Abstract

The usefulness of a room-temperature HgCdTe detector in a simple air pollution detection system with a CO₂ laser has been investigated. The results show that the detector responsivity is flat in the frequency range 200–400 Hz and the minimum detectable concentration of ethylene is ∼2 parts in 10⁶-meter (ppm-m). The estimated sensitivity is comparable with the values obtained by using liquid-nitrogen-cooled HgCdTe detectors.

© 1993 Optical Society of America

Optoacoustic detection of ethylene in the presence of interfering gases

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