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244 results about "High frequency transducer" patented technology

A high operating frequency, in turn, means the high frequency transducer can be smaller. On the other hand, for a given distance, signal damping increases significantly as the signal frequency increases. The maximum range can be increased, and small objects can be detected more easily, by narrowing the signal beam.

Microstrip Antenna And High Frequency Sensor Using Microstrip Antenna

A microstrip antenna has feed element 102 and parasitic elements 104, 106 on the front surface of substrate 1. Microwave electrical power is applied to feed element 102. Parasitic elements 104, 106 are connected via through hole type leads passing through substrate 1, to switches upon the rear surface of substrate 1, respectively. By actuating the switches individually, parasitic elements 104, 106 are individually switched between a grounded state and a float state. The direction of the radio beam emitted from the microstrip antenna is varied by selecting which of parasitic elements 104, 106 is grounded and floated. A microwave signal source connects to feed element 102 via an feed line 108 very much shorter than the wavelength, accordingly the transmission losses being low and the efficiency being excellent.
Owner:TOTO LTD

Multifunctional Residential Circuit Breaker

An electrical fault detection device for use in a branch of a power circuit that utilizes signals from an AC line current sensor coupled to an electrical distribution line having a primary and neutral lines, a line high-frequency sensor coupled to the electrical distribution line, a differential current sensor coupled to the primary and neutral lines, and a ground fault current sensor coupled to the primary and neutral lines. A signal conditioner receives the signals outputted by AC current line current sensor, the line high frequency sensor, the differential current sensor and the ground fault current sensor and generates a signal indicative of the load current associated with a branch of the power circuit. Output of the signal conditioner is sampled and processed by a processing resource. The processing resource has stored therein data representing a plurality of time-versus-current curves that define a plurality of regions in which tripping may or may not occur. One region has time data and current data that define a time-duration for a particular current magnitude for which no tripping will occur. Another region has time data and current data that define a time-duration of a particular current magnitude for which tripping will occur. Processing resource processes sampled signal to determine the region to which the processed time data and current data correspond, and generates a signal to initiate tripping if the sampled signal yields a time duration for a particular current magnitude that corresponds to a region for which tripping must occur.
Owner:SIEMENS IND INC

Multifunctional residential circuit breaker

An electrical fault detection device for use in a branch of a power circuit that utilizes signals from an AC line current sensor coupled to an electrical distribution line having a primary and neutral lines, a line high-frequency sensor coupled to the electrical distribution line, a differential current sensor coupled to the primary and neutral lines, and a ground fault current sensor coupled to the primary and neutral lines. A signal conditioner receives the signals outputted by AC current line current sensor, the line high frequency sensor, the differential current sensor and the ground fault current sensor and generates a signal indicative of the load current associated with a branch of the power circuit. Output of the signal conditioner is sampled and processed by a processing resource. The processing resource has stored therein data representing a plurality of time-versus-current curves that define a plurality of regions in which tripping may or may not occur. One region has time data and current data that define a time-duration for a particular current magnitude for which no tripping will occur. Another region has time data and current data that define a time-duration of a particular current magnitude for which tripping will occur. Processing resource processes sampled signal to determine the region to which the processed time data and current data correspond, and generates a signal to initiate tripping if the sampled signal yields a time duration for a particular current magnitude that corresponds to a region for which tripping must occur.
Owner:SIEMENS IND INC

Combination speaker / light fixture

A combination light and sound producing fixture is disclosed for installation in a wall or ceiling or on a wall or ceiling. The sound producing elements is an arrangement of speakers having a low frequency transducer and one or more high frequency transducers oriented directed to emit sound in a particular direction. The fixture may further include digital signal processing to modify the sound to account for obstructions in near or around the fixture. The fixture may include a feedback system that allow the fixture to self modify its frequency response. The signal to the fixture is provided by wired or wireless interface. The surface of the sound transducer can be reflective in nature to provide focusing or diffusion of the light from the lighting elements. The lighting elements are incandescent, fluorescent or low voltage LED type that may include adjustment for lighting intensity or color.
Owner:WESTERN VENTURE GROUP +2

