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| Number | Title | Issue Date |
| 4771240 | Magnetic field sensor with magnetic field-dependent resistor In a magnetic field sensor comprising at least one magnetic-field-dependent resistor disposed in the vicinity of an outer side of a housing that is open on at least one side and further comprising a permanent magnet that is adjacent to said magnetic-field... | 09/13/1988 |
| 4767989 | Mounting arrangement for magnetic field detector A magnetic field detector has a sensor arrangement which is disposed in a housing and includes a plurality of stripe-magnetic-field-dependent resistors arranged on the underside of a dielectric support. A permanent magnet is oriented perpendicularly to th... | 08/30/1988 |
| 4745363 | Non-oriented direct coupled gear tooth sensor using a Hall cell A non-oriented direct coupled sensor for gear teeth or similarly shaped discontinuities of a ferrous magnetic or magnetic target uses a single magnet and a direct coupled Hall cell integrated circuit to detect the presence or absence of gear teeth. The se... | 05/17/1988 |
| 4739273 | Apparatus for detecting substantially longitudinal flaws in the end area of a tubular member using magnetic excitation and a scanning sensor An apparatus for detecting substantially longitudinal flaws in the end area of a tubular member is disclosed. The apparatus comprises magnetizing-detection units, means for moving-said units along a helical path about the surface of the end area of the tu... | 04/19/1988 |
| 4727321 | Method and device for magnetic and ultrasonic testing of ferro-magnetic objects The subject of the invention is a method and a device for non-destructive testing of ferromagnetic bodies (1) for structural faults. The bodies (1) are magnetized. Structural faults cause changes in the magnetic field pattern which are measured with magne... | 02/23/1988 |
| 4692698 | Method and device including a bed of ferromagnetic fibers and magnetic flux sensor for measuring the amount of magnetic particles on a liquid An improved method and device for measuring magnetic particles in a liquid wherein a known amount of liquid is contacted with a bed of ferromagnetic fibers maintained in the magnetic field of a magnet with sufficient strength to substantially completely m... | 09/08/1987 |
| 4692702 | Device with two generators for measuring the gradients of magnetic fields The object of the invention is a device with two Hall generators (12, 14) for measuring the gradients of magnetic leakage fields in the non-destructive testing of materials. The two Hall generators (12, 14) are arranged at a distance from each other with ... | 09/08/1987 |
| 4668913 | Constant flux magneto resistive magnetic reluctance sensing apparatus Disclosed is an improved method and apparatus for sensing magnetic reluctance variations. The invention may be used for magnetic ink character reading, such as is employed on bank checks, or for any of a variety of magnetic reluctance pickup applications.... | 05/26/1987 |
| 4665362 | Magnetic-type of analog distance sensor having a hall effect sensing element The invention relates to an analog non-contact distance sensor which includes a fixed stationary annular magnetized armature. The stationary armature member is provided with an air gap into which is disposed an element which is sensitive to a magnetic fie... | 05/12/1987 |
| 4625166 | Method for measuring magnetic potentials using hall probes The present invention concerns devices with probes for measuring magnetic potentials. Potential differences between two points of a material in a magnetic field are measured with a plurality of Hall probes arranged on a curved line which connects the poin... | 11/25/1986 |
| 4625167 | Flaw imaging in ferrous and nonferrous materials using magneto-optic visualization A method for the direct visualization of surface and near surface cracks, voids, flaws, discontinuities, etc. in materials is disclosed. The detection of flaws or the like is accomplished by the visualization of the static and/or dynamic magnetic fields, ... | 11/25/1986 |
| 4588348 | Robotic system utilizing a tactile sensor array A movable part of a robot, such as the fingers of the robot hand, are provided with an array of tactile elements mounted on a substrate. Each element includes a magnetic dipole embedded in a compliant medium on one side of the substrate and a magnetic sen... | 05/13/1986 |
| 4573013 | Magnetic inspection of reinforcing steel rods in prestressed concrete A method of inspecting the reinforcing members in prestressed concrete beams by generating a magnetic field close to the beam and measuring the field by means of a Hall effect sensor located between the pole pieces of the magnet. A partial or total break ... | 02/25/1986 |
| 4538108 | Testing arrangement for ferromagnetic bodies including magnetic field detectors extending between two pairs of poles of magnetic field generators spaced longitudinally along the body An apparatus for non-destructively testing ferromagnetic bodies to determine structural irregularities by means of magnetization of the respective object, comprises detectors for magnetic fields arranged close to the surface of the body, by which detector... | 08/27/1985 |
| 4535289 | Device for measuring a position of a moving object A device for measuring the position of a moving body. A detected member made of magnetic material is secured to the moving body and an E-shaped magnet is arranged adjacent the measured member transverse to the direction of motion. A Hall IC for converting... | 08/13/1985 |
| 4524932 | Railroad car wheel detector using hall effect element A Hall effect element, incorporated into an integrated circuit unit with temperature compensation, voltage regulation, and amplification, is mounted on top of a permanent magnet made of ceramic material with the critical Hall axis aligned with the magnet ... | 06/25/1985 |
| 4518919 | Detecting device for detecting a magnetic strip embedded in a sheet A paper note containing a magnetic strip is transported along a path and adjacent a magnetic detector. This magnetic detector comprises a magnet and a magnetic resistance element provided in the magnetic field generated by the magnet. When the magnetic st... | 05/21/1985 |
| 4503393 | Method and apparatus for detecting flaws in the threaded end of an elongate member using electromagnetic excitation and an automated scanning sensor Apparatus for detecting flaws in the threaded end of a ferromagnetic pipe is disclosed. The apparatus comprises means for applying a magnetic force to produce a field generally axially through the threaded end of the pipe, first and second means adjacent ... | 03/05/1985 |
