Various embodiments include apparatus and methods that perform a homogeneous inversion processing to data or signals acquired from a multicomponent induction tool operating in a wellbore. Subsequently, an extent of wear of the blade is determined by driving the sensor in the direction of the blade to locate a second detecting position at the edge of the blade as a diameter of the blade is reduced due to dicing. An exemplary assembly includes an enclosure housing an electronic control board connected to circuit cards containing multiple laser diodes and multiple photosensor detectors. The hearing aid devices thus cause no phase or amplitude distortion, and the natural phase shift as well as the natural amplitude difference of a sound signal incident from a specific direction are thus preserved. The movable core is sandwiched between said first and second stop members.