Title :
Application of multivariate analysis to gas-phase spectroscopy at 245 GHz
Author :
Neumaier, Philipp F-X ; Schmalz, K. ; Borngraber, Johannes ; Hubers, Heinz-Wilhelm
Author_Institution :
German Aerosp. Center (DLR), Inst. of Planetary Res., Berlin, Germany
Abstract :
This paper describes the application of multivariate analysis (MVA) techniques to terahertz (THz) gas-phase absorption spectra at around 245 GHz. The THz spectra of gaseous volatile organic compounds (VOCs) and their complex mixtures at pressures between 10 and 5000 Pa were acquired with a vector network analyzer (VNA) and an absorption cell. With the subsequent MVA our experiment shows the feasibility of qualitative and quantitative substance identification. Since the tested VOCs are biomarkers and/or can be found on the EPA (US Environmental Protection Agency) list of harmful substances there is a potential for application in medicine and security. In particular because our measurements show that there is no need of measuring in the Doppler limit.
Keywords :
gas mixtures; gas sensors; network analysers; organic compounds; spectrometers; terahertz spectroscopy; terahertz wave spectra; Doppler limit; absorption cell; gas phase spectroscopy; gaseous volatile organic compounds; multivariate analysis; qualitative substance identification; quantitative substance identification; terahertz gas phase absorption spectra; vector network analyzer; Absorption; Biomarkers; Doppler effect; Extraterrestrial measurements; Gas detectors; Principal component analysis; Spectroscopy;
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on
Conference_Location :
Tucson, AZ
DOI :
10.1109/IRMMW-THz.2014.6956468
