Two fundamentally different types of sensor are used:
1. Point sensor for sequential scanning of:
- Layers/coatings on a moving object (during running production or on an x/y stage in offline operation) or
- 3D interior space topographies (e.g. cylinders) with a rotating measuring probe
2. Area sensor for 2D scanning of 3D topographies of a stationary object. Scanning of larger areas or several regions can be accomplished by moving the object
StraDex f, t series point sensors very rapidly decode the interferometrically encoded depth information by a specially developed patented procedure to permit data acquisition in sub-ms cycles.
A pointwise procedure is also used by the RayDex cr, hr sensor for scanning interior spaces. Rotation and pointwise acquisition of distance information ensure 360° coverage so that an additional axial shift yields a complete 3D data set.
A StraDex a series area sensor simultaneously illuminates a small area (typically < 1 mm2) with maximum lateral resolution. Height information is then acquired by rapid scanning of the integrated objective. Ultrafast integrated electronics and a specifically optimised data algorithm yield complete 3D data sets in 1 – 3 seconds (depending upon the size of the area measured).