Optical Path Length Calibration: A Standard Approach for Use in Absorption Cell-Based IR-Spectrometric Gas Analysis
OPC data as a function of processed to retrieve the optical path lengths of the CUTs A (a) and B (b) of = (21.89 ± 0.08) m and = (0.819 ± 0.0029) m, respectively. For (a) a mixture of about 20 mmol/mol CO2 in nitrogen was used, whereas for (b) a mixture of 10 mmol/mol CH4 in nitrogen was probed for the OPC.
(a) 21 m gas cell
(b) 82 cm gas cell
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