30results about How to "Avoid signal distortion" patented technology

The invention relates to a transient electromagnetic signal denoising method based on self-adaptive fuzzy optimization singular spectrum analysis (SSA), which aims at denoising transient electromagnetic signals, and comprises the following specific steps of: 1, decomposing a noisy signal into a plurality of modes through a complementary ensemble empirical mode decomposition (CEEMD) method; and according to the sample entropy, classifying the modals into a signal-dominant category and a noise-dominant category. 2, taking a signal fuzzy entropy (FE) as a target function of each modal optimization, obtaining a strict boundary of each modal SSA reconstruction order by using a particle swarm optimization (PSO) algorithm, and taking a singular value in the strict boundary as a signal component; thirdly, solving loose boundaries of each modal reconstruction order through a singular value spectrum and a singular value difference spectrum, and generating a fuzzy interval by combining the loose boundaries with the strict boundaries; and 4, obtaining the membership degree of the singular value belonging to the signal or noise component in the fuzzy interval through a weighted fuzzy noise clustering algorithm (WFNC), and carrying out signal component reconstruction by taking the membership degree as a weight. And finally, adaptive reconstruction of each mode is carried out on the signal components by using an SSA method, and a de-noised signal is obtained through mode summation. According to the method, a low-signal-to-noise-ratio adaptive singular spectrum analysis denoising method is provided, the problem of wrong singular value selection in the reconstruction process is avoided, and the signal-to-noise ratio is effectively improved.

This invention discloses a dielectric ceramic substrate material with a negative capacitance temperature coefficient, its preparation method, and its application, relating to the field of functional ceramics technology. It comprises, by mass percentage, 76wt%~93.5wt% CaTiO. 3 2wt%~15.5wt% SrTiO 3 1wt%~8.5wt% MgTiO 3 The ceramic substrate material contains 1.5wt%~3.2wt% modifier and 2wt%~4.5wt% cooling agent. It possesses excellent flexural strength, good surface roughness, and bonding strength, making it suitable for fabricating miniaturized chip-type microwave monolayer ceramic capacitors with low dielectric loss. It exhibits a negative temperature coefficient of capacitance (-(1500±500)ppm / ℃, (-55~125)℃), which can compensate for capacitance drift caused by temperature changes and prevent signal distortion. Furthermore, it is flat, non-deformable, and has good rectangularity, exhibiting excellent surface properties.

The utility model provides an automatic deviation rectifying and unwinding device for a reticulated film base material, which belongs to the field of film base material unwinding devices and comprises a base, a support plate and an outer cover are arranged above the base, the top of the support plate is fixedly connected with a vertical frame, the side wall of the outer cover is rotatably connected with an air expansion shaft, and a coiled material is sleeved on the air expansion shaft. The side wall of the outer cover is rotationally connected with a deviation rectifying shaft, a transmission shaft and an auxiliary shaft, the outer side wall of the outer cover is fixedly connected with a sensor, the sensor is arranged between the deviation rectifying shaft and the auxiliary shaft, the inner side wall of the outer cover is fixedly connected with a motor, and the transmission shaft penetrates through the end of the outer cover and is in transmission connection with an output shaft of the motor through a first belt. The inner side wall of the outer cover is rotationally connected with a rotating shaft, the rotating shaft is in transmission connection with an output shaft of the motor through a second belt, an air injection assembly is arranged in the outer cover, air in the air storage pipe is extruded to be sprayed out and blown to a probe of the sensor, and signal distortion caused by the fact that the sensor is shielded by foreign matter is prevented.

