17 results about "Field frequency" patented technology

The invention relates to the technical field of medical robot systems, and discloses a nerve plexus intelligent positioning anesthesia puncture robot system based on multi-modal fusion, which performs time-space synchronization on ultrasonic image flow and contact force data. The frequency domain analysis module extracts a main peak frequency by using optical flow field frequency domain transformation, and generates a probability mask for marking pulsatile tissues. The viscoelasticity verification module calculates phase lag parameters of visual deformation and contact force, identifies tissue rheological properties and calculates a dynamic damping coefficient. The deformation compensation module calculates a mechanical residual error based on a reference mechanical model, and inversely calculates the mechanical residual error into space deformation displacement of the tissue. The feedback control module combines the probability mask and the deformation displacement to generate a motion instruction. According to the invention, through multi-modal data fusion, precise identification of tiny blood vessels, dynamic identification of tissue attributes and real-time compensation of soft tissue conceding deformation are realized.

The invention discloses a polarization spectrum modulation type multispectral stereo imaging method which solves the problem that in the prior art, an existing polarization spectrum imaging scheme does not achieve three-dimensional reconstruction of a target and achieves the purpose that the three-dimensional reconstruction of the target is not achieved under the condition that active illumination or special marks are not needed. Synchronous high-precision reconstruction of physical attributes and three-dimensional geometry of the surface of the target is realized; the method comprises the following steps: uniformly modulating polarization information and spectral information of incident light of a target through a three-way optical filter and a polaroid to obtain modulated incident light information; performing aliasing acquisition of a plurality of polarization spectrum components on the modulated incident light information through a multi-color detector combination to obtain aliasing light intensity; performing linear solution on the aliasing light intensity to obtain each polarization spectrum component vector, calculating the polarization degree and the polarization angle of each channel, and further deriving a surface zenith angle and an azimuth angle; reconstructing the three-dimensional morphology of each spectrum channel through normal gradient field frequency domain integration; and finally, fusing the multi-spectral three-dimensional data to obtain a multi-spectral three-dimensional imaging result.

The invention discloses a strong dispersion dielectric grating guided mode resonance optical filter insensitive to angles. The filter is based on a strong-dispersion sub-wavelength dielectric grating structure, and the resonant wavelength shows the characteristic of being insensitive to the change of an incident angle. By reducing the thickness of the grating layer and the grating line width, the angle sensitivity of the device can be further reduced. The insensitivity of the wavelength of the device to the angle mainly depends on the intrinsic dispersion characteristic of an excited optical mode in the device, that is, the frequency of the optical mode with strong dispersion changes slowly along with in-plane wave vectors, so that the change of the far-field frequency response along with the angle is obviously slowed down. Based on the principle, an angle-insensitive metasurface device can be designed by using a strong dispersion optical mode. The design method provided by the invention is not only suitable for an optical filter, but also can be popularized to other metasurface devices with strict requirements on angle sensitivity, and has wide application prospects in the fields of optical communication, hyperspectral and multispectral imaging, sensing and the like.

The invention discloses a new energy unit-station level frequency modulation parameter measurement and identification method based on frequency response analysis, and the method comprises the steps: enabling an obtained model to give consideration to the frequency modulation control precision and the adaptability to a plurality of operation conditions through constructing a closed-loop design of offline modeling-online correction-regular updating; a systematic technical path is provided for improving the frequency modulation performance of a new energy station, so that the frequency safety of a novel power system is guaranteed; comprising the following steps: off-line constructing a frequency modulation model of a first-layer unit level of a new energy station through principle analysis; constructing a second-layer station-level frequency modulation coordination control model of the new energy station; establishing a multi-dimensional frequency response deviation quantitative index system; designing a frequency modulation parameter correction optimization model in combination with measurement data of a field frequency test or an online frequency response event to obtain online measurement and discrimination parameters of the new energy unit-field station level frequency modulation model; and a regular updating mechanism is established, and frequency modulation parameters are re-identified and corrected.

The invention relates to the technical field of defect detection, in particular to a full-field optical coherence tomography three-dimensional industrial defect detection system and method suitable for a large-size sample, and interference fringes generated by a full-field interference imaging system illuminate the sample; the three-dimensional displacement platform is controlled to transversely move the sample for multiple times according to a preset track, and the wavelength tunable laser is synchronously controlled to complete wavelength scanning within the exposure time of the area-array camera after each time of movement of the sample is completed; the area-array camera transmits three-dimensional data collected at each position of the sample to the controller; and the controller performs image reconstruction, splicing fusion and rendering display on the three-dimensional original data. According to the method, the full-field OCT technology of surface scanning and the laser frequency sweeping technology are integrated, local three-dimensional structure information of a large-size sample is obtained according to the principle of full-field frequency sweeping OCT, local reconstruction results of adjacent areas are spliced and fused by means of an image splicing algorithm, a complete three-dimensional imaging result is presented, and the three-dimensional imaging precision is improved. Therefore, defects on the upper surface, the lower surface and the interior of the whole large-size sample can be detected.

