Abstract
A bio-inspired film has been developed as a non-contact, deformation-based optical pressure sensor with high spatial resolution. Under appropriate excitation, the pressure-induced deformation causes variations in the film emission intensity, establishing a quantitative relationship between the pressure and the emission intensity. This relationship is strongly affected by the stiffness of the film’s basement material. To exploit this effect, we adjusted the film’s pressure sensitivity and measurement range. In a jet impingement experiment, various films with different sensitivities were calibrated. After data processing, the pressure field results were analyzed. The measurement ranges and uncertainty of the film were discussed. Furthermore, the surface displacement fields of the film were obtained by measuring the changes in images using digital image correlation, which can potentially be transformed into shear force fields after the pressure effect and shear force effect are decoupled.
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