Simultaneous microscopic measurements of thermal and spectroscopic fields of a phase change material

Romano, M.; Ryu, Meguya; Morikawa, Junko; Batsale, Jean Christophe; Pradère, Christophe

doi:10.1016/j.infrared.2016.01.010

Cited by 16 publications

(18 citation statements)

References 17 publications

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“…The instrument in our study (described in the “Experimental Setup” section) can correct for this effect. The system has shown to have a great advantage when taking simultaneous IR spectroscopic and thermal measurements on a dynamic system to study polymerisation in microfluidics and phase change of a material . Here, we want to show that it is advantageous for a static sample as well.…”

Section: Introductionmentioning

confidence: 82%

Thermal effect on dispersive infrared spectroscopic imaging of prostate cancer tissue

Song

Ryu

Morikawa

et al. 2018

Journal of Biophotonics

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A system that combines dispersive infrared micro-spectroscopic imaging and thermography has been developed to study the effect of thermal radiation on the infrared absorption spectra of prostate biopsy samples. The system allows the distribution of thermal signal intensity as a function of emissivity to be interpreted from the integrated absorbance obtained by spectroscopic imaging. Biochemical differences between cancer and benign areas within the specimens are identified in the spectra. Side-by-side comparison of H&E stained adjacent tissue sections with infrared images constructed before and after the removal of thermal effect showed that the latter strongly support differentiation of regions within tissues. The use of spectral bands at discrete wavelengths significantly reduced spectral acquisition time, making this technique promising as a future clinical diagnostic tool. A systemic methodology was implemented to process the data, first by k-means clustering on the second derivative spectra without a priori knowledge, followed by principal component analysis (PCA). Four distinct regions within the tissue samples were successfully classified based on the antisymmetric stretching mode of the methylene functional group. Separation between data in clusters occurs when projecting spectra on a PCA score plot on a plane made by first 2 principal components. The significance of the disparity was verified with statistical test. Regulation of signal to chopper and detector enables simultaneous acquisition of infrared and thermal images of the prostate biopsy tissues.

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Section: Introductionmentioning

confidence: 82%

Thermal effect on dispersive infrared spectroscopic imaging of prostate cancer tissue

Song

Ryu

Morikawa

et al. 2018

Journal of Biophotonics

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“…As a consequence, the spectrum in figure 3.a seems to have a very important thermal dependency w hereas they are mainly affected by the proper emission dependency. This illustrates the first interest of the tw o images technique [5][6] that is to have the possibility to subtract this thermal dependent baseline. Then, by making this subtraction, only the spectrum as function of temperature can be plotted in figure 3.b.…”

Section: Example Of Recorded Data In Digital Level (Dl) As Functionmentioning

confidence: 88%

“…The infrared spectra w ere acquired using the synchronization of the monochromator and the IR camera by using a mechanical chopper w ith homemade LabVIEW softw are to control the acquisition frequency and to scan the w avelength over the domain of interest. As a consequence, w ith the set-up described in figure 1, and as already demonstrated in previous papers [5][6] the acquired signal is based on tw o images techniques w hich are function of several contributions as follow :…”

Section: Experim Ental Set-upmentioning

confidence: 98%

Multispectral IR thermotransmittance technique for temperature measurement

Pradère¹,

Ryu²,

Sommier³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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The goal of this w ork is to reinforce the recent observed giant sensitivity of thermotransmittanc e technique in far infrared w avelength (millimetric one) by transposing such technique in the mid infrared region. Here, the thermotransmittance coefficient determined at IR multiw avelength from 3 to 5 µm and for several semi-transparent media (Silicon, Sapphire) is reported. The major result is the sensitivity dependency of the transmittance coefficient to the IR spectrum of studied material as w ell as the good relative sensitivity. As a consequence tomographic and non-contact multispectral temperature measurement could be considered w ith this method.

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“…Recently, a novel system [14][15] developed by our team, that combined two imaging techniques enabled simultaneous measurements of IR spectroscopic and thermal imaging at multiscale of the time and space. The thermal and the spectroscopic images are alternatively recorded with the synchronized signal from a chopper that attains the high simultaneity in the measurement.…”

Section: Introductionmentioning

confidence: 99%

“…The thermal and the spectroscopic images are alternatively recorded with the synchronized signal from a chopper that attains the high simultaneity in the measurement. Previous measurement [15] performed in steady state demonstrates the ability of the set-up to record concentration and temperature fields simultaneously during phase change of n-Eicosane (C20H42) in steady state with a 5 ms time interval and with a spatial resolution of 4 m.…”

Section: Introductionmentioning

confidence: 99%