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第一节圆柱体试祥的电导率、磁导率和直径一、一些假定在研究圆筒形试验线圈中的长圆柱体试样的电导率σ、相对磁导率μ_(rel) 和直径 d 的影响时,我们仍采用与前一章分析有效磁导率相同的假定。试样性质影响了特性函数值,它为1-η+ημ_(rel)μ_(eff)这个特性函数包括了对涡流试验有影响的基本因素:1.由频率比 f/f_(?)决定的有效磁导率μ_(eff).2.为试样物理性质(σ、μ_(rdl)、d)函数的界限频率f_(?)。3.为仪器特性的试验频率 f。4.由试样直径 d 和试验线圈内径 D 所决定的填
Section I. Conductivity, Permeability, and Diameter of a Cylinder Trial Some examples assume that the conductivity, σ, relative permeability μ, and diameter d of a long cylindrical specimen in a cylindrical test coil , We still use the same assumptions made in the previous chapter to analyze the effective permeability. The property of the sample affects the value of the characteristic function, which is a function of 1-η + ημ_ (rel) μ_eff. This basic function of the eddy current test includes the following factors: 1. From the frequency ratio f / f_ The effective permeability μ_ (eff) .2 is the limiting frequency f_ (?) Of the function for the physical properties of the sample (σ, μ_ (rdl), d). 3 for the instrument characteristics of the test frequency f. 4 by the sample diameter d and the test coil diameter D determined fill