500 results about "Ultra high frequency" patented technology

The invention provides an assembly line electronic tag management system based on multi-frequency fusion, and relates to the technical field of the Internet of Things, and the system comprises a dual-band module which is used for integrating a high-frequency and ultrahigh-frequency dual-band radio frequency electronic tag on the surface of a target object, and forming a tag dual-mode function; and the signal processing module is used for synchronously acquiring the high-frequency positioning signal and the ultrahigh-frequency identification signal through the multi-band reader-writer array on the basis of a tag bimodal function so as to obtain a preprocessed signal flow with aligned time domains. According to the invention, the efficiency of label identification, data transmission and production management is improved in a complex scene, errors and cost are reduced, and efficiency and quality are improved.

The invention relates to a micro-grid frequency control system with hybrid energy storage. The system comprises an input power decomposition module for performing adaptive wavelet packet decomposition on wind power generation output power to obtain an optimal low-frequency component and an optimal high-frequency component; the initial power distribution module is used for decomposing the high-frequency component into a sub-high-frequency component and an ultrahigh-frequency component and respectively distributing the sub-high-frequency component and the ultrahigh-frequency component to a storage battery and a super capacitor to obtain a primary power distribution instruction; the correction power distribution module is used for correcting the primary power distribution instruction through a Logistic regression function to obtain an optimized output instruction; and the power grid primary frequency modulation module inputs the frequency deviation and the frequency change rate of the micro-grid into a hybrid energy storage model based on virtual inertia control and virtual droop control to obtain a total frequency modulation output demand and generate a total frequency modulation output instruction. According to the system, through the adaptive wavelet packet decomposition and hybrid energy storage technology and in combination with virtual inertia and virtual droop control, the fluctuation of the distributed power supply can be effectively stabilized, and the frequency stability of the micro-grid is improved.

The invention relates to a method for activating a function of a motor vehicle by means of an activation device comprising at least four ultra-wide-band communication external antenna modules and an ultra-high-frequency communication module, from an item of “hands-free” portable access equipment (SD) carried by a user, comprising an accelerometer, a gyroscope and a magnetometer, the activation of the function being triggered by detection of the presence of the user in a predetermined zone around the vehicle, and depending on an authentication result, the method comprising the following steps:s) determining an initial position of the item of access equipment with respect to the vehicle,t) measuring the values from the gyroscope, from the magnetometer and from the accelerometer,u) obtaining a value of the probability of the intention to activate a vehicle function,v) comparing the probability value with at least one predetermined threshold,w) transmitting, at ultra-high frequency from said item of equipment to said vehicle, a request to place the external antenna modules in partial or full ultra-wide-band communication operation, depending on the result of said comparison,x) activating the vehicle function, depending on an estimate of the distance between said item of equipment and the vehicle made by said external antenna modules thus activated in the ultra-wide band.

The invention discloses a millimeter wave signal phase noise testing method based on ultra-stable laser, and the method comprises the steps: generating the ultra-stable laser through employing a common-cavity Brillouin laser frequency stabilization technology, taking the ultra-stable laser as a carrier wave, and carrying out the double-sideband modulation of a to-be-tested millimeter wave signal; frequency shifts of the two sidebands are different, the sideband with high frequency has more downward frequency shifts, the sideband with low frequency has less downward frequency shifts, the generated common-cavity Brillouin laser and the double-optical-sideband pumping laser are coupled and separated to obtain upper and lower double-sideband optical signals with different frequency intervals, and then beat frequency and mixing frequency are performed to generate an intermediate frequency signal with MHz magnitude; the noise characteristic of the intermediate frequency signal directly carries the phase noise of the to-be-tested signal, and the phase noise analyzer carries out noise spectrum density analysis and quantitative evaluation on the intermediate frequency signal to complete the phase noise test of the to-be-tested millimeter wave signal. The collaborative optimization problem that the reference source stability, the system noise and the to-be-tested signal noise are difficult to separate in the ultrahigh frequency signal noise test is solved.

The invention discloses a method and a device for processing VHF (very high frequency) and UHF (ultra high frequency) navigation signals based on ZYNQ, and relates to the technical field of signal processing, and the method and the device are characterized in that a single ZYNQ chip is used for replacing an FPGA (field programmable gate array) + DSP (digital signal processor) dual-chip framework of a digital processing part of a traditional aviation navigation signal receiver, so that the system integration level is increased, the design is more compact, the circuit design is simpler, and the system reliability is improved. Lightweight design of airborne equipment is facilitated; besides, by means of the strong processing performance of the PL part of the ZYNQ chip and the high-speed analog-to-digital conversion chip (ADC) which develops rapidly, receiving of VHF and UHF navigation signals can be achieved through the radio frequency direct sampling technology, complete digitization of analog down-conversion is achieved, and the advantages are that the problems of leakage and frequency offset of an analog local oscillator and generation of more harmonic waves and stray can be solved. And the electromagnetic interference of equipment is obviously reduced.

