94 results about "Magnetic probe" patented technology

The invention provides a method and system for diagnosing high-frequency magnetic disturbance in a quasi-ring symmetrical star simulator, and relates to the technical field of star simulators, and the method comprises the steps: designing the three-dimensional size of a magnetic probe body in combination with a physical research target and a vacuum chamber space limiting condition, and preparing a magnetic probe entity adaptive to an experimental environment; designing a magnetic probe array space layout according to the triangular magnetic configuration characteristics of the CFQS star simulator to obtain a positioned magnetic probe array; a positioned magnetic probe array is utilized to construct a signal transmission link, and a calibration qualification system is formed; generating a multi-channel time domain voltage signal set according to a calibration qualified system; and performing frequency response correction on the multi-channel time domain voltage signal set in combination with a transfer function database, analyzing a disturbance mode structure and a propagation direction through time-frequency spectrum analysis and array phase difference, and finally outputting three-dimensional magnetic disturbance evolution characteristics. The three-dimensional high-frequency magnetic disturbance measuring device has the beneficial effects that the three-dimensional high-frequency magnetic disturbance measuring capability is realized, multi-channel high-fidelity signal acquisition can be realized, and the experimental data quality and the physical analysis capability are improved.

This invention discloses a mechanical guide vane master controller, which utilizes a movable wedge-shaped trigger rod to trigger left and right limit switches at the same position, causing each limit switch to output a switching signal. The wedge-shaped trigger rod also moves a travel trigger plate, and magnetic probes at both ends of the travel trigger plate cooperate with corresponding travel sensors to trigger left and right travel sensors to output analog signals. This invention is used for monitoring the travel signals of turbine guide vanes, and can output redundant switching and analog signals, unaffected by weather, location, time, or unit operating conditions, thus offering higher reliability.

The invention relates to the technical field of defect detection, in particular to a robot magnetic detector constant magnetic field control system and method, and the system comprises a control circuit, a power supply circuit, a magnet yoke winding drive circuit, a magnet yoke winding current detection circuit, a magnet yoke winding temperature detection circuit, a magnetic field detection circuit and a switching signal input and output circuit. The robot magnetic detector constant magnetic field control system and method have the advantages that high-precision constant magnetic control is achieved, detection quality can be guaranteed, intelligent temperature protection can be achieved, equipment damage is prevented, anti-interference design is carried out, signal acquisition reliability can be improved, multi-state indication and remote control are achieved, operation efficiency can be improved, and the robot magnetic detector constant magnetic field control system and method are suitable for popularization and application. The whole system is compact in structure and reasonable in circuit layout, adapts to robot integration, and meets automatic detection requirements of special equipment in complex environments such as high altitude and closed environments.

A fluxgate current sensor and a current measurement method, wherein the fluxgate current sensor includes a magnetic probe and an excitation and detection circuit, and the magnetic probe includes an excitation iron core and an excitation coil, the excitation coil is connected to the excitation and detection circuit, the excitation and detection circuit is used to output alternating excitation voltages to the excitation coil, and the excitation coil is excited to generate alternating excitation currents and cause the excitation iron core to reach saturation alternately; the excitation and detection circuit is further configured to convert the excitation currents flowing through the excitation coil, into equivalent differences of two currents, so as to calculate average values of the excitation currents flowing through the excitation coil via differential equivalent currents, thereby calculating to-be-measured primary currents by the average values of the excitation currents.

The present disclosure provides a detection system comprising: one or more magnetic probes configured to acquire stress measurements at a plurality of points along a surface of a sample, where stress data is acquired at a plurality of angles for each of the plurality of points; and a computing system communicatively coupled to the one or more magnetic probes, the computing system including at least one data processor and a memory storing a plurality of predetermined material calibration parameters and material characteristics of a plurality of materials and instructions, the instructions, when executed by the at least one processor, cause the at least one processor to perform operations including receiving stress measurements from the one or more magnetic probes, comparing the stress measurements to the material calibration parameters and material characteristics, determining a material characteristic of the sample based on the comparison, and determining the material characteristic of the sample based on the determined material characteristic. And providing the material characteristics of the sample to a user interface display.

A system and method for investigating a cell are provided. In some aspects, the system includes a sample substrate having a base with a first surface and a second surface, and a sample receptacle formed by an opening in the base and a membrane that spans the opening in the base, and a magnetic measurement apparatus operable to perform a magnetic field measurement on a sample comprising a cell localized in the sample receptacle. The magnetic measurement apparatus includes a magnetic probe having a resonant frequency, and an actuator system, connected to the magnetic probe, that drives the magnetic probe at a driving frequency or at the resonant frequency to sense a magnetic field in or about the sample. The system also includes an electrical measurement apparatus operable to perform an electrical measurement on the sample.

