Ultrasonic Measurements Research: Progress in 1989
Annual rept. 1 Oct 1988-31 Sep 1989
NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
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The design of a practical and reasonably accurate prototype transfer calibration system for acoustic emission AE transducers has evolved in the past year. This years work involved the use of a 20 cm thick block which replaced the 3.3 cm thick plate that was found to be unsuitable. The prototype transfer calibration system was constructed and demonstrated to be workable. Results from elastic impact experiments were found to be in good agreement with theory. Formulas have been derived for the calculation of Greens functions for multi-layered media, and computer code has been written for calculation of Greens functions for single layered media.
- Test Facilities, Equipment and Methods