Water Droplet Detector
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
The presence of water droplets in certain manufacturing or testing environments is undesirable. A detector of airborne water droplets, which operates independently of whether or not condensation is occurring, comprises two large conductive mesh panels spaced apart by a thin layer of electrical insulating material. The electrical resistance between the panels is measured. Normally very high, this resistance is found to drop markedly if droplets hit the detector. In the illustrated detector, panels 1 and 2 are stainless steel meshes. Aperture sizes are typically 2.5 and 3.5 microns, respectively. The insulating spacer is a layer 3 of PTFE, 0.4 mm thick. The overall dimension of the mesh panels is about 25 cm. In operation, the detector is placed with the larger mesh 3 facing in the direction of any airflow.