SARITA KUMARI - Academia.edu (original) (raw)

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Papers by SARITA KUMARI

A magneto-optic sensor is developed using a Terbium Doped Glass (TDG) element as a Faraday rotati... more 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 magnetic flux density variation obtained with a calibrated Hall Magnetic sensor (Gauss Meter). A linear variation of sensor output over wide range of current passing through the field winding is obtained. Further the results show an improved sensitivity of magneto-optic sensor over the Hall sensor.

A co-doped Bi-substituted rare-earth iron garnet single crystal YbBi:YIG was grown from high temp... more A co-doped Bi-substituted rare-earth iron garnet single crystal YbBi:YIG was grown from high temperature solution, and was used ®rst time for magneto-optic optical ®ber current sensors. The crystal has the speci®c Faraday rotation angle À4048 cm À1 , magneto-optic ®gure of merit 25.88 dB À1 , saturation magnetic ®eld 1400 Oe, and temperature coef®cient 4X2 Â 10 À4 K À1 (at room temperature, l 1X55 mm). It has larger Faraday rotation angle and magneto-optic ®gure of merit and lower temperature sensibility than pure YIG. A laboratory prototype sensor was established using the YbBi:YIG crystal as Faraday rotator element, and its sensing performance was tested under a 50 Hz factory frequency current. The tested results showed that the sensor system had high accuracy, sensitivity and good linearity. #

A magneto-optic sensor is developed using a Terbium Doped Glass (TDG) element as a Faraday rotati... more 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 magnetic flux density variation obtained with a calibrated Hall Magnetic sensor (Gauss Meter). A linear variation of sensor output over wide range of current passing through the field winding is obtained. Further the results show an improved sensitivity of magneto-optic sensor over the Hall sensor.

A co-doped Bi-substituted rare-earth iron garnet single crystal YbBi:YIG was grown from high temp... more A co-doped Bi-substituted rare-earth iron garnet single crystal YbBi:YIG was grown from high temperature solution, and was used ®rst time for magneto-optic optical ®ber current sensors. The crystal has the speci®c Faraday rotation angle À4048 cm À1 , magneto-optic ®gure of merit 25.88 dB À1 , saturation magnetic ®eld 1400 Oe, and temperature coef®cient 4X2 Â 10 À4 K À1 (at room temperature, l 1X55 mm). It has larger Faraday rotation angle and magneto-optic ®gure of merit and lower temperature sensibility than pure YIG. A laboratory prototype sensor was established using the YbBi:YIG crystal as Faraday rotator element, and its sensing performance was tested under a 50 Hz factory frequency current. The tested results showed that the sensor system had high accuracy, sensitivity and good linearity. #

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