부산대학교 도서관

Carbon monoxide (CO) is an important molecule for environmental monitoring, industrial process control, and a biomarker in exhaled human breath. Obtaining reliable and traceable data is indispensable. We employed direct absorption spectroscopy-based absolute amount fraction measurements of CO in a gravimetrically prepared gas mixture. A quantum-cascade laser operated in the intrapulse mode was used to probe the P(1) line of CO at 2139.4 cm. The spectrometrically determined CO amount fraction agrees perfectly with the gravimetric reference value. We focused on the method, the uncertainty analysis of the spectrometry-based data retrieval and the respective traceability of input parameters to the SI. An uncertainty budget is presented. Our reproducibility is better than 1%. The relative deviation of the spectrometric CO amount fractions from the gravimetric reference value reads minus 1.8%, which is covered by a 4% relative expanded uncertainty of single measurements ( k=2). [ABSTRACT FROM AUTHOR]