Next Article in Journal
Feasibility of a Gelatin Temperature Sensor Based on Electrical Capacitance
Next Article in Special Issue
Relative Estimation of Water Content for Flat-Type Inductive-Based Oil Palm Fruit Maturity Sensor
Previous Article in Journal
Monitoring Building Deformation with InSAR: Experiments and Validation
Previous Article in Special Issue
A Node Localization Algorithm Based on Multi-Granularity Regional Division and the Lagrange Multiplier Method in Wireless Sensor Networks
Article Menu

Export Article

Open AccessArticle
Sensors 2016, 16(12), 2196; doi:10.3390/s16122196

Nondestructive In Situ Measurement Method for Kernel Moisture Content in Corn Ear

1
College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
2
Key Laboratory of Agricultural Information Acquisition Technology (Beijing), Ministry of Agriculture, Beijing 100083, China
3
Modern Precision Agriculture System Integration Research Key Laboratory, Ministry of Education, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Simon X. Yang
Received: 10 September 2016 / Revised: 25 November 2016 / Accepted: 7 December 2016 / Published: 20 December 2016
(This article belongs to the Special Issue Sensors for Agriculture)
View Full-Text   |   Download PDF [5370 KB, uploaded 20 December 2016]   |  

Abstract

Moisture content is an important factor in corn breeding and cultivation. A corn breed with low moisture at harvest is beneficial for mechanical operations, reduces drying and storage costs after harvesting and, thus, reduces energy consumption. Nondestructive measurement of kernel moisture in an intact corn ear allows us to select corn varieties with seeds that have high dehydration speeds in the mature period. We designed a sensor using a ring electrode pair for nondestructive measurement of the kernel moisture in a corn ear based on a high-frequency detection circuit. Through experiments using the effective scope of the electrodes’ electric field, we confirmed that the moisture in the corn cob has little effect on corn kernel moisture measurement. Before the sensor was applied in practice, we investigated temperature and conductivity effects on the output impedance. Results showed that the temperature was linearly related to the output impedance (both real and imaginary parts) of the measurement electrodes and the detection circuit’s output voltage. However, the conductivity has a non-monotonic dependence on the output impedance (both real and imaginary parts) of the measurement electrodes and the output voltage of the high-frequency detection circuit. Therefore, we reduced the effect of conductivity on the measurement results through measurement frequency selection. Corn moisture measurement results showed a quadric regression between corn ear moisture and the imaginary part of the output impedance, and there is also a quadric regression between corn kernel moisture and the high-frequency detection circuit output voltage at 100 MHz. In this study, two corn breeds were measured using our sensor and gave R2 values for the quadric regression equation of 0.7853 and 0.8496. View Full-Text
Keywords: corn ear; moisture; nondestructive measurement; high-frequency detection; impedance corn ear; moisture; nondestructive measurement; high-frequency detection; impedance
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Zhang, H.-L.; Ma, Q.; Fan, L.-F.; Zhao, P.-F.; Wang, J.-X.; Zhang, X.-D.; Zhu, D.-H.; Huang, L.; Zhao, D.-J.; Wang, Z.-Y. Nondestructive In Situ Measurement Method for Kernel Moisture Content in Corn Ear. Sensors 2016, 16, 2196.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top