Ambient temperature reference device

Details Ambient temperature reference device Ambient temperature reference device

1993-10-06

1995-03-21

Fields, Carolyn E.

Radiant energy

Calibration or standardization methods

25033908, 25033909, 25033913, 2504931, 356346, G01N 2135

Patent

active

053998561

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.

REFERENCES:
patent: 4795253 (1989-01-01), Sandridge et al.
patent: 4999498 (1991-03-01), Hunt et al.
Herget et al., "Remote Fourier Transform Infrared Air Pollution Studies", Optical Eng., 19 (4), Jul./Aug. 1980, pp. 508-514.

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