Mid-infrared radiation technique for direct pyroelectric and electrocaloric measurements.

A mid-infrared radiometric (MIR) method for precise in situ temperature measurements when studying pyroelectric and electrocaloric properties of bulk and film materials is presented. The method uses new MIR-temperature sensors based on narrowband high-speed and high-sensitive uncooled immersion lens AB photodiodes with a precalibration procedure. They are completely insensitive to the background illumination with λ ≤ 1 µm and provide contactless temperature measurements directly in the area of laser heating action.