【摘要】 本装置用超声脉冲回波与定标指数波形比较的方法测量超声衰减。使用的频率范围是5—55MHz,衰减系数测量范围是0.01—3dB/μs,固体中声速的测量精确度是±0.1％。用本装置测量了纯铝单晶中的内耗。更多还原

【Abstract】 An instrument for measuring ultrasonic attenuation by means of comparing the ultrasonic pulse echo with a calibrated exponential decay wave-form is described. This instrument is designed to make ultrasonic measurement in the frequency range of 5MHz to 55 MHz and in the attenuation coefficient range of 0.01dB/μs to 3dB/μs. It is capable of . making sound velocity measurements in solid with an accuracy of±0.1%. Internal friction in a single crystal of pure aluminium was measured with this equipment.更多还原