Nonintrusive Photoacoustic Characterization of Critical Properties in High Tc Superconducting Materials

新型高温超导体的发现 系统产生了开发兼容测量的需求 技术来表征电气，结构，声学 以及这些材料的光学性质。 尽管许多 测量常规超导材料的标准方法 材料可以适用于新的高Tc超导体系统， 临界性能的有效测量是困难的。 传统的声学技术来测量物理 超导材料的性质通常需要接触 在传感器和被测超导材料之间。 这项研究使用非接触式激光超声波作为一种 精确的、非侵入式的电子测量手段， 新型高温超导体的振动和光学性质 超导材料 圆满完成这项工作 将导致一种研究技术， 超导钙钛矿结构的表征 环境温度低于室温。 的意义 该计划是非接触的可能发展， 用于制造过程的多功能超声监测系统 和声学振动模式测量， 超导器件性能

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.