3 Oscillations and Mechanical Waves, Acoustics 3.3 Sound Waves
Velocity of ultrasound in solid state material
P5160100 Principle The velocity of sound in acrylics shall be determined by time of flight reflection technique with an ultrasonic echoscope. The measurements are done, by reflection method, on three cylinders of different length. Two measurement series are carried out with ultrasonic probes of different frequencies.
For more details refer to page 229.
Attenuation of ultrasound in solid state materials
P5160800
Principle The attenuation of ultrasound in solid bodies (polyacrylic) is measured at three different frequencies using a reflection method and by scanning through the bodies with an echoscope. The results give an indication of how attenuation depends on frequency.
For more details refer to page 230.
Shear waves in solid state materials
P5160900 Principle An echoscope is used to measure the emergence of longitudinal and transverse waves when sound passes through flat rectangular blocks made of differing materials. The relationship between amplitude and angle can be used to determine the speed of sound in the blocks in longitudinal and transverse directions and these results can then be used to determine the coefficient of elasticity for those materials.
For more details refer to page 231.
excellence in science 80