Engineering topics

Nummelin, J.

Publications and source records attributed to Nummelin, J..

2 records

NASA NTRS1985

Differential-Coil Eddy-Current Material Sorter

Small metal or other electrically conductive parts of same shape but different composition quickly sorted with differential-coil eddy-current sorter. Developed to distinguish between turbine blades of different alloys, hardnesses, and residual stress, sorter generally applicable to parts of simple and complex shape.

Nummelin, J.↗

NASA NTRS1983

Measuring Ultrasonic Shear-Wave Velocity

New technique improves accuracy of measurements of ultrasonic shearwave velocity. Technique eliminates need to measure incident sound angle. Technique contains groove in which steel sphere is placed. Sphere act as reference point for measuring path lengths and propagation times. Velocity measurements are within 1 percent of published data.

Nummelin, J.↗