A DEVICE FOR THE MEASURING VELOCITY AND ATTENUATION OF ULTRASONIC WAVES IN SOLID SAMPLE AT LOW TEMPERATURES UPTO 90K

摘要

A device for the measurement of ultrasonic velocity and attenuation in solid samples at low temperatures, such as over a wide range of temperature from 90 to 303 K which essentially consists of a novel spring loaded arrangement which provides a good contact, gentle and uniform pressure between the crystal and solid sample. The necessary cooling / heating of the sample can be selected depending on the requirements. The device of the present invention makes it possible to measure the ultrasonic velocity and attenuation in solid samples using both through transmission technique and pulse echo method. The above setup also permits use of a low thickness of sample in the order of mm to cm range.