Abstract

A variable-temperature absorption cell 3 m in length, which was designed and built for spectroscopic measurements of gases in combination with a Bruker IFS 120 HR interferometer, is described. The cell is surrounded by a cooling system and a heating system. The heating system consists of a computer-controlled set of 16 independent heating elements distributed over the length of the cell. The entire assembly enables measurements to be made in the temperature range from 123 to 423 K. The temperature of the cell can be stabilized within ±0.5 K over the entire length in this temperature range. The performance of the cell is discussed in relation to a spectroscopic temperature determination by the use of CO₂ intensity measurements.

© 1996 Optical Society of America

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