129 results about "Magneto impedance" patented technology

A magnetic field detection device that detects two components of an external magnetic field. The device uses the magneto-impedance effect in ferromagnetic amorphous wire. A detection coil wrapped around the amorphous wire detects the magnetic flux change of the amorphous wire, which is proportional to the external magnetic field. The sensitivity of the device is increased due to circuitry that extracts the initial output pulse. It is also increased with the use of negative feedback and with the comparison of differential outputs. The two sets of detection elements are placed orthogonally for greatest sensitivity. Resin molding is employed for easy handling. This detection device can be used as part of a compass.

The invention provides a traffic information detecting system, wherein a vehicle detector has similar principle with a magnetic resistance vehicle detector and has better performance than the magnetic resistance vehicle detector; by using giant magneto-impedance variation of a magnetic sensitive material-amorphous wire, the variation of a disturbance geomagnetic field during the passing of a vehicle is detected; a single chip 542 program of an intelligent processing interface board 54 (including an A / D (Analog to Digital) converter 541, a single chip 542 and an RFID (Radio Frequency Identification Device) 543) has a dynamic threshold voltage used for filtering adverse effects of the ambient environment of an amorphous wire probe 532 on the amorphous wire probe 532. Through the vehicle detector and a wireless traffic flow dynamic parameter collecting, storage and receiving system, a traffic flow (including availability, speed, traffic flow, road occupancy, model and the like of the vehicle) can be detected in real time under the situation of wireless communication and can store data in an embedded memory and output the data to external equipment, so that a purpose of directing or improving the traffic is achieved by using a network. According to the invention, the amorphous wire probe 532 manufactured from the magnetic sensitive material has the advantages of low cost, small volume, high response speed, low power consumption and high sensitivity. By using a solar cell 3 to supply power, the usual problem of power consumption is solved; by using a super capacitor and a rechargeable battery 52, the problem of severe environments of rainy weathers as well as sandy and windy weathers is solved; by using a thumbtack structure, the contradict between the burying of the vehicle detector and the pavement protection is solved; and with no fear of rolling of the vehicle, the traffic information detecting system provided by the invention can be used for remote monitoring of traffic conditions, traffic management and traffic statistics and comprises road flow monitoring, vehicle speed monitoring, crossing traffic guidance and vehicle parking management.

The present invention is a magnetic field detection device that makes use of a frequency characteristic affording circuit in order to selectively detect magnetic signals from a frequency domain accurately at a high level of sensitivity. The present invention has a magneto-impedance element, a detector coil and a negative feedback coil which is wound around the magneto-impedance element, and a frequency characteristic affording circuit which affords a frequency characteristics on the negative feedback signal of a negative feedback connecting an output terminal thereof with the negative feedback coil. Using filters as the frequency characteristic affording circuit, the following are possible uses of this magnetic field detection device: a geomagnet detection device for earthquake prediction (using a high-pass filter), a bill validation apparatus for vending machines, etc. (using a low-pass filter), and a magnetic oscillation detection device for a magnetic gate system (using a band-reject filter).

A magnetic field detector is provided that makes use of Magneto-Impedance in order to switch an oscillator between operating states as a function of magnetic field strengths.

The magneto-sensitive wire of the invention has a vortex-spin structure and hence includes no magnetic domain walls, so that the magneto-sensitive wire of the invention has an excellent hysteresis characteristic exhibiting nearly zero hysteresis. Therefore, the linearity related to the output voltage characteristic for the applied magnetic field in the determination range of an MI sensor is significantly improved as compared to MI sensors using the conventional magneto-sensitive wires. Using the magneto-sensitive wire of the invention makes it possible to provide a magneto-impedance (MI) element exhibiting a higher precision than the conventional ones and further provide a sensor using such an MI element.

A reduced size / thickness magnetic detection device includes: a substrate; and a magneto-impedance element at one substrate surface side and including a magneto-sensitive wire and a detection coil. The wire senses an external magnetic field component in a first axis direction in which the wire extends. The coil loops around the wire, and includes left-side and right-side coil parts coexisting along the wire, and a magnetic field direction changing body of soft magnetic material having at least a part at another substrate surface side or in the substrate above an intermediate position between left-side and right-side coil parts. The body can change an external magnetic field component in a third axis direction intersecting the substrate to a measurement magnetic field component in the first axis direction. The external magnetic field component in the third axis direction can be detected from a left-side coil part output and a right-side coil part output.

