Title :
A new environmental monitor sensor utilizing thick-film magnetic semiconductor
Author :
Seki, K. ; Shida, J. ; Matsuki, H. ; Murakami, K.
Author_Institution :
Dept. of Electr. Eng., Iwate Univ., Morioka, Japan
fDate :
9/1/1990 12:00:00 AM
Abstract :
The preparation of a thick-film magnetic semiconductor (TMS) using ferrite powder and a ruthenium compound is described, and the application of its properties to a multipurpose sensor is considered. The TMS was sintered at a relatively low temperature and showed ferromagnetic and semiconducting properties which were dependent on the temperature, humidity, and gas concentration. The TMS is a versatile device: a temperature-sensitive magnetic core, a thermistor, and a varistor can be added to ordinary resistance and capacity elements. Considering these characteristics, the TMS can be used as a temperature/humidity/gas sensor for a modulated environmental monitor. A novel temperature-signal readout method due to the magnetic head is also introduced for the TMS pattern sensor
Keywords :
electric sensing devices; ferrite devices; gas sensors; humidity measurement; magnetic semiconductors; monitoring; temperature measurement; thick film devices; Mn1-xCuxFe2O4 -RuO-PbO-SiO2-B2O3; TMS pattern sensor; environmental monitor sensor; ferrite powder; ferromagnetic properties; gas concentration; gas sensor; humidity; humidity sensor; magnetic head; sintering; temperature sensor; temperature-sensitive magnetic core; temperature-signal readout method; thermistor; thick-film magnetic semiconductor; varistor; Ferrites; Humidity; Magnetic semiconductors; Magnetic sensors; Monitoring; Powders; Sensor phenomena and characterization; Temperature dependence; Temperature sensors; Thick film sensors;
Journal_Title :
Magnetics, IEEE Transactions on
