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IJPAP Vol.50 [2012] >
IJPAP Vol.50(06) [June 2012] >
| Title: | Effect of salinity on the dielectric properties of water |
| Authors: | Gadani, D H
Rana, V A
Bhatnagar, S P
Prajapati, A N
Vyas, A D |
| Keywords: | Dielectric constant
Dielectric loss
Saline water
Sea water
Emissivity
Stogryn equations
Klein and Swift model |
| Issue Date: | Jun-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The complex
permittivity  ='-j" of distilled water and NaCl
solutions of concentrations varying from 5000 to 35000 ppm have been measured
in the frequency range from 200 MHz to 1.4 GHz using a Vector Network Analyzer
(VNA). The complex permittivity of saline water collected from Kanyakumari sea
bank has also been measured in this frequency range. It has been observed that
the dielectric constant of water decreases slowly with increase in frequency
from 200 MHz to 1.4 GHz for given salinity of water. At given frequency, the
dielectric constant decreases slowly with increase in salinity from 5000 to
35000 ppm. The dielectric loss of distilled water increases with increase in
frequency from 200 MHz to 1.4 GHz, but for saline water it decreases with
increase in frequency, over this frequency range. The decrease in dielectric
loss with increase in frequency is more for higher salinity in water. The
variation of complex permittivity of water with salinity and frequency is
calculated using the Stogryn equations [IEEE Trans. On Microwave Theory and Techniques, August 1971, pp.
733-736] as well as with the Klein and Swift [IEEE Transactions on Antennas and Propagation, Vol. AP-25, No.1, January 1977, pp. 104-111]
equations, and the results are found to be in good agreement with corresponding
experimental values. The variation of emissivity with variation of salinity
calculated at fixed frequencies of 0.5, 0.9 and
1.4 GHz have also been presented in the paper, which is very much useful for
remote sensing applications of oceans. |
| Page(s): | 405-410 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.50(06) [June 2012]
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