Basic Characteristics of Optical Probe Current Sensor and Current Measurement Flowing through Bonding Wire of SiC Power Devices

The authors have developed an optical probe current sensor based on the Faraday effect of Bi:RIG crystals as a new current sensor that can replace conventional current sensors. This paper describes the measurement results of the basic characteristics of the developed current sensor and the actual in-situ measurement results of a bonding wire part of a SiC power semiconductor with a diameter of 300
$\mu \mathrm{m}$
.