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This paper describes an implantable system for the in vivo measurement of both micromotion and migration in applications such as total hip arthroplasty (THA) and total knee arthroplasty (TKA). The system is based on a modified form of linear variable differential transformer (LVDT) whose null-point is set automatically by means of a self-calibration algorithm. The self-calibration process not only...
A high-accuracy system for calibration of Rogowski coils at frequencies up to 10 kHz, based on a reference current transformer, an I/V converter, and a digital sampling system, is described in the paper. The calibration system has been automated and its performance evaluated. At the frequency of 10 kHz, the calibration system is capable of generating currents up to 100 A. At power frequencies, it...
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