Cooling hole inspection

Details Cooling hole inspection Cooling hole inspection

1984-09-20

1987-02-17

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250334, 374 5, G01N 2171

Patent

active

046441620

ABSTRACT:
In the present invention, the temperatures of cooling passages in a gas turbine engine blade are changed, as by forcing a heated gas through them. The infrared signatures of the channels are measured during the initial temperature transient of the channels and the signatures are compared with a reference. The reference may be the signature of other channels on the same blade.

REFERENCES:
patent: 3566669 (1971-03-01), Lawrence et al.
"Infrared Scanner Detects Coating Defects", Materials Engineering, Oct. 1983, p. 24.
"Thermal Diffusivity Measures Thin Films", Lasers & Applications, May 1984, p. 36.
Document entitled Tech Update containing article entitled "British Seek Way to Test Composites".

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