The utility model discloses an antenna and an electronic device. The antenna comprises a circuit board, a first antenna module and a second antenna module, the first antenna module and the second antenna module are arranged on the circuit board and have different receiving and transmitting frequencies, the first antenna module comprises first radiators and first isolators which are arranged at intervals, and the second antenna module comprises second radiators and second isolators which are arranged at intervals. The first isolator and the second isolator are oppositely arranged, and the first isolator and the second isolator are arranged between the first radiator and the second radiator; the current passing length of the first isolator is matched with the signal receiving and transmitting frequency of the first radiator, the current passing length of the second isolator is matched with the signal receiving and transmitting frequency of the second radiator, and the current passing length is inversely proportional to the frequency. According to the antenna provided by the utility model, the antenna modules are provided with the radiators and the isolators corresponding to the receiving and transmitting frequencies of the radiators, so that the current direction and the radiation field frequency can be adjusted, and the isolation between different antenna modules can be improved.

The utility model discloses an embedded loop type RFID tag, and relates to the technical field of RFID tags. Comprising an antenna and a chip, and the chip is connected above the antenna through a conductive adhesive; the antenna is in a sheet shape, an opening is formed in the middle of the antenna, a connecting arm is arranged in the opening, a binding area is arranged in the middle of the connecting arm, and the binding area is used for being connected with a chip; a loop loop area is formed in the opening and located on the inner side of the connecting arm, and a radiation area is formed on the antenna and located on the outer side of the loop loop area. According to the utility model, during working, the tag antenna innovatively adopts a loop loop area embedded antenna design and a loop loop area overall embedded design, and the loop loop area is provided with different embedded depths, so that the far and near field frequency point adjustment and performance optimization of the tag can be realized.

The invention discloses an electromagnetic scattering characteristic modeling method based on generalized characteristic current optimization, and the method comprises the steps: constructing an equivalent closed curved surface which surrounds a scatterer, and setting the frequency of an electromagnetic scattering field to be calculated; performing triangular mesh generation on the equivalent closed curved surface, establishing a corresponding RWG primary function, and determining an impedance matrix corresponding to the frequency of the electromagnetic scattering field; calculating a propagation matrix from the RWG primary function to the far-field spherical surface; based on the impedance matrix and the propagation matrix, constructing a generalized characteristic equation and solving a corresponding generalized characteristic current and a generalized characteristic propagation matrix; setting a measurement point outside the equivalent closed curved surface, applying a plane wave based on the set electromagnetic scattered field frequency and incident angle in the microwave anechoic chamber environment, and determining scattered field measurement data at the measurement point; constructing a convex optimization model to optimize the generalized characteristic current coefficient, and obtaining the surface induction current of the scatterer under the irradiation of the plane wave; and determining a scattered field at any position of the space based on the surface induction current.

A method for starting an EC motor having a stator and a rotor, comprising the steps of determining a first position of the rotor when the rotor is stationary by means of discrete signal injection, accelerating the rotor by means of a controlled rotating field, determining a speed of the rotor on the basis of a back EMF after reaching a predetermined rotating field frequency, comparing the speed determined, with a first predetermined speed value, and, if the speed determined is greater than the first predetermined speed value, determining a second position of the rotor on the basis of the back EMF and changing to a closed-loop operation on the basis of the back EMF.

The invention discloses display equipment integrating 40Hz acousto-optic stimulation and air disinfection and a control method. The equipment comprises a display panel, a main controller, a field frequency switching processing module, a display lamp processing module, an ultraviolet air disinfection module, a fan MCU processing module and a 40Hz sound correction processing module. The field frequency of the display panel is switched to a fixed 40Hz mode, and the rotating speed of the fan is controlled to generate stable 40Hz sound waves, so that acousto-optic physiotherapy stimulation on the Alzheimer's disease patient is realized; and meanwhile, the ultraviolet air disinfection module sterilizes and disinfects air blown by the built-in fan, so that the environmental sanitation is improved. The control method includes adjusting the fan PWM output through sound feedback to stabilize the audio frequency, and the user can select the display mode, the brightness and the color temperature. The system is high in integration level, has treatment assistance and disinfection functions, and is high in practicability.

The invention discloses an information system operation risk early warning method, system and device, and particularly relates to the technical field of operation safety and risk early warning, and the method comprises the following steps: collecting user data to generate an operation log correlation index; generating a data transmission integrity coefficient based on the operation log correlation index; generating a multi-source data correlation matrix based on the integrity coefficient; generating a multi-dimensional abnormal association degree threshold value based on the multi-source data association degree matrix; and generating an operation and maintenance risk early warning level and a disposal suggestion based on the multi-dimensional abnormal association degree threshold. Through multi-link data processing, multi-technology fusion and multi-dimensional analysis, the operation risk early warning efficiency of the information system is improved, user operation behavior data is collected, cleaned and screened, the field frequency is counted in combination with the standard log template and the precise time window, the operation log correlation index accuracy is improved, and the operation efficiency is improved. And a reliable data foundation is laid for subsequent analysis.

