Measurement of grain moisture content using microwave attenuation at 10.5 GHz and moisture density

Author

Kim, Ki-Bok ; Kim, Jong-Heon ; Lee, Seung Seok ; Noh, Sang Ha

Author_Institution

Center for Safety Meas., Korea Res. Inst. of Stand. & Sci., Daejon, South Korea

Volume

51

Issue

1

fYear

2002

fDate

2/1/2002 12:00:00 AM

Firstpage

72

Lastpage

77

Abstract

The dielectric properties of Korean short-grain rough rice, brown rice and barley with moisture content ranges of 11% to 27%, 11% to 18%, and 11 to 21%, wet basis, respectively, were characterized to develop a prototype grain moisture meter using microwave attenuation at 10.5 GHz and moisture density. A third-order polynomial regression model was proposed to describe the relationship between dielectric properties and moisture density. The prototype grain moisture meter consisted of a dielectric resonator type oscillator of 10.5 GHz, horn antenna, rectangular sample holder, load cell, temperature sensor, detector, and digital voltmeter. The calibration equation for measurement of grain moisture content was developed and estimated with Korean short-grain rough rice (12% to 26%). The coefficient of determination, standard error of prediction (SEP), and bias were 0.986, 0.52% moisture content and 0.07% moisture content, respectively

Keywords

calibration; density; dielectric resonator oscillators; digital voltmeters; electromagnetic wave absorption; horn antennas; microwave detectors; microwave measurement; moisture measurement; polynomials; statistical analysis; temperature sensors; 10.5 GHz; Korean short-grain rough rice; barley; bias; brown rice; calibration equation; coefficient of determination; detector; dielectric properties; dielectric resonator type oscillator; digital voltmeter; grain moisture content; grain moisture content measurement; horn antenna; load cell; microwave attenuation; moisture content ranges; moisture density; prototype grain moisture meter; rectangular sample holder; standard error of prediction; temperature sensor; third-order polynomial regression model; Attenuation measurement; Dielectric measurements; Dielectric resonator antennas; Horn antennas; Loaded antennas; Microwave measurements; Microwave oscillators; Moisture measurement; Polynomials; Prototypes;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.989904

Filename

989904