$16.6k Research Instrumentation in support of non-contact ultrasonic imaging STIR
Abstract
A hydrophone and power amplifier will be purchased to investigate non-linear acoustic effects at non-linear acoustic interfaces to maximize transmission into media of interest. The requested instrumentation will allow the generation of high frequency acoustic waves, their direction into an interface, and measurement of the acoustic signal in the interface, in order to understand the details of non-linear conversions at the interface itself. Theoretical analysis indicates that the phase and momenta relationships of multiple acoustic beams intersecting an interface can be optimized to significantly enhance transmission of the non-linear product signals across the interface. Additionally a material interface is often capable of supporting unique modes that may mediate bulk acoustic modes on either side of an interface via nonlinear resonances. The first interface to be investigated is the air / water inferface. Success with this interface will encourage progression to the interface between air and a human body surrogate. Followed by investigation of the interface between air and human body with wet and dry heavy fabric covering dielectric material (explosive surrogate) and metal (weapon surrogate). Followed by investigation of air / soil interface, with different soil moisture and chemical characteristics, which may require lower frequencies.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 12, 2017
- Source ID
- W911NF1510633
Entities
People
- Seth Putterman
Organizations
- Army Contracting Command
- United States Army
- University of California, Los Angeles