Microwave Mixing Technique for Nondestructive Measurement of Moisture Content of Particulate Agricultural Products

  • Chenxiao Li
  • Yanlei Xu
  • He Gong
  • Yuanyuan Liu
  • Qian SongEmail author
Conference paper
Part of the IFIP Advances in Information and Communication Technology book series (IFIPAICT, volume 546)


A new method for nondestructive measurement of moisture content of particulate agricultural products is developed using microwave mixing technique. A double horn system with a relative vertical distance of one-fourth wavelengths is designed to measure the reflected microwave signals. The particulate materials are interacted with microwave at a frequency of 10.5 GHz, and the reflected microwave signal is mixed with the launch signal. Corns with different moisture contents are chosen as samples. Calibration models for moisture content are proposed in accordance with the measurement of the differential attenuation of the microwave mixing signal. A moisture content from 6.8% to 30.1% is obtained with a coefficient of determination of 0.98 and a standard error of calibration value of 1.12%.


Moisture content Microwaves Mixing technique Nondestructive measuring 



This work was supported by Jilin Scientific and Technological Development Program (No. 20180520016JH) and the Scientific Research Foundation of Jilin Agricultural University (No. 201719).


  1. 1.
    Martines-López, E., Lira-Cortés, L.: Measurement of moisture content of some hydrated ionic materials by oven drying. MAPAN 30(4), 239–247 (2015)CrossRefGoogle Scholar
  2. 2.
    Walker, J.P., Willgoose, G.R., Kalma, J.D.: In situ measurement of soil moisture: a comparison of techniques. J. Hydrol. 293(1–4), 85–99 (2004). NOVA. The University of Newcastle’s Digital RepositoryCrossRefGoogle Scholar
  3. 3.
    Wu, K.: Measurement of soil moisture change in spatially heterogeneous weathered soils using a capacitance probe. Hydrol. Process. 12(1), 135–146 (2015)CrossRefGoogle Scholar
  4. 4.
    Kim, K.B., Kim, J.H., Lee, S.S., et al.: Measurement of grain moisture content using microwave attenuation at 10.5 GHz and moisture density. IEEE Trans. Instrum. Meas. 51(1), 72–77 (2000)Google Scholar
  5. 5.
    Nelson, S.O., Trabelsi, S.: Factors influencing the dielectric properties of agricultural and food products. J. Microw. Power Electromagn. Energy: A Publ. Int. Microw. Power Inst. 46(2), 93–107 (2012)CrossRefGoogle Scholar
  6. 6.
    Trabelsi, S., Nelson, S.O.: Nondestructive sensing of physical properties of granular materials by microwave permittivity measurement. IEEE Trans. Instrum. Meas. 55(3), 953–963 (2006)CrossRefGoogle Scholar
  7. 7.
    Trabelsi, S., Lewis, M.A., Nelson, S.O.: Microwave moisture meter for in-shell peanut kernels. Food Control 66, 283–290 (2016)CrossRefGoogle Scholar
  8. 8.
    Krupka, J.: REVIEW ARTICLE: frequency domain complex permittivity measurements at microwave frequencies. Meas. Sci. Technol. 17(6), 55–70 (2006)CrossRefGoogle Scholar
  9. 9.
    Hashemi, A., Rashidi, M., Kurtis, K.E., et al.: Microwave dielectric properties measurements of sodium and potassium water glasses. Mater. Lett. 169, 10–12 (2016)CrossRefGoogle Scholar
  10. 10.
    Nigmatullin, R., Nelson, S.O.: New quantitative “reading” of dielectric spectra of complex biological systems. IEEE Trans. Dielectr. Electr. Insul. 13(6), 1325–1334 (2006)CrossRefGoogle Scholar
  11. 11.
    Trabelsi, S., Paz, A.M., Nelson, S.O.: Microwave dielectric method for the rapid, non-destructive determination of bulk density and moisture content of peanut hull pellets. Biosys. Eng. 115(3), 332–338 (2013)CrossRefGoogle Scholar
  12. 12.
    Li, C., Han, B., Zhang, T.: Free-space reflection method for measuring moisture content and bulk density of particulate materials at microwave frequency. Rev. Sci. Instrum. 86(3), 227–237 (2015)Google Scholar

Copyright information

© IFIP International Federation for Information Processing 2019

Authors and Affiliations

  • Chenxiao Li
    • 1
  • Yanlei Xu
    • 1
  • He Gong
    • 1
  • Yuanyuan Liu
    • 1
  • Qian Song
    • 2
    Email author
  1. 1.College of InformationJilin Agriculture UniversityChangchunChina
  2. 2.College of PhysicsJilin UniversityChangchunChina

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