54results about How to "Realize signal acquisition" patented technology

The invention discloses an intelligent tool capable of being flexibly expanded and dynamically configured. The intelligent tool comprises a hardware module and a software module. The hardware module comprises a control mainboard, to-be-tested equipment, a plurality of testing circuit units, an interface resource set formed by multiple interfaces and a plurality of adapter plates. The software module comprises embedded software and a script configuration file. A testing process includes the steps of firstly, preparing a hardware environment; secondly, preparing the software, to be more specific, forming the script configuration file according to the testing cases and testing flow of the design testing content of the to-be-tested equipment; thirdly, operating the embedded software after the control mainboard is started, importing the script configuration file, allowing the embedded software to analyze the script configuration file, and executing corresponding operations according to the analyzed testing flow so as to test the to-be-tested equipment.

The invention discloses a portable on-line device for detecting water pollutants. The water sample to be detected is introduced to a beam waist area converging Gaussian beams by adopting a stream guiding method, the average grain diameter and the particle number concentration of the micrometer particle pollutants in water are detected by a transmission fluctuation method, and signal acquisition and processing are carried out through a digital signal processor (DSP); the parallel beams emitted by a laser collimator are converged by a convex lens; the transmission light is converged by a receiving lens, is received by a light signal detector and is converted into electrical signals; a weak signal is connected with a signal acquisition device and a microprocessor after being amplified by an amplifier; the microprocessor is respectively connected with a liquid crystal display and a keyboard through an interface; a draft tube is a bent tube; a water inlet is connected with a one-way driving pump; a detection area is arranged on the beam waist area converging Gaussian beams; the water sample to be detected is introduced to the beam waist area converging Gaussian beams by the one-way driving pump; and below the detection area, the draft tube is provided with a water outlet. The device is light and portable, and can realize online and real-time detection for water pollutants.

A tool magazine reliability test bench tool change position adaptive centering adjustment device and method belong to the mechanical adaptive adjusting field, and aim to solve the problems of low adjusting precision and complex operation and the time-consuming and labor-consuming problems in the prior art. The device comprises a measurement taper shank, an automatic mechanical detection device and a main-shaft bottom feeding unit; and a drive gear and a driven gear in the automatic mechanical detection device are integrally disposed in a tool-grabbing disc, a servo motor A drives the drive gear to rotate, a positioning adjusting rod is connected with the lower end face of a driven gear shaft through an adjusting screw, a measuring rod is connected with the upper part of the positioning adjusting rod through a positioning pin, the positioning pin is located on the axis of the driven gear shaft, a force sensor is fixed to the lower part of the positioning adjusting rod, and the force sensor is connected to the lower part of the measuring rod through a connecting spring. The measurement taper shank is coaxially installed on a mechanical main shaft, the tool-grabbing disc of the automatic mechanical detection device is clamped through a manipulator, and a control unit of a tool magazine reliability test bench controls a motion of the main-shaft bottom feeding unit according to a signal acquired by the force sensor.

The invention discloses a dust concentration detection system based on dual-frequency ultrasound, and a detection method thereof. A dual-frequency ultrasonic sensing unit including a first ultrasonicsensor and a second ultrasonic sensor is adopted to respectively acquire a first ultrasonic signal and a second ultrasonic signal, a temperature sensor is adopted to acquire a temperature signal, thefirst ultrasonic signal and the second ultrasonic signal undergo environmental compensation, the volume concentration of dual-frequency ultrasound compounded multi-phase particles is obtained by a feature fusion algorithm in order to realize the complementation of the test performance or test data, make up for the deficiency of single frequency detection and complete the fast, accurate and efficient detection of a complex test object. A controller is controlled to receive the concentration data in an interrupt mode, so no waiting time is required, the parallel implementation of signal acquisition and concentration calculation is realized, and the detection efficiency is improved.