The present application relates to the technical field of pipeline crack detection, and is a pipeline crack recognition device and method based on magnetic probe micro-pressure sensing technology. The former comprises at least one set of magnetic probe micro-pressure detection assembly. The latter comprises assembly and debugging preparation, data acquisition and processing, and data analysis and defect recognition. The present application has a reasonable and compact structure. It realizes smooth running and spiral scanning through elastic driving leather bowl and driving short section. The magnetic attraction force is applied to the pipe wall by the micro-pressure information acquisition short section and is converted into a micro-pressure signal. The magnetic elastic effect is used to capture the abnormal magnetic properties caused by hydrogen embrittlement, realize early warning of potential defects and double detection of macroscopic cracks, and effectively avoid missed detection. The micro-pressure data and three-dimensional space coordinates are fused into a detection matrix by a ranging module, an angle acquisition module and a conductive rotary joint, so that the three-dimensional defect map of the pipe wall is accurately reconstructed and the data is standardized stored.

The application relates to the technical field of amorphous soft magnetic material preparation, and discloses a cobalt-based amorphous soft magnetic alloy material, a preparation method thereof and application. a Fe b Mo c Si d B e C f M g In the formula, a, b, c, d, e, f and g respectively represent the atomic percentage content of corresponding components; wherein 50<=a<=70, 2<=b<=8, 0.5<=c<=5, 10<=d<=20, 10<=e<=20, 0.01<=f<=0.5, 0.1<=g<=5, and a+b+c+d+e+f+g=100; and M represents at least one of elements V, Cr, Mn and Nb. The cobalt-based amorphous soft magnetic alloy material provided by the application has low saturation magnetic induction intensity, low coercive force, high rectangular ratio and other superior soft magnetic properties, is good in corrosion resistance and easy to prepare; and a magnetic probe prepared from the alloy material has high precision in sensor testing, and has important significance for promoting the development of small high-precision magnetic flux gate current sensors.

The utility model relates to the technical field of nuclear magnetic resonance detection, and discloses a heat insulation structure and a nuclear magnetic probe, the heat insulation structure is suitable for being installed in the nuclear magnetic probe and comprises a supporting assembly and a heat insulation assembly, the supporting assembly comprises two supporting pieces and an installation piece, the two supporting pieces are oppositely arranged, the installation piece is arranged between the two supporting pieces, and the heat insulation assembly is arranged between the two supporting pieces. The two ends of the mounting piece are connected with the supporting pieces respectively, any supporting piece is provided with a penetrating part, the mounting piece is provided with a placing part, the placing part is communicated with the penetrating part, and the placing part is suitable for placing a sample; the heat insulation assembly is arranged between the two supporting pieces and the mounting piece in a sleeving mode and is provided with a vacuum cavity, and the inner wall face of the vacuum cavity is subjected to silver plating treatment; the heat insulation performance of the heat insulation structure is improved, the heat insulation structure is not provided with a metal shielding layer, eddy current cannot be generated in an alternating magnetic field, the situation that nuclear magnetic imaging quality is poor or imaging cannot be achieved cannot be caused, the heat insulation structure is easy to install, and the overall assembly difficulty of the probe can be reduced.

The application discloses a kind of orthogonal welding tool, for when being used in preparation three-axis orthogonal magnetic probe, three-axis orthogonal magnetic probe includes horizontal circuit board and vertical circuit board, orthogonal welding tool includes first mounting seat, second mounting seat and compression structure.First mounting seat is equipped with first installation groove, and first installation groove is used to place horizontal circuit board.Second mounting seat is equipped with second installation groove, and second installation groove is used to place vertical circuit board.Compression structure includes pressing block.The pressing block of multiple compression structures is respectively used to be fixed in first installation groove with the vertical circuit board being fixed in second installation groove with the horizontal circuit board being compressed tightly.Wherein, first mounting seat and second mounting seat can slide relative to each other, to make horizontal circuit board and vertical circuit board can be translated and keep perpendicular to each other.Compared with prior art, the orthogonal welding tool of the application is used in preparation three-axis orthogonal magnetic probe, to improve the perpendicularity of horizontal circuit board and vertical circuit board of three-axis orthogonal magnetic probe.

