2. Current pulse echometry methods
For the principle behind these methods, please refer to [D 4 543].
It should be noted that voltage pulse methods using capacitive coupling, the standing wave method, and methods using loops at the cable head have now been abandoned in France. They will not be discussed in this article. Please refer to the bibliography, mainly to the first editions of Henri HUBIN's book, for descriptions.
First, we'll look at methods requiring a voltage generator:
the direct tension method ;
comparison method 1 re form;
the 2nd form comparison method.
Then there are two methods that work with a shockwave generator:...
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Current pulse echometry methods
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