The rock ultrasonic spectrum analysis is an important method for the rock dynamic experiment, it has wide applied prospect.
岩石超声波谱测试技术是目前岩石力学实验研究的一种重要方法，具有广阔的应用前景。
Ultrasonic spectrum analysis is the ultrasonic testing technology which puts into use the spectrum analysis theory and approach.
超声波频域分析是把频域分析的理论和方法应用于超声检测的技术。
Chapter 3 provides primary principles and approaches of ultrasonic spectrum analysis in accordance with features of ultrasonic testing signals.
第三章针对超声波检测信号特点，给出超声频谱分析的基本原理与方法。
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