Dynamic torsional response analysis of mechanoluminescent paint and its application to non-contacting automotive torque transducers

Abstract

This paper presents the result of a preliminary experimental study on the dynamic torsional response analysis of mechanoluminescent (ML) paint for potential development as a new type of non-contacting torque transducer. The torsional torque applied to a transmission shaft is measured by sensing the ML intensity emitting from an ML paint coating a transmission shaft. This study provides the fundamental knowledge for the development of new non-contacting torque sensing technology based on the ML intensity detection. The proposed measurement principle appears to offer potential applications in automotive torque measurement systems, even though the loading rate-dependent characteristics of the ML intensity needs to be examined further.

Trap-controlled mechanoluminescent materials

“…28c and d) is linked to the presence of unfilled traps in the ML material, i.e., the de-trapped carriers are re-trapped by the unfilled traps, rather than by transitioning to a state that decays with the emission of light. Kim's group has applied the continuous excitation condition to study ML systems including one that led to the development of a new class of ML torque sensor (Section 7.1) [179,254]. Notably, ML studies using the continuous excitation condition have been limited to SrAl 2 O 4 :Eu 2+ ,Dy 3+ (Sections 4.9.2 and 4.9.3).…”

Elastico-mechanoluminescence and crystal-structure relationships in persistent luminescent materials and II–VI semiconductor phosphors

“…[1][2][3][4][5][6][7][8][9][10]. Jeong et al [8][9][10] have demonstrated that the composite film containing ZnS:Cu, Mn and ZnS:Cu phosphors in a polydimethylsiloxane (PDMS) matrix can be used to produce light source, multicolour displays, and wind-driven light sources.…”

A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications

“…As an example in Figure 1a,b, the instantaneous ML intensity induced by elastic deformation of SrAMgSi${}_2$O${}_7$:Eu${}^{2+}$ (A = Ca, Sr, Ba) is proportional to the stress load applied at a fixed rate [11]. Based on the linearity between ML intensity and stress, the stress distribution of a composite under compression [12], tensile load [13], torsion [14,15], ultrasound radiation [16] or vibration due to gas flow [17] has been estimated by this ML-based method. The stress field and wake in the vicinity of a crack [18,19], and its propagation [20,21] can also be visualized in an in situ manner thanks to ML phosphors.…”