Submitted to: Proceedings of the American Society of Agricultural and Biological Engineers International (ASABE)
Publication Type: Proceedings
Publication Acceptance Date: 6/3/2014
Publication Date: 7/13/2014
Citation: Nelson, S., Trabelsi, S., Lewis, M.A. 2014. Density-independent microwave moisture sensing in flowing grain and seed. Proceedings of the American Society of Agricultural and Biological Engineers International (ASABE). ASABE Paper No. 141895707.
Interpretive Summary: none
Technical Abstract: Current techniques for rapid moisture measurement in grain and seed through sensing the dielectric properties require correction for density fluctuations and therefore are not suitable for reliable measurements on flowing grain. Density-independent moisture sensing in grain and seed is possible at microwave frequencies and has been successfully demonstrated on static samples. Although the theoretical basis for the density-independent grain moisture measurement is expected to be useful on flowing materials, successful use had not been demonstrated. A laboratory flowing grain system was built for tests of microwave moisture measurement that were conducted on shelled field corn, wheat, and soybeans. Appropriate software was written to control a microwave network analyzer for the necessary attenuation and phase measurements, and tests were run on flowing grain and seed materials of high and low moisture levels and at low, medium, and high flow rates. Results confirmed that moisture readings obtained on static and flowing grain and seed agreed well, demonstrating the usefulness of the microwave density-independent technique for monitoring moisture measurements on flowing grain.