Microwave dielectric properties of rubber and oil palm leaf samples: Measurement and modelling
作者:
H. T. Chuah,
S. W. Kam,
Y. H. Chye,
期刊:
International Journal of Remote Sensing
(Taylor Available online 1997)
卷期:
Volume 18,
issue 12
页码: 2623-2639
ISSN:0143-1161
年代: 1997
DOI:10.1080/014311697217503
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
This paper contains the results of measured dielectric constants of leaves of two tropical crops, rubber ( Heavea brasiliensis ) and oil palm ( Elaeis guineensis ) at microwave frequency region. Using a microcomputer-based automated system consisting of a Wiltron 360B vector network analyser,measurements are conducted based on the waveguide thin sheet technique. Leaf samples are inserted within waveguide sections, and the dielectric constants are calculated from the complex reflection coefficients. The measurements cover a frequency range of 4-18GHz. In general, the dielectric constant of a leaf sample is a function of water content and frequency. Theoretical calculations from three dielectric mixing models, i.e., the Debye-Cole Dual-Dispersion dielectric model by Ulaby and Rayes, Matzler's Model and Carlson's Model are compared with the measurements. From the comparisons, the dual-dispersion model is found to show more promise in prediction of the dielectric constants, if proper physical parameters of the model, such as bound and free-water volume fractions, are used.
点击下载:
PDF (308KB)
返 回