Molecular Luminescence Sensing for Global Strain Measurement

摘要

Luminescent photoelasticity is a new approach to measure mechanically induced strain on structural components. The technique incorporates a luminescent dye that partially preserves the stress-modified polarization state within a birefringent coating and provides high emission signal strength at oblique surface orientations. These characteristics can facilitate determining the principle strains and directions on complex geometries, without additional experimental or analytical techniques, by exploiting the angle dependent emission from multiple camera and/or illumination orientations. This paper presents a brief overview of the technique and a newly initiated research program sponsored by the NSF. Resulting advancements of the research are expected to integrate luminescence sensing for strain measurement into time-demanding product design cycles, validate complimentary computational methods, and provide a foundation to expand into critical need areas such as structural health monitoring in civil, automotive and aerodynamic applications.