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Proceedings Paper

Laser-based detection of trace gases released by crops under long-term storage
Author(s): Jos Oomens; S. Persijn; R. H. Veltman; A. C. R. van Schaik; Hugo S. M. de Vries; Frans J. M. Harren; David H. Parker
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Paper Abstract

A CO laser emitting radiation between 1300 and 2000 cm-1 is applied to monitor trace gas emissions using photoacoustic detection. Several biologically interesting gases can be detected by tuning the laser frequency to absorption bands of these species. The sensitivity of the system reaches the ppbv level (acetaldehyde: 0.1 ppbv, ethanol: 3 ppbv, C2H6: 1 ppbv) allowing us to study e.g. an individual piece of fruit. The selectivity is enhanced by a cold trap kept at a temperature between 0 and minus 180 degrees Celsius so that unwanted species can be frozen out. The biological sample is placed in a continuous flow system of a few liters per hour which leads the released gases from the sample to the photoacoustic cell, thus creating an on-line and non-intrusive technique.

Paper Details

Date Published: 30 May 1997
PDF: 9 pages
Proc. SPIE 3105, Chemical, Biochemical and Environmental Fiber Sensors IX, (30 May 1997); doi: 10.1117/12.276176
Show Author Affiliations
Jos Oomens, Univ. of Nijmegen (Netherlands)
S. Persijn, Univ. of Nijmegen (Netherlands)
R. H. Veltman, ATO-DLO--Agrotechnological Research Institute (Netherlands)
A. C. R. van Schaik, ATO-DLO--Agrotechnological Research Institute (Netherlands)
Hugo S. M. de Vries, ATO-DLO--Agrotechnological Research Institute (Netherlands)
Frans J. M. Harren, Univ. of Nijmegen (Netherlands)
David H. Parker, Univ. of Nijmegen (Netherlands)

Published in SPIE Proceedings Vol. 3105:
Chemical, Biochemical and Environmental Fiber Sensors IX
Robert A. Lieberman, Editor(s)

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