(Product ID: FS3F-1)
The FootSTEPS system is a shear stress sensor platform for measurement of shear on a human foot. A high-resolution camera images ISSI’s Surface Stress Sensitive Film (S3F) layer, polymerized on a glass window, as participants walk across the FootSTEPS platform. The S3F layer contains a probe material that enables changes in film thickness, produced primarily by pressure, to be visualized as changes in illumination level. The mathematical ratio of loaded and unloaded images quantifies the vertical displacement of the film. A series of markers are applied to the film below the opaque upper layer. These markers are displaced laterally during foot contact, primarily by shear forces. Cross-correlation analysis quantifies the displacements produced by shear. The force plate, mounted underneath the FootSTEPS platform, simultaneously measures three forces and three moments about the x, y, and z axes. Synchronized data collection is initiated by a trigger pulse from the force plate on initial foot contact. 3-D displacement maps provide rapid visualization of the pressure and shear patterns produced by foot contact. Reconstruction of the pressure and shear force values is provided by offline analysis using a finite element model of the S3F with the measured displacements as inputs.
Data Sheet: FootSTEPS Data Sheet.pdf
User Manual: FootSTEPS User Manual.pdf
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