Development of a 500mhz Reflectometer Using Stripline Coupler for Moisture Measurement of Oil Palm Fruits

This thesis describes the development of a cost effective PC-based reflectometer for the determination of moisture content in oil palm fruits to gauge its degree of ripeness. The PC-controlled reflectometer which operates at 500 MHz consists of a stripline directional coupler, two diode detectors, a...

全面介绍

Saved in:
书目详细资料
主要作者: Lee, Kim Yee
格式: Thesis
语言:English
English
出版: 2004
主题:
在线阅读:http://psasir.upm.edu.my/id/eprint/401/1/549705_FSAS_2004_39.pdf
标签: 添加标签
没有标签, 成为第一个标记此记录!
id my-upm-ir.401
record_format uketd_dc
spelling my-upm-ir.4012013-05-27T06:48:06Z Development of a 500mhz Reflectometer Using Stripline Coupler for Moisture Measurement of Oil Palm Fruits 2004-07 Lee, Kim Yee This thesis describes the development of a cost effective PC-based reflectometer for the determination of moisture content in oil palm fruits to gauge its degree of ripeness. The PC-controlled reflectometer which operates at 500 MHz consists of a stripline directional coupler, two diode detectors, a data acquisition card and two open-ended coaxial sensors. The design, analysis and performance of the stripline directional coupler in conjunction with the open-ended coaxial sensors for moisture content determination of oil palm fruits are described in detail. Simulations have been carried out to predict the variation in the reflection coefficient with moisture content in oil palm fruits. A computer program has also been developed to control the data acquisition card as well as to calculate the reflection coefficient using Agilent Visual Environment Engineering (VEE) graphical programming software. The performance of the reflectometer was tested by comparing reflection coefficient results obtained from the commercial HP4195A Network/Spectrum Analyzer. Calibration equations relating the measured reflection coefficient using the reflectometer to the moisture content found by using standard oven drying method has been established. The accuracies of the calibration equations were determined by comparing the predicted moisture content with the moisture content using standard oven drying method on 50 different fruit samples and were found to be in good agreement within 5%. The reflectometer provides a simple, fast and accurate method compared to the conventional method in monitoring the various stages of fruit ripeness. Moisture - Measurement. Reflectometer. 2004-07 Thesis http://psasir.upm.edu.my/id/eprint/401/ http://psasir.upm.edu.my/id/eprint/401/1/549705_FSAS_2004_39.pdf application/pdf en public masters Universiti Putra Malaysia Moisture - Measurement. Reflectometer. Faculty of Environmental Studies English
institution Universiti Putra Malaysia
collection PSAS Institutional Repository
language English
English
topic Moisture - Measurement.
Reflectometer.

spellingShingle Moisture - Measurement.
Reflectometer.

Lee, Kim Yee
Development of a 500mhz Reflectometer Using Stripline Coupler for Moisture Measurement of Oil Palm Fruits
description This thesis describes the development of a cost effective PC-based reflectometer for the determination of moisture content in oil palm fruits to gauge its degree of ripeness. The PC-controlled reflectometer which operates at 500 MHz consists of a stripline directional coupler, two diode detectors, a data acquisition card and two open-ended coaxial sensors. The design, analysis and performance of the stripline directional coupler in conjunction with the open-ended coaxial sensors for moisture content determination of oil palm fruits are described in detail. Simulations have been carried out to predict the variation in the reflection coefficient with moisture content in oil palm fruits. A computer program has also been developed to control the data acquisition card as well as to calculate the reflection coefficient using Agilent Visual Environment Engineering (VEE) graphical programming software. The performance of the reflectometer was tested by comparing reflection coefficient results obtained from the commercial HP4195A Network/Spectrum Analyzer. Calibration equations relating the measured reflection coefficient using the reflectometer to the moisture content found by using standard oven drying method has been established. The accuracies of the calibration equations were determined by comparing the predicted moisture content with the moisture content using standard oven drying method on 50 different fruit samples and were found to be in good agreement within 5%. The reflectometer provides a simple, fast and accurate method compared to the conventional method in monitoring the various stages of fruit ripeness.
format Thesis
qualification_level Master's degree
author Lee, Kim Yee
author_facet Lee, Kim Yee
author_sort Lee, Kim Yee
title Development of a 500mhz Reflectometer Using Stripline Coupler for Moisture Measurement of Oil Palm Fruits
title_short Development of a 500mhz Reflectometer Using Stripline Coupler for Moisture Measurement of Oil Palm Fruits
title_full Development of a 500mhz Reflectometer Using Stripline Coupler for Moisture Measurement of Oil Palm Fruits
title_fullStr Development of a 500mhz Reflectometer Using Stripline Coupler for Moisture Measurement of Oil Palm Fruits
title_full_unstemmed Development of a 500mhz Reflectometer Using Stripline Coupler for Moisture Measurement of Oil Palm Fruits
title_sort development of a 500mhz reflectometer using stripline coupler for moisture measurement of oil palm fruits
granting_institution Universiti Putra Malaysia
granting_department Faculty of Environmental Studies
publishDate 2004
url http://psasir.upm.edu.my/id/eprint/401/1/549705_FSAS_2004_39.pdf
_version_ 1747810213413519360