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7385393 |
Magnetic field measuring apparatus capable of measuring at high spatial resolution
A condenser lens is incorporated into the end portion of a magnetic field measuring apparatus including a magneto-optical crystal. Alternatively, the end portion of the magnetic field measuring...
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7379523 |
Electromagnetic counter with built-in illumination means
An electromagnetic counter includes an electromagnetic counting mechanism in a frame, a plurality of number wheels at least one of which is configured to rotate through a predetermined angle in...
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7365533 |
Magneto-optic remote sensor for angular rotation, linear displacements, and evaluation of surface deformations
A system and method to detect angular rotation, linear displacement and/or surface deformations is presented. The method is based on the ability of a linear polarized light to interact with...
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7352172 |
Relative position detecting apparatus using magneto-resistors
The device according to the present invention comprises at least one magnetic field generating element, at least one magneto-resistor and at least one resistance-to-current converter generating a...
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7286228 |
Method and apparatus for measuring circularly polarized rotating electromagnetic wave using magnetic field
A method and apparatus for measuring a circularly polarized rotating electromagnetic wave using a magnetic field are provided. The method and apparatus are used to measure properties of a...
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7265845 |
Surface corrugation enhanced magneto-optical indicator film
A method of enhancing the conversion of magnetic field intensity and spatial data to optical data utilizes surface plasmon resonance combined with corrugated optical gratings of several types....
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7183765 |
Micro-position sensor using faraday effect
A micro-position sensor and sensing system using the Faraday Effect. The sensor uses a permanent magnet to provide a magnetic field, and a magneto-optic material positioned in the magnetic field...
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7173417 |
Eddy current sensor with concentric confocal distance sensor
A metrology instrument includes an eddy current sensor that is mounted to and concentric with a confocal distance sensor. By measuring the precise vertical placement of the eddy current probe with...
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7166997 |
Complex transverse AC magneto-optic susceptometer for determination of volume and anisotropy field distribution in recording media
A method and apparatus for determining volume and anisotropy field distribution of thin film granular material includes the use of a magneto-optic probe, a lock-in amplifier, and a computer. The...
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7084624 |
Magnetic sensor
The present invention provides a magnetic sensor capable of reproducing a magnetic record even if the size of a recorded magnetization is a minute one, directly reading a magnetization recorded on...
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7075286 |
Fiber-optic current sensor
An optical current sensor having a reflection interferometer ( 1, 10 ) has, in its fiber-optic lead ( 2 ), a polarization-maintaining first fiber branch ( 20 ) for two forward-traveling...
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7071687 |
Photomagnetic field sensor
A photo magnetic field sensor includes a Faraday rotator made of a paramagnetic material, a polarizer, an analyzer, a light-irradiating element, and a light-sensing element. The Faraday rotator is...
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7057792 |
Optical sensor unit for measuring current and voltage of high frequency
An optical sensor unit, free from electrical noise, includes a sensor case which has both lateral sides having high frequency connectors mounted thereon, and a metallic plate mounted inside the...
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7042558 |
Eddy-optic sensor for object inspection
A sensor enables simultaneous or sequential eddy current and optical reflectance measurements of conducting film by providing an eddy current inspection coil and a first and a second optical fiber...
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6972562 |
Near-field magneto-optical microscope
A device and method for mapping magnetic fields of a sample at a resolution less than the wavelength of light without altering the magnetic field of the sample is disclosed. A device having a...
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6927571 |
Apparatus for examining properties of objects
The invention relates to apparatus for examining magnetic properties of objects, in particular sheet material, such as bank notes ( 20 ). The apparatus comprises a magneto-optic layer ( 10 ) whose...
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6859510 |
Electromagnetic counter with built-in illumination device
An electromagnetic counter includes a case, an electromagnet, an anchor rotatable through magnetization and demagnetization of the electromagnet, and number wheels rotated by a predetermined angle...
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6812696 |
Apparatus and methods using mechanical resonators to enhance sensitivity in lorentz force magnetometers
A Lorentz Force magnetometer based on a mechanical resonator including a resonant, vibrating electrically conducting string or insulating fiber coated with an electrically conducting material and...
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6806704 |
Devices and methods for investigating the magnetic properties of objects
The invention relates to apparatuses and a corresponding method for examining magnetic properties of objects, in particular sheet material, such as bank notes ( 20 ). The apparatuses comprise a...
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6788051 |
Method and system of spectroscopic measurement of magnetic fields
There is disclosed a method and apparatus for spectroscopically sensing a man-made, terrestrial or atmospheric magnetic field emanating from an object that includes receiving a radiance emission...
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6756781 |
Sensor for optically measuring magnetic fields
Described are improved transmissive magneto-optical sensors that may be used to determine the magnitude and phase of a magnetic field surrounding a conductor, and when in contact with the...
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6717713 |
Variable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of a light signal
An apparatus which attenuates a light signal polarized in a first direction. The apparatus includes a polarization rotation unit and an output unit. The polarization rotation unit rotates the...
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6714007 |
Optically powered resonant integrated microstructure magnetic field gradient sensor
A device 10 for sensing a magnetic field gradient using an optically powered resonant integrated microstructure (O-RIMS). The O-RIMS comprises a microbeam 11 having a resonant frequency, a...
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6690001 |
THz pulse measurement with an optical streak camera
A method and apparatus for measuring electromagnetic pulses as a function of time. Radiation measurement, including measurement of single-shot, free-space terahertz femtosecond pulses, is realized...
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6674281 |
Method for measuring magnetic field based on electro-optic probing technique and measuring electric field based on magnetic probing technique
The present invention provides a method for measuring both magnetic and electric fields of a DUT via an electro-optic probing technique at the same time. Also, the present invention provides a...
