Grain flow measurements with X-ray techniques

Grain flow measurements with X-ray techniques The use of low energy X-rays, up to 30 keV, densitometry is demonstrated for grain flow rate measurements through laboratory experiments. Mass flow rates for corn were related to measured X-ray intensity in gray scale units with a 0.99 correlation coefficient for flow rates ranging from 2 to 6 kg/s. Larger flow rate values can be measured by using higher energy or a higher tube current. Measurements were done in real time at a 30 Hz sampling rate. Flow rate measurements are relatively independent of grain moisture due to a negligible change in the X-ray attenuation coefficients at typical moisture content values from 15 to 25%. Grain flow profile changes did not affect measurement accuracy. X-rays easily capture variations in the corn thickness profile. Due to the low energy of the X-ray photons, biological shielding can be accomplished with 2-mm-thick lead foil or 5 mm of steel. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Computers and Electronics in Agriculture Elsevier

Grain flow measurements with X-ray techniques

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Publisher
Elsevier
Copyright
Copyright © 2000 Elsevier Science B.V.
ISSN
0168-1699
eISSN
1872-7107
D.O.I.
10.1016/S0168-1699(00)00074-0
Publisher site
See Article on Publisher Site

Abstract

The use of low energy X-rays, up to 30 keV, densitometry is demonstrated for grain flow rate measurements through laboratory experiments. Mass flow rates for corn were related to measured X-ray intensity in gray scale units with a 0.99 correlation coefficient for flow rates ranging from 2 to 6 kg/s. Larger flow rate values can be measured by using higher energy or a higher tube current. Measurements were done in real time at a 30 Hz sampling rate. Flow rate measurements are relatively independent of grain moisture due to a negligible change in the X-ray attenuation coefficients at typical moisture content values from 15 to 25%. Grain flow profile changes did not affect measurement accuracy. X-rays easily capture variations in the corn thickness profile. Due to the low energy of the X-ray photons, biological shielding can be accomplished with 2-mm-thick lead foil or 5 mm of steel.

Journal

Computers and Electronics in AgricultureElsevier

Published: Mar 1, 2000

References

  • Comparisons of sensors and techniques for crop yield mapping
    Birrell, S.J.; Sudduth, K.A.; Borgelt, S.C.

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