Disclosed is a room temperature ammonia (NH3) sensor based on DPA-Ph-DBPzDCN and gold interdigital electrodes and preparation method therefor, belonging to the technical field of gas sensors. The roomtemperature NH3 sensor is composed of an Al2O3 ceramic plate, gold interdigital electrode bases, and a DPA-Ph-DBPzDCN sensitive material thin film from bottom to top. The preparation method comprisesthe following steps: preparing a DPA-Ph-DBPzDCN sensitive material through Suzuki coupling reaction; separately preparing nickel and gold on the Al2O3 ceramic substrate to prepare interdigital electrodes by sputtering; and preparing the DPA-Ph-DBPzDCN sensitive material on the interdigital electrodes by using a spin coating method. According to the room temperature NH3 sensor based on DPA-Ph-DBPzDCN and gold interdigital electrodes and preparation method therefor, a novel organic material DPA-Ph-DBPzDCN is used as a sensitive material, so that the working temperature of the sensor is effectively reduced, and ammonia gas can be detected at room temperature; and good selectivity and stability are achieved besides a rapid response speed for ammonia gas at room temperature.

The invention belongs to the technologies of electronics, and specifically relates to an in-system programming enabled general-purpose flight parameter collector. Existing products in the field of flight parameters are different in model but roughly the same in function for the purpose of ensuring the uniformity and certainty of technical conditions, and this may thus be unfavorable for mass production and cause troubles for a user during aircraft routine maintenance and troubleshooting. The in-system programming enabled general-purpose flight parameter collector in the invention comprises a host computer module, a power module, a signal conditioning module, and an assembly of signal interface modules for various aircraft types. A ground maintenance device loads onboard configuration related information to a storage area within the flight parameter collector by way of in-system programming to meet the demands of use of different types of aircrafts. A general-purpose design can allow reduction of product categories, effective control of technical conditions, mass production, and also improve the convenience in aircraft routine maintenance and reduce the cost and difficulty of service assurance.

The invention provides a cooling tower scale-inhibition testing apparatus control system of a direct-current valve cooling system. The control system is composed of a programmable logic controller (PLC), a digital quantity input module, a digital quantity output module, an analog quantity input module, an analog quantity output module, an acquisition measuring system, a man-machine interface, and a power supply system. With the system, electromechanical equipment controlling, signal acquisition, data on-line monitoring, fault determination and uploading can be realized; high-stability, high-performance, and high-reliability automatic operation of all electromechanical equipment according to a predetermined logic can be coordinated; real-time signal acquisition like the flow, the pressure, the temperature and the conductivity and the like can be carried out and the signals are uploaded to an upper computer to carry out data archiving; and when one parameter extends the set range, alarming is carried out, so that the tester can be prompted to carry out fault processing timely.

The invention belongs to atmospheric radiation environment monitoring and nuclear facility safety running monitoring systems and methods, and particularly relates to an atmospheric xenon enrichment and purification method and device and a method for preparing a carbon molecular sieve. The atmospheric xenon enrichment and purification method mainly includes the steps of air pretreatment, three-level concentration, separation and purification, sample preparation and online stable xenon detection. M hollow fiber nitrogen-enriched membrane components of the same type and / or different types are connected in series and / or in parallel for separation in the air pretreatment process. The carbon molecular sieve is used as an adsorbent in the step of separation and purification. The problem of low enrichment efficiency of an existing atmospheric xenon enrichment and purification method and device is solved, the quantity of xenon acquired in 24 hours by the system is not smaller than 10mL, xenon volume-by-volume concentration is not lower than 30%, and quantitative uncertainty of stable xenon is less than 10%.

The invention relates to a method for electromagnetically nondestructively detecting metal surface cracks by a multi-frequency exciting field array. The method comprises the following steps: (1) generating a standard defect on the center of a to-be-detected test piece; (2) connecting an exciting apparatus and the to-be-detected test piece, and establishing a detection model; (3) acquiring a component when a coil is excited, extracting a detection signal of each data, performing the empirical mode decomposition by using EMD to obtain an eigenmode functional signal; and (4) according to the component data characteristics, precisely identifying an angle, an axial length, a peripheral length and a radial length of a crack defect, and calculating an actual size of the defect. A U-shaped magnetic yoke wound on an electrification rectangular coil is used for magnetizing the to-be-detected component to excite a defect leakage magnetic field, the disturbance signal of a magnetic field above thedefect can be acquired, the metal surface defect is detected and identified, the reliability of a detection result can be improved, and the application value for the electromagnetic nondestructive detection of the test piece with complicated defect shape is relatively high.

