IMPROVED DETECTOR

摘要

A detector 1 having a sensor 15, an aspiration system 10, and a power source, whereby the aspiration system 10 includes two or more aspirators 16a, 16b. A method of operating the detector 1 is also disclosed, as is a trap 70 for absorbing output from a laser 66 used to detect particulate matter passing through the detector 1, wherein the trap 70 includes an absorption plate orientated substantially at a Brewster angle to the light 72 from the laser 66.