The use of light scattering and ion chamber responses for the detection of fires in diesel contaminated atmospheres

摘要

Experiments were conducted to determine the optical scattering properties of diesel particulate mater (DPM) and various combustion aerosols from both flaming and smoldering combustion sources at discrete angles of 15 °and 30° 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 concentra- tion; 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.