Analogic Engineering, Inc.
ElectroMagnetic Acoustic Transducer (EMAT) Research
2002 NSF SBIR Phase I Feasibility Study grant no.
DMI-0128698, “Using Variable Polarization
Ultrasonic Shear Waves to Isolate and Quantify the Competing Effects of
Microstructure and Stress on the Acoustic Properties of Steel.” Developed a proprietary
Electro Magnetic Acoustic Transducer (EMAT) and instrumentation that uses
variable polarization shear waves to measure longitudinal stress in steel.
2008 EMAT testing conducted on aluminum and
stainless steel containing engineered defects (EDM and water-jet cut notches) that
clearly indicated the presence of cracks. Of particular interest, defect
indications showed cracks on the far surface and cracks located within pits.
2009 QNDE Annual Meeting in Rhode
Paper titled “Polarized Shear Waves
for Crack Detection and Characterization” by S. J. Turner and B. W. Maxfield
published in Review of Progress in Quantitative Nondestructive Evaluation, Vol.
NSF SBIR Phase I Feasibility Study grant no. IIP-1014355
Contrast to Locate and Size Defects."
Developed mathematical model to prove feasibility of detecting and sizing
defects in steel structures and components using the EMAT, custom instrumentation
Features & Benefits of the AEI EMAT
couplant liquid or gel required
near-surface, far-surface and volume defects
dangerous cracks from benign anomalies
inaccessible areas such as inner or outer tank and pipe surfaces from the
pipes and tanks from the outside surface
need to empty contents or clean test surface
in high temperature areas
operation while testing
signal processing to automate defect detection
EMATs For Industry
& Storage Vessels
& Bridge Structures