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Dual frequency microstrip antenna sensor for water content measurements independent of temperature variation


Citation

Ghretli, Mohamed Mustafa and Grozescu, Ionel Valeriu and Sahri, Mohd Hamami and Abbas, Zulkifly and Khalid, Kaida (2007) Dual frequency microstrip antenna sensor for water content measurements independent of temperature variation. Measurement Science and Technology, 18 (4). pp. 1054-1060. ISSN 0957-0233

Abstract / Synopsis

Temperature variation causes errors in all indirect moisture measurement methods. To increase the accuracy of moisture content determination and to reduce the influence of temperature, a two-parameter measurement is used. The method uses the magnitude of reflected waves at two microwave frequencies in the X-band region. A dual frequency sensor system is developed to measure moisture content of dielectric-lossy liquids. The experiment is based on measurements of far-field reflection magnitudes at two different frequencies 8.48 GHz and 10.69 GHz using circular microstrip antennas. A calibration equation is sought that instantly gives temperature-independent moisture content of the samples under consideration. The sensor is integrated with a data acquisition card to record the detected reflection signals. The data analysis and error-correction technique are implemented using custom designed software. The system is tested using diluted rubber latex with moisture content ranging from 39.8% to 91.2% wet basis. The moisture content was predicted with a standard error less than 1.3% for the temperature range of 25 °C to 63 °C compared to the standard oven-drying technique


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: 10.1088/0957-0233/18/4/013
Publisher: Institute of Physics
Keywords: microwaves, water content, rubber latex, temperature independent
Depositing User: Najwani Amir Sariffudin
Date Deposited: 04 Aug 2010 17:15
Last Modified: 30 Nov 2015 15:42
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1088/0957-0233/18/4/013
URI: http://psasir.upm.edu.my/id/eprint/7631
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