The invention discloses an underground rock stratum casing distance magnetic detection method and system, and belongs to the technical field of oil and gas well drilling. The method comprises the following steps that S1, a steel short casing is fixed to a support; s2, the first casing pipe and the second casing pipe are connected together through threads to form an outer casing pipe, and then the outer casing pipe is placed on a supporting pipe frame; s3, processing the collected rock blocks into a plurality of cylindrical rock pillars, and pushing the cylindrical rock pillars into the outer sleeve; s4, a magnetic probe, a circuit board and a battery are installed on the inner wall of the titanium alloy outer shell, the circuit board is electrically connected with the battery, and the magnetic probe is electrically connected with the circuit board; and S5, the outer sleeve is placed between the steel short sleeve and the titanium alloy outer shell, the magnetic probe is opened, and magnetic lines emitted by the magnetic probe penetrate through the cylindrical rock pillar in the axial direction of the outer sleeve till the magnetic lines touch the steel short sleeve. The oil field on-site requirement can be met, the overall magnetic detection operation is simple, and the magnetic detection accuracy can be improved.

The application relates to the technical field of aerospace space electromagnetic propulsion, in particular to a high-frequency rotating magnetic field transient magnetic field configuration measuring system and method, the system comprises a high-frequency rotating magnetic field, a three-axis inductive magnetic probe, a signal transmission bus and an oscilloscope, wherein: a plurality of three-axis inductive magnetic probe arrays are uniformly distributed in the high-frequency rotating magnetic field to be measured; one end of the signal transmission bus is fixed at the boundary of the high-frequency rotating magnetic field region to be measured, and the other end is connected with the oscilloscope; the signal transmission line of each three-axis inductive magnetic probe is connected with the signal transmission bus; the oscilloscope is internally provided with a data processing system, which is used for collecting inductive magnetic field signals and processing the same, and displays the configuration and dynamic change of the high-frequency rotating magnetic field to be measured in real time. The application is suitable for transient rotating magnetic field configuration detection with a frequency of 0-1 MHz, and the known inductive magnetic probe, the oscilloscope and other instruments are combined skillfully to have the ability of high-frequency magnetic field measurement.

This invention proposes a CRISPR-Cas12a bioassay platform based on AuNPs-labeled magnetic probes for HIV-related nucleic acid detection. Nucleic acid amplification strategies are commonly used to improve sensitivity, but they suffer from drawbacks such as long processing time, complex operation, high risk of contamination, and mismatch-related inaccuracies. This invention proposes a method that eliminates the need for traditional nucleic acid amplification. It achieves sensitive detection of target nucleic acids by combining the self-amplification effect of CRISPR-Cas12a with a dual amplification method utilizing the strong signal detectable by gold nanoparticles in inductively coupled plasma mass spectrometry. The method of this invention achieves a low detection limit of 1.05 amol for HIV-related nucleic acids and has been successfully validated in spiked recovery experiments using fetal bovine serum.

The invention belongs to the technical field of molecular diagnosis, and particularly relates to a miRNA amplification-free detection system and a preparation method and application thereof. The invention provides a miRNA detection system. The miRNA detection system comprises a CRISPR / Cas12a system, a double-labeled magnetic probe and a test strip. The detection system provided by the invention can improve the detection sensitivity and specificity of miRNA under the condition of no nucleic acid amplification; normal color development of a control line of the test strip can be ensured, and reliable interpretation of a result is realized; the device supports rapid, visual and portable result reading and data processing, and is suitable for on-site instant detection.

The application discloses a telescopic supporting arm for a magnetic detector, and belongs to the technical field of magnetic detectors. The telescopic supporting arm mainly comprises a supporting arm, a telescopic assembly arranged on the supporting arm, a supporting rod rotatably connected to the inner side of the supporting arm, a supporting seat connected to the surface of the supporting rod, and a fixing seat connected to the surface of the supporting seat. The telescopic supporting arm for the magnetic detector is convenient for the supporting seat and the fixing seat to be inclined and adjusted through the extension driving force or the retraction driving force of the first driving source and the hinging action of the first hinge seat and the second hinge seat, so that the corresponding magnetic suspension liquid spraying pipe can be inclined and adjusted, and the spraying direction of the magnetic suspension liquid spraying pipe can be adjusted. The two magnetic suspension liquid spraying pipes can be driven to extend outward or retract inward under the rotating action of the first adapter ring and the second adapter ring through the two second driving sources, the spraying range of the magnetic suspension liquid can be expanded through the driving of the magnetic suspension liquid spraying pipe to retract inward and extend outward, and the flexibility of use is improved.

