POROSITY DETECTING METHOD FOR METAL

摘要

PURPOSE:To accurately detect the porosity of a metal by observing a metallic sample through a microscope and picking up its image by a TV camera which connects to the microscope. CONSTITUTION:An automatic focusing device which uses air flow flux and an automatic focus controller 6 controls a focus position by a DC motor as the sample moves. Further, a stage controller 7 drives and controls the stage of the optical microscope 2 in an X-axial and a Y-axial direction by a pulse motor under the command of a personal computer 4. Then an image obtained by the microscope 2 is inputted to the interlocked TV camera 3 and sent to an image analyzing device 1. Then the image analyzing device 1 to which necessary programs and information are inputted selects only a necessary image among many images with information. The selected data is sent to the personal computer 4 and analyzed. Consequently, the porosity of the metal is accurately detected.