Discussion
How does a Luft detector achieve its selectivity?
Answer: A
The detector chamber contains the very gas the analyser is built for, so it absorbs at exactly the wavelengths that gas absorbs and is blind to everything else. The absorbed energy heats the filling, the pressure rises and a diaphragm moves, which is sensed capacitively. This gas filled correlation is what makes the classical NDIR so selective without any dispersing element. Interference filters are used in solid state designs, cooling belongs to some semiconductor detectors, and no source emits a single frequency.
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