The application relates to a high-resolution processing method of borehole radar data based on mixed time-frequency analysis, which comprises the following steps: constructing discrete frequencies based on the scale resolution of borehole radar data; performing Hilbert transform on the borehole radar data to generate an analytical signal; filtering the signal, reconstructing the signal, and then obtaining weighted energy of different frequency bands, and finally outputting data processed by high-resolution processing. The application realizes dynamic weighting through low-frequency and high-frequency weighting factors, flexibly enhances or suppresses low-frequency / high-frequency components; through envelope normalization, pulse noise is suppressed, and the signal-to-noise ratio is improved; through conjugate symmetric padding, the original phase information is preserved when filtering in the frequency domain, signal distortion is avoided, and the time positioning accuracy can be maintained in time-frequency analysis; through different frequency band energy weighting processing, high and low frequency joint analysis is realized, the high and low frequencies are simultaneously widened, and high-resolution amplitude-preserving processing is realized.

The utility model discloses a xenon lamp array cooling system and a laser inertial confinement fusion device thereof, which belong to the xenon lamp technology and comprise a lamp array component, a fan, an optical fiber temperature sensor and temperature monitoring software. The LED lamp is characterized in that the lamp array assembly comprises a xenon lamp, a reflecting surface, a cover plate and an air guide channel. The xenon lamp is installed and placed in the lamp array, xenon lamp installation holes are formed in the lamp array assembly, the air guide channels are arranged on the two sides of the lamp array, the draught fan is a powerful blowing air blower, and the optical fiber temperature sensor is used for monitoring the temperature change of a lamp array cover plate. The monitoring software can monitor the variation trend of the temperature of the lamp array in real time. The xenon lamp array cooling system effectively reduces the temperature of the lamp array in a short time, monitors the temperature change of the lamp array, and provides guarantee for reliable and stable operation of the lamp array.

The utility model discloses a device for leading out a cathode nuclear signal of a proportional counter tube, and belongs to the technical field of nuclear detection. In order to solve the technical problem that the measurement precision is influenced by signal distortion easily caused by leading out nuclear signals from the anode of the existing proportional counter tube, the utility model mainly adopts a mode of leading out nuclear signals from the cathode of the proportional counter tube, and is provided with a first signal joint, a second signal joint, a third signal joint and a metal shielding shell in a matched manner. According to the utility model, complete output and electromagnetic interference suppression of nuclear signals can be realized, and signal quality and device stability are improved.

This invention discloses a 25Gbps transimpedance amplifier with current compensation to improve overload performance. The current compensation circuit (CMP) is part of the 25Gbps transimpedance amplifier. The main link of the transimpedance amplifier consists of a core amplifier (Tia_core), a single-ended to differential amplifier (S2D), an output buffer, an automatic gain control (AGC) circuit, the current compensation circuit (CMP), and a mirror transimpedance amplifier (Dummy_tia) module. The input current signal is converted into a single-ended voltage signal by the core amplifier (Tia_core), and then the single-ended to differential amplifier (S2D) converts the single-ended signal voltage into a differential voltage. The output buffer transmits this differential signal to the next stage chip, ensuring impedance matching during transmission. The automatic gain control (AGC) circuit automatically adjusts the gain of the core amplifier (Tia_core) circuit according to the input current amplitude. The current compensation circuit (CMP) included in this invention can effectively prevent the transimpedance amplifier link from over-saturating and causing signal distortion when the input current signal is a large signal at the mA level, thus significantly improving the overload performance of the transimpedance amplifier.

This invention discloses an inertia-adjustable grid-connected device and control method for reducing motor-to-ground voltage. The device comprises an even number of motor grid-connected interface devices connected in series between the positive and negative buses of a bipolar DC-DC converter. The intermediate node of each even number of motor grid-connected interface devices is grounded to reduce the motor-to-ground voltage. Each motor grid-connected interface device includes a doubly-fed induction generator (DFIG), a first DC / AC converter, a permanent magnet synchronous motor (PMSM), and a second DC / AC converter. The positive terminal of each motor grid-connected interface device is connected to the positive DC side of both the first and second DC / AC converters, and the negative terminal is connected to the negative DC side of both the first and second DC / AC converters. This invention aims to reduce the ground voltage of both the DFIG and PMSM, lower insulation requirements, extend insulation life, and improve the stability and reliability of the electrical system.

