13 May 2015 A method for continuous in-situ pathlength calibration of integrating sphere based gas cells
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Abstract
We introduce a novel approach to continuous in-situ pathlength calibration of an integrating sphere based gas cell. Using two light sources and two detectors, a four beam ratiometric scheme is constructed, which compensates for component variation and sample chamber contamination. By applying the scheme to both on and off gas line measurements, changes in pathlength due to cell wall contamination can be identified and corrected. In this way the gas absorption coefficient can be determined continuously without needing to recalibrate the sphere. Results are presented for detection of methane at 1651nm. This method has the potential for extension to other gases such as CO2, CO, H2S, NOx.
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S. Bergin, J. Hodgkinson, D. Francis, R. P. Tatam, "A method for continuous in-situ pathlength calibration of integrating sphere based gas cells", Proc. SPIE 9486, Advanced Environmental, Chemical, and Biological Sensing Technologies XII, 94860G (13 May 2015); doi: 10.1117/12.2176225; https://doi.org/10.1117/12.2176225
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