The invention discloses a power system partial discharge ultra-wideband detection device based on an MEMS atomic gas chamber, and the device comprises a detection laser used for emitting detection light, a coupling light laser used for emitting coupling light, and an MEMS atomic gas chamber used for transmitting the detection light and the coupling light to the MEMS atomic gas chamber, the modulation transmission module is used for controlling the MEMS atomic gas chamber to move in discharge equipment by utilizing a four-axis transmission system, acquiring an electric signal acquired by a photoelectric detector arranged at one end of the MEMS atomic gas chamber, converting the electric signal into a spectral signal, and transmitting the spectral signal to the MEMS atomic gas chamber. And the data processing module is used for receiving the spectrum signal, analyzing the spectrum signal and determining a discharge position according to an analysis result. According to the invention, the micro atomic gas chamber manufactured by using the MEMS technology is combined with the specific wavelength laser excitation and detection technology, so that the accurate detection and analysis of ultrahigh frequency and ultra wide band electromagnetic signals generated by partial discharge are realized.

The invention discloses a frequency adjustment control method and device for an ultrahigh frequency wafer, and relates to the technical field of semiconductor production. Determining a target area of the coated wafer, dividing the target area to obtain a plurality of to-be-detected areas, and obtaining the area vibration frequency of the to-be-detected areas; if the area vibration frequency is larger than a preset frequency threshold value, the area to be detected is judged to be an abnormal area, a feature code is added, and the area vibration frequency and the feature code are uploaded to a feature database; working parameters of the laser etching equipment are determined according to the feature database, and the abnormal area is etched according to the working parameters; the vibration frequency of each to-be-detected area is detected, the area with the abnormal vibration frequency is identified, a feature code is added to the area, the area vibration frequency and the feature code are uploaded to a feature database, rapid identification and intelligent marking of the abnormal area are achieved, and data support is provided for subsequent laser etching equipment working parameter optimization. And the accuracy and the high efficiency of the etching operation are ensured.

According to the ring main unit with the intelligent online partial discharge detection system provided by the invention, the problem of multisource data asynchronization is solved through a four-dimensional space-time synchronous acquisition mechanism, so that the time alignment error of ultrahigh frequency and ultrasonic signals is lower, and the positioning precision is higher; the edge computing unit is used for executing adaptive filtering and pulse extraction, so that the effective data compression rate is greatly increased, the bandwidth requirement is reduced, and quick response within 3 seconds is realized; cross-modal coupling factor quantification electromagnetic-acoustic emission correlation characteristics are innovatively proposed, the contribution degree of a sensor is adaptively adjusted in combination with a dynamic weight distribution strategy, and high discharge type recognition accuracy is still kept in a strong electromagnetic interference environment; the space-time heterogeneous data is cooperatively processed through the two-channel deep learning model, the composite discharge mode is effectively identified, and the false alarm rate is lower compared with a traditional method; in addition, the system automatically and incrementally trains the model per week, continuously adapts to signal attenuation caused by equipment aging, and prolongs the effective monitoring life by more than three times.

The invention relates to the technical field of target detection and identification, and discloses a low-altitude target identification system and method combined with multi-band signal processing. Comprising the steps of establishing a cross-frequency implicit vector model and constraining a geometric scale, a scattering center and rotor harmonic waves through synchronous acquisition of an L-band radar, a Ku-band radar and a millimeter-wave radar, and realizing unified characterization of multi-frequency signals; receiving a global satellite navigation system reflection signal, communication channel state information or a very high frequency / ultrahigh frequency passive radar signal to form prior discrimination, and triggering high-frequency radar short-time imaging; carrying out propagation correction on millimeter wave, terahertz and infrared signals in combination with a meteorological profile and generating an environment label; determining a sampling window by using the region of interest and rotor phase prediction, and optimizing a residence strategy; harmonic waves are extracted from radar and acoustic signals, robust pairing is carried out, and a cross-domain consistency score output category is calculated. The method realizes multi-frequency multi-source cooperative processing, has environment self-adaption and closed-loop feedback capabilities, and can improve the precision and stability of low-altitude target identification.