Flow cable partial discharge online monitoring system

The invention discloses a flow cable partial discharge online monitoring system, comprising a high frequency sensor, an extra-high frequency sensor, a preposition conditioning unit, a detection front end and a portable detection terminal, wherein the preposition conditioning unit comprises a preposition high frequency conditioning unit and a preposition extra-high frequency conditioning unit; the preposition high frequency conditioning unit is correspondingly connected with the high frequency sensor; the preposition extra-high frequency conditioning unit is correspondingly connected with the extra-high frequency sensor; the detection front end is connected with the preposition conditioning unit, and is used for collecting a signal transmitted by the preposition conditioning unit and sending relevant data after characteristic parameters of the signal are extracted; the portable detection terminal is wirelessly connected with the detection front end, and is used for receiving data sent by the detection front end and performing analysis and diagnosis on the data. The flow cable partial discharge online monitoring system is flexible and convenient to use, large in the coverage area, and capable of continuously working for a long time, greatly improving the antijamming capability of the field, and improving the reliability of a field detection result.
Owner:STATE GRID CORP OF CHINA +2

Combination speaker / light fixture

A combination light and sound producing fixture is disclosed for installation in a wall or ceiling or on a wall or ceiling. The sound producing elements is an arrangement of speakers having a low frequency transducer and one or more high frequency transducers oriented directed to emit sound in a particular direction. The fixture may further include digital signal processing to modify the sound to account for obstructions in near or around the fixture. The fixture may include a feedback system that allow the fixture to self modify its frequency response. The signal to the fixture is provided by wired or wireless interface. The surface of the sound transducer can be reflective in nature to provide focusing or diffusion of the light from the lighting elements. The lighting elements are incandescent, fluorescent or low voltage LED type that may include adjustment for lighting intensity or color.
Owner:WESTERN VENTURE GROUP +2

High frequency Coriolis mass flowmeter digital signal processing system

The invention relates to a high frequency Coriolis mass flowmeter digital signal processing system. The high frequency Coriolis mass flowmeter digital signal processing system comprises a DSP chip, a first signal conditioning module, a second signal conditioning module, a constant flow source, a Pt100 platinum resistor, a first ADC, a second ADC, a third ADC, an analog driver module, an external expansion FLASH module, a PWM output module, a current output module, an external expansion UART module, an HART modulation module, a man-machine interface module, a power down protection module and software. For signal processing of a high frequency Coriolis mass flow sensor, a TMS320C6726 chip with the strong operational capability and the high processing speed is used as a core processor, and the high frequency Coriolis mass flowmeter digital signal processing system is invented. Based on the zero-cross detection algorithm and DTFT algorithm, the high frequency Coriolis mass flowmeter digital signal processing system solves the problem that the algorithm cannot guarantee real-time performance after sampling frequency of high frequency sensor signals is increased.
Owner:HEFEI UNIV OF TECH

Screw-in LED light and sound bulb

A combination light and sound producing fixture and combination screw-in light with speakers element is disclosed where the fixture is installed in a wall or ceiling or on a wall or ceiling. The light bulb / speaker can be screwed or secured into a standard light bulb socket. The sound producing elements is a coaxial arrangement of speakers having a low frequency transducer and one or more high frequency transducers that can be directed to emit sound in a particular direction. The fixture or bulb may further include digital signal processing to modify the sound to account for obstructions in or near the fixture. The surface of the sound transducer can be reflective in nature to provide focusing or diffusion of the light from the lighting elements. The lighting elements are incandescent, fluorescent or low voltage LED type that may include adjustment for lighting intensity and color.
Owner:ENLIGHTENED AUDIO INC

High-voltage power cable fault recognition method

The invention discloses a high-voltage power cable fault recognition method, and the method comprises three processes: signal combining collection, signal comprehensive processing, and fault intelligent recognition. The process of signal combining collection comprises the steps: collecting electromagnetic transient states and electromagnetic waves through employing a UHF ultrahigh frequency sensor, collecting supersonic signals through employing a piezoelectric-type AE supersonic sensor, collecting ground waves through employing a TEV ground wave sensor, and collecting a transient magnetic field through employing an HFCT high-frequency current sensor. The process of signal comprehensive processing comprises the steps: extracting a plurality of statistical feature parameters representing discharging intensity from partial discharge broadband time domain data, extracting various types of feature parameters of partial discharge caused by a cable fault, and constructing a partial discharge fingerprint feature library corresponding to various types of defects. The process of fault intelligent recognition comprises the steps: enabling the extracted time domain feature parameters to be inputted into two types of intelligent recognition algorithms in batches for automatic matching and recognition, carrying out constant comparison and gathering of the recognition results of the two algorithms, and determining the type and size of the fault. The method is safe in detection, is quick and accurate in fault recognition, and can be integrated.
Owner:STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +3

