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Quadratic time difference method for underground water detection 二次时差法找水
WTS Geophysical
Quadratic Time Difference Method
for
Underground Water Detection
W.T.S Limited
W.T.S Limited
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LOGO
W.T.S Limited
CONTENTS
1. Quadratic time difference method (DT2)
1.1 Theory
1.2 Application
1.3 Feature of DT2
1.4 Attention
1.5 Parameter example
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1.1 Concept
A lot of researches indicate that there is some linear relationship between half-
decay value (St) of aquifer and excitation current (I).
As left figure, when the excitation current is
too small, the decay value will decrease as
the increase of excitation current, after reach
to the extreme value, then the value will
increase gradually as line b.
The extreme value always appeared on 0.5A,
named critical current.
The larger of porosity is and the better the
permeability is, the more quickly the curve
slope will raise, and vice versa.
On non-
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