Bolometer Detector Modeling and its Performance Indexes

Abstract

Bolometer detector is one of thermal detectors. In this research the essential concepts and parameters are included which cover the main types of bolometer detectors. But the actual values of parameters used here in simulation are adopted from [7] for semiconductor bolometer. This detector operates for all optical wavelengths of different sources. From analysis and results obtained, it is shown that minimum and maximum values of specific Detectivity D* for cryogenic temperatures from 0.5 K to 10 K are 0.25~10 / and 5 ~ 10 / , respectively and the values between them when the incident radiation frequency is 100 Hz.. It is seen that for frequency greater than 1Hz, the specific Detectivity increases rapidly which means that the bolometer detector will respond for high frequencies in a manner more speed than that of low frequencies. It is found that as the value of ƒÑth is increased, the temperature change in detector sensor is decreased. That is decreasing ƒÑth enhance the performance of bolometer detector. It is found that the responsivity of this detector follow its output voltage which in turn follow the bolometer temperature change.

Keywords

• bolometer detector
• thermal time constant
• nep
• voltage response
• responsivity
• or detectivity