780 results about "Pulse (signal processing)" patented technology

The invention discloses a comprehensive collection method and a device with three-state data of electrical parameters: steady state, fault recorder data and dynamic data, and the device is characterized in that the device consists of a high-precision time synchronization module, a synchronous sampling pulse module, an alternating current signal conditioning module, an A/D sampling module, a direct current signal conditioning module, a voltage frequency conversion module, a switch quantity signal conditioning module, a signal processing module, a recording module and a high-speed network communication module, etc. The method and the device have the advantages that: the use of the high-precision time synchronization module and the high-performance signal processing and the communication technologies can realize the synchronous collection of the three-state data of the electrical parameters, complete the functions of monitoring, fault recording, phase angle measurement and power quality analysis, etc., improve the data processing capability and the sampling precision, improve the real-time property of an automatic system of a substation, simplify the design, the manufacture and the operation of secondary equipment of the automatic system of the substation and greatly reduce the construction cost and the maintenance cost of the substation.

Apparatus and methods for performing acoustical measurements are provided having some and preferably all of the following features: (1) the system is operated under near-field conditions; (2) the piezoelement or piezoelements used in the system are (a) mechanically and electrically damped and (b) efficiently electrically coupled to the signal processing components of the system; (3) each piezoelement used in the system includes an acoustical transformer for coupling the element to a gaseous test medium; (4) speed of sound is determined from the time difference between two detections of an acoustical pulse at a receiver; (5) cross-correlation techniques are employed to detect the acoustical pulse at the receiver; (6) fast Fourier transform techniques are used to implement the cross-correlation techniques; and (7) stray path signals through the body of the acoustic sensor are removed from detected signals prior to signal analysis. Techniques are also provided for performing acoustical measurements on gases whose thermodynamic properties have not been measures and on mixtures of compressible gases. Methods and apparatus for performing feedback control of a gas of interest in a mixture of that gas and a carrier gas are provided in which the controlled variable is the flow of the carrier gas.

In a method and a corresponding apparatus for performing chaotic optical time domain reflectometer, the chaotic laser signal, generated by the chaotic laser transmitter, is split into probe signal I and reference signal II by a fiber coupler. Through an optical circulator, the probe signal I is launched into the test fiber and the echo light is converted into electrical signal by a photodetector and digitalized by an A/D converter. The reference signal II is converted into electrical signal by a photodetector and digitalized by another A/D converter. Two digital signals received from two A/D converters are correlated in a signal processing device to locate the exact position of faults in fibers. The result output is then displayed on a display device. This invention was developed to overcome the tradeoff between resolution and dynamic range of the pulse-based OTDR. This method can improve the dynamic range and spatial resolution significantly; enhance the anti-jamming capability and noise tolerance. Also it has merits of simple structure and lower cost.

The invention relates to a traditional Chinese medical science pulse-taking instrument, which comprises a flexible body, a flexible pressure sensor array, an air bag, a signal processing system and a connecting structure; the flexible body is used for arranging the flexible pressure sensor array and the air bag; the air bag covers the side, far away from a wrist, of the flexible pressure sensor array; the connecting structure is used for fixing the flexible body at the wrist of a user. According to a pressure signal collected by the flexible pressure sensor array at the area of the radial styloid process of the wrist, the signal processing system determines the position of the highest point of the radial styloid process, and by combining the position of the highest point of the radial styloid process and a pressure signal collected by the flexible pressure sensor array at the area of a radial artery vessel of the wrist, the positions of Cun-Guan-Chi pulse points are finally determined. The invention further relates to a method for determining the Cun-Guan-Chi positions by using the pulse-taking instrument. The traditional Chinese medical science pulse-taking instrument can automatically search for Cun-Guan-Chi pulse points, and the degree of accuracy, repeatability and usability of the traditional Chinese medical science pulse-taking instrument are improved.

