23 May 1997 Quality-assurance procedures and measurements for open-path FTIR spectroscopy
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Abstract
Infrared Fourier transform open-path spectroscopy becomes a more and more well-known method to monitor air pollution. Several companies are even selling instruments especially devoted to this application. Numerous campaigns have delivered interesting information and proved the usefulness of the technique. However the results still suffer from a certain mistrust. Reliability, reproducibility, stability are for instance not yet well defined. In order to fill this lack, we have performed a set of test measurements which could be carried out on any FTIR long-path system. This quality assurance protocol includes the determination of noise, return signal stability, detection limits, precision and accuracy. The procedure to estimate each of these parameters is described. The feasibility and relevance of these measurements have been tested on both monostatic and bistatic set-ups. Both instruments have been studied over a period of several months. Many of the parameters can be calculated without doing extra measurements and were evaluated whenever the instruments were in use. To determine parameters such accuracy and precision, series of spectra were especially acquired. This shows the possibility to better quantify the performance of open-path FTIR spectrometers. Further improvements are also suggested.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mathilde Douard, Juergen Zeutzius-Reitz, Torsten Lamp, Alexander Ropertz, Konradin Weber, "Quality-assurance procedures and measurements for open-path FTIR spectroscopy", Proc. SPIE 3107, Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods, (23 May 1997); doi: 10.1117/12.274747; https://doi.org/10.1117/12.274747
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