Nonintrusive Photoacoustic Characterization of Critical Properties in High Tc Superconducting Materials

最近发现了新的高温超导体系统，因此需要开发兼容的测量技术来表征这些材料的电学、结构、声学和光学特性。虽然测量传统超导材料的许多标准方法可以适用于新的高Tc超导体系统，但有效测量关键性能是困难的。测量超导材料物理特性的传统声学技术通常需要传感器与被测超导材料接触。本研究使用非接触式激光超声作为一种精确、非侵入式测量新型高Tc超导材料的电子、振动和光学特性的手段。这项工作的成功完成将为在低于室温的环境下改善超导钙钛矿结构的材料表征提供一种研究技术。该计划的意义在于可能发展用于制造过程的非接触和通用超声监测系统以及用于超导器件性能的声学振动模式测量。

The recent discovery of new high temperature superconductor systems has created a need to develop compatible measurement techniques to characterize the electrical, structural, acoustic and optical properties of these materials. Although many standard methods of measuring conventional superconducting materials can be adapted to new high Tc superconductor systems, effective measurement of critical properties is difficult. Conventional acoustic techniques to measure the physical properties of superconducting materials normally require contact between the sensor and the superconducting material under test. This research uses noncontacting laser-based ultrasonics as a means of accurate, non-intrusive measurement of the electronic, vibrational and optical properties of new high Tc superconducting materials. Successful completion of this work would result in a research technique for improved material characterization in superconducting perovskite structures in environments at lower than room temperature. The significance of this program is the possible development of noncontact and versatile ultrasonic monitoring system for fabrication processes and of acoustic vibrational mode measurements for superconducting device performance.