Use of Direct Optical Heterodyning for Measuring Hardness by the Leeb Method
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In this paper, we describe a portable system for measuring the indenter velocity in hardness meters implemented according to the Leeb method. The developed system is a fiber interferometer, in which a radiation source is a semiconductor laser with a wavelength of 1550 nm. The presented experimental results confirm the ability of the system to measure indenter velocities with an uncertainty of 0.001 m/s, which satisfies the requirements of the standards for this method of measuring hardness.
Keywords:fiber interferometer PDV hardness measurement Leeb method.
This work was supported by the Russian Science Foundation, project no. 17-72-20164.
CONFLICT OF INTEREST
The authors declare that they have no conflict of interest.
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