A magneto-impedance element includes a magnetic sensitive member having a form of a line, whose electromagnetic characteristics vary depending on an external magnetic field, a pulse current flowing from one to another end portion thereof in an axial direction. A conductive layer is arranged on an insulating layer provided on an outer surface of the magnetic sensitive member. A connection portion, electrically connecting the magnetic sensitive member and the conductive layer, is arranged on the other end portion in the axial direction of the magnetic sensitive member. A detection coil, outputting an induced voltage corresponding to an intensity of an external magnetic field acting on the magnetic sensitive member when the pulse current flows in the magnetic sensitive member, is wounded around the conductive layer. A direction of the pulse currents flowing in the magnetic sensitive member and in the conductive layer are opposite each other.

The invention provides a giant magneto-impedance effect biosensor for detecting serum tumor markers. The biosensor consists of a giant magneto-impedance effect sensor positioned on a glass substrate, an insulated layer, an Au film, a biologically sensitive film, a magnetic tag and a signal acquisition system, wherein the giant magneto-impedance effect sensor consists of the NiFe / Cu / NiFe multi-layer film on the glass substrate and is made by the microelectromechanical system (MEMS) technology; the insulated layer is the aluminum oxide layer, the Au film is the splashed Cr / Au film, and the biologically sensitive film is the self-assembled film with nano-level thickness and can be connected with various monoclonal antibodies; and the magnetic tag is streptavidin-modified magnetic nano particles or magnetic beads consisting of magnetic nano particles and can be combined with biotin-modified monoclonal antibodies or polyclonal antibodies. Based on the detection principle of a double-antibody sandwich method, the sensor has a high detection sensitivity and can detect the antigens of which the content of serum tumor markers is as high as 1ng / ml.

The present invention is a magnetic field detection device that makes use of a frequency characteristic affording circuit in order to selectively detect magnetic signals from a frequency domain accurately at a high level of sensitivity. The present invention has a magneto-impedance element, a detector coil and a negative feedback coil which is wound around the magneto-impedance element, and a frequency characteristic affording circuit which affords a frequency characteristics on the negative feedback signal of a negative feedback connecting an output terminal thereof with the negative feedback coil. Using filters as the frequency characteristic affording circuit, the following are possible uses of this magnetic field detection device: a geomagnet detection device for earthquake prediction (using a high-pass filter), a bill validation apparatus for vending machines, etc. (using a low-pass filter), and a magnetic oscillation detection device for a magnetic gate system (using a band-reject filter).

A magnetic detection element suitable for detecting a strength of an external magnetic field, has a magnetic thin film formed on a single non-magnetic substrate, a circuit that applies a high-frequency current to the magnetic thin film, and a spiral-type planar coil that is stacked on the magnetic thin film with an insulating layer, in between. The magnetic thin film is formed in a longitudinal shape, and magnetic anisotropy is provided such that the direction of easy magnetization is orthogonal to the longitudinal direction of the longitudinal shape.

The invention discloses a fuse detector and a detection method thereof. The fuse detector comprises a detecting module, a signal processing module, a feedback module, a target identifying module and an executing module, wherein the detecting module is used for detecting target information and outputting a multi-resonant signal; the signal processing module is connected with the detecting module and is used for outputting a direct current voltage signal; the two ends of the feedback module are respectively connected with the signal processing module and the detecting module; the feedback module is used for feeding back for the detecting module; the target identifying module is connected with the signal processing module and is used for outputting identifying information; the executing module is connected with the target identifying module and is used for executing an detonation operation. According to the invention, the giant magneto-impedance effect of an amorphous wire is utilized, a detecting circuit of an amorphous wire micro-magnetic detector is used for detecting the target information and converting into the multi-resonant signal, a data processing module is used for filtering out the base wave and sub-harmonic wave in the multi-resonant signal and outputting the direct current voltage signal and the feedback module is arranged for generating a feedback magnetic field and is used for feeding back for the detecting module, so that the influence of the outside magnetic field is eliminated and the detection precision of the detector is increased.

The magneto-sensitive wire of the invention has a vortex-spin structure and hence includes no magnetic domain walls, so that the magneto-sensitive wire of the invention has an excellent hysteresis characteristic exhibiting nearly zero hysteresis. Therefore, the linearity related to the output voltage characteristic for the applied magnetic field in the determination range of an MI sensor is significantly improved as compared to MI sensors using the conventional magneto-sensitive wires. Using the magneto-sensitive wire of the invention makes it possible to provide a magneto-impedance (MI) element exhibiting a higher precision than the conventional ones and further provide a sensor using such an MI element.