Provided herein is a system including an IV catheter assembly with a catheter having a distal end positionable intravenously within a patient and a port providing fluid access to the catheter. The system also includes a pre-filled syringe connectable to the port and that contains an aqueous catheter lock solution having magnetic particles suspended therein. The system further includes a probe module comprising a magnetic probe that includes a magnet element and a driver. The magnetic probe is operable in a first driving mode where the magnet element causes the magnetic nanoparticles to migrate towards the distal end of the catheter and is operable in a second driving mode where the magnet element causes a temperature of the magnetic nanoparticles to increase, generating a magnetically-induced hyperthermic condition at the distal end of the catheter that prevents and / or treats thrombus formation and biofilm accumulation in the catheter.

The invention discloses a transient electromagnetic detection device based on a GMI weak magnetic probe array, and belongs to the technical field of geophysical detection. Comprising a transmitting device, the transmitting device comprises a transmitting coil and a transmitting coil current driving module, and the transmitting coil is connected with a signal control and data processing device through the transmitting coil current driving module; the receiving device comprises a GMI weak magnetic probe array, compensation coils and a compensation coil current driving module, the multiple compensation coils are coaxially and uniformly arranged in the transmitting coil along the circumferential side, the compensation coils tightly surround the outer side of the GMI weak magnetic probe array, the compensation coils are connected with the compensation coil current driving module, and the compensation coils are connected with the GMI weak magnetic probe array. The GMI weak magnetic probe array and the compensation coil current driving module are connected with the signal control and data processing device, and the transmitting coil current driving module is connected with the compensation coil current driving module. According to the invention, the secondary magnetic field is directly measured through the GMI weak magnetic probe array and the active field offset technology, and the shallow resolution and the anti-interference capability are improved.

The invention relates to a high-integration rotor aeromagnetic integrated unmanned aerial vehicle system, and belongs to the technical field of aeromagnetic detection, the high-integration rotor aeromagnetic integrated unmanned aerial vehicle system comprises a cabin, a magnetic probe rod and a fluxgate, the magnetic probe rod and the cabin are connected with a cabin support, a cesium optical pump and a fluxgate sensor are installed on the magnetic probe rod, and the cesium optical pump is used for obtaining scalar magnetic field data; the fluxgate sensor is used for acquiring vector magnetic field data; a flight control module, a data transmission module and an electronic cabin module are arranged in the cabin; the electronic bin module is in communication connection with the cesium optical pump and the fluxgate sensor and used for sending received scalar magnetic field data and vector magnetic field data to the data transmission module through the flight control module, the data transmission module carries out data integration and then sends the data to the upper computer software through the remote controller, and the upper computer software carries out analysis to obtain aeromagnetic information. High integration of the aeromagnetic detection system is achieved, magnetic field data and flight control data can be shared in real time, the weight and the size are reduced, and the cruising ability of the unmanned aerial vehicle is improved.

This invention discloses an excitation circuit and method for a fluxgate magnetic probe. The excitation circuit includes a crystal oscillator, a frequency divider, a D flip-flop, a first current amplifier, a second current amplifier, a first resistor, a second resistor, a first capacitor, a second capacitor, a transistor, and an excitation coil. The crystal oscillator generates a high-frequency periodic signal, which is input to the input terminal of the frequency divider. The frequency divider divides the signal to obtain a square wave signal of the desired frequency. The square wave signal is input to the input terminal of the first current amplifier and the data input terminal of the D flip-flop. The data output terminal of the D flip-flop is connected to the input terminal of the second current amplifier. The first current amplifier is sequentially connected to the first resistor, the first capacitor, the excitation coil, the second capacitor, and the second resistor. The other end of the second resistor is connected to the output terminal of the second current amplifier. The base of the transistor is connected to the output terminal of the first current amplifier, and the collector of the transistor is connected to the clock control terminal of the D flip-flop.

