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International Journal of Photoenergy
Volume 2012, Article ID 362084, 4 pages
Research Article

Detection of Ammonia in Liquids Using Millimeter Wave Spectroscopy

1The Scientific and Technological Research Council of Turkey, Gebze, Kocaeli, Turkey
2Department of Electrical and Electronics Engineering, Yeditepe University, Istanbul, Turkey

Received 13 July 2012; Accepted 5 October 2012

Academic Editor: Ipek Karaaslan

Copyright © 2012 Hilmi Ozturk et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Detection of ammonia plays a vital role for counter-bioterrorism applications. Using millimeter wave absorption measurements, ammonia dissolved in water solution is analyzed and compared to water-only solution. The inversion of ammonia molecule results in split rotational spectral lines and transitions of these lines can be detected. Two-port measurements were carried out with vector network analyzer and measurements revealed that ammonia presence can be identified, especially between 30–35 GHz.