Abstract
The article aims to solve the problem of measuring the impactor velocity for dynamic hardness testers according to the Leeb, as one of the key parameters to ensure the accuracy and reliability of hardness measurements by this method. The gravitational method of impactor acceleration, used in calibration machines, and spring acceleration, typical for hardness testers, have been studied. Various technical solutions for velocity calibration are analyzed. Accurate, easy to implement, compact and inexpensive device based on fiber optic and allows monitoring the dynamics of the object without the use of additional reflective elements is developed. This system suitable for calibration or verification of dynamic hardness testers and calibration machines. The system is based on a laser interferometer in which the direct optical heterodyning of Doppler signals (Photonic Doppler Velocimetry) is applied. The maximum permissible error of the system is determined by the requirements for the metrological characteristics of the Leeb hardness calibration machine and is 0.0025 m/s at a speed of ~2 m/s. The possibility to measure the impact body velocity with an error of 0.2·10-3 m/s is confirmed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
