RIU 320 Study Guide - Final Guide: Lead Zirconate Titanate, Curie Temperature, Inverse Relation

• School: GVSU
• Department: Radiation and Imaging - Ultrasound
• Course: RIU 320
• Professor: Angela Malone

Document Summary

Anything which converts one form of energy to another form of energy. Ultrasound transducers use the piezoelectric effect to convert electropotential energy to mechanical energy and mechanical energy back to electropotential. Define the piezoelectric effect and how this phenomenon creates sound waves. Piezoelectric crystals: covert electropotential (voltage) into acoustic waves and acoustic waves back to voltage. The phenomenon of mechanical deformation, which results when an electric field(voltage) is applied to certain crystal materials. Curie temperature: the temperature at which pzt is polarized, approx 300 degrees celsius. The materials such as epoxies, they will break down well before the. Curie point causing delamination and overall destruction of the transducer. A thicker crystal vibrates at a lower frequency. Frequency at which the crystal vibrates is related to the frequency of the electrical drive signal. Describe the beam shape for a single crystal transducer. Parameters: the diameter affects beamwidth and hence focus and the thickness affects the frequency.