Abstract
We proposed a non-contact and simple method for measuring the diameter and the inclination angle of slender deep hole in castings such as cylinder block for automotive products. To measure the distance to the measurement surface, three laser beams are radiated perpendicularly from the sensing probe. Then the scattered lights are led to a prism and an image conduit in the probe and finally focused on CCD sensor. As the result of experiment, we confirmed to be able to measure the diameter with a high degree of accuracy even if the sensing probe is eccentrically located.
