The deflectometry was recently stimulated by the aesthetic inspection of Class A surfaces and the optical quality of glass in the automotive and aeronautical industries.
Indeed, alternative optical methods like fringe projection or interferometric moiré have been recognized not to have a sufficient resolution.
By replacing the eye with a high resolution camera, the goal of the measurement technique is to quantify the distortion of a structured light reflected onto the inspected surface.
A structured light represented by periodic fringes is displayed on a screen, not projected onto the surface as in classical vision measuring system.
A high resolution camera observes the reflected light onto the measured surface.
Light rays are reflected on the surface and a local slope variation modifies their path.
The phase shifting deflectometry allows to measure the local slope map and, by the digital derivation, Ondulo quantifies the local curvature variations.
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