286 results about "Magnetic detector" patented technology

Magnetic nanoparticles and methods for their use in detecting biological molecules are disclosed. The magnetic nanoparticles can be attached to nucleic acid molecules, which are then captured by a complementary sequence attached to a detector, such as a spin valve detector or a magnetic tunnel junction detector. The detection of the bound magnetic nanoparticle can be achieved with high specificity and sensitivity.

A magnetic detector locates magnetically tagged items, such as surgical sponges or instruments, introduced to and remaining in the body cavity of a surgical patient. The magnetic detector is a wand or probe that is manually handleable, and spatially manipulable and moveable, by an operator, such as a medical professional. The detector is moved about at a spatial location of an ambient magnetic field at the patient and operating table. A characteristic of the ambient magnetic field at the spatial location is saved by the detector. The detector is subsequently moved about at the same spatial location. If any magnetically tagged item is present in the vicinity of the detector during this subsequent movement at the spatial location, an anomalous magnetic effect is detected by comparison of the prior detection reading absent the tagged item to the detection reading in presence of the tagged item in the patient. The anomalous magnetic effect, and thus the tagged item, is locatable spatially in the patient, by three-dimensional sensor(s), arrays of sensors, and pluralities of arrays of sensors of the detector. The different detection readings with and without presence of the anomalous magnetic effect caused by presence of the tagged item in the patient are calculable as scalar, vector array, and / or gradient array determinations, according to the particular number and configuration of sensors in the detector.

A collision detecting device providing the accurate and early determination of a collision with a vehicle or the like and a passive safety system using this collision detecting device. A low-rigid portion and a crash box are arranged ahead of the high-rigid portion in a front portion of a frame. The front end of a rod is fixed to a bumper. The rod is inserted into a magnetic detector disposed on the high-rigid portion. In the rod, a number of magnets are aligned in the longitudinal direction of the rod such that their N poles and S poles are alternatively arranged. As a vehicle collides, the crash box is first deformed so that the rod moves backward, whereby a collision can be detected before large acceleration is generated.

An electronic apparatus (10) includes a main body (30), a lid (20) pivotably connected with a side of the main body, a magnetic detecting unit (40) and a magnetic shield member (28). The detecting unit includes a magnetic body (42) mounted on one of the main body or the lid and a magnetic detector (44) mounted on the other one of the main body or the lid, respectively. The magnetic body has a facing side (421) to face the magnetic detector. The magnetic detector detects a position of the lid according to a magnetic field intensity of the magnetic body. The magnetic shield member is disposed at a distance from the facing side and adjacent to a second side (422) of the magnetic body, to prevent the magnetic field from extending in the direction of the second side of the magnetic body.

The invention relates to a magnetic-field dynamic compensation system and methods based on spatial correlation, wherein the system can realize the dynamic compensation of environment magnetic fields at the directions of three axles through a large set and a small set of Helmholtz coil racks and two fluxgate meters based on the spatial correlation of a PID (Proportion Integration Differentiation) negative feedback electronic circuit and the fluctuation of the environment magnetic fields. The invention further discloses three methods using the system, including (1) a proportioning type magnetic-field dynamic compensation method, (2) a series type integral magnetic-field dynamic compensation method, and (3) a parallel integral type magnetic-field dynamic compensation method. The system of the invention is easy to construct, has low cost and simple operation, and can achieve excellent dynamic compensation effect, and simultaneously, the methods can maximally eliminate the affects of the fluxgate meters to other magnetic detectors at the centers of coils, and have great application prospect in extremely-low field nuclear magnetic resonance, imaging thereof and other biological magnetic researches based on an SQUID (Superconducting Quantum Interference Device).

A linear motor includes a slider unit having a magnet row in which plural permanent magnets are arranged in series so that the same poles are opposed to each other, a stator unit including electromagnetic coils for plural phases arranged along a movement direction of the slider unit, and plural magnetic detector devices, wherein the plural magnetic detector devices are provided in response to the phases of the electromagnetic coils for plural phases and detect magnetic flux radially extending in a direction perpendicular to the arrangement direction of the permanent magnets at boundaries between the permanent magnets of the magnet row and output signal waveforms for plural phases at phases equal to phases of waveforms of back electromotive forces generated in the respective electromagnetic coils for plural phases when the magnet row moves.

This invention relates to methods and apparatus for localizing an in vivo imaging device by means of a single magnetic source coil assembly and a single magnetic detector coil assembly. This invention also relates to methods and apparatus to enable the use of a single magnetic source coil assembly to also transmit and receive information, images, and controls signals, as well as for the coil assembly to be used in DC-DC voltage conversion. A user interface with a display provides the user with the option of viewing selected images captured by the in vivo imaging device.

