Edge measurement based on multi laser triangulation sensors

Common 2D laser profile sensors based on the well-known triangulation principle allow 2D geometry scanning of one single line. The measurement range of one sensor is limited by the angle of incidence between the receiving element and the projected laser line. For the measurement of complex form samples with great curved surfaces, one laser profile sensor from only one direction cannot scan the whole form of a sample. For example, 3D edge measurements require a cooperation scanning of more than one sensor from different directions. In this paper we present a 3D edge measurement system based on two 2D laser profile sensors, which allows edge measurements of turbine blades. The design of the experiment setup, the calibration process and the measurement results of this sensor system are discussed.