Quantum magneto-optical sensors involve the field of sensors for quantum-level ultra-trace detection of nuclear magnetic resonance and Raman spectroscopy, specifically including the discovery of the electronic energy of specific protons in the detection object under the states of nuclear magnetic magnetization, nuclear magnetic resonance, nuclear magnetic relaxation and nuclear magnetic demagnetization. The difference in distribution probability of Raman scattered light in azimuth and direction caused by the order transition, and finding and adjusting the optimal magneto-optical angle between excitation light and Raman scattered light will obtain higher collection efficiency of Raman scattered light. The characteristic magnetic spectrum and the characteristic spectrum, according to the quantum correlation, can also find out more information from the quantum correlation. Specifically, the main magnetic field generator, the excitation induction coil, the control subsystem, the laser and the Raman probe constitute the quantum magneto-optical sensor. By adjusting the magneto-optical angle in an off-axis or coaxial way, the Raman spectrum collection efficiency can be improved, and at the same time, the correlation between the characteristic magnetic spectrum and the characteristic spectrum in multiple states can be realized, which provides a calculation basis for further analyzing the content of the detected molecules.

The invention relates to a micro fluidic device for CTCs selecting and gathering and unicell analysis, belongs to the technical field of micro fluidic chip detection, and aims at solving the technicalproblem that CTC phenotype analysis is difficult in clinic application due to factors including low cell concentration in CTCs, large cell phenotype difference, low unicell analysis flux and nonsystematic automation in a sample. According to the micro fluidic chip device for rapid CTCs selection and high-flux unicell analysis, a spiral chip and micro-column array lateral flow chip are used to complete selecting and gathering of tumor cells, and the micro-column array chip carries out phenotype analysis detection after EpCAM and N-cad marking,. All operations for CTCs are implemented in a micro-nano scale platform CTCs loss is reduced to largest degree, the method has the advantages of high integrated degree, high flux, convenient operation integration and automation, and the method can beapplied to liquid biopsy in clinics conveniently, rapidly and easily.

The invention discloses a quantum magneto-optical sensor, and relates to the field of quantum-level ultra-micro detection sensors of nuclear magnetic resonance and Raman spectrum, in particular to a quantum magneto-optical sensor in states of nuclear magnetic magnetization, nuclear magnetic resonance, nuclear magnetic relaxation and nuclear magnetic non-magnetization. According to the method, the distribution probability difference of Raman scattering light in orientation and direction caused by electron level transition of specific protons in an object is detected, the optimal magneto-optical included angle of exciting light and the Raman scattering light is searched and adjusted, higher Raman scattering light collection efficiency is obtained, a characteristic magnetic spectrum and a characteristic spectrum are collected at the same time, and according to quantum correlation, the Raman scattering light collection efficiency is improved. More information can be found out from quantum correlation, specifically, a quantum magneto-optical sensor is composed of a main magnetic field generator, an excitation induction coil, a control subsystem, a laser and a Raman probe, the magneto-optical included angle is adjusted in an off-axis mode or a coaxial mode, the Raman spectrum collection efficiency is improved, and the detection accuracy is improved. Meanwhile, association of the characteristic magnetic spectrum and the characteristic spectrum in multiple states is realized, and a calculation basis is provided for further analyzing and detecting the content of molecules.

