Dr. Jian Xu Profile

Dr. Jian Xu

at Univ of Arizona

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Proceedings Article | 20 April 2016 Presentation + Paper

High-sensitivity strain visualization using electroluminescence technologies

Jian Xu, Hongki Jo

Proceedings Volume 9803, 98030T (2016) https://doi.org/10.1117/12.2218545

KEYWORDS: Visualization, Electroluminescence, Structural health monitoring, Civil engineering, Sensors, Wheatstone bridges

Read Abstract +

Visualizing mechanical strain/stress changes is an emerging area in structural health monitoring. Several ways are available for strain change visualization through the color/brightness change of the materials subjected to the mechanical stresses, for example, using mechanoluminescence (ML) materials and mechanoresponsive polymers (MRP). However, these approaches were not effectively applicable for civil engineering system yet, due to insufficient sensitivity to low-level strain of typical civil structures and limitation in measuring both static and dynamic strain. In this study, design and validation for high-sensitivity strain visualization using electroluminescence technologies are presented. A high-sensitivity Wheatstone bridge, of which bridge balance is precisely controllable circuits, is used with a gain-adjustable amplifier. The monochrome electroluminescence (EL) technology is employed to convert both static and dynamic strain change into brightness/color change of the EL materials, through either brightness change mode (BCM) or color alternation mode (CAM). A prototype has been made and calibrated in lab, the linearity between strain and brightness change has been investigated.

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