The invention discloses a cobalt-based amorphous giant magneto-impedance ribbon which is characterized in that the ribbon is made from a cobalt-based amorphous material as raw materials and obtained by taking the steps of orderly smelting, rapid quenching and current heating rapid annealing heat treatment, wherein a direct-current magnetic field is applied during the heat treatment, the expression of the components of the cobalt-based amorphous material is Co(alpha)Fe(beta)V(gamma)Si(delta)B(epsilon), beta is equal to 0-5, gamma is equal to 0-3, epsilon is equal to 12-20, delta is equal to 5-10, both beta and gamma are not equal to 0, and alpha plus beta plus gamma plus delta plus epsilon is equal to 100. The invention also discloses a preparation method of the giant magneto-impedance ribbon. Compared with the prior art, the cobalt-based amorphous giant magneto-impedance ribbon has the advantages that the cobalt-based alloy with excellent soft magnetic property and mechanical propertyis used as mother alloy and current heating rapid annealing treatment under magnetic field condition is carried out so that the processing cost is saved, the production efficiency is improved and theobtained material has higher giant magneto-impedance change rate and magnetic field sensitivity while having excellent soft magnetic property and flexibility.

According to the intended use, an electrical conductor (1) having a magnetically sensitive surface (10) subjected to the magnetic force of a permanent magnet (11) is produced, the area of this surface varying according to its relative position with respect to the magnet, said relative position between the magnet and the magnetically sensitive surface is varied, which causes at least one physical characteristic of this conductor, to vary, and said variation in physical characteristic(s) of the electrical conductor is recorded, this variation being in correlation with the position of the magnet (11).

The invention relates to an experimental apparatus for giant magneto-impedance (GMI) of amorphous wires, which consists of an experimental apparatus host, an external controlled field coil and a GMI sensor experimental platform, wherein a five-digit digital display frequency meter, a four-digit digital display ammeter, a four-digit digital display voltmeter, a function selection switch, a current display switching button, a voltage display switching button, eight numerical control buttons and two signal output ports are arranged on the experimental apparatus host; and a high current and constant current source, a high-precision signal generator and a singlechip control and amplifying circuit are arranged in the experimental apparatus host. Through the measurement of the GMI of the amorphous wires, the students can better understand and master the laws and characteristics of the GMI effect, and can deeply understand the physical significances of magnetic domain, magnetization, skin effect and impedance, etc. The experimental apparatus has a reasonable structure and good teaching effect, is convenient to operate and is applicable to teaching experiments of subjects like electromagnetism, physics and electronics in the universities and colleges.

The invention discloses a magnetic field measurement device based on giant magneto-impedance effect. The device comprises an excitation source (1), a synchronous rectification signal generator (2), a probe (3), a synchronous rectifier (4) and a servo controller (5), wherein the excitation source (1) is connected with the probe (3) through a printed wire and connected with the synchronous rectification signal generator (2) through a printed wire, the synchronous rectification signal generator (2) is connected with the synchronous rectifier (4) through a printed wire, the synchronous rectifier (4) is connected with the probe (3) through a printed wire and connected with the servo controller (5) through a printed wire, and the servo controller (5) is connected with the probe (3) through a printed wire. The magnetic field measurement device based on the giant magneto-impedance effect has the advantages of high sensitivity, resolution and response speed, small size, low power consumption, good temperature characteristic and high linearity.

This invention relates to magnetotelluric survey data signal processing technology. It is a magnetotelluric impedance measurement method. Step: the signal acquisition by the least square method magnetotelluric impedance, and consulate frequency of the electric field and magnetic field signal coherent signal, when more than 75 percent of coherent measurement frequency and impedance in the 0.7-1 phase in the rate of broadband not within the 175-180, magnetotelluric impedance calculation and the results recorded or graphical format. Otherwise, a robust method magnetotelluric impedance type of interference or under the time domain or frequency domain using wavelet automatic threshold pressure on the magnetotelluric method noise signal noise filtering pressure, the invention is conducive to raising magnetotelluric data accuracy and reliability to avoid the man-made factor of magnetotelluric impedance calculation of the impact and relevance of a single judge by MT data quality in near-field presence made an error.

