I conducted single loop TDEM, when I tried to use the equations to convert the data into apparent conductivity the values are very low. The loop dimensions were 60 x 60 m.
Dear Amin:
You have not given enough data for anyone to answer your question.
1) You talked about measured decay curve, so I assume that it is experimental, then you talk about TDEM method which is numerical-analytical. How does the two linked together?
2) You give the loop dimensions as 60 x 60 m, That has a dimension of a huge building of 20 story high and just as wide. How do you then set up to measure the decay curve without interference from the supporting structure for the huge loop? What supporting structure did you have? Does the supporting structure also conduct current and therefore reduces the apparent conductivity measured?
3) What wire did you use, copper and wire radius? and what decaying rate did you get?
4) What generator and waveform did you use to effect the transient.
5) What is you instrumentation for the measurement?
Leonard Chow
Sorry for incomplete question. It was TEM experiment using single-loop configuration. From my short experience in such survey we use transmitter to create the field, then we measure the the secondary field through receiver loop. The loop was horizontal therefore I am sorry I don't understand your points in item 2. The wire we use was copper with 2.5 mm radius. For decaying rate I am sorry to say I am not sure of the meaning. The decay curve I have is the plot of measured voltage with time gates from about 0.0015 ms to about 16 ms. We used TerraTem for measurement. However, my question was on the effect on the various loop configurations (single loop, coincident loop, in loop...etc). The reason is to have a tool to calibrate the measured decay curve for loop configuration.
I apologize again for my incomplete question. Thank you.
Hallo ,
you must look to a homogen field. The field Dimension must be greater than the DUT.
All the best
Gräbner
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