A prototypical radiometer using standard one inch interference filters and a lead selenide detector was constructed for use in flame and rocket plume studies. This radiometer was designed to employ a 600 Hz chopper and chopper frequency/phase reference circuit for signal processing. Bandpass filters centered for either 2.7 mum or 4.45 mum were placed in the optical path. The passed carbon dioxide or water vapor band energy irradiated the lead selenide detector, resulting in an output voltage. This signal was then fed into a dedicated synchronous detector. The signal was then recorded by a computer system equipped with an analog-to-digital converter board. Infrared emission data was collected from two inch rocket motors and from a special burner based flame.
Underhill, Kathy; Hudson, M. Keith; Willis, Jason; Mofidi, Mokhtar; and Russo, Matthew J.
"Radiometer for the Investigation of Infrared Emissions from Flames and Rocket Plumes,"
Journal of the Arkansas Academy of Science: Vol. 45
, Article 33.
Available at: https://scholarworks.uark.edu/jaas/vol45/iss1/33