Abstract

There is a requirement for the controlled testing of passive infrared remote-sensing vapor detectors. The driving mechanism for the operation of these sensors is the small temperature difference ΔT that occurs between the target vapor and the background. Natural ΔT’s, ranging from a fraction of a degree Kelvin to 20 K or more, have to be duplicated in the laboratory with the vapor contained in a cell. It is shown that the windows of the cell nonlinearly affect the measurements. A proposal is made for a new type of vapor cell, the ectocell, which effectively eliminates the window problems for differential measurements.

© 1995 Optical Society of America

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