Method for detecting an interface between first and second strata of materials

摘要: Methods of detecting an interface between materials having different dielectric loss factors using apparatus a transmission line including inner conductor surrounded by and shielding are disclosed. Sublengths exposed along the line, with adjacent sublengths being separated shielded sublengths. In one embodiment is excited signal inserted into to predetermined depth. Signal attenuation measured. The strata identified based upon attenuation. another progressively materials. Apparatus position tracked t-he monitored as function insertion distance detect ranges substantial rate change substantially no differences in