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Proceedings Paper

Measurement of VOCs in vehicle exhaust by extractive FTIR spectroscopy
Author(s): Bernhard Lechner; H. Paar; Peter J. Sturm
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Paper Abstract

12 The detection of benzene and other organic compounds in vehicle exhaust by FT-IR-spectroscopy is seriously limited by the strong interference of carbon dioxide and the rather weak absorption coefficient of the gases. Therefore, a measurement device was developed which separates the components of interest (mostly VOCs) from carbon dioxide, water and nitric oxide. In addition the VOCs have to be pre- concentrated. To avoid condensation of VOCs the measurements have to take place at higher temperatures. The vehicle exhaust was led through an activated charcoal tube where the organic compounds were adsorbed. Afterwards, the charcoal tube was heated in a furnace, the VOCs were desorbed thermically and were carried by (heated) nitrogen into a gas cell with a path-length of 10 m where the concentration of the different species was measured. With the help of this measurement device a lot of VOC- components like benzene, toluene, and xylene were detected successfully. Measurements were performed on an engine test bed and a chassis dynamometer for heavy duty vehicles. The detection limit of most of the VOCs was about 2 to 3 ppb for a sampling time of 20 min. Calibration measurements showed an accuracy of 15%.

Paper Details

Date Published: 9 February 2001
PDF: 8 pages
Proc. SPIE 4169, Sensors, Systems, and Next-Generation Satellites IV, (9 February 2001); doi: 10.1117/12.417149
Show Author Affiliations
Bernhard Lechner, Technical Univ. of Graz (Austria)
H. Paar, Technical Univ. of Graz (Austria)
Peter J. Sturm, Technical Univ. of Graz (Austria)

Published in SPIE Proceedings Vol. 4169:
Sensors, Systems, and Next-Generation Satellites IV
Hiroyuki Fujisada; Joan B. Lurie; Alexander Ropertz; Konradin Weber, Editor(s)

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