242 results about "High frequency transducer" patented technology

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.

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.

A sensor device for measuring the compression travel and/or the compression rate of wheels and/or axles of vehicles, in particular of commercial vehicles, may include at least one sensor measuring in a contactless manner. The sensor device may include a radar and/or high-frequency sensor generating a beam, which is emitted and received after reflection at a reference and reflection surface.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The invention discloses a performance testing device for a partial discharge ultra-high frequency sensor. The device comprises a gigahertz transverse electromagnetic cell, a vector network analyzer, a polytetrafluoroethylene cover plate, a data processing computer, a checking antenna and the ultra-high frequency sensor to be tested. The vector network analyzer is used simultaneously as signal input and output ends, so that the device is high in cost performance and convenient to implement. The invention further provides a method for testing the performance of the sensor by utilizing the testing device. Time-domain and frequency-domain parameters representative of the performance of the sensor can be simultaneously given, and the advantages of reliability, accuracy and the like are achieved.