Method and system for emitter localisation

Process and system for the location of emitters in the radar frequency range on the basis of cross position-finding by at least two flying platforms with, in each case, at least one passive HF sensor for ascertaining the geometrical and electronic properties of the emitter beams, whereby the flying platforms mutually exchange data for describing the geometrical and electronic properties of the emitter beams, and whereby from the plurality of the position-finding beams' possible intersection points, which arise from the emitter surveying operation, use is made, in order to determine the emitter position, of those intersection points at which the electronic properties of the intersecting emitter beams are identical.
Owner:AIRBUS DEFENCE & SPACE

Multi frequency 2d phased array transducer

Improved two-dimensional planar array transducer and beamformer apparatus and methods. In one embodiment, the two-dimensional planar array transducer is capable of simultaneously or sequentially forming multiple acoustic beams in two axes and at two or more widely separated acoustic frequencies from a single flat planar array transducer. The transducer planar array consists of two or more electrically and acoustically independent two dimensional planar transducer array structures operating at different frequencies that are physically integrated onto a single multi frequency configuration. In an exemplary embodiment, a second higher frequency transducer array is positioned within the aperture area of a lower frequency planar array transducer. Methods of using the aforementioned two-dimensional planar array transducer and beamformer are also disclosed.
Owner:ROWE TECH

Sensor cover and method of construction thereof

A sensor cover is disclosed for camouflaging a high frequency sensor, including for example, a radar sensor. The sensor cover includes a substrate having a non-planar surface with non-signal transmitting regions and signal transmitting regions. A metal layer is disposed on each of the non-signal transmitting regions. Further, each of the non-signal transmitting regions is separated by one of the signal transmitting regions. The method of constructing such a sensor cover is also disclosed.
Owner:VEONEER US LLC

Generator local discharge on-line monitoring device and monitoring method thereof

A generator local discharge on-line monitoring device comprises a ceramic capacitive transducer 1, a ceramic capacitive transducer 2, and a high frequency transducer 3 which are connected with a signal conditioner unit 4, the signal conditioner unit 4 is connected with an acquisition card 5, the acquisition card 5 is output via optical fiber and is connected with a network card of an industrial personal computer (IPC) 6, and the IPC 6 is connected with a Web server 7. The monitoring method thereof comprises: taking a signal at location of a neutral point, dividing coupled signal into 1000 segments by the high frequency transducer 3, calculating the maximum value of each segment and the average value, taking the average value as signal dynamic threshold value, then comparing with the absolute value of the neutral point signal, eliminating if smaller than dynamic threshold value, otherwise, comparing again, judging as a discharge point if the polarities are identical, and judging as an interference signal if the polarities are opposite. The invention has the characteristics of good anti-interference effect, high security and easy and convenient application.
Owner:西安博源电气有限公司 +1

Method and apparatus for partial discharge detection of high-voltage electrical power equipment with hardware anti-interference utilization

ActiveCN102243289ATo achieve the purpose of anti-background noise interferenceNoise is clearly displayedTesting dielectric strengthFrequency spectrumData acquisition
The invention provides a method and an apparatus for partial discharge detection of high-voltage electrical power equipment with hardware anti-interference utilization. The apparatus comprises a main-broadband high-frequency sensor, an auxiliary- broadband high-frequency sensor, a power-frequency voltage sensor and a calculating host of synchronous analysis. The calculating host of synchronous analysis, which comprises a data acquisition module, a data processing module, an interference filtering module, and an input and output module, is used for collecting a partial discharging signal, a background interference signal, and a power frequency voltage signal as well as eliminating an interference and storing data. The main-broadband high-frequency sensor, the auxiliary- broadband high-frequency sensor, and the power-frequency voltage sensor are accessed in parallel to the data acquisition module of the calculating host of synchronous analysis. An advantage of the invention is to utilize hardware; that is, the auxiliary- broadband high-frequency sensor collects alone an interference signal of background noise; and then a difference of the noise signal and the partial discharging signal on a frequency spectrum is utilized, so that an objective of realization of resistance of the background noise interference of the hardware is achieved.
Owner:STATE GRID ELECTRIC POWER RES INST

