Systems, methods, and apparatuses for measuring deformation of a surface

A system for measuring displacement of a surface at a region of interest when the region of interest is exposed to a load, the system comprising:

• two cameras for capturing images of a region of interest of the surface from a perspective, the cameras each being fixed at a spatial distance apart on a movable structure such that by movement of the movable structure, either camera may be positionable into a single spatial position such that at the time of image capture the camera capturing the image is in the spatial position, each camera having a lens with a focal ratio of at least f/5, wherein when the camera is positioned at the spatial position relative to the surface, an optical axis of the lens is oblique to the surface plane;
• a load, wherein at least one of the images is captured by one of the cameras from the spatial position when the surface is not under the load, and at least one of the images is captured by the other camera from the same spatial position when the surface is under the load, and wherein the load is applied perpendicular to the surface plane near the region of interest;
• and
• a processing module of a computer, wherein the processing module:
• receives the captured images from the two cameras;
• aligns the images;
• computes pixel shift normal to the surface and pixel shift planar to the surface between the captured images for the region of interest;
• and computes physical displacement of the surface at the region of interest from the computed pixel shift.

A system for measuring displacement of a surface at a region of interest when the region of interest is exposed to a load, the system comprising:

• a first camera and a second camera, the first and second cameras being fixed at a spatial distance apart on a movable structure such that by movement of the movable structure, either camera may be positionable into a single spatial position such that at the time of image capture the camera capturing the image is in the spatial position;
• a load to be applied to a region of interest of a surface, perpendicular to the surface, wherein the first camera is moved into the spatial position relative to the region of interest and captures one or more images of the region of interest when the load is not applied to the surface, and by movement of the movable structure the second camera is moved into the spatial position and captures one or more images of the region of interest when the load is applied to the surface;
• and
• a processing module of a computer, wherein the processing module:
• receives the captured images from the first and second cameras;
• computes pixel shift normal to the surface and pixel shift planar to the surface between the captured images for the region of interest;
• and computes physical displacement normal to the surface and planar to the surface of the region of interest resulting from application of the load to the region of interest of the surface.