Ambient temperature reference device
First Claim
1. 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.
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Accused Products
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.
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Citations
10 Claims
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1. A device which is an ambient temperature reference for a long-path Fourier transform infrared spectrophotometer used to analyze a gas comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification