SOUTHWEST RESEARCH INSTITUTE

	This SwRI-developed eddy current inspection system uses a three-axis scanner to inspect the small blades of the space shuttle's auxiliary power units. The sensing coil is only 0.3 mm (0.013 in.) in diameter, to allow inspection of the blades extremely close to the disk rim.
	This SwRI-developed eddy current probe array was developed to provide improved inspection performance, speed, and coverage for turbine disks. The probe has 16 coils, which are interfaced to the eddy current instrument using an SwRI-developed multiplexer unit.

Southwest Research Institute (SwRI) engineers have experience and expertise in a variety of electromagnetic methods including:

• Eddy current

• Remote field eddy current

• Pulsed eddy current

• Electric current perturbation (ECP)

Electromagnetic Applications

• Computer modeling

• Reliability studies

• Specialized procedure development

• Specialized nondestructive evaluation (NDE) system development

• Position and orientation sensing

• Stress measurement

  • Barkhausen noise techniques

  • Magnetically induced velocity-change (MIVC) techniques

  • Nonlinear harmonics

  • Reversible permeability

  • Strain gauge measurement

Electromagnetics Capabilities and Past Projects

Selected electromagnetics capabilities and projects include:

• Using ECP for second-layer inspection of fastener holes on aircraft structure

• Magnetic property measurement of selected pipeline steel specimens

• Cladding thickness sensor

• Three-dimensional eddy current signal visualization

• Coating thickness measurement

• Remote-field eddy current

• Cast iron graphitization measurement device

For more information about nondestructive evaluation (NDE) capabilities and electromagnetics capabilities at SwRI or how you can contract with SwRI, please contact Jay Fisher, Ph.D., at jfisher@swri.org or (210) 522-2028.

| Sensor Systems and Nondestructive Evaluation (NDE) Technology Department | Mechanical & Materials Engineering Division | SwRI Home |

Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

October 03, 2008