Long Life Potentiometric Position Sensor - Its Material and Application

Self-Diagnostic and Self-Compensation Methods for Resistive Displacement Sensors Tailored for In-Field Implementation

“…The parameters R c and ξ offer the advantage to directly relate the measurable sensor electrical characteristics with the elements that are most susceptible to wear and faults, i.e., the sliding cursor and resistive track [ 23 ]. Although more parameters could be taken into consideration to obtain a more detailed sensor model, R c and ξ already allow the identification of the most common causes of wearout and failure for resistive displacement sensors, at the same time avoiding excessive model complexity.…”

“…The resistive element wear debris deposited between the sliding cursor and the resistive element increases the contact resistance R c because the contact area decreases, and the debris acts as an insulator. In addition, creep and fatigue in the sliding cursor brush cause the contact force to decrease, again increasing R c [ 23 , 25 ]. With respect to possible mechanical damage, the breakout of the sliding cursor opens the electrical contact between the resistive and conductive tracks, leading R 12 and R 23 to infinity, as well as R c .…”

“…The parameters R c and ξ are known to play a crucial role in defining the conditions of the resistive displacement sensor as they are directly affected by sensor wearout and faults [ 23 ]. Therefore, the proposed fault detection method focuses on assessing progressive sensor wearout or sudden failure by comparing the variation in R c and ξ with reference values by means of alarm thresholds.…”