Infrared (IR) gas sensors are a minority of the general gas-sensing instrument market. They compete with devices based upon gas interaction with surfaces such as electrochemical sensors. They di¬er in that IR devices are selective, can`fail to safety' and are potentially intrinsically safe. However, they tend to be more expensive, using existing technology. We may expect that in due course the impact of all solid-state semiconductor mid-IR technology should revolutionize this situation and lead to signi cant growth in IR gas sensing.
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