Earplugs (22, 24) and a combination (20) of a pair earplugs and a cord (26) that joins them, each can be detected by metal and / or magnetic detectors even if the parts of the combination becomes separated and fall into a batch of food, etc. Each earplug includes an earplug core (32) formed of a first elastomer with a multiplicity of metal-mag detectable particles (36) (particles detectable by electrical or magnetic detectors) embedded in the first elastomer, and an earplug covering (32) of a second elastomer (that may be the same as the first one) that is devoid of such particles. The cord includes a cord core (50) formed of a first flexible polymer with metal-mag detectable particles embedded therein, and a cord covering (54) formed of a second polymer that is devoid of such particles. The particles are preferably of iron, which is magnetically detectable but that can mark skin or clothing that it contacts, but which is isolated from the skin and clothing by the earplug and cord coverings. The earplug covering can be molded and then filed with the earplug core. The cord core can be extruded and the covering extruded around the core.

A collision detecting device providing the accurate and early determination of a collision with a vehicle or the like, and a passive safety system using this collision detecting device. A low-rigid portion and a crash box are arranged ahead of a high-rigid portion in a front portion of a frame. The front end of a rod is fixed to a bumper. The rod is inserted into a magnetic detector disposed on the high-rigid portion. In the rod, a number of magnets are aligned in the longitudinal direction of the rod such that their N poles and S poles are alternatively arranged. As a vehicle collides, the crash box is first deformed so that the rod moves backward, whereby a collision can be detected before large acceleration is generated.

A magnetic pattern detection system (200) includes a housing (201), and a magnetic detector (100) including at least one magneto resistive (MR) sensor array (144) having an easy axis within the housing. A magnetic field source (151, 152) is within the housing (201), wherein the magnetic field source is operable when turned on to provide a magnetic field to line up random magnetic domains along the easy axis of the MR array (144). An amplifier (170) within the housing (201) is coupled to an output of the MR sensor array (144).

The invention discloses a container automated wharf loading and unloading system and method. Containers on board are loaded or unloaded through a double-trolley and double-platform bridge crane; an automated guided vehicle refitted by a common truck, on which a metal magnetic detector, a GPS (global positioning system) reader-writer, a laser collision avoidance system and an image display system are arranged, travels along a metal enamel leading line through the metal magnetic detector; the GPS reader-writer reads radio frequency card address positions on the ground; the laser collision avoidance system and the image display system measure collision avoidance functions of people and objects; a rail tyre crane travels through rails when conveying the containers and travels through tyres during site changing; guide vehicle and outer truck lanes exist in a site and do not disturb each other; an outer truck is guided through the GPS reader-writer when entering a wharf; a common container wharf is transformed into a full-automatic container loading and unloading wharf through the equipment improvement.

An electric current detector has a bus bar with a current direction changing section for changing a direction of electric current through the bus bar, and a magnetic detector disposed in the current direction changing section of the bus bar. The current direction changing section of the bus bar has a pair of parallel portions at which the bus bar is orthogonally deformed, and a connection portion at which the pair of parallel portions are connected, and the magnetic detector is disposed between the pair of parallel portions. The magnetic detector has a magnetic detection element disposed on a substrate, and a yoke surrounding the substrate and allowing the magnetic detection element to be placed between both ends thereof.

A current sensor includes a first support configured to include a cutout portion, a first magnetic detector element group configured to be provided in the first support, a second support configured to include a cutout portion, and a second magnetic detector element group configured to be provided in the second support. The cutout portion includes a supporting surface supporting a current line. In the current sensor, when the current line conducting therethrough a current to be measured is attached, the first support and the second support are displaced in the circumferential direction of the current line and fixed, and the current line is supported by supporting surfaces, in different positions in the axis line direction of the corresponding current line.

Apparatus and methods for inspecting materials such as cylindrical and tubular members are disclosed. One apparatus includes a frame that supports a magnetic coil and a detector assembly, the detector assembly having one or more magnetic detectors adapted to be spaced a first distance from the material being inspected by one or more substantially frictionless members. This abstract allows a searcher or other reader to quickly ascertain the subject matter of the disclosure. It will not be used to interpret or limit the scope or meaning of the claims.

An antenna (3) of an electromagnetic probe used in investigation of geological formations GF surrounding a borehole WBH comprises a conductive base (31) and an antenna element (32). The conductive base (31) comprises an opened non-resonant cavity (33). The antenna element (32) is embedded in the cavity (33) and goes right through the cavity. The antenna element (32) is isolated from the conductive base (31). The antenna element (32) is coupled to at least one electronic module via a first 34A and a second 34B port, respectively. The electronic module operates the antenna so as to define a simultaneously superposed pure magnetic dipole and pure electric dipole.

