Hysteresis compensation of photoluminescence in ZnS:Cu for noncontact shaft torque sensing
2016
This paper presents a preliminary investigation of loading rate-dependent
hysteresis of photoluminescence (PL) by phosphorescence quenching of copper-doped zinc
sulfide (ZnS:Cu) microparticles in response to dynamic torsional loading. Precision
sinusoidal torque waveforms in the frequency range of 0.5–3 Hz are used to
identify the loading rate-dependent (i.e., frequency-dependent) nonlinear hysteresis
phenomenon. The potential of the application of PL is demonstrated by successfully
measuring the sinusoidal torque applied to a rotational shaft by evaluating the loading
rate-dependent PL intensity signature using a photomultiplier tube. In addition, the
potential of noncontact shaft torque sensing is demonstrated successfully by the simple
compensation derived from ad hoc heuristic characterization.
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