The invention relates to a skin impedance detection circuit and radio frequency treatment equipment, and the circuit comprises a detection electrode module which is used for making contact with human skin to form a current detection loop; the differential current acquisition circuit is connected in series in the current detection loop and is configured to convert the excitation current flowing through the detection electrode module into a differential voltage signal; the amplifying circuit capable of digitally controlling gain is connected to the output end of the differential current acquisition circuit and is configured to receive the differential voltage signal, switch gain gears according to a digital control signal and output an amplified analog signal; and the main control module is connected to the amplifying circuit capable of digitally controlling the gain, and is configured to collect the amplified analog signal, calculate a skin impedance value by combining the current gain gear and the known excitation parameter, and generate an equipment control instruction according to the skin impedance value. The skin impedance detection circuit can detect impedance in real time and set a safety threshold value, and when the impedance exceeds a normal range, the equipment can immediately pause output or reduce power.

The invention discloses a hydrogen damage test device and a detection method thereof.The hydrogen damage test device comprises an electrolyte container, an electrochemical workstation, an acoustic emission probe, an acoustic emission detector and a computer, and a metal sample, an auxiliary electrode and electrolyte are arranged in the electrolyte container; the metal sample and the auxiliary electrode are soaked in the electrolyte and are both connected with the electrochemical workstation, the non-hydrogen-filling surface of the metal sample is provided with the acoustic emission probe, the other surfaces of the metal sample except the hydrogen filling surface are sealed through resin, the acoustic emission probe is connected with the acoustic emission detector, and the electrochemical workstation and the acoustic emission detector are both connected with the computer. According to the method, acoustic emission signals are collected in real time in the electrochemical hydrogen charging process, synchronous analysis is conducted in combination with parameters of the hydrogen charging process, elastic wave signals generated by a local damage event can be captured at the moment of hydrogen-induced microcrack initiation, and therefore real-time recognition of the hydrogen crack initiation moment is achieved; and the accuracy and reliability of hydrogen damage early recognition are improved.

The utility model relates to the technical field of automobile connectors, in particular to an anti-seismic shielding automobile connector structure. According to the technical scheme, the connector comprises a first connecting piece and a second connecting piece, the connecting portion of the first connecting piece and the connecting portion of the second connecting piece are provided with a connecting end and a contact end respectively, and a first shielding layer and a second shielding layer are arranged between the connecting end and the contact end and used for shielding electromagnetism; a fastening connecting part used for assisting fastening connection of the first connecting piece and the second connecting piece is further arranged between the first connecting piece and the second connecting piece. The fastening connecting part comprises a connecting arm connected with the upper surface of the second connecting piece and a second hook clamping head connected with one side of the first connecting piece. According to the utility model, high-efficiency electromagnetic shielding is realized, shock resistance is realized by means of an elastic assembly and a hook clamping structure in the fastening connection part, and signal transmission stability and connection reliability are guaranteed in an omnibearing manner by means of cooperative fastening connection of multiple components in the fastening connection part.

The application belongs to the technical field of signal transmission, and discloses a method for eliminating analog signal transmission error through digital compensation, which specifically comprises the following steps: in addition to the original signal transmitting circuit part, a signal detecting part composed of MCU, ADC and a communication module is arranged at the signal transmitting end; a signal detecting part composed of MCU and ADC communication module and a control part capable of controlling the signal at the output end to be offset and gain varied are arranged at the signal receiving end; the signal at the receiving end is collected by the MCU to compare with the data of the transmitting end communication module, and the difference between the two data is calculated to obtain the correction value of the amplitude and offset; the gain and offset of the signal are changed by controlling the offset and gain circuit part at the receiving end, so that the transmission error is eliminated, and the gain and offset control method is realized by using DAC, PGA and other components; the deviation of the frequency response can also be calculated according to the requirement, and is corrected by the gain and offset control circuit part.

