Detector pixel in dielectric bolometer mode based on ferroelectric thin film capacitors for uncooled infrared image sensor

摘要

A new type of detector pixel circuit operated in a dielectric bolometer mode for infrared image sensor has been developed. The circuit features that change in dielectric constant against temperature is detected through that in capacitance of ferroelectric thin film capacitor such as BST (Ba_1-xSr_xTiO_3). Our proposed circuit is a capacitor-capacitor serially connected ciruit, where at least one capacitor is composed from a BST ferroelectric thin film. In PSPICE circuit simulations, it is found that when a relative capacitance change in the BST ferroelectric capacitor, which beginning value is 0.10nF, of the detector circuit is 1/100, the output level is about 25mV.