Noise analysis of infrared detectors

Pyroelectric infrared detectors convert the changes in incoming infrared light to electric signals. Pyroelectric materials are characterized by having spontaneous electric polarization, which is altered by temperature changes as infrared light illuminates the elements. Since our sensor series uses this effect they can be used at ambient temperature even in the presence of thermal noise. By choosing appropriate infrared receiving electrodes, they serve a wide range of applications. Sometimes pyroelectric infrared detectors generate a false alarm. They include thermal resistor and FET device which can be a source of random signals. This paper deals with the measurement of output and transfer characteristics and voltage low noise spectral density. By the help these characteristics we can evaluate detectors and reduce false alarms.