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6670810 |
System and method for distributed monitoring of surroundings using telemetry of data from remote sensors
A system and method for gathering and analyzing data captured from one or more remote sensing units positioned in the field. Remote sensing units preferably utilize optical sensors. Power to...
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6646777 |
Optical isolator with improved mounting characteristics
An optical isolator includes a first magnetic polar source having a first magnet axis, a second magnetic polar source having a second magnet axis parallel to the first magnet axis, and an optical...
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6639403 |
System and method for sensing magnetic fields based on movement
A method and system for sensing magnetic fields using an AC current carrying wire which vibrates or moves in the presence of a magnetic field. The system uses the wire movement to determine one or...
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6630819 |
Magneto-optic current sensor
An optical current transducer configured to sense current in the conductor is disclosed. The optical current transducer includes a light source and a polarizer that generates linearly polarized...
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6594068 |
High switching speed digital faraday rotator device and optical switches containing the same
In all-optical networks, high speed optical switching and routing becomes one of the most important issues for interconnecting the transport network layers. This invention describes novel...
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6593739 |
Apparatus and method for measuring magnetization of surfaces
An optical apparatus and methods for efficiently determining the magnetization of a material at very high optical resolution are disclosed. Individual components of the magnetization may be...
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6573700 |
Method of characterizing free-space radiation using a chirped optical pulse
Characterization of free-space electromagnetic energy pulses ( 15 ) using a chirped optical probe beam is provided. An electro-optic or magneto-optic crystal ( 14 ) is positioned such that the...
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6534977 |
Methods and apparatus for optically measuring polarization rotation of optical wavefronts using rare earth iron garnets
Described are the design of a rare earth iron garnet sensor element, optical methods of interrogating the sensor element, methods of coupling the optical sensor element to a waveguide, and an...
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6528993 |
Magneto-optical microscope magnetometer
A magneto-optical microscope magnetometer capable of simultaneously measuring a hysteresis loop and activation magnetic moment of a submicrometer-scale local area (about 0.3×0.3 μm). An...
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6515467 |
Method and system for optically detecting an electric current by means of light signals having different wavelengths
The method and system serve to optically detecting an electric current with an extended measurement range. To that end, two light signals having different wavelengths pass through a Faraday...
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6501269 |
Vector kerr magnetometry
A system and method for realizing vector Kerr magnetometry are disclosed. The system enables simultaneous longitudinal and transverse Kerr effect measurements at each point on a sample surface. An...
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6498654 |
Optical proximity detector
A proximity detector for detecting the position of a magnetic target having a transceiver module with a light emitting source, an optical detector, and a 2×2 optical coupler joining the light...
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6495999 |
Method and device for measuring a magnetic field with the aid of the faraday effect
A magnetic field is measured with the aid of the Faraday effect. Light is coupled into a Faraday element subjected to the magnetic field, the light having a linearly polarized first component at a...
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6462856 |
Method and apparatus for modulating an optical signal using polarization
A low-rate data transmission system and method are disclosed that use the Faraday effect to modulate the polarization state of light traveling in an optical fiber. The resulting change in...
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6462539 |
Magnetic sensor with faraday element
Light with a plane of polarization rotated during transmission is converted to parallel light by a collimating lens. The parallel light is transmitted through a first birefringent plate to be...
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6448766 |
Method of imaging a magnetic field emanating from a surface using a conventional scanning force microscope
Magnetic characterization of the magnetic field emanating from an RWH device is presented using a magnetostrictive layer as a probe between the device and the scanned SFM tip. The findings suggest...
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6437885 |
Semiconductor sensor for optically measuring polarization rotation of optical wavefronts using rare earth iron garnets
Described are the design of a rare earth iron garnet sensor element, optical methods of interrogating the sensor element, methods of coupling the optical sensor element to a waveguide, and an...
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6434285 |
Fiber optic difference current sensor
A sensor that measures a difference of currents at two locations along a conductor. The sensor uses two fiber optic current sensors. One current sensor at the first location measures current and...
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6433543 |
Smart fiber optic magnetometer
A smart magnetometer which includes at least one cantilevered magnetostrictive/optical fiber structural bonded composite in a vibrationally isolated housing allowing an optical signal to be...
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6417916 |
Method and apparatus for examining test pieces
A measurement system is used in particular to detect defects in test objects. To that end, the test object is lighted from a lighting unit that includes a plurality of laser diodes. The beam cones...
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6414473 |
Electro-optic/magneto-optic measurement of electromagnetic radiation using chirped optical pulse
Characterization of free-space electromagnetic energy pulses ( 15 ) using a chirped optical probe beam is provided. An electro-optic or magneto-optic crystal ( 14 ) is positioned such that the...
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6404190 |
Optical magnetic field sensor probe
An optical magnetic field sensor probe for detecting a magnetic field to be measured as an output light intensity, by disposing a polarizer, a magneto-optical device, and an analyzer mutually...
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6396263 |
Devices and methods for mapping complex magnetic fields through discrete magnetic potential measurements
A magnetic potential mapping device is provided by placing a planar polarized light source near an optically active fiber element traversing a magnetic field, so constructed that rotating planar...
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6366075 |
Fiber optic, current measuring devices and method
The present invention relates to a device for measuring a current in a magnetic field which includes a glass article wherein the glass may be an oxyfluoride glass or a bismuth oxide glass having a...
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6346810 |
Electric motor control using temperature and magnetic field strength variation of its stator liminations
A sensor for facilitating the measurement of temperature and magnetic field is described. The sensor comprises an optical cable having a distal end encompassed in a sheath of giant magnetoresistive...
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