Semi-empirical approach for the analysis of infrared photothermal microscopy

Paoloni, S.; Fournier, D.

doi:10.1063/1.1511296

Cited by 7 publications

(2 citation statements)

References 5 publications

(6 reference statements)

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“…Both diffraction and the nonlinear transfer function have been considered by Fournier and coworkers. 39,41,42 In their work, it was shown that accurate measurements of D could be obtained by carefully accounting for diffraction and the nonlinear transfer function. However, this approach requires knowledge of both the AC and DC temperature rise.…”

Section: Methodsmentioning

confidence: 99%

Local measurement of bulk thermal diffusivity using photothermal radiometry

Hua

Schley

Hurley

2022

Review of Scientific Instruments

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An experimental methodology using photothermal radiometry is developed for the accurate measurement of bulk thermal diffusivity of nuclear fuels and materials irradiated to high doses. Under these conditions, nuclear fuels, such as uranium oxide, and moderator materials, such as graphite, become friable, which requires characterization techniques that can accommodate irregularly shaped fragments. Photothermal radiometry, a good candidate for this application, involves locally heating a sample by using a laser and measuring the temperature field by monitoring blackbody radiation. The interaction volume for this study, less than a millimeter, is carefully chosen to sample a statistically significant number of large-scale structural features, such as pores and gas filled bubbles, and is small enough that the sample fragments can be treated as a thermal half-space. The thermal diffusivity standards considered in this study cover a range of thermal diffusivities representative of both fresh and spent nuclear fuels. We also consider a sample having a porous microstructure representative of large-scale structures found in materials irradiated to high doses. Our measurement methodology circumvents complex thermal wave models that address optical diffraction, nonlinear transfer function associated with blackbody radiation, and finite sample size effects. Consequently, the large measurement uncertainty associated with modeling these effects can be avoided. While the emphasis here is on nuclear fuels and materials, this measurement approach is well suited to measure thermal transport in a variety of technologically important materials associated with advanced synthesis techniques. Examples range from small, exotic single crystals grown using hydrothermal growth techniques to additively manufactured components having complex geometries.

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Section: Methodsmentioning

confidence: 99%

Local measurement of bulk thermal diffusivity using photothermal radiometry

Hua

Schley

Hurley

2022

Review of Scientific Instruments

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“…Bisson and Fournier 11,12 and Paoloni and Fournier 13,14 reported the effect of diffraction on the thermal diffusivity measurement with PTR microscopy. Up to now, little attention has been paid to the vignetting effect of the IR collection systems used in PTR and PCR experiments.…”

Section: Introductionmentioning

confidence: 99%

Influence of vignetting on signal analysis of photocarrier radiometry of semiconductor wafers

Shaughnessy

Mandelis

2005

Review of Scientific Instruments

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Articles you may be interested inPhotocarrier radiometry of ion-implanted and thermally annealed silicon wafers with multiple-wavelength excitationsThe influence of vignetting on the photocarrier radiometry ͑PCR͒ measurements of semiconductor wafers has been investigated both theoretically and experimentally by analyzing the vignetting effect on the PCR amplitude and on the frequency dependence of the PCR amplitude and phase. The vignetting effect significantly reduces the PCR amplitude and modifies the frequency dependencies that are widely used to extract simultaneously the electronic transport properties ͑that is, the carrier lifetime, the carrier diffusion coefficient, and the front and rear surface recombination velocities͒ of semiconductor wafers. When using the frequency dependence of the PCR signal to determine the transport properties, the effect of vignetting can be accounted for by an "effective detector size"-a reduced detector size determined by the actual detector size and the vignetting effect.

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