Humidity determination of hydrated media by a microwave technique

This study proposes a humidity meter using a frequency of 9.4 GHz. The average medium water content, obtained by a non-destructive technique, gives instantly the humidity of a particular granulated volume of agricultural seeds. The laboratory and field studies, effected with various agricultural seeds, gave good results over a large range of humidity tested (7%<H_p<60%). The measurements qualities depend essentially on how the calibration curves are obtained. The microwave measurements precision, compared with those done by classical drying methods, were close to 0.5% for high humidity rates. The humidity determination by a microwaves technique seems to be well adapted for a wide range of applications