
378 Microwave Engineering
shift can be employed to monitor the moisture in paper and textile industry.
Figure 10.43b illustrates the location of a paper sheet in between a horn and
a metallic reector.
The measurement techniques may be modied in accordance to the struc-
ture and shape of the test object. Setups for sheet materials (i.e. paper, tex-
tile, laminated wood) will differ from those for testing granulated or porous
materials (sand, clay, bricks, etc.) or liquids.
10.9.7 Measurement/Monitoring Moisture Content in Liquids
Moisture content changes the effective permittivity of a liquid. Thus, the tech-
nique used to measure the resonance f ...