The invention relates to a rubbish transfer station rubbish treatment system and a rubbish decrement method adopting the same, and belongs to the technical field of environmental protection. The rubbish transfer station rubbish treatment system comprises a vacuum pump arranged in a rubbish transfer station, a leachate collecting tank, a rubbish compressor provided with a compression head and a rubbish compression box which can be conveyed into and out of the rubbish transfer station by a vehicle, a gas suction pipeline communicates between one end of the leachate collecting tank and the vacuumpump, the other end of the leachate collecting tank communicates with a water suction pipeline, an inlet and an outlet which can be opened and closed are formed in the rubbish compression box, a water outlet located at the bottom of the rubbish compression box is formed in the rubbish compression box, the water outlet communicates with the rubbish compression box and the water suction pipeline, and the water outlet and the water suction pipeline are connected and fixed through a butt joint. According to the rubbish transfer station rubbish treatment system and the rubbish decrement method adopting the same, the rubbish of the rubbish transfer station can be efficiently and quickly treated, and the rubbish leachate can be prevented from polluting rubbish compression equipment and the surrounding environment.

The invention discloses an electronic shift lever circuit of a manual adjustment and automatic adjustment integrated gearbox. The electronic shift lever circuit comprises a vehicle-mounted direct-current power source feedback circuit unit, a P-gear acquisition circuit unit, a lock control signal acquisition circuit unit, a gear indicting circuit unit, a processor unit, an ESD protective circuit unit, an LIN transceiver unit, an LIN signal filtering unit and a power source unit. The five output ends of the processor unit are connected with the control ends of controllable switching circuit units of a P-gear driving circuit unit, an R-gear driving circuit unit, a N-gear driving circuit unit, a D-gear driving circuit unit and a M-gear driving circuit unit correspondingly through the ESD protective circuit unit; and the vehicle-mounted direct-current power source feedback circuit unit, the P-gear acquisition circuit unit and the lock control signal acquisition circuit unit are connected with the input end of the processor unit through the ESD protective circuit unit, the data end of the processor unit is connected with the RXD end and the TXD end of the LIN transceiver unit, and the LIN end of the LIN transceiver unit is connected with the LIN signal filtering unit and used for being connected with a controller of the gearbox.

The invention discloses an ultra wide band imaging semi-physical simulation testing method and an ultra wide band imaging semi-physical simulation testing system based on a digital oscilloscope. The system comprises a testing plate, an oscilloscope and an upper computer, wherein a signal transmitting device, a signal receiving device, a transmitting antenna and a receiving antenna are integrated on the testing plate; a signal source transmits a signal to the signal transmitting device; the signal transmitting device respectively transmits the signal to the transmitting antenna and the signal receiving device; the receiving antenna receives the signal which is transmitted by the transmitting antenna and then reflected back by an object to be tested; the receiving antenna transmits the signal to the signal receiving device; the signal receiving device is connected with the oscilloscope; and the oscilloscope communicates with the upper computer. According to the invention, the manual operation frequency of the oscilloscope is reduced, the abrasion of the oscilloscope is reduced, a new signal processing algorithm and an imaging computing function can be flexibly added, and the analysis testing efficiency of the algorithm and the device is improved.

The invention discloses an overhead line partial discharge positioning device and method based on an ultrasonic array. By means of the ultrasonic sensor array, ultrasonic signals of the same ultrasonic signal source at multiple sensor positions can be collected, and then subsequent analysis can be conducted according to the positions of different sensors and the strength of the collected ultrasonic signals, so that the positioning purpose is achieved. The device comprises an ultrasonic sensor, an ultrasonic detection conditioning filtering shaping circuit, an analog-to-digital conversion circuit and an ARM processor. When the device works, the ultrasonic array surface on the ground is arranged towards the overhead line, eight ultrasonic sensors on the device can collect ultrasonic signalsof partial discharge in the overhead line. Through a multiplexing scheme, sixteen times of acquisition at the same position are realized, the acquired ultrasonic signals are subjected to characteristic frequency selection, filtering and shaping of a subsequent conditioning circuit to obtain the ultrasonic signal intensity at each ultrasonic sensor, and the data information can be subjected to numerical calculation through an ARM, so that the position of the partial discharge ultrasonic source is obtained through analysis.

