Multipoint Detection of Products of Combustion with Tube Bundles. Transit Times,Transmissions of Submicrometer Particulates,and General Applicability.

摘要

A new detection methodology was evaluated--the pneumatic,sequential sampling of many points in a system through branching tube bundles that lead to a single analytic station of high sensitivity,reliability,and convenient location. The alternative method requires a large number of individual sensors. The tube bundle method is generally applicable to many industrial or commercial detection problems,but this Bureau of Mines study concerns its use as a sensitive and reliable detector of mine fires. Two serious limitations inhibit its use:the relatively slow response times for long lengths of arrow sampling tubes and the wall-diffusion losses for submicron smoke particulates. These limitations were quantitatively evaluated by measuring tube transit times and smoke particulate transmissions as a function of tube length,diameter and pressure drop.