System for measuring the tilt of an object

摘要: The present invention is generally directed to a system for taking displacement measurements of an object. realized by various embodiments. In one embodiment, the utilizes Moire effect take precise this regard, visible pattern disposed on object, and plurality photosensors are uniformly spaced apart from pattern. Importantly, spacing between slightly different than lines forming projection or image This allows utilize accurately compute displacements movements respect, electrical signal generated photosensor array will embody repeating envelope resulting difference in pitch has spatial frequency that significantly lower either (or projection) array, where frequencies equal reciprocal distances separating adjacent demarcations elements respectively. Thus, small lateral motion object bearing pattern, made parallel direction repetition patterns, produces relatively large shift position which frequency. Even slight can thus be readily detected Also, arrangements more arrays optics, some at angles another, used measure rotations three dimensions.