Signal-to-noise rate increasing methods for microbolometric infrared image sensor

In this paper, several signal-to-noise rate increasing methods are proposed for microbolometric infrared image sensor. By reviewing the basic working principle of microbolometer, we have obtained the signal respond expression of a typical structure microbolometer and given out the noise characteristics of the microbolometer. Additionally, the universal infrared responding signal process is analyzed and the passing bandwidth of infrared responding signal is expressed. Based on the infrared responding signal and noise frequency characteristics in the passing bandwidth, these signal-to-noise rate increasing methods are proposed for microbolometric infrared focal plane arrays, which have been successfully applied for infrared image sensors in our laboratory.