A method of starting an EC motor comprising a stator and a rotor, comprising the steps of: a) determining a first position of the rotor when the rotor is at rest (101) by discrete signal injection; b) achieving acceleration of the rotor (103) by a controlled rotating field; c) determining a rotational speed of the rotor based on a back electromotive force after a predetermined rotating field frequency is reached in step b) (105); d) comparing the rotational speed determined in step c) to a first predetermined rotational speed value (107); and e) if the rotational speed determined in step c) is greater than the first predetermined rotational speed value: determining a second position of the rotor based on the back electromotive force, and switching to a closed loop operating mode based on the back electromotive force (109).

The invention provides a video time sequence generation method and device, electronic equipment and a storage medium, and belongs to the technical field of data processing. The method is applied to a main control chip of the display equipment, and comprises the following steps: in response to a received video signal which comprises video data and a video time sequence, judging whether a cache region corresponding to the video data meets a preset condition or not; determining a target value of a vertical total row number according to an input field frequency corresponding to a video time sequence and a display parameter of a display device under the condition that the cache region meets a preset condition, and generating a target row synchronization signal corresponding to a field synchronization signal in the video time sequence according to the target value; and generating a target video time sequence according to the target line synchronization signal and the field synchronization signal, wherein the target video time sequence is used for displaying a video picture by the display device. According to the embodiment of the invention, the compatibility of the main control chip to the display equipment can be improved under the condition that the cache resources of the video data are limited.

This invention discloses a method, system, and device for early warning of operational risks in information systems, specifically relating to the field of operational security and risk early warning technology. The method includes the following steps: collecting user data to generate an operation log correlation index; generating a data transmission integrity coefficient based on the operation log correlation index; generating a multi-source data correlation matrix based on the integrity coefficient; generating a multi-dimensional abnormal correlation threshold based on the multi-source data correlation matrix; and generating an operational risk warning level and handling suggestions based on the multi-dimensional abnormal correlation threshold. This invention improves the effectiveness of early warning for operational risks in information systems through multi-stage data processing, multi-technology integration, and multi-dimensional analysis. It collects and cleans user operation behavior data, combines a baseline log template with precise time windows to statistically analyze field frequencies, and improves the accuracy of the operation log correlation index, laying a reliable data foundation for subsequent analysis.

The invention belongs to the technical field of optical channel monitoring, and particularly discloses an optical channel real-time monitoring method and device for a wavelength division multiplexing system. Comprising the following steps: carrying out dispersion stretching and broadening on an ultra-short optical pulse to form a stable time-domain spectrum matched with the bandwidth of a signal to be detected; applying the dispersion amount the same as that of the ultrashort pulse to a wavelength division multiplexing signal to be measured to realize dispersion matching of the two; taking the dispersed ultrashort pulse as local oscillator light, taking the dispersed to-be-measured signal as an input signal, and converting an optical signal into two paths of orthogonal IQ electric signals through coherent receiving; performing high-speed acquisition on the electric signal by using a real-time acquisition card, and performing time-frequency mapping to obtain a full-field frequency spectrum with a time domain secondary phase; a digital signal processing algorithm is combined with a calibration and calibration process, and a complete vector spectrum of an original signal is accurately recovered. According to the invention, no extra signal interference and high-precision real-time synchronous monitoring of core parameters such as optical signal-to-noise ratio, dispersion and nonlinear effect of all independent optical channels of the wavelength division multiplexing system can be realized.

The invention discloses a method for determining transmit-receive distance based on detection depth of a controllable source audio magnetotelluric method, and the method comprises the steps: carrying out the simulation calculation of an electromagnetic field of a uniform geodetic model through employing a fast Hankel transformation method, mainly calculating the Cannius apparent resistivity and impedance phase under the conditions of different transmit-receive distances and different geodetic resistivity; determining the lowest far-field frequency, and concluding a formula for calculating the lowest far-field frequency by using a field source condition; and a detection depth calculation formula is further deduced according to the formula. Verifying the correctness of the calculation formula of the lowest far-field frequency and the calculation formula of the detection depth by using a field test mode, determining the lowest far-field frequency of the actually measured data and the corresponding apparent resistivity, calculating the actually measured detection depth, and comparing the actually measured detection depth with a theoretical value calculated by using a formula derived by induction; in order to conveniently judge the lowest far-field frequency in the CSAMT data, AMT data is also collected for comparison.

The application discloses a kind of turbulent flow adaptive steel casing intelligent leveling hoisting multi-modal control method and system, the method includes: in steel casing hoisting operation area, multiple-source sensor is laid out, and the original signal of each sensor is collected in real time, the observation of each sensor is obtained by normalizing the original signal, according to the preset multi-modal perception fusion function, the observation of each sensor is fused into fusion perception field;The corresponding frequency domain field is obtained by Fourier transform to fusion perception field, and the probability of frequency domain field frequency energy in each spectral energy box is calculated to calculate local spectral entropy, according to frequency domain field and local spectral entropy, turbulent flow adaptive frequency spectrum is calculated;The current attitude error vector of steel casing is mapped to by mapping operator through turbulent flow adaptive frequency spectrum, and according to target leveling attitude vector, tracking weight matrix and energy consumption balance penalty term, control vector is solved, and leveling instruction of each lifting point is generated by anti-normalization to control vector.