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Thermal illumination dating of pottery

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Moore's research team is collaborating with Rolls-Royce, a leading manufacturer of jet engines."If we can correlate how the strain distribution is related to the coating's lifetime, then we could determine which coatings will fail first and shouldn't be put into an aircraft and which ones will last much longer," said Moore.Both assumptions become less realistic with the passage of time.Another problem with the TMRD is the calibration of the detector, since different crystals in an artifact can contain different amounts and/or types of luminescence material.The older the pottery, the more radiation it has absorbed and the brighter the pottery sample glows.

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IMAGE: Researchers used a tensile machine to pull a metal specimen with a ceramic thermal barrier coating sprayed on its surface.

When a small sample of ancient pottery is heated it glows with a faint blue light, known as thermoluminescence or TL.

During its lifetime the pottery absorbs radiation from its environment and it is this which creates thermoluminescence.

With a polariscope, they could measure changes in refractive index...

view WASHINGTON -- Researchers have demonstrated, for the first time, that an optical analysis method can reveal weak areas in ceramic thermal barrier coatings that protect jet engine turbines from high temperatures and wear.