The invention discloses a multifunctional wire collector and an underwater stealth device, comprising a wire collection tube (5), an integrated battery (2) and a circuit board (7). The wire collectiontube (5) is used to releasing and collecting cables. The two ends of the wire collection tube (5) are supported through a wire coiling support. The integrated battery (2) is arranged in the wire collection tube (5). The integrated battery (2) is connected with an externally applied device through the cable. The circuit board (7) is arranged on the wire collection tube (5) and comprises a communication unit capable of receiving wireless signals. The communication unit is connected with the externally applied device through the cable. The direct integration of the battery with the wire collection tube and the increase of the circuit board with a communication module not only make the wire collection device carried and used conveniently but also realize the signal acquisition, image transmission and signal transmission through the communication module of the circuit board. Therefore, connection with an intelligent terminal can be realized, and the functions of the wire collection deviceare enlarged.

The invention discloses an optical cable fiber core optical signal acquisition device, resource detection equipment and a platform. The optical cable fiber core optical signal acquisition device is provided with the beam splitter, so that bidirectional optical signals in an optical fiber path can be acquired under the condition that optical path loss is not increased basically, and signal acquisition in the optical fiber path is realized. Through arranging the optical cable fiber core resource detection device, optical signal acquisition and identification in an optical fiber path are realized, and the optical signals can be transmitted to a network through the communication device. By arranging the detection plate, the connection state of the optical fiber, the quality of an optical fiberpath and an optical fiber damage point can be directly detected. The problems that optical cable fiber cores are occupied or in an idle state, and the idle fiber core connection relation in adjacentoptical cables cannot be detected are solved. Unified management of optical fiber resources of the whole network is realized by arranging an optical cable fiber core resource detection platform. The complexity of optical network maintenance is reduced. The technical problems that light path resources are wasted and cannot be managed in a unified mode are solved.

The invention relates to the technical field of data acquisition and transmission, and provides a multichannel signal acquisition technical scheme to realize signal acquisition and processing. Therefore, the technical scheme adopted by the invention is as follows: a multichannel signal acquisition system based on VPX architecture comprises a radio frequency receiving channel module, a digital acquisition module and an antenna, the radio frequency receiving channel module receives a radio frequency signal from the antenna and completes filtering, amplification and frequency conversion of the signal; the processed intermediate frequency signal is output to the digital acquisition module for subsequent processing; and the digital acquisition module completes intermediate frequency signal acquisition, signal processing, interface transmission and external control. The system is mainly applied to data acquisition and transmission occasions.

The invention discloses a keyboard dot matrix signal acquisition device based on PLC, which includes a keyboard and a programmable logic controller PLC, and each key signal output interface is respectively connected to at least two different input terminals on the programmable logic controller PLC , the corresponding relationship between each key signal output interface and the connection of the input terminal on the PLC is not the same. In the present invention, each key signal output interface of the keyboard dot matrix is ​​connected with two different input terminals on the programmable logic controller PLC respectively, and the PLC only needs a few input terminals, and multiple output ports of the keyboard dot matrix can be connected to each other. The interface is completely separated to realize the signal acquisition of the keyboard dot matrix. Since the PLC directly detects the input terminal, there is no need to set up an intermediate link of signal transmission such as a single-chip microcomputer, which can effectively avoid signal interference and loss caused by the communication between the single-chip microcomputer and PLC, improve the real-time performance of signal transmission, and effectively reduce costs.

The invention discloses a distributed fiber bragg grating sensor measurement and control system. The FPGA is connected with the super-radiation light-emitting diode through the super-radiation light-emitting diode driving circuit, the FPGA is connected with the semiconductor chilling plates through the chilling plate driving circuit, the FPGA is connected with the semiconductor chilling plates through the chilling plate driving circuit, and the two semiconductor chilling plates are arranged on the super-radiation light-emitting diode and the array waveguide grating demodulation chip. The array waveguide grating demodulation chip is connected with the FPGA through the low-noise current and voltage conversion circuit; the super-radiation light-emitting diode emits light to the distributed fiber bragg grating sensor, and a light signal is reflected and enters the array waveguide grating demodulation chip. According to the invention, the signal-to-noise ratio is improved by changing the current / voltage conversion gain of the trans-impedance amplifier, the acquisition of the voltage signal is realized through the FPGA differential pin, the application complexity of the circuit is reduced without the help of an external voltage conversion chip, and the accuracy of the optical power ratio of adjacent channels is improved.

