An Aerosol Chamber for Instrument Evaluation and Calibration

Abstract

An aerosol test chamber has been developed for the purpose of providing an environment for the evaluation of several aerosol measuring instruments and samplers at one time. Evaluations of the chamber have shown that the aerosol concentration is uniform throughout the area of the test section, which is 1.1 m2 in size, with good temporal stability. To ensure further that all instruments obtain the same aerosol exposure, the floor of the chamber's test section has been designed as a turntable. The turntable can be rotated for the duration of a test, continuously moving the instruments in the test section. The design of the chamber, the controls, and operating procedures are described, as well as the results of spatial uniformity and temporal stability evaluations using monodisperse liquid aerosols from 2.5-µm to 15-µm diameter and polydisperse dust particles.