Signal readout for pyroelectric detector based on relaxor ferroelectric single crystals

Abstract

Relaxor‐based ferroelectric single crystals, such as (1 − x)Pb(Mg1/3Nb2/3)O3xPbTiO3 (PMNxPT, or PMNT) single crystals, exhibit large pyroelectric response, low thermal diffusivity, and high temperature stability. To fabricate high performance infrared detectors with relaxor‐based single crystals, the related readout circuit was investigated to increase signal‐to‐noise ratio, and 8 × 1 CMOS readout circuit is fabricated to gain very weak current, which provides a solution for uncooled large focal plane arrays devices based on relaxor‐based single crystals.

Compensated pyroelectric infrared detector based on Mn‐doped PIMNT single crystal with enhanced signal stability

“…Compared to the voltage‐mode detector, the current‐mode detector has the advantages of small electric time constant, fast response speed, and adjustable internal amplifier circuit. No further amplification is required to meet the application requirements 22,23 . From Figure 1B, the compensation chip with the same chemical composition, size, and opposite polarization direction was connected in parallel with the sensitive element.…”

“…No further amplification is required to meet the application requirements. 22,23 From Figure 1B, the compensation chip with the same chemical composition, size, and opposite polarization direction was connected in parallel with the sensitive element. When the compensated structure was subjected to an environment temperature variation or vibration disturbance, the charge generated in the left sensitive element will be neutralized by the right compensated element.…”

A New Readout Circuit for Pyroelectric Detector Based on Relaxor Ferroelectric Single Crystals

“…However, when the IR signal is removed, the temperature will be decreased, and there is still a similar process. And two opposite directions currents generate in this process [2].…”