The invention relates to the technical field of cable fault detection, in particular to an insulation fault detection method, system and device for a flexible signal cable, and the method comprises the steps: obtaining the electromagnetic wave intensity of each position at different sampling moments in the working process of the flexible signal cable, extracting the local pulse segment of each high-frequency sequence, and obtaining the local pulse segment of each high-frequency sequence; constructing a pulse steep coefficient of each local pulse segment by combining the change degree of the electromagnetic wave intensity in each local pulse segment and the pulse duration; and analyzing the frequency range and the phase difference of the electromagnetic wave intensity in the frequency domain, and constructing the partial discharge frequency coefficient of each ultrahigh frequency sensor by combining the amplitude average level and the phase fluctuation, thereby obtaining the partial discharge characterization value of each ultrahigh frequency sensor so as to detect the insulation fault of the flexible signal cable. According to the invention, the influence of electromagnetic interference on insulation fault detection can be reduced, and the accuracy of insulation fault detection of the flexible signal cable is improved.

The invention discloses a transformer partial discharge mode identification method and system based on multi-source data fusion, and relates to the technical field of transformer maintenance, the transformer partial discharge mode identification system comprises an identification execution module, a multi-source data fusion module and a discharge identification module, the identification execution module is used for collecting ultrahigh frequency electromagnetic wave, ultrasonic wave and high frequency pulse current partial discharge signals; and the multi-source data fusion module is used for carrying out unified time reference and intensity normalization processing on a detection period and a sampling resolution ratio, carrying out dynamic adjustment on two output parameter characteristics according to a subsequent detection result, carrying out multi-source data fusion processing, and carrying out multi-source data fusion processing on the two output parameter characteristics. The discharge identification module is used for comprehensively judging a partial discharge mode according to the processed data, and the identification execution module comprises a UHF detection unit, an AE detection unit, an HFCT detection unit, a gas component detection unit and an ultrahigh frequency electromagnetic wave analysis module.

The invention relates to the technical field of GIS partial discharge high-precision three-dimensional positioning, and discloses a multi-stage iteration GIS partial discharge high-precision three-dimensional positioning method, and the technical scheme is characterized in that S1, an electromagnetic simulation model is constructed based on a GIS equipment structure, and the installation position of an ultrahigh frequency sensor is optimized through electromagnetic simulation; s2, performing wide-band adaptive sub-band reconstruction and multi-resolution feature enhancement processing on the acquired signals; s3, calculating three-dimensional focusing energy distribution by adopting a multi-band time inversion method, and extracting candidate discharge positions; s4, screening candidate positions; s5, performing multi-stage hybrid optimization on the screening result to obtain refined three-dimensional positioning coordinates; and S6, outputting a three-dimensional positioning result, and performing performance evaluation based on a confidence index. According to the method, a time delay consistency screening mechanism is introduced, false candidate points which do not conform to an actual signal propagation rule are effectively eliminated, and the accuracy and reliability of a positioning result are remarkably improved.

The utility model discloses an earphone with a coaxial frequency division loudspeaker, which relates to the technical field of earphones and comprises an earphone outer shell, a hollow carrying frame is fixed at the upper end of the inner side of the earphone outer shell, and an annular piezoelectric ceramic loudspeaker used for expressing medium-high frequency is arranged on the inner side of the hollow carrying frame. A large moving coil loudspeaker used for showing low and medium frequencies is arranged on the inner side of the earphone outer shell and located at the lower end of the hollowed-out carrying frame, a flat loudspeaker used for showing high frequencies is arranged on the upper end of the hollowed-out carrying frame and located on the inner side of the annular piezoelectric ceramic loudspeaker, and a circular piezoelectric ceramic loudspeaker used for showing ultrahigh frequencies is arranged at the upper end of the flat loudspeaker. According to the earphone with the coaxial frequency division loudspeaker provided by the utility model, the annular piezoelectric ceramic loudspeaker, the large moving coil loudspeaker, the flat panel loudspeaker and the circular piezoelectric ceramic loudspeaker are coaxially arranged, so that the sound performance integrity of the earphone is stronger, the sound depth can be better reflected, and the expressive force of full audio of the earphone is generally improved.