The invention discloses an electrical stimulation rehabilitation device on the basis of feedback control on angle information and electromyographic signals. The device comprises a plurality of groups of electrical stimulation channels, an electromyographic signal processing module, an angle transmission module, a controller and an electrical stimulation output module, wherein each group of electrical stimulation channels comprises a plurality of electrode plates arranged on the same muscle; the electromyographic signal processing module is used for extracting characteristic values of electromyographic signals acquired by the electrode plates; the angle transmission module is used for detecting a motion angle value of a lower limb; the controller is used for determining muscle stimulation positions and stimulation parameters in a next step according to the motion angle value of the lower limb, amending the stimulation parameters according to the characteristic values of the electromyographic signals and generating electrical stimulation pulses; the electrical stimulation output module is used for outputting the electrical stimulation pulses to the corresponding electrode plates. The invention also discloses an electrical stimulation method on the basis of the feedback control on the angle information and the electromyographic signals. According to the invention, not only is closed-loop control of electrical stimulation implemented, but also effectiveness of the stimulation on muscles is sufficiently considered, the stimulation effect is always in an optimal state, muscle fatigue is effectively reduced, and electrical stimulation rehabilitation training time is prolonged.

The invention discloses a fiber bragg grating sensing method and system based on a wavelength-division multiplexing multichannel output time-domain address finding technology. A controlled light source is provided and outputs light wave signals which are scanned by wavelengths. The light wave signals are coupled with a coupler after being subjected to bragg reflection. Finally, the light wave signals are converted to electric pulse train signals and transmitted to a delay control switch array after being amplified, and the electric pulse train signals are distributed and output in sequence among output channels of the delay control switch array through the delay control switch array, so that time-domain address finding is realized. With the help of wavelength scanning and selective conduction of an analogue electronic switch array, a wavelength-division multiplexing signal processing technology is organically combined with the time-domain address finding technology, therefore, a demand of an optical distance interval between adjacent sensing elements in an ordinary time-domain address finding technology is converted into a demand of a wavelength interval, so that the dependence on accessing a delay optical fiber between the adjacent sensing elements is avoided.

The invention provides a few-mode fiber mode coupling measurement device based on a two-photon lantern and a few-mode fiber circulator and belongs to the technical field of fiber characteristic measurement. The few-mode fiber mode coupling measurement device is composed of a light source, a photon lantern A, a few-mode fiber circulator, a measured fiber, a photon lantern B, a photoelectric detection module and a signal processing module. An optical pulse signal generated by the light source is subjected to spatial mode conversion through the photon lantern A to output a designated single stimulus mode, combined with the single-way transmission characteristics of the few-mode fiber circulator, the stimulus mode enters the measured fiber through the few-mode fiber circulator, a backward Rayleigh scattered light generated by coupling the stimulus mode in the measured fiber and the stimulus mode to the non-stimulus mode enters the photon lantern B through the few-mode fiber circulator for spatial model demultiplexing and being output from a corresponding mode port, and the output backward scattered light of each path is subjected to photoelectric detection and data processing, so that the measurement of the few-mode fiber mode coupling coefficient is achieved.

The invention discloses a distributed fiber sound wave detection apparatus and method based on wave beam formation. The apparatus comprises a light source, a 1*2 coupler, a control and signal processing unit, an arbitrary waveform generator, a double-channel parallel Mach-Zehnder electro-optical modulator, a reference arm fiber, an erbium doped fiber amplifier, an optical filter, an annular device, a front-end reflector, a reference length fiber, a rear-end reflector, a sense fiber, a 90-degree optical mixer, and a balance detector. The method includes the steps: injecting signal light into the sense fiber, the signal light being modulated to be light pulses with a fixed frequency on a lower side and a sweep frequency on an upper side; mixing the returned signal light carrying light phase information and light frequency spectrum information of detecting points with local reference light; demodulating the light phase information and the light frequency spectrum information, and obtaining the frequency, amplitude and phase information of sound waves in the detecting points in the sense fiber; and finally calculating the position, intensity and frequency information of sound sources. The sensing function and the transmission function of a fiber are combined into one function. Therefore, the distributed fiber sound wave detection apparatus and method have the advantages that the detecting point scale is hundred times higher than that of the prior art.

