A Fog Chamber and Wind Tunnel Facility for Calibration of Cloud Water Collectors

The interest in cloud water chemistry and the role of intercepted cloud water in forest die-back has led to the construction and use of various droplet collectors. Most of these collectors have not been calibrated adequately. In this paper a facility for testing of cloud and fog water collectors is described. Water droplets of known composition and size are used in the calibration process. To overcome errors due to evaporation of the droplets after generation, the air is pre-humidified and thermostated. By using different types of generators, various polydisperse droplet spectra can be obtained.