A suite of sensors based on electrochemical impedance spectroscopy (EIS) are being developed that enable moisture absorption and corrosion to be detected and monitored for painted metal structures, composites, and adhesive joints. Both handheld and permanent mounted sensors are available for specific needs. Because the sensors monitor the actual structure of interest instead of a component of the sensor, they have direct applicability to 1) coating evaluation and screening, 2) health monitoring of critical coated and bonded structures, 3) spot checks of critical structures, 4) moisture detection in composites prior to repair operations, and 5) laboratory investigations of degradation mechanisms.

In-Situ Sensor to Detect Moisture Intrusion and Degradation of Coatings, Composites, and Adhesive Bonds, G.D. Davis, C.M. Dacres, and L.A. Krebs, DACCO SCI Inc.