DURIP: RF Material Measurement Equipment
Abstract
Tonpilz designs utilizing PMN-PT single crystal materials show improved performances over traditional PZT ceramic-based transducers. Higher potential source level and larger system bandwidths have already been demonstrated. Single elements have also been tested for their high power capability. The overall source level potential was found to be limited by the mechanical stresses and temperature rise in the stack, due to strain and polarization non-linearity, which accelerated heating and generated harmonic distortion. This increase in temperature also changes the dielectric constant of the crystal by more than 40 percent from room temperature to 50 degrees C. In the main Phase I STTR program, these issues, along with issues of material cost, availability, and crystal size were studied to continue development of single crystal technology. This STTR is exploring a few options to tailor the piezoelectric, dielectric, and mechanical properties in the PMN-PT system to improve the high drive characteristics, including the mechanical and dielectric quality factors and Curie temperature. A number of conclusions were made regarding the PMN-PT compositions after characterizing and modeling them, and the primary objective of this option is to directly compare the performances of prototype transducers made from the compositions, both between the different designs and with current tonpilz transducers used in high power applications.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 30, 2005
- Accession Number
- ADA442542
Entities
People
- Kevin A. Snook
- Paul W. Rehrig