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

Ghretli, Mohamed Mustafa and Khalid, Kaida and Grozescu, Ionel Valeriu and Sahri, Mohd Hamami and Abbas, Zulkifly (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

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1088/0957-0233/18/4/013


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.

Item Type:Article
Keyword:Microwaves, water content, rubber latex, temperature independent
Faculty or Institute:Faculty of Forestry
Publisher:Institute of Physics
DOI Number:10.1088/0957-0233/18/4/013
ID Code:7670
Deposited By: Norhazura Hamzah
Deposited On:10 Aug 2010 05:00
Last Modified:20 Aug 2010 04:22

Repository Staff Only: Edit item detail

Document Download Statistics

This item has been downloaded for since 10 Aug 2010 05:00.

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

Universiti Putra Malaysia Institutional Repository

Universiti Putra Malaysia Institutional Repository is an on-line digital archive that serves as a central collection and storage of scientific information and research at the Universiti Putra Malaysia.

Currently, the collections deposited in the IR consists of Master and PhD theses, Master and PhD Project Report, Journal Articles, Journal Bulletins, Conference Papers, UPM News, Newspaper Cuttings, Patents and Inaugural Lectures.

As the policy of the university does not permit users to view thesis in full text, access is only given to the first 24 pages only.