A self-biased giant magneto-impedance sensor probe and a preparation method thereof belong to the technical field of information functional devices. The probe comprises an amorphous strap-shaped magnetic material and metal counter electrodes positioned at two ends of the surface of the amorphous strap-shaped magnetic material, wherein two vectolite films are respectively deposited on two sides of the amorphous strap-shaped magnetic material between the metal counter electrodes; and the upper and the lower vectolite films have consistent hard magnetic phase characteristic in the length direction of the amorphous strap-shaped magnetic material. During preparation of the probe, the key process is that the vectolite films are deposited on the amorphous strap-shaped magnetic material through the radio-frequency magnetron sputtering technology and are magnetized through a magnetizer to present hard magnetic phase. The self-biased giant magneto-impedance sensor probe provided by the invention has the characteristics of small size, easiness in integration and no extra power consumption; the product is simple to prepare, the process is controllable and the stability is high; and a wider linear working space can be obtained and the sensitivity is greatly improved.

The invention discloses an integrated bias coil type giant magneto-impedance effect (GMI) magneto-dependent sensor, which belongs to the technical field of micro-electro-mechanical systems, and comprises a surface-oxidized Si substrate, a tortuous multi-turn sensor, a solenoid bias coil and insulating materials, wherein the tortuous multi-turn sensor is arranged at an internal shaft center of the solenoid bias coil, the insulating materials are packaged outside the solenoid bias coil, and the coil is arranged on the bottom surface of the Si substrate. In the invention, the tortuous NiFe / Cu / NiFe sandwich film GMI sensor and the solenoid bias coil are processed by using the MEMS micro-electro-mechanical system technology, and the GMI sensor is arranged at the shaft center of the solenoid bias coil, thus the offset of an operating point of the GMI sensor can be realized by using magnetic fields generated when direct currents pass through the coil so as to realize the reasonable magnetic-field operating interval range of the sensor.

A magneto impedance sensor element with electromagnetic coil comprised of: a terminal board on which an extended groove which extends in one direction has been formed; an electromagnetic coil, made with one part of the coil formed in a spiral shape inside the extended groove in the terminal board, and joined to each tip of that coil the other part of the coil placed across the top of the groove; insulating material placed in the extended groove on the terminal board; and a magnetic sensitive body inserted within the insulating material, to which either high frequency or pulse electic current is applied. When either high frequency or pulse electrical current is applied to the magnetic sensitive body, voltage is output from the above electromagnetic coil in response to the intensity of the external magnetic field which is generated in the electromagnetic coil.

A magneto-impedance sensor element is formed in a planar type structure in which an amorphous wire is incorporated in a substrate. The magneto-impedance sensor element includes a nonmagnetic substrate, an amorphous wire arranged in an aligning direction of a planar pattern that forms a detecting coil, a spiral detecting coil formed of a planar pattern and a cubic pattern on an outer periphery of the amorphous wire, a planar insulating portion that insulates the planar pattern from the amorphous wire, a wire fixing portion to fix the amorphous wire on an upper surface of the planar insulating portion, and a cubic insulating portion that insulates the cubic pattern from the amorphous wire.

The invention relates to a technology of processing magnetotelluric exploration signal data, and relates to a magnetotelluric impedance estimating method. The method comprises the following steps of: firstly, carrying out Fourier transform on an acquired electric field and magnetic field data, so as to transform the electric field and the magnetic field data into data of a frequency domain; secondly, carry out primary estimation on the impedance by using a least square method; calculating residual values of the electric fields in two directions; selecting a plurality of data groups with small residual values; selecting an appropriate scale value so as to weigh selected electromagnetic data; and recalculating the impedance by using the weighed data. By utilizing the estimation mode, the influence of a flying spot can be effectively eliminated, and the influence of a white gaussian noise is reduced, so that reliable impedance estimation values can be obtained.

The invention provides a method for generating super-high giant magneto impedance effect on an amorphous microwire, and relates to the method for generating the super-high giant magneto impedance effect. The method comprises the following steps: 1, fixing two ends of the microwire through copper flat head fixtures, and placing the microwire in a zero magnetic shielding room to conduct an impedance test; 2, conducting a first step of stepped joule annealing, and then connecting into an impedance test circuit to conduct the impedance test; 3, conducting a second step of the stepped joule annealing, and then connecting into the impedance test circuit to conduct the impedance test; 4, conducting a third step of the stepped joule annealing, and then connecting into the impedance test circuit to conduct the impedance test; 5, conducting a fourth step of the stepped joule annealing, and then connecting into the impedance test circuit to conduct the impedance test. Therefore, the method for generating the super-high giant magneto impedance effect on the amorphous microwire is realized. The method can be applied to the technical field of magnetic sensing and magnetic storing.

