ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
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( f )<br />
v<br />
=<br />
ε '<br />
⎡<br />
c<br />
2<br />
( f ) ⎢<br />
⎛ ε"<br />
( f ) ⎞<br />
1+<br />
1+<br />
⎜ ⎟<br />
⎢ ( ) ⎥ ⎥ 2 ⎝ ε ' f ⎠<br />
⎣<br />
⎦<br />
⎤<br />
(62)<br />
where c is the velocity of light in free space.<br />
The increase of temperature of the salt-water mixture increases the frequency<br />
range around the frequency 1 GHz, where the velocity of propagation of<br />
electromagnetic wave along the waveguide, used in TDR technique, does not<br />
change. Therefore the temperature effect on the electrical conductivity of soil,<br />
resulting mainly from ionic conductivity of soil electrolyte should not influence<br />
the bulk temperature effect of soil dielectric permittivity.<br />
68