Abstract
Thermal responses (thermal time constant τ and responsivity RV of resistance changes) to infrared radiation were measured for SiC-fiber thermistors. Four kinds of commercial SiC fibers (Nicalon) with different resistivities (0.37-3.0kΩ·cm) and diameters (7-14μm) were used as the thermistors. The thermal time constants decreased with decreasing length of the fibers (distances between electrodes) in a series of thermistors using the same kind of fibers. In a thermistor made of separately arranged fibers with a low resistivity (0.37kΩ·cm) and of a small number (n=22), a small thermal time constant of 11 msec was obtained. A relation of τ∝H⋅RV (H: heat capacity) was derived theoretically, and measured values in the thermistors of separately arranged fibers satisfied above relation. It was suggested that the thermal time constant can be controlled by selecting SiC fibers with adequate resistivity and diameter and the shape of a thermistor (numbers and length of fibers).
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