Laser-spot lock-in thermography with a non-research-grade thermal camera: From thermal diffusivity measurements to visualizing free convection

Bedoya, A.; Rodríguez-Valdés, F.; Marín, E.

doi:10.1016/j.infrared.2024.105161

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2024

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Cited by 2 publications

References 37 publications

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Visualizing heat-convection using laser spot step heating thermography

Bedoya,

Rojas-Trigos,

Hernández-Wong

et al. 2024

International Journal of Thermal Sciences

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Visualizing heat-convection using laser spot step heating thermography

Bedoya,

Rojas-Trigos,

Hernández-Wong

et al. 2024

International Journal of Thermal Sciences

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Measurement of in-plane thermal diffusivity of thin films using laser periodic heating method with non-research-grade infrared camera and thermocouple detectors

Lv,

Yang,

Zhang

et al. 2024

Preprint

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The laser periodic heating method is widely used to measure the thermal diffusivity of various thin films. In this technique, surface temperature responses are monitored using either an infrared (IR) camera or a thermocouple (TC) detector. When conducted under air pressure, the effect of air heat loss on these two methods warrants further examination. In this study, we measured the in-plane thermal diffusivity of a polyethylene terephthalate (PET) film under air pressure using both a non-research-grade IR camera and a microscale TC. Results indicate that air heat loss significantly influenced TC measurements, yielding an abnormally large thermal diffusivity. Comparatively, thermal diffusivity measured by the IR camera decreased slightly with increasing modulation frequency. For films with a dimensionless thickness greater than 0.3, values obtained with the IR camera closely matched those under vacuum condition, indicating that the non-contact IR method can effectively suppress the impact of air heat loss.

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Laser-spot lock-in thermography with a non-research-grade thermal camera: From thermal diffusivity measurements to visualizing free convection

Cited by 2 publications

References 37 publications

Visualizing heat-convection using laser spot step heating thermography

Visualizing heat-convection using laser spot step heating thermography

Measurement of in-plane thermal diffusivity of thin films using laser periodic heating method with non-research-grade infrared camera and thermocouple detectors

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