| 4490674 | Rotational angle detection device having two magnetoresistive sensing elements A rotational angle detection device having two magnetoresistive sensing elements positioned at a 45° angle with respect to each other senses the rotary position of a permanent magnet. Sine and cosine waves are applied to first and second bridge circuits ... | 12/25/1984 |
| 4488112 | Hall effect device test circuit A Hall effect device test circuit which detects Hall effect device operate and release point failures. A magnetic field circuit, a voltage switching circuit, a comparison circuit, a retriggerable monostable multivibrator circuit and a visual indicator cir... | 12/11/1984 |
| 4481469 | Rotary speed sensor with Hall generator responding to tangential component of magnetic field To determine the rotary speed of a toothed element (1), for example the starter gear of an internal combustion (IC) engine, or a toothed wheel coupled to a wheel of a vehicle for evaluation of the speed, and change in speed thereof, for use in a brake ant... | 11/06/1984 |
| 4468619 | Non-destructive detection of the surface properties of ferromagnetic materials A method of and apparatus for non-destructive investigation of the surface properties of a body of ferromagnetic material such as a pipeline in which a non-saturating source of magnetic flux is placed adjacent to said surface to create a magnetic circuit ... | 08/28/1984 |
| 4408160 | Acoustic Barkhausen stress detector apparatus and method This disclosure is directed to an acoustic Barkhausen stress detector apparatus and a method of obtaining measurements of stress in or determination of the microstructure of ferromagnetic materials. In the preferred and illustrated embodiment, stress or m... | 10/04/1983 |
| 4397560 | Photometer with microtray well position indicator A photometer for sensing the optical density of a plurality of liquids located in a microtray provided with a rectilinear array of wells is provided with a detent device for locating each well in alignment with the photodetector and a plurality of magnets... | 08/09/1983 |
| 4302754 | Wear particle disintegrator monitor An electromagnetic system is provided to monitor the activity of a ferrous debris detector of the type which uses electric discharges to automatically disintegrate magnetically concentrated accumulations of micron sized wear particles in hydraulic systems... | 11/24/1981 |
| 4296376 | Probe for sensing characteristics of electrical devices utilizing a magnetic switch sensor biased by an encircling magnetic biasing means A probe for sensing energizations of electrical components and particularly the energization of a relay or solenoid, the probe utilizing a magnetic switch as a sensor, a light-emitting diode as an indicator and a battery as a power source, the elements en... | 10/20/1981 |
| 4286216 | Ferromagnetic resonance probe and method for flaw testing in metals A probe and method for detecting surface flaws in metals. The probe operates at microwave frequencies and uses a ferromagnetic resonator. The resonator experiences a frequency shift when brought into proximity with a metal because of the perturbations of ... | 08/25/1981 |
| 4207519 | Method and apparatus for detecting defects in workpieces using a core-type magnet with magneto-sensitive detectors A method is proposed by which defects in workpieces are detected magnetically, which method comprises the following steps being performed concurrently: scanning the test surface of a workpiece utilizing magneto-sensitive elements; magnetizing the workpiec... | 06/10/1980 |
| 4182985 | Magnetoresistor bridge probe for locating the position of a magnetic tube support sheet of a nonmagnetic heat exchange conduit Apparatus for locating the position of at least one magnetic member relative to a nonmagnetic member includes a probe assembly movably disposed within the nonmagnetic member and including a nonmagnetic head having a pair of spaced permanent magnets mounte... | 01/08/1980 |
| 4100491 | Automatic self-cleaning ferromagnetic metal detector A ferrous metal detecting apparatus is disclosed for detecting metal particles in a flowing fluid, such as engine oil. The detecting apparatus has soft-iron pole pieces with a bridging gap therebetween. The soft-iron pole pieces are electrically insulated... | 07/11/1978 |
| 4096437 | Magnetic testing device for detecting loss of metallic area and internal and external defects in elongated objects A magnetic testing device for detecting defects in elongated objects is disclosed. The testing device comprises a permanent magnet assembly having poles adapted to be spaced apart in the longitudinal direction of an elongated object for inducing a longitu... | 06/20/1978 |
| 4088946 | Magnetic bridge transducer formed with permanent magnets and a hall effect sensor for identifying the presence and location of ferromagnetic discontinuities within or on a tubular specimen A transducer for identifying and quantitatively measuring the presence and location of ferromagnetic material, which is specifically suitable for remotely mapping ferromagnetic deposits on pressurized water reactor steam generator tubing. The transducer e... | 05/09/1978 |
| 4087749 | Method and apparatus for normalizing the outputs of sequentially scanned magnetic flaw detectors A method and apparatus for detecting flaws in conduits or the like which prises positioning an annular array of Hall-effect devices transversely around the conduit, applying an electric current to the conduit to flow longitudinally therethrough so as to ... | 05/02/1978 |
| 4075671 | Automatic AC biasing of a magnetoresistive element Two magnetoresistive (MR) elements are connected with two matched impedance elements in a bridge arrangement for sensing magnetic flux manifesting information recorded on magnetic media. An alternating current (AC) bias is applied to the bridge's input, a... | 02/21/1978 |
| 4066962 | Metal detecting device with magnetically influenced Hall effect sensor A solid state Hall effect sensor is disposed between two magnets having their fields in quadrature with flux from the magnets at least partially cancelling in the Hall element to thereby enable a ferrous element relatively movable with respect to the magn... | 01/03/1978 |
| 4021728 | Magnetic field sensing apparatus for sensing the proximity of a member having high magnetic permeability without requiring an external field source Apparatus is provided for producing an output signal upon sensing the proximity of a member having relatively high magnetic permeability. The apparatus includes a magnetoresistive element which is comprised of an insulating substrate upon which first and ... | 05/03/1977 |
