Technologies > Photogrammetry > Precision

Photogrammetry is uniquely qualified to provide means to quantify the surface characteristic of thin film shells as it is non-contactive. In its pursuit of improved shell figure, Mevicon Inc. personnel have developed many specialized techniques and approaches to realize high precision photogrammetry. Average measurement dynamic range of 200,000:1 (2.5 micron rms error to best fit surface over 0.5 m diameter object size) versus an independently Zeiss CMM calibrated test object has been demonstrated. Back to back repeatability is better than 1 micron rms. Spatial sampling frequencies of 10 to 20 mm (point to point on square) are typically used.