Dual-Frequency Microwave Moisture Sensor Based on Circular Microstrip Antenna

A dual-frequency sensor was developed to measure moisture content of lossy liquids. The experiment is based on measurements of far-field reflection at two frequencies in the X-band, 8.48 and 10.69 GHz. The replacement of the conventional open horn antenna with microstrip radiating patches makes the...

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Bibliographic Details
Published in:IEEE sensors journal 2007-12, Vol.7 (12), p.1749-1756
Main Authors: Ghretli, M.M., Khalid, K., Grozescu, I.V., Sahri, M.H., Abbas, Z.
Format: Article
Language:English
Subjects:
Antenna measurements
Calibration
Dual microwave frequency sensor
Frequency measurement
Horn antennas
Laptop computers
Liquids
Loss measurement
microstrip antenna
Microstrip antennas
Microwave antennas
Microwave sensors
Moisture
Moisture content
Moisture measurement
Reflection
rubber latex
Sensors
X-band
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Summary:A dual-frequency sensor was developed to measure moisture content of lossy liquids. The experiment is based on measurements of far-field reflection at two frequencies in the X-band, 8.48 and 10.69 GHz. The replacement of the conventional open horn antenna with microstrip radiating patches makes the sensor more versatile and compact. The sensor is interfaced to a notebook computer using a multipurpose data acquisition board and few custom made circuits. Data collection, errors correction and calibration modules were written using LabVIEW reg programming language. Three calibration methods were used to obtain an empirical equation, which is applied to obtain the moisture content of the rubber latex samples. Moisture content can be determined with a standard error 0.49%.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2007.908920