Microwave Sensors for in Situ Evaluation of Moisture in Polymers
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
We demonstrate the feasibility of a moisture meter which senses the complex permittivity of materials non-destructively. The test materials can be non-conductive solids, particulates or liquids. The meter consists of a sensor plus ancillary electronics. The sensors operate in the microwave region to mitigate certain problems of penetration depth, electrode polarization and ionic conductivity which are encountered in other frequency bands.