The invention relates to a failure localizing method and device for underground electric cable, which includes time domain filter method and two-point difference speed trial method and the device for realizing above mentioned method. The time domain filter method includes failure point pulse discharging frequency; electromagnetic reception and sound wave reception; and the synchronous action of above three aspects; and sets the time period for closing discharging frequency. The two-point difference speed trial method places the magnetic detector as A and B points, samples and stores time data Ta and Tb at the two points; and works out the distance form the failure point to the measuring point through formula. The device includes electromagnetic amplification and comparison outputting circuit of received magnetic signal, the output circuit inputs the starting igniting pulse generated by the magnetic signal to the control pulse generating circuit, the pulse generating circuit generates magnetic wave through the potentiometer and closes the adjustable pulse width T1, and starts the adjustable pulse T2 of sound channel synchronous to it.

A magnetic detector includes a magnetoresistive element and a fixed resistor that are constituted from identical laminates. Hard bias layers are disposed on two sides of the fixed resistor each with a gap therebetween. The magnetoresistive element includes a magnetic layer, magnetization direction of which is variable; the fixed resistor includes a magnetic layer corresponding to the magnetic layer of the magnetoresistive element; and the magnetization direction of the magnetic layer of the fixed resistor is pinned by a bias magnetic field from the hard bias layers

The invention relates to a leakage magnetic detector of a reducing pipeline driven by a DC motor which mainly solves the problem that the existing pipeline detecting technology can not carry out safe, effective online pipeline defect detection with no damage to the pipeline on a long distance oil-gas conveying pipeline. The invention is characterized in that the detector includes a drive unit, a magnetization and running unit as well as a data collecting and analyzing unit; wherein, the gag bits, the permanent magnet and pole shoes of each sub-unit in the magnetization and running unit and the wall of the pipeline to be detected form a closed magnetic loop; a leakage magnetic signal generated in the loop is collected and analyzed by the data collecting and analyzing unit, thereby confirming the detect existed on the wall of the pipeline. The detector which can be driven by a motor or by a person has the characteristics of high detection precision and being capable of carrying out continuous scanning on the wall reducing of the detect without damage to the pipeline. Besides, the detector has a simple structure and a small size, has the reducing function in a certain range and can be suitable for the detection demands of the pipelines with different diameters.

A field programmable gate array based multi-channel flash ADC unit combined with a high speed multi-lane data communications channel / Ethernet-like modular intercommunication providing a complete but easily expandable high-speed data acquisition system. This apparatus and method permits high-speed pulse-shape digitalization allowing position resolution imaging of particles having a range of energies and is scalable to achieve the efficient capture of coincident data from large electromagnetic detector arrays.

Magnetic nanoparticles and methods for their use in detecting biological molecules are disclosed. The magnetic nanoparticles can be attached to nucleic acid molecules, which are then captured by a complementary sequence attached to a detector, such as a spin valve detector or a magnetic tunnel junction detector. The detection of the bound magnetic nanoparticle can be achieved with high specificity and sensitivity.

Apparatus for detecting the presence of magnetic elongated particles in a substrate, the base material of the substrate having magnetic properties substantially differing from the corresponding magnetic properties of the elongated particles. The elongated particles have such a long and thin form that their demagnetization factor N is smaller than {fraction (1 / 250)}, they have a diameter smaller than 30 micrometer, and they a magnetic saturation field greater than 100 A / m. Apparatus includes an emitter which emits an electromagnetic source signal of one or more particular base frequencies to the substrate (e.g., so that any magnetic elongated particles present go into a non-linear part of a B-H curve for at least part of cycle of the source signal). Apparatus also includes a detector that detects an electromagnetic detection signal emanating from the substrate for examining the detection signal for the presence of particular higher harmonics of the base frequencies or of any linear combination of the base frequencies or of the harmonics, particular higher harmonics being indicative of the presence of the magnetic elongated particles.

A position-data converter and a motor-drive control device are connected. The position-data converter receives two-phase, sine-wave analog signals da and db from two first magnetic detectors, respectively, and converts these signals da and db to position data. On receiving a positioning instruction, the motor-drive control device calculates the value of current, from the current position signal generated by the position-data converter. The permanent magnets incorporated in a linear motor are used as components of a linear scale, as well.

A magnetic detector includes a magnetoresistive element and an impact sensor. The magnetoresistive element has a plurality of element-constituent layers that are stacked and include a free layer having a magnetization direction that changes in response to a magnetic field to be detected by the magnetic detector. The impact sensor has a plurality of sensor-constituent layers that are made of materials the same as those of the element-constituent layers and stacked in the same order as the element-constituent layers. The plurality of sensor-constituent layers include an impact detecting layer corresponding to the free layer and having a magnetization direction that changes by an inverse magnetostrictive effect in response to distortion created in the impact detecting layer by an impact received by the magnetic detector. The impact detecting layer exhibits a greater amount of change in magnetization direction when the magnetic detector receives an impact, compared with the free layer.

