A monochromatic-light-interference system for measurement of diamond-indenter’s angle parameter

The geometrical error of diamond indenter has much infection on the uncertainty of hardness measurement, especially for Rockwell hardness. Based on the system we realized an angle parameter measurement system for diamond indenter using monochromatic interference method and specially designed table. This paper analyses the system’s accuracy in detail. Standard angle block is specially designed for traceability of the system, of which the uncertainty can achieve $0.02^{\circ}(k=2)$. The application of the system to diamond indenter measurement is verified by the experiment using Rockwell diamond indenter.