The use of FT-IR spectrometers for on-line monitoring and process control has recently been gaining in popularity. Many of these FT-IR systems use LN2 cooled detectors. This paper discusses the use of stirling cycle cryogenic coolers for the cooling of IR detectors to liquid nitrogen temperatures (77 K). The technology of linear drive coolers, using dual opposed pistons and clearance-seal technology is discussed as a method of minimizing detector microphonics while maximizing cooler durability.
Si R. Teigland,
"Detector cooling technology for on-line process control", Proc. SPIE 2069, Optical Methods for Chemical Process Control, (31 December 1993); doi: 10.1117/12.166286; https://doi.org/10.1117/12.166286