Provided in the invention is a method for detecting a solid-state laser radar device. The method comprises: one single laser light source in an array laser device in a transmitting module works to emit detection light; step two, one column corresponding to the single laser light source working in the previous step in an array photoelectric sensor works; step three, the working column in the arrayphotoelectric sensor receives detection light reflected by a detected object; step four, a signal processing module reads electrical signal information received by the working column in the array photoelectric sensor, a signal processing module compares detection light emitted by the transmitting module with the detection light reflected by the detected object and received by the column in the receiving module to obtain a time difference, and a distance value is calculated based on a pulse flight time method; and step five, the previous four steps are repeated; a main control module controls different single laser light source in the array laser device to work when the step one is repeated each time; after each of all single laser light sources in the array laser device in the reflection module works at least once, one-frame point cloud distance data detection of the solid-state laser radar device is completed.

The invention relates to a neutron logger for measuring stratigraphic porosity in borehole, and its technical solution mainly comprises top joint, casing, power supply framework, thermos flask, neutron detector (He 3 tube), signal processing circuit framework, screening body, neutron source house, and bottom joint, as well as pulse signal processing circuit, communication control and data transmission circuit, and power supply circuit, and it is characterized in that: the neutron detector is composed of two neutron detectors on the same side of the neutron source, where the two neutron detectors are respectively called short spacing (SS) and long spacing (LS), according to their spacing from the neutron source. And the SS and LS neutron detectors, screening body, fixing devices and pulse signal processing circuit are arranged in a heat insulating device and the two neutron detectors are both coated with thermal conductivity protective layers. The invention has high detecting efficiency, higher error compensation and data processing accuracy, high integrity of signal processing circuit and power supply circuit, and strong stability, convenient to use and maintain.

An electronic device including an array of addressable registers storing data. An input register connected to the array stores an input command parameter (e.g an opcode of a command) and its associated operands in one or more input registers connected to the addressable register array. A single instance of a command accesses the at least one register of the array. Based on the input command parameter, the command for all of the address operands: reads a datum of the data previously stored in at least one register, updates the datum thereby producing an updated datum, and writes the updated datum into at least one register. The command has multiple address operands referencing the one or more registers and supports two or more of the address operands being identical. The device includes logic circuitry which provides a logical output signal to the processing circuitry indicating which, if any, of the address operands are identical. The processing circuitry based on the logical output, processes first any identical address operands prior to writing the updated datum into the at least one register so that a new instance of the command begins processing by the processing circuitry on a consecutive clock pulse and the command throughput is one command per clock pulse.

The invention provides a rotor displacement measurement device and method for a planer motor. According to the method, two sets of magnetic flux density sensors are respectively and uniformly distributed in a field pole polar distance tau in two mutually perpendicular moving directions of a sine magnetic field area formed by a stator magnetic steel array on the planer motor, sampled signals of the four sets of sensors are subjected to frequency multiplication operation by a signal processing circuit respectively to obtain four subdivided signals, zero crossing points of the four subdivided signals are detected to generate two orthogonal pulse signals, pulses of the two orthogonal pulse signals are counted respectively and the phase differences of the two orthogonal pulse signals are detected respectively. According to the invention, based on the magnetic field information of the planar motor, the magnetic field space tau is subdivided to realize the long-travel high-accuracy rotor displacement of the planar motor. Through adoption of the device and method disclosed by the invention, the problems caused by the requirements of long travel and high accuracy that calculation methods are complicated or hardware is inconvenient to install and the total cost of a measurement device is high can be solved.

The invention discloses a power cable fault location method based on a transfer function method, which particularly comprises that, the transfer function method obtains fault information of power cables by multiple inputs of voltage signals, the fault information includes calibrating signals and test signals, a transfer function of a circuit calibrating equivalent model is found through related technologies of signals and signal processing, original pulse is regarded as input signals in the equivalent model, reflected pulse is regarded as output signals, and the transfer function of the equivalent model is obtained. Wave speed and power cable length are known, so that fault locations of power cables are determined. The method for treating the fault information is low in cost and convenient to operate, and accurate location is achieved through related algorithm.