The invention discloses a super-multichannel embedded high-speed signal acquisition and processing system and method. The system comprises an upper host; a switch in communication connection with theupper host; a plurality of transmission processing units in communication connection with the switch; multiple acquisition control units, wherein each acquisition control unit comprises a plurality ofADC acquisition channels, a plurality of conditioning circuits and a first FPGA, the conditioning circuits being in communication connection with the ADC acquisition channels and being in one-to-onecorrespondence with the ADC acquisition channels, the ADC acquisition channels being in communication connection with the first FPGA, and the first FPGA being electrically connected with the transmission processing unit through a multi-channel SPI bus; and a plurality of sensor modules, at least one sensor module being electrically connected with one conditioning circuit, and the first FPGA beingin communication connection with the sensor modules. The problems that in an existing signal collecting and processing system, the number of collecting channels is small, and a large signal collectingsystem is not easy to form are solved, and the problems that an existing signal collecting and processing method cannot achieve variable delay collection among multiple collecting channels and largedata volume real-time processing are solved.

The invention relates to the technical field of signal control and provides a signal collecting and driving testing device. The testing device comprises a control terminal, a signal collecting card, a signal driving card, a relay collecting late, a relay driving plate and a guide rail type AC-DC (Alternating Current-Direct Current) power source. In the technical scheme of the invention, a relay dry node manner is adopted for ensuring the polarity of a switching value signal between tested equipment and testing equipment and / or power not to be limited by an opposite side; a relay input-output manner is adopted for realizing the electrical isolation between the tested equipment the testing equipment; in addition, by using a filter circuit, the microsecond-level signal collection is realized and is not affected by a microsecond-level pulse interference signal; and finally the amount of collecting and driving switching value signals of the signal collecting and driving testing device can be freely adjusted and configured; and the signal collecting and driving testing device can simulate gravity type relay equipment of a railway system and is small in volume and flexible to realize.

The invention relates to the technical field of engines and discloses an engine detonation signal processing method and device and an engine. The engine detonation signal processing method comprises the steps that a detonation signal is collected; the collected detonation signal is subjected to a first stage low-pass filtering; the detonation signal after the first stage low-pass filtering is converted to a digital signal, and second stage low-pass filtering is carried out; the detonation signal after the second stage low-pass filtering is subjected to band-pass filtering; and the detonation signal after the band-pass filtering is subjected to integration, and a energy value representing the strength of detonation in an air cylinder is obtained. According to the engine detonation signal processing method, the mode that the two-stage low-pass filtering and the first stage band-pass filtering are matched is adopted to process the detonation signal, the effect of removing interference is better, and the detonation signal is restored to a greater extent.

The invention provides an intelligent signal isolator, belongs to the technical field of signal isolators and aims at providing a signal isolator digitally adjustable in gain and zero and high in reliability and transmission rate. According to the adopted technical scheme, the intelligent signal isolator comprises a first CPU module, a second CPU module, an A / D conversion module, a D / A conversion module, a transformer isolation communication module and a power supply module, wherein a signal input port of the first CPU module is connected with a signal output port of the A / D conversion module, a signal output port of the first CPU module is connected with the signal input end of the transformer isolation communication module, the signal output end of the transformer isolation communication module is connected with a signal input port of the second CPU module, and a signal output port of the second CPU module is connected with a signal input port of the D / A conversion module. The intelligent signal isolator is suitable for various signal isolation occasions.

