Ambient temperature reference device
AssigneeMiles Inc.
InventorsRobert L. Sandridge, Robert N. Hunt
Life of this patent
Estimating the term…
Abstract
A device for establishing an ambient temperature correction having (a) at least one reference surface which adequately represents the black body radiation spectrum of the air column between a long-path FTIR spectrometer and the infra-red source and (b) at least one means for shielding the reference surface from external sources of radiation gain or loss. In a preferred embodiment, the reference surface is made of thin metal having a blackened surface surrounded by an insulating shield. It is also preferred that a means for promoting positive air circulation across the reference surface or surfaces be included in the device of the present invention. This device is positioned in a location such that the field of view of the long-path FTIR spectrometer will be covered.
Claims10
A device which is an ambient temperature reference for a long-path Fourier transform infrared spectrophotometer used to analyze a gas comprising:
- (a) a heat conductive surface which approximates the black body radiation spectrum of an air column between the spectrophotometer and an infrared source, and
- (b) means for shielding the heat conductive surface from sources of radiation gain or loss.
Dependencies are inferred from the claim text.