A Fully Integrated Materials Framework for Enabling the Wireless Detection of Micro-defects in Aging

NOTICES Disclaimers The findings in this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. Citation of manufacturer's or trade names does not constitute an official endorsement or approval of the use thereof. Destroy this report when it is no longer needed. Do not return it to the originator. Approved for public release; distribution unlimited. Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. We present second-year results from a two-year study on a novel, inexpensive, passive, wireless solution for performing nondestructive evaluation on the structural integrity of aging aircraft. Electro-mechanical resonant phenomena in barium strontium titanate thin films have been thoroughly investigated using microwave reflectivity spectroscopy. Additionally, piezoelectric lead zirconate titanate thin films have been electrically characterized in terms of capacitance and dielectric loss tangent. Finally, we have explored the integration of such devices into a detection system involving piezoelectric wafer active transducers. barium strontium titanate, lead zirconate titanate, microwave dielectric spectroscopy, third-order nonlinear susceptibility