Complex frequency sandwich structure ultrasonic transducer

The invention discloses a complex frequency ultrasonic transducer for thermal ultrasonic lead bonding and thermal ultrasonic inversion seal equipment. An energy concentrator comprises a first-class energy concentrator tapered section, a column section and a second-class tapered energy concentrator, wherein the tail part of the first-class energy concentrator tapered section is provided with a front cover plate, and a plurality of copper sheet electrodes and a plurality of piezoelectric ceramic wafers are installed at intervals; and each copper sheet electrode and each piezoelectric ceramic wafer are clamped between the front cover plate and a rear cover plate and tightly pressed and fixed by pre-tightening screws. A third-class energy concentrator, a second-class energy concentrator, a clamping flange, the front cover plate and the rear cover plate are machined by using the same material as a whole. The transducer works near a frequency point of 60kHz and 100kHz and has no modal dense condition near a resonance point, and the seal at low temperature below 60 DEG C can be realized by adopting a high-frequency transducer of 100kHz. The invention adopts an integrated two-class energy concentrator structure, realizes high-power magnification, reduces the weight and inertia of a mechanism by adopting a titanium alloy material and improves the heat radiating performance and the service life of the transducer.
Owner:五莲县计量检测服务中心

Examination verification apparatus of high-frequency-current-method partial discharge detector and method thereof

The invention discloses an examination verification apparatus of a high-frequency-current-method partial discharge detector and a method thereof. The apparatus comprises a signal excitation source, a matching resistor R0, an injection capacitor C0, a first metal test rod, a second metal test rod, an oscilloscope and a 50omega coaxial cable. A detected apparatus comprises a partial discharge detector and a high frequency sensor. The signal excitation source is a built-in signal source of the apparatus and the signal source is divided into a sine wave signal source and a pulse calibration source. The matching resistor R0 is connected in series with the sine wave signal source and the first metal test rod so as to combine and form a sine signal loop. The injection capacitor C0 is connected in series with the pulse calibration source and the second metal test rod so as to combine and form a pulse signal loop. The apparatus and the method are easy to realize, debugging is simple and rapid, and a test process is convenient and rapid. In the invention, the built-in signal source and an external signal source can be freely selected to carry out signal input. The apparatus and the method are suitable for routine maintenance, testing, verification and other occasions of the high-frequency partial discharge detector in an electric power detection industry.
Owner:HANGZHOU XIHU ELECTRONICS INST

Microstrip antenna and high frequency sensor using microstrip antenna

A microstrip antenna has feed element 102 and parasitic elements 104, 106 on the front surface of substrate 1. Microwave electrical power is applied to feed element 102. Parasitic elements 104, 106 are connected via through hole type leads passing through substrate 1, to switches upon the rear surface of substrate 1, respectively. By actuating the switches individually, parasitic elements 104, 106 are individually switched between a grounded state and a float state. The direction of the radio beam emitted from the microstrip antenna is varied by selecting which of parasitic elements 104, 106 is grounded and floated. A microwave signal source connects to feed element 102 via an feed line 108 very much shorter than the wavelength, accordingly the transmission losses being low and the efficiency being excellent.
Owner:TOTO LTD

Switch cabinet partial discharging detection system and method

InactiveCN108919066AAccurate detectionAvoid detecting defects with inaccurate detectionTesting dielectric strengthCommunication interfaceElectric power system
The invention discloses a switch cabinet partial discharging detection system and method, and relates to the technical field of electrical power system detection. The switch cabinet partial discharging detection system comprises an ultrasonic sensor, a ground electric wave sensor, a plurality of ultrahigh frequency sensors, a plurality of filter and amplification units, a FPGA control high-speed A / D sampling unit, a DSP comprehensive number processing unit, a storage unit, a display unit, a keyboard input unit, a communication interface and a power frequency signal input unit. Signals of an ultrasonic frequency segment, a ground electric wave segment and an ultrahigh frequency segment are gathered through the ultrasonic sensor, the ground electric wave sensor and the ultrahigh frequency sensors, accuracy detection of partial discharging types, discharging intensity and discharging point positions of a switch cabinet are realized, the defects that detection accuracy is not high due to the fact that energy releasing types are different of different discharging types and differences of practicability and sensitivity of different detection methods are overcome, and the detection accuracy is effectively improved.
Owner:ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD

