An isokinetic sampler for use on light aircraft

Abstract A light aircraft-mounted isokinetic sampler was designed for obtaining accurate samples of heterodisperse particulate matter in the lower atmosphere. The sampler head is operated in undisturbed air under the wing and is drawn into the cabin along a track for changing filters. A battery-powered, high volume sampler in the cabin serves as the air moving device. The sampler can draw as much as 0.72 m3min−1 and match aircraft speeds to 38 m s− at standard temperature and pressure. The sampler is being used for measuring the vertical distribution of airborne pollens and industrial air pollutants and for determining the size distribution and composition of power plant stack effluents.