High Precision Capacitive Moisture Sensor for Polymers

This paper presents a high precision capacitive moisture sensor for polymers that is part of a compact, fast, and economic moisture analyzer capable of reaching similar precision than commercial moisture analyzers based on the Karl Fischer method. The design considerations are described in detail and simulation results are presented showing the relationships between the sensor's geometrical parameters and the sensor's performance. A capacitive moisture sensor prototype was fabricated and experimental results obtained during laboratory tests are reported.