The invention relates to the technical field of analog integrated circuits, in particular to a high-precision temperature sensor temperature-sensing front-end circuit based on a chopping technology, and aims to solve the problems of low-frequency 1 / f noise, operational amplifier input offset voltage drift, band-gap reference temperature drift, limited output driving capability and the like existing at the front end of a traditional temperature sensor. The front-end circuit comprises a chopping band-gap reference source circuit, a chopping buffer circuit and a two-phase non-overlapping clock generation circuit, wherein the chopping band-gap reference source circuit adopts a parasitic bipolar PNP transistor with an emitter junction area ratio of 8: 1 as a temperature sensing device, and a high-gain chopping folded cascode operational amplifier is embedded in the chopping band-gap reference source circuit; and stable positive temperature coefficient voltage and low-temperature drift reference voltage are generated. Noise and maladjustment are inhibited from the system architecture level, the temperature measurement precision can reach the sub-degree centigrade level, the loading capacity is high, the method is achieved based on the standard CMOS technology, a special technology and complex temperature calibration are not needed, and the method has the advantages of being low in cost, high in stability and large-scale integration.

The application provides an integrated quantum bit output link and relates to the technical field of input / output device links. The application aims to solve the problem that the space is limited during quantum bit transmission, and efficient heat treatment is difficult to achieve. The integrated quantum bit output link comprises three circulators, a load, a Josephson parametric amplifier and a connector. The load is arranged on the three circulators and is used for absorbing reverse transmission signals. The Josephson parametric amplifier is internally provided with the connector, and the Josephson parametric amplifier is connected with the three circulators through the connector. The integrated quantum bit output link can maintain good performance in a super low temperature environment, achieves the effects of high integration, high heat conduction and magnetic shielding, is easy to assemble and mass-produced, and effectively reduces the volume of the integrated quantum bit output link.

The utility model relates to mechanical detection technical field especially relates to a kind of probe mounting bracket for shaft body vibration detection, it includes the rotating shaft body to be measured and the bearing bush surrounded in rotating shaft body, the side surface of bearing bush is fixed with two mounting brackets, each the mounting bracket is fixed with one vibration probe, the vibration probe is perpendicular to the circumferential surface of rotating shaft body and is close not contact, the axis of two the vibration probe is perpendicular to each other.The utility model is fixed with bearing bush and is not loose and moves under vibration as the mounting bracket of vibration probe installation base, the axis of two vibration probes after installation coincides with the radial of rotating shaft body, and two the vibration probe is perpendicular to each other, so that the two measuring points on the rotating shaft body checked are also perpendicular to each other, to improve vibration detection accuracy.

The invention discloses an instantaneous power control method for a permanent magnet synchronous generator without a position sensor. A direct current power supply system comprises a permanent magnet synchronous motor, a power electronic converter and a control framework. The permanent magnet synchronous motor works in a power generation state, the rotor is driven to rotate through the engine or the transmission device connected to the engine, the stator winding cuts a magnetic field generated by the rotor permanent magnet, and then alternating electromotive force is induced in the stator winding. The control architecture controls the power electronic converter to work in a rectification state and provides stable voltage output for the load. According to the control method provided by the invention, the sliding-mode observer, the phase-locked loop and instantaneous power control are combined, and non-inductive observation of the rotor position and decoupling control of active power and reactive power are realized. Moreover, the size of the permanent magnet synchronous generator is reduced, the problem of signal failure easily occurring under the severe working conditions of vibration, high temperature and the like is effectively avoided, and the reliability of long-term operation of the system is improved.

The invention relates to the technical field of railway communication monitoring, provides a remote monitoring and environment control method and device of a GSM-R system, and solves the problems of low intelligent level and poor security response efficiency of environment monitoring of a railway communication base station. The method comprises the following steps: collecting original signals and event data of each sensor in a base station environment where the system is located; performing optical coupling isolation on the digital signal to generate first pre-processing data, and performing program control amplification on the analog signal to generate second pre-processing data; fusing the two types of data and the event data into a monitoring data set; mining an abnormal mode set from the data set by using a time sequence mode mining algorithm; constructing an event inference graph based on the set, calculating a threat evaluation value by analyzing an event association relationship, and generating a corresponding security strategy when the threat evaluation value exceeds a threshold value; and packaging the strategy instruction into a special protocol data packet, issuing the special protocol data packet to a base station environment controller, and coordinating execution equipment. According to the invention, the intelligent level and security response efficiency of railway communication base station environment monitoring are improved.

