電気学会論文誌C(電子・情報・システム部門誌)
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
零磁界形磁界センサ
園田 敏勝上田 隆三
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ジャーナル フリー

1990 年 110 巻 11 号 p. 699-706

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This paper presents a new magnetic field sensor named zero magnetic field type after its detection principle. The detection principle is as follows: When the magnetic field level in the core used as a sensor is shifted by an unknown field to be detected, a controlled field is so superimposed in the opposite direction to the unknown field that the original zero magnetic field state is restored. Then the unknown field can easily be detected from the controlled field. Consequently, the detection characteristics are not affected with the geometrical dimension, magnetization curve and demagnetization effect of the core used as a sensor, and moreover, the temperature variation of the core, the winding resistance and the inductance do not also directly degrade the detection performances.
This paper certifies that the proposed sensor certainly has such excellent properties. In addition, the followings are clarified: (i) The upper limit of the detectable range does not exist in principle; (ii) The detection accuracy is 0.02% to the full scale 20 kA/m and realizes the order of 4×10-4%/°C for the temperature variation of -76°C to 300°C; (iii) The magnetization property required to the core used as a sensor is that it has as sharply a rectangular B-H loop as possible; (iv) As a result, the design of the sensor is greatly simplified.

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