Title :
Fundamental study of optical probe current sensor using Kerr effect of single magnetic domain film
Author :
Sonehara, Makoto ; Otani, Norihisa ; Goto, Tetsu ; Kikuchi, Yutaka ; Sato, Takao ; Yamasawa, Kiyohito ; Miura, Yukiya ; Asanuma, K.
Author_Institution :
Spin Device Technol. Center, Shinshu Univ., Nagano, Japan
Abstract :
An optical probe current sensor using a Kerr effect of an Fe-Si/Mn-Ir exchange-coupled film has been investigated. The optical sensing technique has the advantage of no induced noise from the external electromagnetic interference. In addition, since the proposed method using the Kerr effect of single domain exchange-coupled magnetic thin film utilizes only magnetization rotation, the Barkhausen noise due to a domain wall pinning can be excluded. A fabricated optical probe current sensor consisting of He-Ne laser, Fe-Si/Mn-Ir exchange-coupled film, beam splitter, pin-PD and differential amplifier, exhibited a current sensing bandwidth of 10 kHz and a sensitivity of 2.26 V/A. By using the fabricated optical probe current sensor, the current sensing for PWM inverter motor has been demonstrated.
Keywords :
Barkhausen effect; PWM invertors; antiferromagnetic materials; electric current measurement; exchange interactions (electron); ferromagnetic materials; fibre optic sensors; iridium alloys; iron alloys; magnetic domain walls; magnetic thin films; magneto-optical effects; manganese alloys; optical Kerr effect; optical beam splitters; silicon alloys; Barkhausen noise; FeSi-MnIr; Kerr effect; bandwidth 10 kHz; beam splitter; differential amplifier; domain wall pinning; exchange-coupled film; external electromagnetic interference; optical probe current sensor; pin-PD; single magnetic domain film; Electromagnetic interference; Kerr effect; Magnetic domains; Magnetic films; Magnetic sensors; Nonlinear optics; Optical films; Optical noise; Optical sensors; Probes;
Conference_Titel :
Sensors, 2009 IEEE
Conference_Location :
Christchurch
Print_ISBN :
978-1-4244-4548-6
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2009.5398373
