Episode 48 - Non-Contact Deformation Measurements at Extreme Temperatures Using UV-DIC



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Non-Contact Deformation Measurements at Extreme Temperatures Using Ultraviolet Digital Image Correlation (UV-DIC)

Presenter: Prof. Ryan Berke, Utah State University

Abstract: Digital Image Correlation (DIC) uses cameras to measure surface displacements and strains by comparing images collected before and after deformation. Compared to strain gauges, DIC has the advantages that it records full-field deformation, is non-contacting, and can be used at any time or length scale depending on which cameras and lenses are used. In the case of extreme temperature measurements, it has the added benefit that it can be performed at temperatures well above which strain gauges become damaged. However, when performing DIC at extreme temperatures, care must be taken to shield the camera sensor against light emitted when a specimen glows white-hot. The emitted light is known to be brighter at longer wavelengths (e.g. red or infrared) and can therefore be screened using optical bandpass filters at shorter wavelengths (e.g. blue or ultraviolet). In this talk, we will discuss the relative importance of lighting and camera sensitivity when integrating DIC into Gleeble-style measurements at temperatures of up to at least 1600°C.
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