Browse Prior Art Database

Water Droplet Detector

IP.com Disclosure Number: IPCOM000059609D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Durrant, G: AUTHOR

Abstract

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.

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Water Droplet Detector

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. A megohmmeter measures the resistance between the panels 1 and 2 when a 30-volt bias is applied. The presence of water droplets causes the measured resistance to drop by a factor of about 100.

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