Magneto-optic current field sensor with sensitivity independent of verdet constant and light intensity.
نویسندگان
چکیده
منابع مشابه
Intensity and phase measurements of nondiffracting beams generated with a magneto-optic spatial light modulator.
Nondiffracting beams are of interest for optical metrology applications because the size of the beam does not change as the beam propagates. However, accuracy can be increased if the diameter of the beam is smaller. One technique for accomplishing this is to use the dark axial intensity profile associated with a higher-order nondiffracting Bessel function beam. We generate these higher-order Be...
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A highly sensitive fiber optic current sensor using terbium doped fiber is presented. The Verdet constant of the terbium doped fiber at 1300nm is found to be 19.5μrad/A using both a polarimetric and interferometric type sensor. Measurements on a Sagnac-loop sensor using 10cm of terbium doped fiber placed inside a solenoid show over 40dB of open loop dynamic range as well as a minimum detectable...
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Magneto-Optic Imaging (MOI) is a relatively new nondestructive evaluation modality that provides real time images of surface and subsurface features. In this technique, flux leakage maps associated with applied currents are recorded and monitored to locate material defects. Various factors affect the sensitivity of nondestructive evaluation using MOI including structure geometry, instrumentatio...
متن کاملDesign and Development of a Magneto-Optic Sensor for Magnetic Field Measurements
A magneto-optic sensor is developed using a Terbium Doped Glass (TDG) element as a Faraday rotation sensor and optical fiber as light transmitting and receiving medium. Online LabView based application software is developed to process the sensor output. The system is used to sense the magnetic field of a DC motor field winding in industrial environment. The sensor output is compared with the ma...
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The magneto optic sensor is very fast (at the speed of light), sensitive, non-contact and EMI (electromagnetic interference) proof in operation. It senses magnetic flux density by rotating the plane of polarization of the incident beam of light passing through it based on Faraday Effect. The amount of rotation depends on the property (Verdet Constant) of the magneto-optic element and the magnet...
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ژورنال
عنوان ژورنال: Journal of the Magnetics Society of Japan
سال: 1990
ISSN: 0285-0192
DOI: 10.3379/jmsjmag.14.391