低キュリー点PTCサーミスタの赤外線検出特性

抄録

Infrared (IR) sensing properties were investigated for a positive temperature coefficient (PTC) thermistor with a composition of Ba_0.621Sr_0.336Ca_0.040La_0.003TiO₃+2mol% SiO₂+0.05mol% MnO (the Curie point was 25°C), operated under the self-regulating heating conditions. The results were compared with those of a detector element with the Curie point of 122°C. The sensitivity operated under the self-regulating heating conditions measured at various ambient temperatures in the range from 0° to 30°C was several times larger than that of the detector element with the Curie point of 122°C. Lowering the operating temperature of the detector by using a PTC thermistor with a low Curie point was shown to be effective for improving the sensitivity.