Laser-based detection of trace gases released by crops under long-term storage

Jos Oomens; S. Persijn; R. H. Veltman; A. C. R. van Schaik; Hugo S. M. de Vries; Frans J. M. Harren; David H. Parker

doi:10.1117/12.276176

30 May 1997 Laser-based detection of trace gases released by crops under long-term storage

Jos Oomens, S. Persijn, R. H. Veltman, A. C. R. van Schaik, Hugo S. M. de Vries, Frans J. M. Harren, David H. Parker

Proceedings Volume 3105, Chemical, Biochemical and Environmental Fiber Sensors IX; (1997) https://doi.org/10.1117/12.276176
Event: Environmental Sensing III, 1997, Munich, Germany

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.

Citation Download Citation

Jos Oomens, S. Persijn, R. H. Veltman, A. C. R. van Schaik, Hugo S. M. de Vries, Frans J. M. Harren, and David H. Parker "Laser-based detection of trace gases released by crops under long-term storage", Proc. SPIE 3105, Chemical, Biochemical and Environmental Fiber Sensors IX, (30 May 1997); https://doi.org/10.1117/12.276176

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