OVERVIEW

The measurement of geometrically defined dimensions with the "light touch" of light is appealing, as well as positively advantageous for many metrological applications. Measuring conditions created by the particular geometric forms or the insufficiently defined boundaries of object features; the not readily accessible location of the dimension to be measured; the functional interrelation of critical dimensions, materials or finishes too sensitive for mechanical contacts; and the desirability of visual observation for alignment or for contour comparison, are examples for the preferential application of optical measurements. The optical measuring instruments that provide either virtual or projected images of magnified portions of the test piece are the engineering microscopes and the optical projectors. A few models of engineering microscopes, representing advanced types, designed for versatile uses, are shown in Figs. 8-1 to 8-3.

Figure 8-1: Digital measuring microscope. A precision no contact measuring microscope interfaced to an advanced style of digital readout.

Figure 8-2: Dynascope? image projection technology style 2D non-contact measuring system. This system allows for an ergonomic viewing position of the optical image while also providing the operator with a digital readout.

Figure 8-3: Fluorescence stereomicroscope. This system is designed for stereomicroscopy and combines joystick control, buttons and a touch screen display with complete motorization.