This application discloses an audio processing method, device, and storage medium, belonging to the audio field. The method includes: filtering the left and right channel signals of the original audio using a first low-pass filter to obtain low-frequency left and right channel signals; the first low-pass filter is a finite impulse response low-pass filter with minimum phase property; filtering the left and right channel signals of the original audio using a first high-pass filter to obtain high-frequency left and right channel signals; and mixing the high-frequency left and right channel signals with the low-frequency left and right channel signals after sound field adjustment to obtain a stereo output signal. This solution achieves flexible sound field adjustment while completely solving the problem of blurred sound image positioning caused by nonlinear phase distortion in traditional solutions, as well as the problem of auditory imbalance caused by changes in low-frequency energy distribution, thereby achieving a high-fidelity and high-reproducibility stereo sound field processing effect.

A display temperature control circuit, a display temperature control method and a display device, the display temperature control circuit comprising a first power supply, a heating module, a shunt module, a detection module and a controller, the heating module being electrically connected with the first power supply and used for increasing the temperature of a circuit board; the shunt module being electrically connected with the first power supply and being arranged in parallel with the heating module; the detection module being used for detecting the temperature of the heating module; the controller being electrically connected with the detection module and the shunt module, and being used for controlling the shunt module to be connected or disconnected according to the temperature detected by the detection module, so that the temperature of the heating module is in a preset range. In a low-temperature or high-humidity environment, the heating module of the display temperature control circuit can heat and bake the circuit board, so that the circuit board can work normally; at the same time, the display temperature control circuit can control the temperature of the heating module to be in the preset range by connecting or disconnecting the shunt module, so that the temperature of the heating module is prevented from being too high, and a suitable working environment can be continuously provided for the circuit board.

The application provides a countermeasure method and system for a black flying unmanned aerial vehicle. The method comprises the following steps: detecting remote control link signals of all black flying unmanned aerial vehicles in the vicinity in real time, extracting signal characteristics of each remote control link signal, and constructing a time-frequency countermeasure interval corresponding to each remote control link signal. Since the signal characteristics include a time-frequency range corresponding to the remote control link signal, each time-frequency countermeasure interval strictly matches the time-frequency range of the corresponding remote control link signal and only covers the target remote control link signal area, without expanding the interference range outwardly and generating additional incidental interference, thereby greatly improving the pertinence of the radio frequency interference signal in attacking the remote control link of the black flying unmanned aerial vehicle and effectively suppressing the interference of the radio frequency interference signal on the surrounding legal equipment. Meanwhile, attacking the remote control link of the black flying unmanned aerial vehicle not only greatly improves the countermeasure efficiency on the black flying unmanned aerial vehicle, but also further reduces the interference on the surrounding legal equipment.

The application discloses a kind of digital signal self-regulation and switching path optimization system, including signal feature perception unit, modulation coding decision unit, path state monitoring unit, path optimization decision unit, signal transmission execution unit and feedback closed-loop correction unit.Signal feature perception unit acquires digital signal multidimensional basic parameter and is converted into feature vector;Modulation coding decision unit is based on adaptive modulation and coding algorithm, and modulation coding mode is selected according to feature vector;Path state monitoring unit monitors the multidimensional parameter of transmission path and constructs correlation matrix, and path optimization decision unit utilizes multi-path optimization model to evaluate path and output selection instruction;Signal transmission execution unit handles and transmits signal according to instruction;Feedback closed-loop correction unit compares parameter before and after transmission, and deviation data is fed back to optimize subsequent processing.The system realizes adaptive modulation coding and transmission path dynamic optimization of digital signal, and improves transmission efficiency and stability.

