Practical Sprayed-on Transducer Composites for High Temperature Applications

Open Access
Ledford, Kenneth R
Graduate Program:
Master of Science
Document Type:
Master Thesis
Date of Defense:
November 09, 2015
Committee Members:
  • Bernhard R Tittmann, Thesis Advisor
  • Stephen Thompson, Thesis Advisor
  • Clifford Jesse Lissenden Iii, Thesis Advisor
  • Transducers
  • Ultrasound
  • Structural Health Monitoring
  • Non Destructive Evaluation
  • Ferroelectric Composites
  • Thick Films.
Recent work at the Pennsylvania State University has developed the materials and fabrication techniques for in-field applying of sprayed-on ferroelectric composite films, to be used as integrated transducers tolerant of high temperature environments. Thick film transducers composed of three different composite types are demonstrated, two of them being entirely new, and in field applications are demonstrated on various substrates. Measurement capabilities of single element transducers and multi-element arrays are demonstrated, including corrosion detection, guided wave transmission, pulse-echo and through-transmission material thickness measurements, as well as acoustic emission detection and localization. Data from short and long term elevated temperature testing of these transducers is presented, along with the resulting acceptable temperature ranges for operation.