Microwaves for measuring moisture - Science Update - Brief Article

Agricultural Research,  June, 2002  by Stuart O. Nelson

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Monitoring grain moisture is important so that growers can decide when to harvest. If harvesting's done when moisture levels are too high, more grain may be damaged by machinery during threshing and shelling. But if harvesting occurs when the moisture level is too low, more grain may be damaged by kernel breakage and lost because of shattering and shelling. Moisture is also critical in determining how long grain can be safely stored, and it helps determine selling price.

A new technique uses an antenna to transmit microwaves into commodities such as corn, wheat, barley, or soybeans. How the waves are altered as they pass through the grains or beans spells out how much moisture is present.

The new procedure automatically adjusts for different commodities, eliminating the need to change calibrations. It also compensates for variances in grain density and temperature.

The technique could provide continuous moisture monitoring for use on combines and on grain-handling or conveying equipment. Scientists believe the system could be cost effective if developed and commercialized. Stuart O. Nelson, USDA-ARS Quality Assessment Research Unit, Athens, Georgia; phone (706) 546-3101, e-mail sonelson @qaru.ars.usda.gov.

COPYRIGHT 2002 U.S. Government Printing Office
COPYRIGHT 2002 Gale Group