In order to obtain a magneto-impedance type magnetic sensor having a soft magnetic film facing to a conductive nonmagnetic film, and available a large impedance change with a carrier signal at a relatively low frequency, the magnetic sensor comprises a meander type conductive nonmagnetic thin film of zigzag shape formed with at least one pair of electrode terminals at both ends and a soft magnetic film which is strip-shaped so as to face thereto at a plurality of regions and has an easy axis of magnetization in a width direction of the strip shape, a high frequency carrier signal is applied to the above-mentioned electrode terminals and further a direct current bias magnetic field is applied. By performing AM detection of an AM modulation signal output from the above-mentioned electrode terminals, an impedance change of the conductive nonmagnetic film which is changed by external magnetic field is detected as a change of the high frequency carrier signal, thereby the external magnetic field can be detected.

The invention discloses a perovskite structure film with the giant magneto-impedance effect and a preparation method thereof, which belongs to the technical field of magnetic material preparation. A manganese oxide of a LaMnOx perovskite structure is used as the film, wherein x is equal to or more than 3, and is equal to or less than 4; and the thickness of the film is 10-400nm. The preparation method for the film comprises the steps as follows: an organic alkoxide compound comprising all metal ions is used as a precursor; the precursor is dissolved into ultrapure water to be stirred and dissolved to obtain precursor solution; the precursor solution is gradually added into methanol dropwise until transparent sol solution is formed; the prepared transparent sol solution is coated on an underlay or coated on the underlay through a pulling method, and is pyrolyzed and sintered in a tubular constant-temperature furnace to prepare a required perovskite structure film. The preparation method is simple and is convenient to operate, requires simpler equipment, has low cost, can prepare films of larger areas, and can precisely control the concentration of the metal ions relative to other preparation methods.

A LC resonance giant magneto-resistance effect compound wire and the preparation method thereof, belong to the technical field of magneto-dependent sensor and information function material as well as their preparation. The compound wire consists of a metal wire (1), a separation layer (2), a soft magnetic layer (3), and a terminal (4). The separation layer (2), a dielectric body, is attached on the surface of metal wire (1) in the way that the terminal (4) of the metal wire (1) is exposed to the outside. The soft magnetic layer (3) is attached on the surface of the separation layer (2), and the terminal (4) and the soft magnetic layer (3) are the two lead-out ends of the compound wire. In preparation, the surface of the metal wire (1) except for the terminal (4) is smeared with the separation layer (2), and a soft magnetic layer (3) in a chemical way is provided on the separation layer (2), thus producing the LC resonance giant magneto-resistance effect compound wire. The compound wire has the advantages of simple technique, low cost, high giant magneto-resistance effect, high disturbance resistance, small geometrical size, and convenient and reliable application in appliances.

A magneto impedance sensor element with electromagnetic coil comprised of: a terminal board (1) on which an extended groove (11) which extends in one direction has been formed; an electromagnetic coil(3), made with one part of the coil (31) formed in a spiral shape inside the extended groove (11) in the terminal board (1), and joined to each tip of that coil the other part of the coil (32) placed across the top of the groove; insulating material (4) placed in the extended groove (11) on the terminal board(1); and a magnetic sensitive body (2) inserted within the insulating material (4), to which either high frequency or pulse electic current is applied. When either high frequency or pulse electrical current is applied to the magnetic sensitive body, voltage is output from the above electromagnetic coil in response to the intensity of the external magnetic field which is generated in the electromagnetic coil.

A technique is provided which reduces the coil pitch and increases the number of coil turns in an MI element and allows for high sensitivity and miniaturization. The MI element is configured such that a magnetic wire and a coil wound around the magnetic wire are disposed on an electrode wiring substrate. When manufacturing the coil, a three-layer structure of the coil and thin film coil strips formed by a vapor deposition process are focused on thereby to allow the coil pitch to be 14 micrometers or less. The three-layer structure comprises coil lower portions of a recessed shape, coil upper portions of a protruding shape, and through-hole portions that connect the coil lower portions with the coil upper portions.

A magnetic field detection sensor includes a magneto-impedance element configured to make use of the magneto-impedance effect, and a negative-feedback bias coil configured to apply a bias magnetic field to the magneto-impedance element. The magnetic field detection sensor is configured to detect an external magnetic field based on an output obtained by applying an alternating-current to the magneto-impedance element. The magneto-impedance element includes a non-magnetic substrate, and a magnetic thin-film that is provided on a surface of the non-magnetic substrate. The magnetic field detecting direction matches the longitudinal direction of the magneto-impedance element, and the magnetic thin-film is configured to have a magnetic anisotropy such that a direction of an axis of easy magnetization thereof matches the magnetic field detecting direction.