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Improved Infrared Contrast Analysis and Imaging
Improved Infrared Contrast Analysis and Imaging
When using flash IR thermography to evaluate materials, variations in the thermal diffusivity of the material manifest themselves as anomalies in the IR image of the test surface. Post-processing of this raw IR camera data provides highly detailed analysis of the size and characterization of anomalies. NASA created complementary contrast tools that offer highly precise measurements. The peak contrast and peak contrast time profiles generated through this analysis provide quantitative interpretation of the images, including detailed information about the size and shape of the anomalies. The persistence energy and persistence time profiles provide highly sensitive data giving indications of the worst areas of the detected anomalies. Peak contrast, peak time, persistence time, and persistence energy measurements also enable monitoring for flaw growth and signal response to flaw size analysis. The normalized temperature contrast profile provides more sensitive response than image contrast, allowing the system to detect smaller flaws. JSC's suite of software and tools provides more comprehensive, detailed, and accurate NDE detection and characterization of subsurface defects in nonmetallic composite materials than current methods. JSC's software normalizes and calibrates the data, therefore, providing more stable measurements and greatly minimizing errors due to operator and camera variability.
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