| Autor: |
Gieske, John H., Frost III, Harold M. |
| Předmět: |
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| Zdroj: |
Review of Scientific Instruments; Dec1991, Vol. 62 Issue 12, p3056, 5p |
| Abstrakt: |
This paper describes a PC-based automatic measuring system for ultrasonic velocity and attenuation changes in highly attenuating green-body ceramics during sintering temperatures. The system uses pulse-echo/through-transmission buffer rod technique and records pulseecho and through-transmission waveforms at programmed time or temperature intervals. Data can be taken without interruption during temperature schedules lasting many days. Archival files of the waveform data are saved on disks for later analysis. Accuracy of the technique is demonstrated for solid fused silica for which dynamic resonance and Brillouin scattering data of the longitudinal velocity are compared at temperatures up to 1200 °C. The system has been used successfully for measuring longitudinal velocity and attenuation changes at 5 MHz during sintering of ZnO-based varistor materials and YBa[sub 2]Cu[sub 3]O[sub x] superconducting ceramics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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