The utility model provides a real-time compensation circuit applied to a signal generating device, and belongs to the technical field of voltage phase compensation. Comprising an operation conditioning circuit, a signal processing unit, an output conditioning circuit and a phase detection circuit, the phase detection circuit compares an AC voltage signal with a following signal through a comparator to obtain a phase signal, and feeds back the phase signal to the signal processing unit; the signal processing unit generates a control signal and feeds back the control signal to the operation conditioning circuit; the operation conditioning circuit comprises a phase compensation circuit and a voltage amplification circuit, and the phase compensation circuit comprises multiple stages of analog switches which are connected in parallel. The phase compensation circuit controls the analog switch to be switched on according to the phase deviation calculated by the signal processing unit, so that different capacitors are connected to the circuit, input and output signals are ensured to be consistent in phase, and phase compensation is realized.

This invention relates to a BeiDou and mobile communication fusion positioning system based on frequency division mixing (FDM), belonging to the field of BeiDou positioning and mobile communication fusion technology. The system includes a BeiDou multi-channel signal generation unit, a signal combining unit, a mobile communication transmission unit, and a BeiDou signal conversion unit, with each unit operating sequentially. The BeiDou multi-channel signal generation unit generates BeiDou frequency domain diversity combined signals or BeiDou time-division frequency domain diversity signals based on the frequency division isolation principle. The signal combining unit preprocesses and combines or directly transmits the signals. The mobile communication transmission unit enables the shared network transmission of BeiDou signals and mobile communication signals. The BeiDou signal conversion unit generates BeiDou positioning signals through filtering, mixing, and other processing. This invention relies on the core technology of frequency division mixing to enable BeiDou signals to share the transmission network with existing indoor communication distribution systems, adapting to enclosed scenarios such as parking lots, utility tunnels, and underground tunnels. It features a simple structure, strong coordination, and allows for seamless terminal access for positioning and navigation.

This invention provides a via inspection method, apparatus, tool, electronic device, and readable storage medium. The via inspection method includes: acquiring the design file corresponding to the printed circuit board (PCB); determining the correspondence between the via diameter value range and the via diameter tolerance, as well as the via design parameters, based on the design file; creating a via tolerance database based on the correspondence between the via diameter value range and the via diameter tolerance; creating a database of areas to be inspected corresponding to a target inspection area based on the via design parameters; determining inspection rule values ​​corresponding to the target inspection area based on the target inspection area; and determining the via inspection result based on the via tolerance database and / or the database of areas to be inspected, and the inspection rule values. This improves the inspection efficiency and accuracy of the via inspection process, avoids signal distortion and short-circuit burn-out problems caused by incorrect via usage, and thus improves the design quality of printed circuit board products.

The invention provides a pulse signal frequency adaptive acquisition method and system based on a KDE algorithm, and the method comprises the steps: carrying out the isolation protection and voltage conversion of an external pulse signal, and obtaining a TTL level signal; tTL (transistor-transistor logic) level signals are accessed to a GPIO (general purpose input / output) pin with a timer multiplexing function of the MCU module for pulse counting; entering a timer interrupt function after a pulse rising edge of a TTL level signal is triggered, capturing a current timer capturing register value of two continuous rising edges, calculating a difference value, performing conversion in combination with a timer set frequency to complete primary frequency measurement, and storing frequency data into a global variable array; processing the acquired frequency data through a KDE algorithm to obtain frequency distribution of the current pulse input signal; and determining a sampling frequency and a frequency threshold by using a peak index fast search algorithm, and performing signal capture according to the sampling frequency. Through the KDE algorithm, the frequency of the input pulse signal is adaptively acquired, and the interference of the high-frequency signal is inhibited.

