CRACK LENGTH MEASURING DEVICE AND METHOD WHICH MEASURE THE DC POTENTIAL VALUES OF A METAL SPECIMEN AND A CORRECTION SPECIMEN BY APPLYING CURRENT

摘要

PURPOSE: A crack length measuring device and method are provided to precisely measure the crack length of a metal specimen with crack in real time even under varying exterior temperature.;CONSTITUTION: A crack length measuring device comprises a power supply unit(100) which supplies DC constant current, a correction specimen(110) which is serially connected between a metal specimen and the power supply unit, a first voltage measuring unit(130) which measures a first DC potential difference value of the metal specimen, a second voltage measuring unit(140) which measures a second DC potential difference value of a correction specimen, and a cracking length calculating unit(150) which calculates corrected crack length by dividing the first DC potential difference value by the second DC potential difference value.;COPYRIGHT KIPO 2012