Periodic projection of a random spatial pattern for the assessment of the in-plane thermal diffusivity

Paolo Bison; Giovanni Ferrarini; Christ Glorieux; Junko Morikawa; Nicolò Morselli; Shuji Kamegaki; Stefano Rossi; Meguya Ryu

doi:10.1117/12.3014081

7 June 2024 Periodic projection of a random spatial pattern for the assessment of the in-plane thermal diffusivity

Paolo Bison, Giovanni Ferrarini, Christ Glorieux, Junko Morikawa, Nicolò Morselli, Shuji Kamegaki, Stefano Rossi, Meguya Ryu

Author Affiliations +

Proceedings Volume 13047, Thermosense: Thermal Infrared Applications XLVI; 1304710 (2024) https://doi.org/10.1117/12.3014081
Event: SPIE Defense + Commercial Sensing, 2024, National Harbor, Maryland, United States

Abstract

This work deals with the characterization of biochar deposited on a thin metallic sheet, used to enhance the evaporation in heat exchangers. The effectiveness of such deposit is done by means of the heated thin foil thermographic technique. The thermal diffusivity of the foil is the main objective of this study. In the proposed method, a pulse of 2 ms duration is produced by a laser, and periodically projected on the surface of an opaque sample of which the thermal parameters have been determined by classical measurements. The spatial distribution of the laser light pattern is random, after passing through a mask like a QR code. Several masks with different spatial features and distribution were prepared by sputtering thin layer (100 nm) of gold on a piece of glass covered by a pattern. Using the masks, samples were photothermally excited by impulsive laser light patterns. The resulting dynamic temperature field evolution at the sample surface was observed by a fast IR camera in the LW, and the thermal diffusion process was recorded by a sequence of IR images. In this contribution, a theoretical model is described and utilized to analyze the spatiotemporal dependence of the temperature field.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Paolo Bison, Giovanni Ferrarini, Christ Glorieux, Junko Morikawa, Nicolò Morselli, Shuji Kamegaki, Stefano Rossi, and Meguya Ryu "Periodic projection of a random spatial pattern for the assessment of the in-plane thermal diffusivity", Proc. SPIE 13047, Thermosense: Thermal Infrared Applications XLVI, 1304710 (7 June 2024); https://doi.org/10.1117/12.3014081

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