The invention relates to the technical field of metal part forming and manufacturing, in particular to a Z-shaped thin-wall battery pack support forge piece, a forming die and a forming method. The pre-forged piece is placed in a precision forging cavity in the forming die, the press machine is started again, and precision forging forming is conducted; placing the precision forge piece into a holding and cutting die frame, and trimming the precision forge piece; sawing the bilaterally symmetrical bracket to obtain two bilaterally symmetrical forgings; the method comprises the steps of magnetic probe cleaning and warehousing, pre-forging guiding distribution and precision forging final shaping, so that metal flows to asymmetric thin-wall wing parts on the two sides more smoothly and more evenly from a central area, the flowing resistance is reduced to the maximum extent, a pre-forging cavity and a precision forging cavity are integrated in the same die module, and a high-strength unbalance-loading-resistant guiding assembly is arranged; high-precision forgings are obtained through one-die two-piece layout and parallel integrated design of pre-forging and precision forging cavities, the production efficiency and the material utilization rate are improved, and the manufacturing cost is reduced; and the design and manufacturing difficulty of the trimming die is simplified.

Board-level transmissions can inadvertently reveal secret information when intercepted by an EM probe within range of an electronic assembly. To mitigate the side-channel attacks, an electronic assembly may measure a real-time impedance at a receiving subsystem to detect changes in the impedance caused by the added impedance of the EM probe. A controller may then look up electric and magnetic field values corresponding to the measured impedance to identify a location of the EM probe. Component values may be selected for an adjustable impedance to steer the EM emissions away from the EM probe. The system may react continuously to any movements of the probe to adjust the direction of any EM emissions away from the probe.

A method for determining a total pitch deviation of a position sensor, the position sensor being equipped with a magnetic disc and a magnetic probe, the magnetic disc comprising pairs of magnetic poles, the method comprising the steps of: - recording the magnetic field strength of one revolution of mechanical rotation, measured by the magnetic probe, as an angular signal as a function of the angle of rotation of the magnetic disc; - determining zero-crossing positions from the recorded angular signal and a determined number of zero-crossing positions; - determining a pole pair length from the zero-crossing positions; and - determining the total pitch deviation from the pole pair length.

The invention relates to the technical field of nuclear magnetic logging jam prevention and jam release, in particular to a controllable and releasable nuclear magnetic instrument mud eliminator and a using method. The controllable and releasable nuclear magnetic instrument mud eliminator comprises a fixed steel sleeve, a mud eliminator body, a lower short section, a shearing device and a nuclear magnetic probe body; the fixed steel sleeve is sleeved on one side of the nuclear magnetic probe body; the slurry excluder body slidably sleeves the nuclear magnetic probe body, one end of the slurry excluder body abuts against the fixed steel sleeve, and the other end of the slurry excluder body is fixedly connected with the lower short section; the shearing device is connected to the interior of the lower short section, and the end part of the shearing device is connected with the nuclear magnetic probe body. The mud remover is separated from the nuclear magnetic probe body through the shearing device, so that the nuclear magnetic probe body is protected from being damaged. By means of the design, the adaptability and safety of the instrument are improved, and the risk of logging operation is reduced.

The invention discloses an electrochemical detection method combining responsive hydrogel and a periodic magnetic modulation system, and belongs to the field of electrochemical detection. The method comprises the following steps: preparing hydrogel with target response characteristics, and embedding a magnetic material with electrochemical activity in the hydrogel; an analysis target acts on the hydrogel to enable the hydrogel to generate phase change, and then the magnetic material is separated; and cleaning and enriching the separated magnetic material, resuspending the magnetic material in an electrolyte required by electrochemical testing, and performing quantitative detection by using a periodic magnetic modulation system to obtain a dynamic electrochemical signal with a frequency characteristic. Through the synergistic effect of target responsive release, magnetic probe enrichment and periodic magnetic regulation and control, the detection sensitivity, selectivity and anti-interference capability are remarkably improved, and the method has wide application prospects in the fields of biomedical detection, environmental monitoring, food safety and the like.

The invention provides an efficient temperature control nuclear magnetic probe system and application thereof, and belongs to the technical field of nuclear magnetic probe systems, the efficient temperature control nuclear magnetic probe system comprises a shell, a probe body and a temperature control unit, the probe body is arranged in the shell, the temperature control unit is arranged on the side of the probe body, the temperature control unit comprises a temperature control shell I, one side of the temperature control shell I is hollow, and the other side of the temperature control shell I is hollow. The temperature control device comprises a first temperature control shell, an input connector and an output connector are arranged on the side wall of the first temperature control shell, the input connector and the output connector are arranged in a mirror image mode, a second temperature control shell is arranged on the hollow side of the first temperature control shell, a first connecting cavity is reserved in the inner wall of the second temperature control shell, and a rubber sheet is arranged on the side wall of the first temperature control shell. According to the invention, the problem that the accuracy of a detection result is influenced because the temperature of a surrounding coil is raised to a very high temperature during the application of the nuclear magnetic resonance probe and the temperature of a substance detected in the probe is also raised under the condition that the temperature is high for a long time is solved.

