Measuring device for surface profile of workpiece - has reference surface and transducer determining distance between surfaces

摘要

There is an element extending over at least the length of the surface to be measured, and the element is held under tension. It forms a reference surface with which the measured surface is compared. A distance transducer generates an output signal representing the distance between the two surfaces. The transducer is moved over the length of the tested surface. A carriage (20) is used, running on rollers (22). It has a yoke with two sensors monitoring its position relative to a reference wire (10). This wire consists of a bundle of carbon fibres under tension to give a straight reference line. There are sliders (14) running on tubes (8) lying parallel to the longitudinal motion of the carriage.