The application discloses an electrode rod welding structure and a manufacturing method, and belongs to the technical field of welding structure of electrode rod. The electrode rod welding structure comprises a ceramic electrode base, an electrode assembly and a threaded sleeve. The ceramic electrode base is provided with a threaded hole, and the bottom of the threaded hole is provided with a first assembly part. One end of the electrode assembly is provided with a second assembly part. The electrode assembly is installed in the threaded hole, and the second assembly part is installed in cooperation with the first assembly part. The outer circumferential side of the electrode assembly is formed with a first step part and a welding wire groove. The first step part is located between the second assembly part and the welding wire groove. The welding wire groove is used for placing a welding wire. The threaded sleeve is in a hollow structure. The inner side wall of the threaded sleeve is formed with a second step part matched with the first step part. The threaded sleeve is sleeved on the outer circumferential side of the electrode assembly, and the threaded sleeve is threadedly connected with the threaded hole, so that the electrode assembly is locked in the threaded hole. The application reduces the risk of cracking of the ceramic electrode base, has good sealing air tightness, and is not easy to be de-welded.

An eye needle rehabilitation needle device, comprising a patch assembly (2) and a needle body (3) limited in the center of the patch assembly (2), the patch assembly (2) comprises an insulating film layer (21), a conductive layer (22) and a glue layer (23) which are superimposed from top to bottom, and the technical key points are that a plurality of piezoelectric components (1) are fixed on the patch assembly (2), the piezoelectric component (1) comprises a plastic shell (14), a conductive diaphragm (13), a strip-shaped piezoelectric energy trapping piece (12) and a mass block (11) arranged at the end of the piezoelectric energy trapping piece (12); a through hole (211) is reserved on the insulating film layer (21), the shell (14) passes through the through hole (211) and is limited between the insulating film layer (21) and the conductive layer (22) through the flange (141) at the bottom, and the conductive diaphragm (13) is adhesively fixed with the conductive layer (22). It has the advantages of simple structure, convenient use, long stimulation time and the like.

This invention discloses a synchronous detection device for arrayed permanent magnet and electrochemical impedance spectroscopy (EIS) of steel reinforcement corrosion in concrete, belonging to the field of electronic digital data processing technology. It is suitable for non-destructive testing of concrete structure corrosion in structural health assessment. The device includes at least one sub-detection mechanism. Each sub-detection mechanism comprises a unit frame and, from front to back, a permanent magnet probe, a main wheel, an electrical control box, and wheel-type electrodes arranged sequentially on the unit frame. The permanent magnet probe consists of a permanent magnet and a magnetic coil; the wheel-type electrodes consist of a transmitting electrode and a receiving electrode. The electrical control box is communicatively connected to both the permanent magnet probe and the wheel-type electrodes, and consists of an analog wireless acquisition module, an AC impedance analyzer, and electrode control valves. This device uses a permanent magnet perturbation method to identify the spatial distribution of corrosion state, and then combines this with the dynamic feature extraction of the AC polarization impedance method to quantitatively calculate the corrosion current and corrosion rate. The combination of these two methods allows for the synchronous acquisition and integrated assessment of the amount and rate of steel reinforcement corrosion without damaging the concrete structure. This invention also discloses a method for synchronous detection of arrayed permanent magnet and electrochemical impedance spectroscopy (EIS) of steel reinforcement corrosion in concrete.

The invention discloses a system for measuring a material level state by using microwave intensity, and the system comprises a microwave transmitter which is used for transmitting microwaves with preset intensity; the microwave probe is arranged opposite to the microwave emitter and is used for receiving direct microwaves which are emitted by the microwave emitter and penetrate through a material layer to be detected and converting intensity signals of the received microwaves into electric signals; the microcomputer is connected with the microwave probe and is used for receiving the electric signal and calculating the thickness of the material layer based on the attenuation characteristic of the microwave in the detected material layer so as to determine the state of the material level; the display unit is connected with the microcomputer and is used for displaying a processing result of the microcomputer; and the central control computer is connected with the microcomputer and is used for transmitting a processing result to the central control computer. According to the invention, the problems that the signal of the traditional level gage is easily interfered, the equipment is easily damaged and the traditional level gage depends on manual work are solved, and high-reliability, high-precision, strong-adaptability and intelligent continuous level monitoring is realized.