The invention relates to the technical field of new energy automobile motor fault monitoring, and discloses a new energy automobile motor fault monitoring method and system, and the method comprises the steps: obtaining a switch control signal of an inverter of a new energy automobile drive motor, and starting ultra-high frequency sampling in a time window according to the signal, three-phase current and voltage signals of the motor are collected for analysis, transient and high-frequency pulse signals generated by early insulation degradation of the motor can be effectively captured, and the limitation that a traditional monitoring system cannot recognize weak partial discharge due to insufficient sampling frequency or overlapping with background noise is overcome. By comparing an analysis result with an ideal waveform, transient abnormal characteristics of early insulation degradation can be accurately extracted, and normal transient interference is prevented from being misjudged as a fault.

The invention belongs to the technical field of circuit breaker discharge monitoring, and particularly relates to a circuit breaker partial discharge monitoring system which comprises a sensing acquisition module, a data acquisition and preprocessing module, a signal identification and diagnosis module, an alarm and decision module, a communication and visualization module and a system management and storage module. According to the circuit breaker partial discharge monitoring system provided by the invention, the high-frequency current sensor, the ultrasonic sensor, the ultrahigh-frequency electromagnetic wave sensor and the environmental parameter sensor are integrated, so that multi-dimensional detection of electric, magnetic and acoustic signals generated in a partial discharge process and an interference environment is realized, and the signal credibility and the recognition precision are effectively improved; and the problems of false alarm and missing alarm of a single sensor are avoided.

The present disclosure provides a method, apparatus and system for monitoring ultra-high frequency partial discharge of a hydro-generator, and belongs to the technical field of hydro-generator partial discharge monitoring. The method includes: cleaning a partial discharge pulse sequence using a cleaning threshold to obtain a valid pulse sequence; performing redundant data filtering on each data unit divided from the valid pulse sequence to obtain a first target pulse sequence for short-period partial discharge monitoring; determining sub-sequences that are partial discharge events from the valid pulse sequence, forming a second target pulse sequence after associating an amplitude statistical feature of the sub-sequences, and storing the second target pulse sequence. The aforementioned method combines data cleaning, redundant data filtering, and partial discharge event identification, which enhances the real-time performance of partial discharge monitoring and records the long-period partial discharge change trend. The corresponding system adopts a multi-buffer zone and multi-processor architecture, thus further improving the real-time performance of partial discharge monitoring.

The invention relates to the technical field of book borrowing, and particularly discloses a control method and system of a multi-channel ultrahigh frequency non-inductive borrowing channel, the control method and system are applied to a multi-channel control box body comprising a plurality of channels, and the method comprises the following steps: obtaining a historical book borrowing table of a borrower in each channel; obtaining label information of all books in each channel, and obtaining label time slot return information according to the label information; obtaining time slot position information of each piece of label time slot return information, and judging whether the time slot position information corresponding to each piece of label time slot return information is located at the same position or not; according to the method, efficient book management and borrowing verification are realized, and various problems such as label conflicts, incomplete detection and disordered data management in a traditional method are solved.

The invention discloses a piece placing sequence mistake proofing device which comprises a multi-dimensional sensing module, an intelligent control module, a reconfigurable positioning module, an execution intervention module, a block chain tracing module and a man-machine interaction module, and all the modules communicate through an industrial Ethernet. The multi-dimensional sensing module and the intelligent control module adopt a time-sensitive network protocol to guarantee the certainty of data transmission, the multi-dimensional sensing module integrates an AI vision assembly, an ultrahigh frequency radio frequency identification read-write unit and a polarized light detection assembly, and parallel acquisition and cross validation of cutting piece multi-dimensional information are realized through a time sequence synchronous triggering mechanism. According to the method, a full-dimensional recognition system can be constructed through cooperation of multi-modal sensing fusion and an intelligent algorithm to avoid a single detection blind area, multi-variety production requirements are adapted by relying on AI incremental learning and rapid remodeling design, non-tampering tracing of quality data is realized in combination with a block chain technology, and the method is suitable for mass production. And meanwhile, reliable operation of the system is guaranteed through redundancy control and emergency design.

The invention relates to the technical field of cables, in particular to an ultrahigh-frequency low-loss longitudinal-hole PTFE insulated coaxial cable which comprises a composite conductive bar, a silver-plated copper flat belt, a PTFE insulating layer, a corrugated aluminum belt shielding layer and a sheath layer which are sequentially connected in a sleeved mode from inside to outside. Four identical longitudinal holes are formed in the PTFE insulating layer, and each longitudinal hole penetrates through the PTFE insulating layer along the extension direction of the PTFE insulating layer; each longitudinal hole is in a crescent shape; the longitudinal holes are distributed at equal intervals in the circumferential direction of the PTFE insulating layer; and each longitudinal hole is formed in the edge area, close to the outer ring, of the PTFE insulating layer. According to the cable, the transmission efficiency is improved by reducing signal attenuation, the service life is prolonged by improving the temperature resistance level, the inner conductor and the outer conductor are structurally adjusted to ensure that the cable has certain flexibility, and energy conservation and environmental protection are achieved by reducing the use amount of rare metal.

