RIU 320 Chapter Notes - Chapter 3: Lead Zirconate Titanate, Sound, Refraction
16 Dec 2019
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A sound pulse strikes a boundary between two media with normal incidence. A wave of acoustic energy is leaving soft tissue and transmitting into fat with an 86 degree incident angle. 86 degrees (the angle of transmission will be less than the angle of incidence. Fat"s propagation speed is less than that of soft tissue. The angle of transmission is less than the angle of incidence when a wave travels into a second medium that reduces that wave"s propagation speed. ) The impedance of the transducer"s matching layer is 2. 6. Mray;s and the impedance of the pzt crystal is 3. 4mrays. 1. 5 mrayls ( the impedance of the transducer"s matching layer should be between the impedance of skin and the impedance of the piezoelectric crystal. ) The propagation speed of a continuous wave is. 1. 8km/sec, the wave is then pulsed with a duty factor of.
