Principle introduction - Ultrasonic contact impedance Method (UCI method)

In 1961, Dr. Claus Kleesattel, an American, invented the UCI ultrasonic impedance measurement principle in order to solve the problems of long test time of desktop Vickers hardness tester, high requirements for the operator to observe the indentation, and unable to measure the site. The hardness tester designed by the ultrasonic impedance measurement principle is called ultrasonic hardness tester.

The principle of UCI ultrasonic impedance measurement is to use a spring to produce the test force required for Vickers hardness measurement. The test force is applied to the user's workpiece through a vibration rod. The front end of the vibration rod is inlaid with a 136-degree standard diamond indenter, which forms a Vickers diamond indentation on the workpiece. The diagonal length of indentation

Corresponding to vickers hardness, indentation diagonal length and vibration rod frequency changes into a corresponding relationship, so the vibration rod frequency changes can be known from the workpiece hardness.

Because of the use of standard Vickers indenter and test force, the ultrasonic hardness tester can directly measure the vickers hardness of the workpiece. Ultrasonic hardness tester is a kind of Vickers hardness tester.