TELECENTRIC SYSTEMS FOR OPTICAL MEASUREME NT AND TESTING

For optical measurement and testing imaging systems are required which guarantee a constant image size for a certain range of object or imag e position. In this way three-dimensional objects can be measured with out any variation of the effective magnification within the object dep th. On the other hand such systems are not sensitive against defocussi ng. The article describes the function in principle and the potential applications of telecentric systems and shows their limits.