The use of light scattering and ion chamber responses for the detection of fires in diesel contaminated atmospheres
The use of light scattering and ion chamber responses for the detection of fires in diesel contaminated atmospheres
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DOI：
10.1016/s0379-7112(01)00059-5
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发表时间：
2002-06-01
影响因子：
3.1
通讯作者：
Litton, CD
中科院分区：
文献类型：
--
作者：
Litton, CD
利用简单的光散射模块，在光源波长为635 nm处，对柴油机颗粒物和各种燃烧气溶胶在有焰燃烧源和阴燃燃烧源分别以15 °和30 °的离散角度进行了光散射特性的实验研究。除了散射数据，同时测量的总气溶胶质量浓度;消光在546 nm的平均波长;和一个共同的双极离子室典型的住宅烟雾探测器修改，使气溶胶流过室的响应。实验结果表明，对于燃烧气溶胶和非燃烧气溶胶，单位质量浓度的强度不仅取决于气溶胶是非燃烧气溶胶还是燃烧气溶胶，而且还取决于燃烧气溶胶的类型。结果还表明，离子室的响应最大的燃烧气溶胶（FCA）和最低的阴燃燃烧气溶胶（SCA）的火焰燃烧气溶胶（FCA）的响应。对于光散射，发现SCA的强度最大，其次是FCA的强度，并且最低的是SCA。本报告介绍了实验，他们的结果，并使用这些结果来开发早期预警火灾传感器的设计标准，能够快速可靠地检测大气中的火灾，可能会或可能不会被柴油发动机产生的产品污染。(C)2002爱思唯尔科技有限公司版权所有。
Experiments were conducted to determine the optical scattering properties of diesel particulate matter (DPM) and various combustion aerosols from both flaming and smoldering combustion sources at discrete angles of 15degrees and 30degrees in the forward direction and at a light source wavelength of 635 nm using a simple light scattering module. In addition to the scattering data, simultaneous measurements were made of the total aerosol mass concentration; light extinction at an average wavelength of 546 nm; and the response of a common bipolar ion chamber typical of residential smoke detectors modified to allow the aerosols to flow through the chamber. The results of these experiments indicate, for DPM and combustion aerosols, the intensities per unit mass concentration depend not only upon whether the aerosol is DPM or combustion aerosol but also upon the type of combustion aerosol. The results also indicate that the ion chamber responses are greatest for DPM, followed by the response to flaming combustion aerosols (FCA) and lowest for smoldering combustion aerosols (SCA). For light scattering, the greatest intensities are found for SCA, followed by the intensities from FCA, and lowest for DPM. This report describes the experiments, their results, and the use of these results to develop design criteria for early warning fire sensors capable of the rapid and reliable detection of fires in atmospheres that may or may not be contaminated by the products produced from diesel engines. (C) 2002 Elsevier Science Ltd. All rights reserved.