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6 July 2000 Multifrequency sensing of large-sized dielectric boards
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After introducing some possibilities and related problems of microwave moisture measurements, a non-destructive testing method of large-sized dielectric boards is shown, which is based on a microwave free-space/double transmission/reflection type two-parameter complex vector measurement. Unlike this basic idea, a 5.8 GHz monitoring system was developed, which is used for moisture content measurement and quality forecast of particleboards continuously, before mechanical testing would be accomplished. Recalling some basic equations, the calculation of Kasa's circles, dry wood basic weight, complex permittivity values, absolute moisture content and mechanical properties of composite boards, also are shown. Low cost MMICs, self-designed microstrip antennas and passive detector/backscatters are used in the instrumentation for the realization of the concept.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ferenc Volgyi "Multifrequency sensing of large-sized dielectric boards", Proc. SPIE 4129, Subsurface Sensing Technologies and Applications II, (6 July 2000);

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