Share Email Print
cover

Proceedings Paper

Measurement of grain moisture with a coplanar electrode capacitance probe
Author(s): Liu Yang; Yu Tan; Lan-lan Dong; Zhi-huai Mao
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

A coplanar electrode capacitance probe which can work on hostile environments has been used to measure the grain moisture. An active shield electrode can block the electric field from out of the sense area and decrease the stray capacitance of the sensor, thus increasing the sensitivity of the sensor. Finite element method has been used to analysis the effect of the active shield electrode. The measuring principle is based on an oscillator working at approximately 2 MHz. The dielectric property of the grain between driven electrode and sensing electrode affects the frequency of the oscillator. According to the measuring experiment, a sensor has been designed whose accurate is 0.5%.

Paper Details

Date Published: 11 July 2009
PDF: 5 pages
Proc. SPIE 7490, PIAGENG 2009: Intelligent Information, Control, and Communication Technology for Agricultural Engineering, 74901D (11 July 2009); doi: 10.1117/12.837325
Show Author Affiliations
Liu Yang, China Agricultural Univ. (China)
Yu Tan, China Agricultural Univ. (China)
Lan-lan Dong, China Agricultural Univ. (China)
Zhi-huai Mao, China Agricultural Univ. (China)


Published in SPIE Proceedings Vol. 7490:
PIAGENG 2009: Intelligent Information, Control, and Communication Technology for Agricultural Engineering

© SPIE. Terms of Use
Back to Top