Abstract:
Abstract
The main idea of this thesis is to design and fabricate an infra-red
detector, specially the disk type of NTC thermistor. And to test it’s operation
and response to different levels of laser power .
The challenge of the fabrication arise from the chemical, physical and
electronic thermistor features. In order to get perfect and good response, a
certain semiconductor oxides ratio prepared and milled with special size and
shape under tones of pressure. Then sintered above thousand of temperature
degrees, and finally coated and attached with the legs to get the thermistor.
An electronic circuit consist of some amplifiers, comparator and
reference voltage was used to test the disk thermistor operation.
Finally different levels of Nd:YAG laser power were used to test the
fabricated thermistors. The results are very promising and the best ratios of
the mixture could be easily determined.