The invention discloses an ultrahigh frequency RFID reader-writer digital processing circuit based on RISC-V. The ultrahigh frequency RFID reader-writer digital processing circuit can be applied to the technical field of radio frequency. According to the application, the processing module, the memory module and the ultrahigh frequency read-write data module are arranged, the controller core constructed based on the RISC-V architecture is arranged in the processing module, and then the processing module, the memory module and the ultrahigh frequency read-write data module are tightly coupled, so that the integration level of the reader-writer can be effectively improved; the area of the reader-writer is reduced, then the interaction process of the ultrahigh-frequency read-write data module and the controller core is managed in a coordinated mode through the bus matrix, and after the controller core receives an external control instruction sent by an upper computer, the label data reading process of the ultrahigh-frequency read-write data module is controlled according to the external control instruction. Therefore, the characteristics of the RISC-V architecture can be utilized, the manufacturing cost is reduced, and the area of the reader-writer is further reduced.

1. Name of the Design Product: Ultra High Frequency Radio Frequency Antenna (AZ-SUR71). 2. Use of the Design Product: Antenna for radio frequency identification device. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photograph that Best Indicates the Design Key Points: Front view. 5. This design product is a thin product, so the left view is omitted; this design product is a thin product, so the right view is omitted; this design product is a thin product, so the top view is omitted; this design product is a thin product, so the bottom view is omitted.

The invention discloses a three-dimensional visual transformer substation equipment local abnormal discharge positioning method and a three-dimensional visual transformer substation equipment local abnormal discharge positioning system, and relates to the technical field of discharge positioning. Performing Hanning window processing and discrete Fourier transform to obtain a power spectrum, defining a working band, calculating a power spectrum mean value and a cross-channel spectrum value to determine a free spectrum interval, and generating a comb line center set; calculating a parasitic leakage index, and dividing the broadband energy by the index to obtain equalized broadband energy; based on this, a partial discharge space coordinate is calculated by combining sensor installation parameters, and finally, a device three-dimensional model is associated to realize three-dimensional visualization of a positioning result; according to the scheme, the interference of parasitic resonance on positioning is eliminated, the comparability of amplitude and distance attenuation is recovered, the positioning accuracy is improved, three-dimensional visualization is convenient for operation and maintenance personnel to quickly identify a discharge part, and the safe operation of substation equipment is ensured.

The invention provides an oil-filled sleeve monitoring sensor. The oil-filled sleeve monitoring sensor comprises an aluminum alloy shell, a Teflon hollowed-out shell and a stainless steel shell arranged between the aluminum alloy shell and the Teflon hollowed-out shell. A pressure sensor, a hydrogen sensor, a UHF (Ultra High Frequency) sensor and a PCB (Printed Circuit Board) are arranged in the Teflon hollow shell; and the PCB is respectively connected with the pressure sensor, the hydrogen sensor and the UHF sensor. The sensors mounted on the circuit board are integrated together in a welding manner, so that the use space of the sensors is reduced, the sensors are more miniaturized and integrated, the future maintenance is greatly facilitated, and meanwhile, the shell for protecting the circuit board for mounting the sensors adopts a Teflon hollow structure, so that the sensor is corrosion-resistant, high-temperature-resistant and high-temperature-resistant, and the service life of the sensor is prolonged. And electromagnetic shielding of a metal material to the electromagnetic wave sensor can be avoided.

The invention relates to a display method, a display device and a storage medium. The display method comprises the steps of determining current display brightness of a display screen of the electronic equipment; in response to the fact that the current display brightness is smaller than a first brightness threshold value and smaller than a second brightness threshold value, the first frequency is determined as the target dimming frequency, and the first frequency is higher than a preset frequency threshold value; and setting a current dimming frequency according to the target dimming frequency, and performing screen dimming on the display screen by using a pulse width modulation (PWM) dimming mode according to the current dimming frequency. According to the invention, in the display brightness interval corresponding to PWM dimming, the interval is divided into two brightness ranges according to the preset brightness threshold value, dimming is carried out on the display screen by adopting the dimming frequency higher than the preset frequency in the PWM dimming mode in the relatively low brightness range, and the brightness of the display screen is adjusted on the premise of ensuring the endurance of the electronic equipment. Ultrahigh-frequency PWM dimming under low display brightness is achieved, the problem of low-brightness flicker is effectively solved, and display and eye protection are achieved.