The invention discloses a safety monitoring system of a long-distance pipeline, comprising a transmitted and received light signal processing module 1, a light delay component 2, a single-line optical fiber 3 and a nonlinear optical environment 4 with a probing blind area, which are all formed into a variant-type optical fiber Sagnac interferometer. A polarization control element is used for ensuring the maximum interference intensity, and at least three wavelengths and three coherent light pulse signals are used for independently obtaining data to inhibit noise produced by the light source fluctuation and the polarization state change. The preservation time of A/D sampling is greater than the value of a pulse width, and the A/D sampling frequency is greater than the light source repetition frequency. A probe completely transforms each returned coherent light pulse so that an electric signal is undistorted. A single detection system has no relay to detect the distance of over 100 km.

A pulse accumulation event real-time processing method includes the steps of generating a fitting baseline value look-up table and a fitting energy value look-up table of a pulse falling edge, completing the recognizing of accumulated pulses and the triggering of the pulse signal processing process through a multi-voltage threshold value sampling method, obtaining information of a part not correctly sampled due to pulse accumulation through pulse prior information and collected pulse information in the form of the look-up tables, and completing real-time recovery of accumulated pulse information. The recognizing of high-counting-rate lower accumulated pulses and the triggering of the pulse signal processing process are completed through the multi-voltage threshold value sampling method, the information of the part not correctly sampled due to pulse accumulation is obtained through pulse prior information and collected pulse information in the form of the look-up tables, and the real-time recovery of the accumulated pulse information is completed. The method is simple and efficient and can be easily implemented on a detector-level real-time data collecting system, and an excellent accumulated pulse information recovery effect can still be achieved under the condition of a low sampling rate.

The invention discloses a cable identification device. The cable identification device comprises a signal generator and a signal receiver, wherein the signal generator comprises a power module, a high-voltage transformation unit and a discharge control unit, the high-voltage transformation unit comprises an electronic pulse generation module as well as a voltage detection circuit and a pulse capacitor which are connected onto the electronic pulse generation module in parallel, and the discharge control unit comprises time relays for controlling periodic discharge for cables, direct current electromagnets and a mechanical periodic discharge switch connected to an output end of the pulse capacitor; the signal receiver comprises a flexible Rogowski coil, a control unit, a signal processing unit connected with the flexible Rogowski coil, a data acquisition unit, a triggering unit and a human-machine interaction unit which are connected with the control unit as well as a power management module for supplying electricity to all the units in the signal receiver. The cable identification device has characteristics of stable and reliable identification performance, high anti-interference performance, high applicability, small size and the like.

The invention discloses a laser radar weak signal extraction and decomposition method based on fractional order Fourier transformation, and belongs to the laser radar signal processing technical field; the method comprises the following steps: 1, carrying out fractional order Fourier transformation for noise-containing laser radar echo signals, obtaining a FRFT spectrum, and converting one dimension signals into a 2D image; 2, using a mean filtering, wavelet filtering and Butterworth filtering compound filtering method to make image enhancement for the FRFT spectrum; 3, clustering enhanced FRFT spectrum image data, and determining a clustering quantity and separating each piece of cluster data; 4, recording position and intensity of separated each piece of cluster data, screening valid data points, carrying out least square fitting for reserved data so as to obtain a flight time, a pulse width and an amplitude, thus finishing laser radar echo signal extraction and component decomposition. The 2D time-frequency analysis method for the laser radar signal processing has a stronger anti-noise ability and a more accurate decomposition result.

The invention discloses a ground-based terahertz cloud detection radar system and a detection method thereof. A linear frequency modulation signal generation module generates linear frequency modulation signals with an adjustable pulse width; a frequency synthesizer module generates transmitting excitation signals and receiving excitation signals; a terahertz transmitting module generates terahertz transmitting signals; a terahertz receiving module converts terahertz echo signals to intermediate frequency signals; an intermediate frequency signal receiving and processing module generates baseband signals; a signal processing module carries out signal processing on the baseband signals; and an upper computer completes cloud observation data inversion processing on a signal processing result of the signal processing module. A linear frequency modulation working system and an adjustable pulse width are adopted, a high distance resolution can be acquired, requirements on the system transmitting power can be reduced, cloud observation from a ground near distance to a far distance can be met, radar reflectivity factor information with high cloud profile resolution can be provided, cloud space-time and cloud weather macro and micro information of an observation area can be acquired further, and the system and the method can also be used for detection of tiny particles such as haze in the environment.