Simulated partial discharge detection device for switch cabinet

The invention provides a simulated partial discharge detection device for a switch cabinet. The simulated partial discharge detection device comprises a power supply module, a switch cabinet module and an electrical pulse partial discharge detection module, wherein the switch cabinet module consists of a cabinet body, an ultrasonic sensor, a high-frequency sensor, a TEV (Transient Earth Voltage) sensor, a video monitoring system and a discharge model, the power supply module outputs a stable voltage to the discharge model, the discharge model simulates the partial discharge phenomenon of the switch cabinet in the cabinet body, the ultrasonic sensor, the high-frequency sensor and the TEV sensor collect various parameters of the discharge model during simulating the partial discharge phenomenon of the switch cabinet, and sends the collected parameters to the electrical pulse partial discharge detection module, and the video monitoring system collects the image data during the partial discharge process of the discharge model. The discharge model can accurately simulate the partial discharge phenomenon of the switch cabinet, all sensing equipment accurately collect the parameters, and then the electrical pulse partial discharge detection module analyzes the parameters, so that complicated simulation detection operations are not required, the detection efficiency is high and various defects can be widely simulated.
Owner:GUANGZHOU POWER SUPPLY CO LTD

Real-time online early warning device and method for insulation faults of transformer

The invention relates to a real-time online early warning device and method for insulation faults of a transformer. The device is characterized in that a partial-discharge ultrahigh frequency sensor is mounted at a transformer inspection hole or an accident oil drain valve; the partial-discharge ultrahigh frequency sensor is connected to a partial-discharge ultrahigh frequency signal conditioner through a coaxial cable; the partial-discharge ultrahigh frequency signal conditioner is connected to an internal A / D (Analogue-to-Digital) acquisition card of an industrial personal computer through a coaxial cable; an iron core grounding current sensor is mounted at a transformer core leading-out wire and a grounding grid; the iron core grounding current sensor is connected to an iron core grounding current signal conditioner through a shielding signal wire; the iron core grounding current signal conditioner is connected to the internal A / D acquisition card of the industrial personal computer through the shielding signal wire; and a CAN (Controller Area Network) card of the industrial personnel computer is connected to a CAN network. The real-time online early warning device completes original sample data display and storage, and insulation fault signal analysis and calculation in real time on line, and immediately provides early warning information of transformer insulation faults according to the transformer working condition information acquired through the CAN communication card; and fault latency time is less than 1s.
Owner:大唐观音岩水电开发有限公司

Mutual coupling based calibration technique for structurally deformed phased array apertures

A phased array antenna includes a plurality of subarrays, and each subarray includes a panel, a plurality of primary antenna elements positioned on the panel, and at least one pair of sensor antenna elements positioned along a perimeter of the panel. One of the sensor antenna elements is a transmitting sensor antenna element and the other sensor antenna element is a receiving sensor antenna element. Changes in the mutual coupling between the two high frequency sensor antenna elements as a function of deformation of the subarrays provides a calibration signal outside of the operational band of the array while the array is operated and without requiring external calibration sources.
Owner:THE GOVERNMENT OF THE UNITED STATES OF AMERICA AS REPRESENTED BY SEC OF THE NAVY

High-frequency sensor and sensitivity detecting device and method thereof

The invention provides a high-frequency sensor and a sensitivity detecting device and method thereof. The device comprises a signal source, a cable and a local discharge detecting device. The signal source transmits a high-frequency signal to the cable according to a preset frequency, the local discharge detecting device monitors the local discharge of the cable through the to-be-detected high-frequency sensor so as to obtain the local discharge signals of the cable, the amplitude of the high-frequency signal transmitted by the signal source is adjusted repeatedly, the signal, corresponding to the lowest amplitude of the high-frequency signal, in the local discharge signals detected by the local discharge detecting device is searched, and the sensitivity of the to-be-detected high-frequency sensor is determined according to the lowest-amplitude signal. The device has the advantages that sensitivity detection of the high-frequency sensor is achieved by the device, the device is simple in structure and detecting method and simple to operate, intermediate link operation and measuring errors are reduced, high-frequency sensor sensitivity detecting precision is increased effectively, and detecting efficiency is increased effectively.
Owner:GUANGZHOU POWER SUPPLY CO LTD +1

