Microscopic thermal diffusivity mapping using an infrared camera
Standard flash thermal diffusivity measurements utilize a single-point infrared detector to measure the average temperature rise of the sample surface after a heat pulse. The averaging of infrared radiation over the sample surface could smear out the microscopic thermal diffusivity variations in some specimens, especially in fiber-reinforced composite materials. A high-speed, high-sensitivity infrared camera was employed in this study of composite materials. With a special microscope attachment, the spatial resolution of the camera can reach 5.4 {micro}m. The images can then be processed to generate microscopic thermal diffusivity maps of the material. SRM 1462 stainless steel was tested to evaluate the accuracy of the system. Thermal diffusivity micrographs of carbon-carbon composites and SCS-6/borosilicate glass were generated. Thermal diffusivity values of the carbon fiber bundles parallel to the heat flow were found to be higher than the matrix material. A thermal coupling effect between SCS-6 fiber and matrix was observed. The thermal coupling and measured thermal diffusivity value of the fiber were also dependent upon the thickness of the specimen.
- Research Organization:
- Oak Ridge National Lab., High Temperature Materials Lab., TN (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 666019
- Report Number(s):
- ORNL/CP-97540; CONF-9710119-; ON: DE98004932; BR: EE0403000; TRN: AHC29819%%174
- Resource Relation:
- Conference: 24. international thermal conductivity conference, Pittsburgh, PA (United States), 26-29 Oct 1997; Other Information: PBD: [1997]
- Country of Publication:
- United States
- Language:
- English
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