Radiant energy – Infrared-to-visible imaging
Patent
1991-03-18
1992-05-05
Fields, Carolyn E.
Radiant energy
Infrared-to-visible imaging
250340, 374 5, G01N 2572
Patent
active
051110466
ABSTRACT:
A method and apparatus for inspecting a channel through a workpiece or cooling holes through the surface of a gas turbine engine are disclosed. The gas turbine engine blade is mounted in a fixture such that a heated gas may be forced into the hollow interior of the blade during a heat-up cycle, and after a predetermined period of time, a solenoid valve switches to shut off the heated gas and to permit a chilled gas to be forced into the hollow interior of the blade for a cool-down cycle. An imaging infrared radiometer generates a series of images of the blade during both the heat-up and cool-down cycles. A selected group of parameters are determined from the series of images generated by the IR radiometer and defects within the cooling holes may then be detected by analyzing the parameters, such as a transient response of the infrared signature of the cooling holes during both the heat-up and the cool-down cycles.
REFERENCES:
patent: 3566669 (1971-03-01), Lawrence et al.
patent: 4644162 (1987-02-01), Bantel et al.
"Infrared Scanner Detects Coating Defects", Materials Engineering, Oct. 1983.
"Thermal Diffusivity Measures Thin Films", Lasers & Applications, May 1984, p. 36.
"British Seek Way to Test Composites", Tech Update, Jul. 1983.
Fields Carolyn E.
General Electric Company
Moore, Jr. Charles L.
Squillaro Jerome C.
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