感温磁性半導体を用いた2出力温・湿度計測モジュール

抄録

The temperature-sensitive magnetic semiconductor (TMS) is one kind of ferrite which is called a temperature-sensitive magnetic core whose magnetic and electrical properties both exhibit a marked temperature dependence.
The useful TMS as a measuring and controlling element can be created the various Curie temperatures over a wide range and keeps the ferromagnetic property below its Curie temperature. The saturated magnetic flux density and resistance of a TMS are characterized by the decreasing tendencies with the rise in temperature. The former vanishes at its Curie temperature and the later approaches a low value. But it is not well known that the temperature dependent resistance has nearly the same properties as a semiconductor.
In this paper, the authors describe the semiconducting properties of a TMS including its application to the modulated magnetic and electrical sensors.
The semiconducting TMS such as a thermistor exhibits the humidity dependence which causes the resistance to decrease with the rise in humidity because of a variable conductivity due to the absorption and emission of the moisture. The reluctance on the magnetic property has the temperature dependence, but the humidity independence.
After the magnetic and electrical sensors constructed with a single TMS detect the temperature/humidity inputs at the same time, it separates automatically both inputs and can individually and simultaneously send out more than one signal.
Therefore, the TMS can be regarded as a multi-ability magnetic semiconductor device, having the effect of adding a thermistor to the temperature-sensitive magnetic core, and these characteristics are expected a practical use in the field of the measurement instrument.
We investigated the fundamental experiment on a TMS and the voluntary measurement module for the temperature and humidity.