The present application relates to an ultra-high frequency flexible anti-metal interference electronic tag, which belongs to the field of electronic tag technology, and includes a flexible substrate, a main antenna, a matching circuit, an RFID chip, a parasitic antenna, a variable capacitance diode, a coupling strength detection circuit, and a capacitance control circuit. The main antenna is arranged on a flexible substrate; the matching circuit is connected between the main antenna and the RFID chip; the two parasitic antennas are respectively located on both sides of the main antenna, and the closed ends of the parasitic antennas are connected through variable capacitance diodes; the coupling strength detection circuit is used to detect the coupling strength between the main antenna and the parasitic antenna, and output a control signal; the capacitance control circuit adjusts the capacitance of the variable capacitance diode according to the control signal. The present application improves the anti-interference performance of the electronic tag in a metal environment.

The invention relates to an ultrahigh frequency RFID-based bus electronic stop board guide system and a guide method thereof, and the method comprises the steps: firstly, deploying an ultrahigh frequency RFID radio frequency unit at a bus electronic stop board end to recognize the identity of a bus waiting passenger at a stop in a real-time and non-contact manner, and determining the individual passenger and the potential or clear bus taking demands of the passenger; the real-time bus information of a line concerned by a passenger is directly pushed to the passenger or is preferentially and highlighted on a stop board, so that the time for the passenger to acquire the required information is greatly shortened, and the accuracy and efficiency of information acquisition are improved; secondly, through real-time statistics and analysis of the number of specific waiting passengers waiting for different routes on the station, the system can dynamically adjust the display priority, frequency and duration of information of each route according to the current actual demand, so that information display is more focused on the instant demand of the passengers, the utilization efficiency of the stop board screen resource is optimized, and the user experience is improved. And the interference of invalid information is reduced.

A radio frequency identification (RFID) switch tag is disclosed. This RFID switch tag includes a base component having an ultra-high frequency (UHF) booster, and a detachable component having at least one UHF RFID module and a high frequency (HF) RFID module. In some embodiments, the detachable component is positioned in close proximity to the base component in a first configuration of the RFID switch tag such that the at least one UHF RFID module is sufficiently coupled to the UHF booster in the base component to form an UHF RFID system having a desired performance. The detachable component can also be separated from the base component to obtain a second configuration of the RFID switch tag, and the HF RFID module remains functional within the detached detachable component so that the detachable component can be used as a standalone HF RFID tag.

A battery fire prevention and diagnosis system in accordance with the present invention comprises: an ultra-high frequency (UHF) sensor for measuring radiated electromagnetic wave installed inside or outside a battery system; a data acquiring unit for receiving the radiated electromagnetic wave signals measured from the UHF sensor; noise / defect cause database including on-site noise data related to a site in operation, and data on causes of defects; and a diagnosis unit for determining abnormality of the battery system, and a cause of a defect based on the radiated electromagnetic wave signal data acquired from the data acquiring unit, and the on-site noise data and the data on causes of defects in the noise / defect cause database.

Techniques for improving acoustic wave device structures are disclosed, including filters, oscillators and systems that may include such devices. First and second layers of piezoelectric material may be acoustically coupled with one another to have a piezoelectrically excitable resonance mode. The first layer of piezoelectric material may have a first piezoelectric axis orientation, and the second layer of piezoelectric material may have a second piezoelectric axis orientation that substantially opposes the first piezoelectric axis orientation of the first layer of piezoelectric material. The first and second layers of piezoelectric material have respective thicknesses so that the acoustic wave device has a resonant frequency that is in a super high frequency band or an extremely high frequency band.

The present invention comprises: a memory for storing phase-resolved partial discharge (PRPD) datasets of a gas-insulated switchgear received from an ultra-high frequency (UHF) sensor; and a processor for generating a defect detection model by using the stored PRPD datasets. To detect a partial discharge defect in a gas-insulated switchgear with high accuracy even with a small amount of training data, the processor generates a defect detection model by performing supervised contrastive learning on the basis of pre-collected PRPD datasets, and determines the type of partial discharge defect upon receiving an input of the PRPD data.