A Study on Electromagnetic Wave Detection Technology for Grain Storage Amount
Xinxi Zhang · Computer Knowledge and Technology · 2014
To the problem that we lack effective detection technique for grain storage amount,a new detection technique was studied by using very high frequency(VHF) electromagnetic wave and was applied in detecting density distribution in huge grain pile,which may overcome low detecting accuracy,high maintenance costs under-representation and other shortcomings deriving from triditional pressure sensor methods.Using principles of reflection and refraction of electromagnetic wave,we first obtained surface dielectric constant of grain pile,then according to Fresnel's formula and using the surface dielectric constant,inverted dielectric constant distribution of other layers.At last,according to a empirical model called Dielectric-Density Model,we converted dielectric constant distribution to density distribution and then simulated the three-dimensional density distribution of the whole grain pile.The experimental results showed that the method proposed in this paper has the better detecting accuracy and speed and more adapt to a wide range of detection compared to triditional methods.