@inproceedings{bfce45d50f434400bd16bb717ef86e84,
title = "Real-time detection of hazardous materials in air",
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 = ΔV·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.",
author = "Israel Schechter and Hartmut Schroeder and Kompa, {Karl L.}",
year = "1994",
language = "英语",
isbn = "0819413658",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "Publ by Society of Photo-Optical Instrumentation Engineers",
pages = "186--195",
editor = "Geoffrey Harding and Lanza, {Richard C.} and Myers, {Lawrence J.} and Young, {Peter A.}",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",
note = "Substance Detection Systems ; Conference date: 03-10-1993 Through 03-10-1993",
}