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Proceedings Paper

Real-time detection of hazardous materials in air
Author(s): Israel Schechter; Hartmut Schroeder; Karl Ludwig Kompa
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Paper Abstract

A new detection system has been developed for real-time analysis of organic compounds in ambient air. It is based on multiphoton ionization by an unfocused laser beam in a single parallel-plate device. Thus, the ionization volume can be relatively large. The amount of laser created ions is determined quantitatively from the induced total voltage drop between the biased plates (Q equals (Delta) V(DOT)C). Mass information is obtained from computer analysis of the time-dependent signal. When a KrF laser (5 ev) is used, most of the organic compounds can be ionized in a two-photon process, but none of the standard components of atmospheric air are ionized by this process. Therefore, this instrument may be developed as a `sniffer' for organic materials. The method has been applied for benzene analysis in air. The detection limit is about 10 ppb. With a simple preconcentration technique the detection limit can be decreased to the sub-ppb range. Simple binary mixtures are also resolved.

Paper Details

Date Published: 28 March 1994
PDF: 10 pages
Proc. SPIE 2092, Substance Detection Systems, (28 March 1994); doi: 10.1117/12.171239
Show Author Affiliations
Israel Schechter, Max Planck Institute for Quantum Optics (Germany)
Hartmut Schroeder, Max Planck Institute for Quantum Optics (Germany)
Karl Ludwig Kompa, Max Planck Institute for Quantum Optics (Germany)


Published in SPIE Proceedings Vol. 2092:
Substance Detection Systems
Geoffrey L. Harding; Richard C. Lanza; Lawrence J. Myers; Peter A. Young, Editor(s)

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