POTENTIAL-DIFFERENCE-METHOD TERMINAL FOR DEFECT DETECTION AND DEFECT DETECTING APPARATUS

• Main Author: ANZAI HIDEYA
• Format: Patent
• Language: English
• Published: 04.08.2000
• Edition: 7
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR REACTORS; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To measure a voltage under a set pressure even in a curved surface by a method wherein a current measuring terminal and a voltage measuring terminal are connected to actuators and a prescribed contact pressure is controlled so as to be kept in a measurement. SOLUTION: Holes are made in a measuring part body 3 as an insulator so that a current measuring terminal 1 and a voltage measuring terminal 2 can be raised and lowered freely up and down. The terminals are connected to respective piston parts 5 which are machined in a terminal drive part 4. The piston parts 5 are connected to a tube 6 for identical-pressure supply. When a pressure is applied to the tube 6 for pressure supply, both terminals are moved in a direction in which they spring out from the measuring part body. When the diameter of the respective piston parts is made equal, an equal contact pressure is applied to a part to be measured, and measured data of high reproducibility can be obtained. In addition, by this structure, the length of the current measuring terminal and that of the voltage measuring terminal become long, and a noise is picked up easily. The measuring part body 3 and the pistons 5 are surrounded by a shield 7 which is composed of a conductive substance, and the shield is grounded. Thereby, an electromagnetic noise can be reduced.