Abstract
A microwave strip line sensor has been inserted in the barrel of a pilot scale extrusion cooker immediately before the die. Experiments with maize grits have shown that the microwave attenuation is sensitive to the moisture content of the feed. Preliminary experiments with finer particulate feedstock indicate that the microwave attenuation also depends on the distribution of water within the viscous material at this point. A microwave sensor is shown to have potential for probing the material within an extrusion cooker for use in controlling product properties.
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