Dual channel pyroelectric infrared detectors (Channel1 = sample gas, and Channel2 = optical reference) are used in sensor modules of many manufactures that build NDIR Gas analyzers. The 4-pin TO39 package in which the Pyroelectric chips are integrated, along with JFETs and high Ohm resistors is a standard.
the “SENSOR Innovation Prize 2008” of the AMA Fachverband für Sensorik e.V. (AMA Special Association for Sensor Technology, non-profit) in Nuremberg on occasion of the SENSOR+TEST fair.