Patent ID: 8198589
Filing Date: 2012-06-12
Classification: G01N

Abstract:
1. A gas filter correlation radiometer, comprising: a window in a housing; optics defining a first optical path and a second optical path between the window and a detector section mounted in the housing; a bi-prism beam splitter comprising a pair of side-by-side prisms mounted transversely in the housing in relation to the first optical path and the second optical path as part of the optics for directing radiation entering the window from an outside source along two divergent paths offset from each other by refraction through the bi-prism beam splitter to divide the radiation between the first optical path and the second optical path; the first optical path having a first gas path length and the second optical path having a second gas path length, the first gas path length being different from the second gas path length; and electronics for processing signals produced by the detector section as a result of radiation being directed by the optics onto the detector section.