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Infra-red Thermography

Infra-red Thermography. Alex Gibson. CEE398Kuc University of Illinois at Urbana-Champaign March 2002 . Outline. Basic Physical Principles Applications Equipment References. Theoretical Basis. Thermal Imaging: Measurement and mapping of infrared energy emitted by the target .

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Infra-red Thermography

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  1. Infra-red Thermography Alex Gibson CEE398Kuc University of Illinois at Urbana-Champaign March 2002

  2. Outline • Basic Physical Principles • Applications • Equipment • References

  3. Theoretical Basis Thermal Imaging: Measurement and mapping of infrared energy emitted by the target Infrared Energy= f(T,E) “Blackbody” spectral emittance given by: (Planck's Equation) NEARIR - 0.7 to 1.3 μ (refl.) MID IR - 1.3 – 3 μ (refl.) THERMAL IR -3.0 to 30+ μ (emitt.)

  4. Emissivity Emissivity = (Actual/Blackbody) (i.e. “blackbody”; E=1.0) Nomimal Values E = f(t,λ,material,surface condition) -> a specific surface can be calibrated

  5. General Applications • Semiconductors • Medical • Law Enforcement • Military

  6. Civil Engineering Applications • Delaminations (Bridge decks) • Leaks in buried pipelines • Heat Loss analysis • Ultrasound lock-in-Thermography • (Vibrasound, ThermosoniX) • Predictive Maintanance

  7. Bridge Deck Investigation Simmultaneous visual and IR imaging of surface

  8. Pipeline investigation 1) Aqueduct 2) Oil Pipeline

  9. Active test ThermosoniX movie: Aluminium bar http://www.indigosystems.com/movie_tsx2.html

  10. Cameras (Indigo) Video Frame Rate High Frame Rate Detector Types: Source: indigo

  11. Cameras (Rayerthon) Radiometric PalmIR 500D PalmIR 225

  12. References Cameras/Equipment: www.indigosystems.com www.rayerthoninfrared.com www.stressphotonics.com Engineering Firms: www.infrasense.com www.entech-ndt.com General Interest: www.snellinfrared.com www.x20.org

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