@inproceedings{f44af37530b245c5b18b115994618f80,
title = "Heat Flow Visualization and Thermal Anomaly Detection Using Phase Measuring Deflectometry",
abstract = "This study demonstrates Phase Measuring Deflectometry (PMD) as an optical technique for visualizing heat flow and detecting thermal anomalies in metallic materials. Heat conducted from a thermally loaded sample into an adjacent transparent medium induces spatial refractive index gradients, which distort a projected fringe pattern. These distortions are captured and analysed using PMD, enabling emissivity-independent visualization of the heat flow field. Experimental results on aluminium and structural steel slabs reveal distinct phase signatures linked to thermal conductivity differences. The method offers a compact, non-invasive, and surface-independent alternative to conventional thermography, well-suited for engineering diagnostics and material evaluation.",
keywords = "Emissivity-independent measurement, Heat flow visualization, Phase Measuring Deflectometry, Refractive index gradient, Subsurface anomaly detection",
author = "Ragni Trivedi and Shivam Sharma and Vismay Trivedi and Rahul Sharma and Groves, \{Roger M.\} and Gyanendra Sheoran and Arun Anand",
year = "2025",
doi = "10.1117/12.3066632",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Peter Lehmann and Wolfgang Osten and Goncalves, \{Armando Albertazzi\}",
booktitle = "Optical Measurement Systems for Industrial Inspection XIV",
address = "United States",
note = "14th Optical Measurement Systems for Industrial Inspection ; Conference date: 23-06-2025 Through 27-06-2025",
}