Claims
- 1. A method of inspecting a channel, comprising the following steps:
- (a) causing the temperature of the channel to change;
- (b) measuring the transient of the infrared signature of the channel; and
- (c) comparing the measured transient with a reference.
- 2. A method of inspecting cooling channels in a gas turbine engine blade, comprising the following steps:
- (a) changing the temperature of the channels by forcing a gas through the channels;
- (b) viewing the channels with a scanning infrared radiometer and generating an image which indicates the relative intensities of black-body radiation emitted by the channels; and
- (c) comparing the intensities of paragraph (b) with each other during the initial temperature transient of the channels.
- 3. A method of inspecting the cooling holes in a gas turbine engine blade, comprising the steps of:
- (a) changing the temperatures of the holes by passing air through them;
- (b) viewing the holes using a scanning radiometer which is responsive to radiation in approximately the 9-12 micron range;
- (c) deriving at least two images at different times of the holes using the radiometer; and
- (d) comparing the images with reference images.
Government Interests
The Government has rights in this invention pursuant to Contract No. F33615-80-C-5106 awarded by the Department of the Air Force.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3566669 |
Lawrence et al. |
Mar 1971 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2125556 |
Mar 1984 |
GBX |
Non-Patent Literature Citations (3)
Entry |
"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". |