Development of heat-resistant magnetic sensor

Takaya, Shigeru  ; Arakawa, Hisashi*; Keyakida, Satoshi*

A hear-resistant magnetic sensor was newly developed. Permendur, a high Curie temperature material, was employed as a magnetic core material, and magnetic detection principle was modified by taking the magnetic property of Permendur into account. It was shown that sensor output is linear with respect to external magnetic field at least up to 500C, though sensitivity decreased slightly with temperature. Effect of oxidation of magnetic core was investigated, but it was concluded that oxidation of magnetic core is not major factor of decreasing in sensitivity.