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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.40 [2011] >
IJRSP Vol.40(5) [October 2011] >
| Title: | Estimation of emissivity and scattering coefficient of low saline water contaminated by diesel in Cj band (5.3 GHz) and Ku band (13.4 GHz) |
| Authors: | Calla, O P N
Ahmadian, Nima
Hasan, Sayeh |
| Keywords: | Microwave remote sensing
Emissivity
Scattering coefficient
Diesel contaminated water
Low saline water |
| Issue Date: | Oct-2011 |
| Publisher: | NISCAIR-CSIR, India |
| PACS No.: | 84.37.+q; 84.40.xb; 92.05.Hj |
| Abstract: | In case of low
salinity or variable salinity, there is a very shallow radius of investigation.
The dielectric constant of low saline water can be significantly modified by
the presence of diesel. Techniques based on the propagation of electromagnetic
waves may be used to detect contaminant and evaluate decontamination processes.
Microwave remote sensing of diesel oil contaminated low saline water requires
the study of electrical parameters of low saline water as well as diesel such
as dielectric constant, emissivity and scattering coefficient along with their
physical parameters like surface roughness, etc. The measurement of dielectric
constant is very essential for estimating the emissivity and scattering
coefficient.
The measurement of dielectric constant of low saline water in combination with
diesel has been carried out using waveguide cell with shift in minima method in
5.3 and 13.4 GHz. Tests are conducted with samples of different salinity of
water with various amount of diesel oil. The amount of salinity is 5, 10 and 15
kppm and the amount of diesel contamination is from
40 to 280 percent with the interval of 80 percent for Cj band (5.3 GHz) and 40
to 160 percent with the interval of 40 percent for Ku band (13.4 GHz). The
estimation of emissivity and scattering coefficient have been done for incident
angles varying from 10 to 80 degree with the interval of 5 degree for both
horizontal and vertical polarization. The value of Brewster
angle has been calculated and the values of emissivity and scattering
coefficient for three look angles (45, 50 and 55) degree is presented which are
useful for designing space borne active and passive sensors. Furthermore, this
database is useful for detecting oil spills in low saline water. |
| Page(s): | 267-274 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-105X (Online); 0367-8393 (Print) |
| Source: | IJRSP Vol.40(5) [October 2011]
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