9 Molecule and Solid State Physics 9.13 Attenuation of ultrasound in solid state materials
P5160800
Attenuation of ultrasound in solid state materials
4 MHz probes, cylinder with approx. 120 mm, time-of-flight measurement with zoom ON.
Principle The damping of ultrasound in solid objects is determined for 2 (or optionally 3) different frequencies in the transmission mode.
Ultrasonic probe 2 MHz
The resulting values are then compared to the corresponding literature values. In addition, the frequency dependence of the damping effect is analysed. Furthermore, the sound velocity in acrylic objects is determined for 2 (or optionally 3) different frequencies in the transmission mode. Tasks 1. Measure the lengths of the three cylinders with the calliper. 2. Determine the amplitudes and times of flight of the ultrasonic transmission pulses for the three cylinders and the two (or three) ultrasonic probes. 3. Calculate the attenuation and sound velocity values. What you can learn about Propagation of ultrasonic waves time of flight sound velocity damping of ultrasonic waves (scattering, reflection, absorption) ▪ transmission coefficient. ▪ ▪ ▪ ▪
Main articles Basic Set Ultrasonic echoscope Extension set: Shear waves Ultrasonic probe 2 MHz Vernier caliper, plastic
13921-99 13921-03 13921-05 03011-00
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Function and Applications The 2 MHz probes are suitable for largerange use. Due to the higher frequency the axial and lateral resolution is better compared to the 1 MHz probes. On the other hand the damping of 2 MHz sound waves in most materials is not too large, so that they can be used for medium range investigations. The 2 MHz probes are suitable for measurements at medical objects and as ultrasound Dopplerprobes. Benefits ▪ The ultrasonic probes are designed to produce high sound intensities and short sound pulses. It makes them particularly suitable for pulse-echo mode. ▪ All probesare sealed in a robust metal housing andare water proof at the sensor surface. ▪ The probes are delivered with a specialplug for automatic probe recognition. Equipment and technical data ▪ Sound impedance adaptation to water / acrylic ▪ Size: L = 70 mm, D = 27 mm, Cable length: 1 m, Frequency: 2 MHz 13921-05
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