The invention belongs to atmospheric radiation environment monitoring and nuclear facility safety running monitoring systems and methods, and particularly relates to an atmospheric xenon enrichment and purification method and device and a method for preparing a carbon molecular sieve. The atmospheric xenon enrichment and purification method mainly includes the steps of air pretreatment, three-level concentration, separation and purification, sample preparation and online stable xenon detection. M hollow fiber nitrogen-enriched membrane components of the same type and / or different types are connected in series and / or in parallel for separation in the air pretreatment process. The carbon molecular sieve is used as an adsorbent in the step of separation and purification. The problem of low enrichment efficiency of an existing atmospheric xenon enrichment and purification method and device is solved, the quantity of xenon acquired in 24 hours by the system is not smaller than 10mL, xenon volume-by-volume concentration is not lower than 30%, and quantitative uncertainty of stable xenon is less than 10%.

The invention discloses a device and method for judging the rotation phase position and the real-time position of an engine crankshaft. The device comprises an engine cylinder head, a camshaft, a housing fixing bolt, a target disc, a target disc fixing bolt, a housing, a photoelectric sensor, a photoelectric sensor fixing bolt, a single chip and a connecting wire. The target disc is provided with an outer edge gap and three concentric gap ring belts. 180 single gaps are uniformly distributed in the outer-circle gap ring belt, 60 double-gaps are uniformly distributed in the middle-circle gap ring belt, and 60 single gaps are uniformly distributed in the inner-circle gap ring belt. A light emitter and a light receiver are respectively arranged on the two sides of each of the concentric gap ring belt and the outer edge gap. According to the change of output signals of the light receiver group, when the target disc rotates along with the camshaft, the directions of clockwise rotation and counterclockwise rotation of an engine are judged and the real-time phase position of the crankshaft is calculated. The device and the method can achieve precise judging to the directions of clockwise rotation and counterclockwise rotation and the phase position of the crankshaft in real time and can measure the rotation speed of the engine.

A multi-frequency excitation field array electromagnetic non-destructive detection method for metal surface cracks, the method: 1) generate a standard defect at the center of the test piece; 2) connect the excitation device with the test piece to build a detection model; 3) The component is collected while the coil is excited, the detection signal of each data is extracted, and the EMD is used for empirical mode decomposition to obtain the intrinsic mode function signal; 4) According to the characteristics of the component data, the angle and axial direction of the crack defect are realized Accurate identification of length, circumferential length and radial length, and then convert the actual size of the defect; the invention uses a U-shaped yoke wound with a energized rectangular coil to excite the leakage magnetic field of the defect to realize the magnetic field disturbance above the defect. Signal collection, detection and identification of metal surface defects, improve the reliability of detection results, and have strong use value for electromagnetic nondestructive testing of specimens with complex defect shapes.

The invention relates to an information processing, integration, and development platform of a sensor, which comprises a sensor signal processing device and a computer which are mutually connected, wherein the sensor signal processing device comprises a power module, a plurality of signal processing board cards used for the processing of complex signals, and a plurality of simulator modules used for providing different simulation downloads for the different signal processing board cards; the power module is used for providing power source for the signal processing board cards and the simulator modules; the plurality of signal processing board cards are connected with the plurality of simulator modules in the one-to-one correspondence; the sensor signal processing device also comprises a signal collection card used for collecting sensor input data, and a transmission module used for transmitting the sensor input data and multi-way signal processing board card processing result. The platform can realize functions of information collection, processing, and the like of the sensor, and is more close to a true processing environment.

The invention discloses a double-bridge-structure based magnetic bearing electromagnetic pole magnetic force control circuit. A main circuit with a double-bridge structure is adopted, wherein the main circuit comprises two power switch devices and two diodes: a first power switch device (Q1), a second power switch device (Q2), a first diode (D1) and a second diode (D2); the first power switch device and the second diode form a first bridge arm; and the second power switch device and the first diode form a second bridge arm. The double-bridge-structure based magnetic bearing electromagnetic pole magnetic force control circuit is high in safety, low in loss, and low in magnetic force pulsation amplitude.