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Thermal imaging based on Quadriwave Lateral Shearing Interferometry (QWLSI) is able to measure temperature fields from the temperature-induced refractive index changes of the medium surrounding a heat source.
The conventional arrangement employed a continuous wave laser source to illuminate nano-particles and a wavefront analyzer (SID4Bio) to perform QWLSI. With this arrangement, a resolution of 1°C is achieved on the temperature variation measurement.
We present a system implementing a synchronous detection modality. By modulating the laser source locked-in with the SID4Bio camera we get rid of the low-frequency noise and so increase the sensitivity of the temperature variation measurement.
Antoine Federici,Hadrien Robert,Kahina Meziane,Serge Monneret,Guillaume Baffou, andBenoit Wattellier
"Highly-sensitive quantitative thermal microscopy using gold nano-particles as heat sources (Conference Presentation)", Proc. SPIE 10497, Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues XVI, 1049719 (11 June 2018); https://doi.org/10.1117/12.2290083
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