Near-infrared measurement of axisymmetric temperature field formed by free convection from a 1-mm-diameter heating sphere in water

Kakuta, Naoto; Arakawa, Yuki; Kyoda, Mizuki; Miyake, Takahito; Mishiba, Kazu; Kondo, Katsuya

doi:10.1016/j.ijheatmasstransfer.2019.03.127

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…Kakuta et al [20,21] have investigated the temperature dependence of the absorption in waterethanol mixtures in the near-IR and used the thermal dependence of the absorption to study convection phenomena [22,23] and temperature fields [24] in aqueous solutions. Yu et al [25,26], on the other hand, have studied the absorption spectrum of fused silica fiber optics in the near infrared (1000 -2500 nm) as a function of temperature, focusing on the hydroxyl groups.…”

Section: Main Textmentioning

confidence: 99%

Mid-infrared spectroscopic thermotransmittance measurements in dielectric materials for thermal imaging

Bourges,

Chevalier,

Maire

et al. 2024

Applied Physics Letters

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Thermal considerations affect the performance of most microsystems. Although surface techniques can give information on the thermal properties within the material or about buried heat sources and defects, mapping temperature and thermal properties in three dimension (3D) is critical and has not been addressed yet. Infrared thermography, commonly used for opaque materials, is not adapted to semi-transparent samples such as microfluidic chips or semiconductor materials in the infrared range. This work aims at answering these needs by using the variations of transmittance with temperature to obtain information on the temperature within the thickness of the sample. We use a tunable mid-infrared light source combined with an infrared camera to measure these variations of transmittance in a glass wafer. We couple this technique with a thermal model to extract the thermotransmittance coefficient—the coefficient of temperature variation of the transmittance. We then introduce a semiempirical model based on Lorentz oscillators to estimate the temperature-dependent optical properties of our sample in the mid-IR spectral range. Combined with the measurement, this paper reports the spectroscopic behavior of the thermotransmittance coefficient in the mid-IR range and a way to predict it.

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Section: Main Textmentioning

confidence: 99%

Mid-infrared spectroscopic thermotransmittance measurements in dielectric materials for thermal imaging

Bourges,

Chevalier,

Maire

et al. 2024

Applied Physics Letters

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“…1 shows the spectra of ΔA, which indicates that ΔA at λ = 1150 nm is the most in the band. This wavelength can be used for the temperature measurement of water (Kakuta et al 2017(Kakuta et al , 2019Han and Kakuta 2020), and was thus used to obtain the ΔA images in this study.…”

Section: Nir Absorption Spectrum Of Watermentioning

confidence: 99%

“…To avoid the singularity when solving Eq. 6, we applied a multi-Gaussian approximation to ΔA, which was suitable for monotonically decreasing data as in this case (Kakuta et al 2019).…”

Section: Non-axisymmetric Inverse Abel Transformmentioning

confidence: 99%

“…Finally, since there is a proportional relationship between ΔT and Δμ at 1150 nm (Kakuta et al 2017(Kakuta et al , 2019Nguyen et al 2022), ΔT(x, y) can be obtained by…”

Section: Non-axisymmetric Inverse Abel Transformmentioning

confidence: 99%

“…The particles are not used for the temperature measurement. The temperature is determined based on the temperature dependence of the absorption band of water in the NIR region (Kakuta et al 2014(Kakuta et al , 2019. In our previous study (Nguyen et al 2022), we achieved the 3D imaging of a thermal plume rising from a 1-mm-diameter heat source in water by applying a non-axisymmetric inverse Abel transform to the 2D absorbance images of the two directions.…”

Section: Introductionmentioning

confidence: 99%

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Near-infrared simultaneous measurement of temperature and flow fields of a thermal plume arising in water

Nguyen

Kondo

Hanada

et al. 2023

Preprint

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This study presents a method for the simultaneous measurement of three-dimensional (3D) temperature and flow fields in water where a thermal plume arises from a small heat source. This method is based on the near-infrared (NIR) absorption imaging with a two-orthogonal-direction telecentric system at a wavelength of 1150 nm. The acquired images of each direction were separated into the absorbance images corresponding to the temperature field and the particle shadow images through a background subtraction method. To the absorbance images of the two directions, a non-axisymmetric inverse Abel transform was applied in order to reconstruct the 3D temperature fields. The temperature was determined using the temperature dependence of the absorption coefficient of water at the wavelength. The 3D flow fields were obtained by applying the particle shadow tracking velocimetry (PSTV) that consisted of particle identification, track interpolation, and particle 3D matching to the particle shadow images. The results demonstrated the 3D transient temperature profiles within the plume and the effect of forced flow on its growth direction. At the same time, the PSTV indicated that the trajectories were consistent with the mixed convection field, which was verified by numerical simulation.

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Simultaneous near-infrared measurement of temperature and flow fields of a thermal plume arising in water

Nguyen,

Kondo,

Kakuta

2024

J Vis

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Near-infrared measurement of axisymmetric temperature field formed by free convection from a 1-mm-diameter heating sphere in water

Cited by 8 publications

References 33 publications

Mid-infrared spectroscopic thermotransmittance measurements in dielectric materials for thermal imaging

Mid-infrared spectroscopic thermotransmittance measurements in dielectric materials for thermal imaging

Near-infrared simultaneous measurement of temperature and flow fields of a thermal plume arising in water

Simultaneous near-infrared measurement of temperature and flow fields of a thermal plume arising in water

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