Pulsed dilatometric method and device for the detection of delam

Thermal measuring and testing – Thermal testing of a nonthermal quantity – Expansion or contraction characteristics

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356358, 374 57, G01N 2516

Patent

active

047521406

ABSTRACT:
A method for the detection of delaminated areas in coated materials or layered composites, which allows free-air operation and can be used to scan portions of bulky materials on the spot. This method which makes it possible to detect very small delaminated areas in a very short time (less than 1 millisecond), with a very high sensitivity and without creation of excessive thermal stress in the inspected material, basically comprises the steps of: focusing pulsed, thermal radiations onto the structure to be inspected to produce a vertical displacement of its coating by thermal expansion if a delaminated area is present at the coating-to-substrate interface, and detecting and measuring this vertical displacement if any, by interferometry, preferably laser-beam interferometry. An apparatus for carrying out this method is also disclosed.

REFERENCES:
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patent: 4243327 (1981-01-01), Frosch et al.
patent: 4484820 (1984-11-01), Rosencwaig
patent: 4513384 (1985-04-01), Rosencwaig
patent: 4521118 (1985-06-01), Rosencwaig
"Thermoelastic Inspection of Layered Materials: Dynamic Analysis" P. Cielo et al, Materials Evaluation-Aug. 1985.
"Optothermal NDE of Thermal-Barrier Coatings", P. Cielo et al presented at 1985 ASM Metals Congress-Toronto, Oct. 12-17, 1985.

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