METHOD AND APPARATUS FOR MONITORING PARTICLES FLOWING IN A STACK

摘要

A particle monitor for monitoring particles flowing in a stack comprises: (i) a light source (90) for generating a measurement beam (60) on a first side of the particle flow (70); (ii) an optical system for directing the measurement beam (60) towards a second side of the particle flow (70) without the measurement beam (60) scattering from the particles, (iii) a reflector (210) arranged to reflect the measurement beam (60) back towards the first side of the particle flow (70), (iv) an optical system for directing the measurement beam (60) into the particle flow (70) such that light from the measurement beam (60) is scattered by the particles (70); and (v) a scattered-­light detector (80) for detecting, on the first side of the particle flow (70), the scattered light.