Insulation electrified detection device for cable accessories

The invention discloses an insulation electrified detection device for cable accessories. The insulation electrified detection device comprises sensors, a system case, a portable mainframe and a detection software system. The sensors include two high-frequency current sensors, an ultrahigh-frequency sensor and an ultrasonic sensor; partial discharge signals in the cable accessories are coupled to be sent into the system case; the system case comprises a signal conditioning unit, a data acquiring unit, an integral power supply unit and a switch circuit and is used for completing front-position conditioning, sampling processing and data transmission of the partial discharge signals; the system case and the portable mainframe are connected through a USB (universal serial bus) communication line; the portable mainframe is equipped with the detection software system to process, analyzing and diagnosing the partial discharge data and set up a partial discharge database. By the aid of the insulation electrified detection device for the cable accessories, sensitivity, signal-to-noise ratio and antijamming capability in partial discharge electrified detection of the cable accessories can be improved, and field signals can be automatically processed in real time to give out onsite diagnostic analysis results.
Owner:SHANGHAI JIAO TONG UNIV

System and method for monitoring pipeline leakage based on high-and-low-frequency hybrid detection

The invention provides a system and method for monitoring the pipeline leakage based on high-and-low-frequency hybrid detection. The system comprises a head end ultrahigh frequency sensor, an end ultrahigh frequency sensor, a head end acceleration sensor, an end acceleration sensor, a head end lower computer, an end lower computer, a head end upper computer and an end upper computer; a method based on the system is also provided, the method comprises the following steps of: acquiring high-frequency and low-frequency mixed historical data and classifying the working conditions of the high-frequency and low-frequency mixed historical data, performing preprocessing, multi-information domain analysis processing and feature extraction, processing by using a covariance kernel slice inverse regression algorithm to obtain a feature vector subspace, acquiring high-frequency and low-frequency mixed real-time data, obtaining the feature vector subspace according to the steps of acquiring the historical data, classifying the feature vector subspace by using a linear discriminant analysis, calculating the similarity, obtaining the real-time data classification result, and if the leakage exists,calculating the leakage position, providing a reliable data basis for the troubleshooting. The accuracy of the leakage feature value is ensured, the false alarm is reduced to the maximum extent, andmore accurate judgment is made on the leakage of a small flow.
Owner:NORTHEASTERN UNIV

Multiple waveguide coaxial ceiling loudspeaker

A flush mountable ceiling speaker (10) with individual coaxial waveguides (20, 22) for both the lower and high-frequency transducers (11, 12). The lower frequency radiation is combined with the sonic energy radiated by the high-frequency transducer (12) and shaped by the high-frequency waveguide (20) to create a coherent, uniformly controlled coverage pattern. The loudspeaker (10) creates a well defined sound dispersion pattern over a relatively large bandwidth, resulting in increased vocal intelligibility and more accurate reproduction of music at relatively great distances from the loudspeaker, as is particularly useful in association with high ceiling installations.
Owner:TELEX COMMUNICATIONS

Method and system for data synchronization of vehicle sensor in automatic driving

The invention provides a method and system for data synchronization of a vehicle sensor in automatic driving. In order to timely and rapidly perform identification and judgment of environmental factors in automatic driving, high-frequency signals obtained by a high-frequency sensor is preferentially calculated, a time difference of data transmission of high- and low-frequency sensors is calculated, synchronous matching judgment is performed on the high-frequency signals and low-frequency signals, a calculation result of the high-frequency signals is verified through the low-frequency signals, and a controller sends out an execution instruction, thereby shortening analysis time of a central processing unit, improving reaction sensitivity of the sensors in automatic driving and data fusion performance of multiple sensors, and through setting of multilevel judgment, errors brought by abnormal time data are reduced, and a capability of filtering wrong data is increased.
Owner:WUHAN KOTEI TECH CORP
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