EVALUATION OF THE UNCERTAINTY DUE TO ABBE’S ERROR FOR PRIMARY ROCKWELL HARDNESS STANDARD SYSTEM
Sheau-shi Pan, Chiu-Hsien Chen, Chi-Sheng Chang
Abstract:
The Primary Rockwell Hardness Standard System was established in the Center for Measurement Standards since July 1996 till June 1997. During the time, a laser interferometer, HP10737R 3-axis compact interferometer system, was substituted for the optical linear scale and combined with the mechanical structure of the original system to measure the Rockwell Hardness nominated values from 20 HRC to 70 HRC. Subsequently the laser interferometer was performed the measurement of the pitch and yaw of the indenter when the hardness was measured; then we evaluated the uncertainty caused by the Abbe’s error, pitch and yaw. The results showed that the expanded uncertainty of the primary Rockwell hardness standard system due to the Abbe’s error of the indenter was 0,046 HRC at the confidence level of 95%. The expanded uncertainty caused by the angle difference between the indenter moving axis and the measuring optical path was 0,0028 HRC at the confidence level of 95%.
Keywords:
Rockwell hardness, 3-axis compact interferometer, diamond indenter
Download:
PWC-2003-TC5-008.pdf
DOI:
-
Event details
Event name:
XVII IMEKO World Congress
Title:

Metrology in the 3rd Millennium

Place:
Dubrovnik, CROATIA
Time:
22 June 2003 - 28 June 2003
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