Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Development of Moisture Content Measurement Device for Paddy Rice using Microwave Free Space Transmission

마이크로파 자유공간 전송을 이용한 산물벼 함수율 측정장치 개발

  • 김기복 (서울대학교 농업생명과학대학 생물자원공학부 농업기계전공 정회원) ;
  • 김종헌 (광운대학교 공과대학 전파공학과) ;
  • 노상하 (서울대학교 농업생명과학대학 생물자원공학부 농업기계전공 정회원)
  • Published : 1999.06.01
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Abstract

This study was conducted to develop a grain moisture meter using microwave free space transmission technique at X-band frequency. The 10.5GHz microwave oscillator using a dielectric resonator was designed and fabricated to transmit electromagnetic wave through standard horn antenna to a sample holder with the wetted Hwasung and Chuchung rough rice(12.00∼26.25%). To detect the output voltage of transmitted wave from receiving horn antenna, the detector was composed of shottkey diode and RF impedance matching circuit. The regression model for measurement of grain moisture content was developed. Its correlation coefficient and standard error of prediction (SEP) were found to be 0.9882 and 0.657 respectively between measure and predicted moisture contents.

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