The invention provides a garment sorting system and method. The sorting system comprises a needle detection unit, an image recognition unit and a sorting unit. The needle detecting unit comprises a needle detecting channel and a first conveying belt, the first conveying belt penetrates through the needle detecting channel, and magnetic probes are arranged on the upper side and the lower side of the needle detecting channel respectively. The image recognition unit comprises an image recognition channel and a second conveying belt, the second conveying belt penetrates through the image recognition channel, and image recognition equipment is arranged above the image recognition channel; the sorting unit comprises a sorting table, a sorting device is arranged on the surface of the sorting table, and a sorting grid opening and a removing grid opening are formed in the edge of the sorting table; an outlet of the first conveying belt is close to an inlet of the second conveying belt, and an outlet of the second conveying belt is close to an inlet of the sorting table. The technical problems that in the prior art, a needle detector is low in efficiency and cannot be compatible with a fast-paced code scanning and sorting system, and after needle detection, the needle detector is difficult to trace to maintain and inspect equipment are solved.

This invention provides an atomic spin-resolved probe, its fabrication method, and its applications, belonging to the field of materials science and technology. The atomic spin-resolved probe includes: a tip base with a flat end face; a functional tip bonded to the tip base, the functional tip having a tapered structure that tapers continuously away from the tip base; and a metallic bonding layer for bonding the end face of the tip base to the functional tip; wherein the functional tip is a single-crystal material with topological edge states. This atomic spin-resolved probe alleviates the uncertainty of traditional magnetic probes that rely on magnetic field reversal for spin selection, achieving in-plane spin detection without external magnetization, and providing a high-precision detection tool for studying the spin structure of complex quantum materials.

The application discloses a nuclear magnetic probe relay mounting bracket assembly and a nuclear magnetic probe, and belongs to the technical field of oil exploration and development, which comprises an electrical connection assembly, a sealing assembly and a frequency adjusting assembly. The electrical connection assembly comprises an upper joint, a lower joint and a transition rod, and the upper joint and the lower joint are respectively connected to the two ends of the transition rod. The sealing assembly comprises a sealing plug body, a pressure-bearing sealing plug and a sealing plug pin. The sealing plug pin penetrates through the middle part of the sealing plug body and is sealingly connected to the middle part. The sealing plug pin is electrically connected to the lower joint. The pressure-bearing sealing plug is connected to the sealing plug body, and the sealing surface of the pressure-bearing sealing plug protrudes from the outer diameter side of the sealing plug body. The frequency adjusting assembly comprises a mounting disc for mounting a relay. The mounting disc is connected to one side of the sealing plug body close to the upper joint. The application can improve the sealing performance in the environment of an ultrahigh pressure wellbore and improve the frequency adjusting precision by sealing with the sealing assembly and adjusting frequency with the frequency adjusting assembly.

The present application belongs to the technical field of IGBT bonding wire fault detection, and specifically provides an IGBT module bonding wire peeling detection method based on surface magnetic signals, to avoid the invasiveness and destructiveness of the existing bonding wire peeling detection method based on magnetic signals due to sensor arrangement. The present application uses a ferrite coil magnetic probe to capture a significant voltage signal induced by the transient magnetic field on the surface of the IGBT module excited by the load current in the off process, analyzes the response characteristics of the bonding wire peeling event based on the induced voltage signal, and finally realizes IGBT module bonding wire peeling detection, completes non-invasive detection without electrical direct connection, and has wide application prospects in in-situ online detection of bonding wire peeling.

A system and method for locating magnetic material. In one embodiment the system includes a magnetic probe; a power module in electrical communication with the magnetic probe to supply current to the magnetic probe; a sense module in electrical communication with the magnetic probe to receive signals from the magnetic probe; and a computer in electrical communication with the power module and the sense module. The computer generates a waveform that controls the supply of current from the power module and receives a signal from the sense module that indicates the presence of magnetic material. The magnetic probe is constructed from a material having a coefficient of thermal expansion of substantially 10−6 / ° C. or less and a Young's modulus of substantially 50 GPa or greater. In one embodiment magnetic nanoparticles are injected into a breast and the lymph nodes collecting the particles are detected with the probe and deemed sentinel nodes.