A three-dimensional non-contact measurement system

A simple three-dimensional (3D) non-contact measurement system was proposed which consisted of a 1D laser displacement sensor and a servo control coordinate system. The laser sensor was installed on the Z-axis perpendicular to the X, Y-holding table. A filter was designed to remove the noise in the measured data. An extraction technique of characteristic points was proposed to catch the edge data points of the measured objects. Then the Hough-transform technique of image processing was employed to calculate the position and dimension of the edge of measured objects based on the extracted characteristic points. The experimental results show that this simple structure can effectively measure the position and dimension of 3D objects with reasonable accuracy.