A linear motor includes a slider unit having a magnet row in which plural permanent magnets are arranged in series so that the same poles are opposed to each other, a stator unit including electromagnetic coils for plural phases arranged along a movement direction of the slider unit, and plural magnetic detector devices, wherein the plural magnetic detector devices are provided in response to the phases of the electromagnetic coils for plural phases and detect magnetic flux radially extending in a direction perpendicular to the arrangement direction of the permanent magnets at boundaries between the permanent magnets of the magnet row and output signal waveforms for plural phases at phases equal to phases of waveforms of back electromotive forces generated in the respective electromagnetic coils for plural phases when the magnet row moves.

A magnetoelectric converting element is constructed by four or more magnetic resistance segments symmetrically arranged at a predetermined pitch with respect to the central line of a magnet perpendicular to the rotating direction of a magnetic moving body. The magnetizing direction of the magnet is set to the direction perpendicular to the direction opposed to the magnetic moving body. Further, 0.7P≦X≦P and P≦Y≦1.6P are set when the size of the magnet in the moving direction of the magnetic moving body is set to X and the size of the magnet in the direction opposed to the magnetic moving body is set to Y and the pitch of the magnetic resistance segments at both ends constituting the magnetoelectric converting element is set to P.

A gyro-stabilized automatic pet door is installed in a hinged door and is actuated by a magnet worn by a pet. The automatic pet door prevents unintended openings caused by the Earth's ambient magnetic field that may trigger a magnetic detector that responds to the magnet worn by the pet. A microelectromechanical systems gyro disposed on the hinged door generates a signal in response to a movement of the hinged door that engages a lockout timer overriding the signal from the magnetic detector and preventing the pet door from opening.

A rotation angle detecting device for a rotation object includes a rotor and a pair of permanent magnets and a magnetic detector disposed at the rotation axis of the rotation object. One of the permanent magnets has a circumferentially extending rut-shape concavity around the magnet detector or an axially extending elliptic columnar surface having a central portion thicker than others to make magnetic flux density in the vicinity of said magnetic detector constant in an axial or a diametrical direction.

An electronic apparatus (10) includes a main body (30), a lid (20) pivotably connected with a side of the main body, a magnetic detecting unit (40) and a magnetic shield member (28). The detecting unit includes a magnetic body (42) mounted on one of the main body or the lid and a magnetic detector (44) mounted on the other one of the main body or the lid, respectively. The magnetic body has a facing side (421) to face the magnetic detector. The magnetic detector detects a position of the lid according to a magnetic field intensity of the magnetic body. The magnetic shield member is disposed at a distance from the facing side and adjacent to a second side (422) of the magnetic body, to prevent the magnetic field from extending in the direction of the second side of the magnetic body.

The invention discloses a method for detecting the mechanical system of a drilling machine well mouth drill stem flux leakage detector. The mechanical system comprises a clamp arm device and a permanent magnetic detector device, wherein the clamp arm device can be closed in a cylindrical shape; an accommodating part is arranged in the clamp arm device, and a detector connecting seat is arranged in the accommodating part; and the detector device is arranged on the detector connecting seat. The detection method comprises the following steps: rendering the clamp arm device in an open state and positioning the clamp arm device at the well mouth position of the drilling machine; closing the clamp arm device and placing the upper part of the drill stem at the position of the well mouth of the drilling machine in the accommodating part; lifting the drill stem along the axial direction of the drill stem, and performing the flux leakage type flaw detection of the drill stem by using the permanent magnetic detector device; and opening the clamp arm device and withdrawing the clamp arm device from the well mouth of the drilling machine. The method can detect the drill stem without current and therefore can be directly used at the well mouth of the drilling machine and used conveniently; in addition, the detector device realizes the flux leakage flaw detection in a round trip process at the well mouth of a petroleum drilling machine, the detector is safe and explosion-proof and the manual washing of the drill stem is avoided.

A sit-up exercising apparatus includes at least one inclined abdominal board and a counting device mounted in the abdominal board. The counting device includes a support bracket secured in the abdominal board, a magnetic detector mounted on the support bracket, a movable member movably mounted on the support bracket and movable relative to the support bracket and the magnetic detector, a magnetic member mounted on the movable member to move with the movable member and movable to pass by the magnetic detector to produce multiple magnetic signals in the magnetic detector, and a transmission wire connected with the magnetic detector to transmit the magnetic signals in the magnetic detector. Thus, the counting device can count the times of the sit-up actions automatically so that the user needs not count the sit-up times by himself / herself during the exercising process.