NASA NTRS · 19700000012
Sonic impedance technique detects flaws in polyurethane foam spray-on insulation
Abstract
Sonic impedance testing detects voids and unbonded regions as small as 1 inch in diameter by 0.03 inch thick. Measurements are made manually or by automatic scanning and the readout is made by meter or recorder.
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Haralson, H. S., Haynes, J. L.. 1970-08-01. Sonic impedance technique detects flaws in polyurethane foam spray-on insulation. https://ntrs.nasa.gov/citations/19700000012
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