomic gas cell. The signal processing module is used to receive the electrical signal converted by the photoelectric detection module, perform differential processing based on the Zeeman resonance signal, and obtain the corrected magnetic field measurement value.

The invention belongs to the field of infrared display in the field of modern equipment manufacturing industry, and particularly relates to a high-temperature stability wide-spectrum infrared light source structure based on an MWCNTAl2O3 heterojunction, the light source structure is characterized in that an Al2O3 film with a nanoscale thickness and an oxygen isolation effect grows on the surface of an MWCNT film based on an atomic layer deposition process, the MWCNTAl2O3 heterojunction is formed, and the high-temperature stability wide-spectrum infrared light source structure based on the MWCNTAl2O3 heterojunction is obtained. And the MWCNTAl2O3 heterojunction is fixed on a PCB (Printed Circuit Board) to obtain the infrared light source. Multiple MWCNTs with high conductivity are used as emitter core materials, and precision manufacturing is carried out in combination with an atomic layer deposition in-situ growth process. According to the technology, accurate regulation and control and efficient packaging of an emitter structure are achieved, finally, the infrared light source capable of being modulated at high frequency is successfully prepared, the modulation frequency of the infrared light source exceeds 30 Hz, the overall size is smaller than 1 cm, power consumption is remarkably reduced to the watt level, and important breakthrough is achieved in the aspects of performance indexes and the integration level.

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

The application discloses an HRR-based acoustic fire type identification method and device, equipment and medium, and relates to the technical field of fire detection, which comprises the following steps: obtaining an original acoustic signal by emitting high-frequency modulated ultrasonic waves and receiving flame area reflected echoes, obtaining channel impulse response data through channel estimation, extracting flame features and calculating a heat release rate curve, and finally completing fire type identification and fire stage determination based on the curve. The method can resist smoke, shielding and light interference, realize accurate quantification of heat release rate, finely identify fire types and determine fire development stages, and provide stable and reliable technical support for fire monitoring and emergency decision-making.

The invention relates to an efficient nerve regulation and control device based on variable modulation high-frequency signals, and the device comprises a stimulation signal output electrode which is used for intermittently outputting stimulation current signals to regulate and control nerves; the high-frequency modulation electric signal generation module is used for generating a composite stimulation current signal formed by combining a high-frequency carrier signal and a low-frequency modulation signal; the power amplification and safety isolation module is used for amplifying the signal output by the high-frequency modulation electric signal generation module and controlling the output voltage within a human body safety voltage range; the signal input end of the power amplification and safety isolation module is connected with the signal output end of the high-frequency modulation electric signal generation module, and the signal output end of the power amplification and safety isolation module is connected with the stimulation signal output electrode. According to the invention, nerve regulation and control can be realized more efficiently.