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Introduction In recent years there has been an increasing interest in detection and precise measurement of environmentally important atmospheric trace gases such as nitric oxide NO , carbon monoxide CO , nitrous oxide N2O , formaldehyde H2CO , methane CH4 , and sulfur dioxide SO2 . At any point in the scan, the Beer–Lambert law for the power transmitted in the presence of CO, P , as compared with the power transmitted in the absence of CO, P0 , is P P0 exp CL , where is the absorptivity, C is the concentration of CO, and L is the path length of the cell.
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