Geometric factor of an elementary layer

In the first case the elementary layer is located between the coils of the probe (L/2 2 

In the second case the layer is located outside the probe [z L/2, z —Lj2). Then we have  

As follows from eqs. 5.46-5.47 the geometric factor of the whole space is equal to unity. 

According to eqs. 5.46-5.47 the geometric factors of elementary layers located outside the probe decrease inversely proportional to while geometric factors of elementary layers located inside the interval between coils of the probe are equal to each other regardless of z. A curve illustrating the behavior of geometric faetor Gz as a function of z is shown in Fig. 5.2. 

Values of geometric factor of elementary layers and the distance, z, between them and the middle of a two-coil induction probe are plotted along horizontal and vertical axis, respectively. 

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Proceeding from the expression for the geometric factor of an elementary layer it is not difficult to find geometric factors of a layer with a finite thickness. For this purpose it is necessary to present the layer as a sum of elementary ones and perform summation of their geometric factors. Let us consider several positions of the two-coil probe with... 

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