3-omega method for thermal properties of thin film multilayers

Acquaroli, Leandro N.

doi:10.48550/arxiv.1811.00571

Cited by 1 publication

(2 citation statements)

References 7 publications

(23 reference statements)

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“…From the literature, the steady-state harmonic temperature oscillations in the metal heater produce harmonic variations in the resistance of the metal line given by the following equation: 153

1

where β is the TCR of the metal heater, Δ T DC is the temperature change due to the RMS power dissipated by the 1D line heater, |Δ T AC | is the magnitude of the temperature oscillations due to the AC Joule heating component, and

is the phase delay between the temperature oscillations and the injected current i . The voltage across the 1D heater is the product of the heater resistance and the current injected into the heater: 153

The 3 ω component of the voltage arises from the product of the resistance change due to Joule heating at 2 ω and the input current oscillating at frequency ω . The amplitude of the third harmonic voltage is given by 153

where V 0 = i 0 R 0 and T 2ω is the complex AC temperature oscillation at 2ω.…”

Section: Techniques For Meauring the Isotropic Effective Thermal Tran...mentioning

confidence: 99%

“…The voltage across the 1D heater is the product of the heater resistance and the current injected into the heater: 153

where V 0 = i 0 R 0 and T 2ω is the complex AC temperature oscillation at 2ω. The average temperature of the line heater is given by 74

2

where l and b are the length and half-width of the line heater, respectively, v represents 1D Fourier space, and 1/ q = h which is the thermal penetration depth.…”

Section: Techniques For Meauring the Isotropic Effective Thermal Tran...mentioning

confidence: 99%

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Advanced thermal sensing techniques for characterizing the physical properties of skin

Madhvapathy

Arafa

Patel

et al. 2022

Applied Physics Reviews

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Measurements of the thermal properties of the skin can serve as the basis for a noninvasive, quantitative characterization of dermatological health and physiological status. Applications range from the detection of subtle spatiotemporal changes in skin temperature associated with thermoregulatory processes, to the evaluation of depth-dependent compositional properties and hydration levels, to the assessment of various features of microvascular/macrovascular blood flow. Examples of recent advances for performing such measurements include thin, skin-interfaced systems that enable continuous, real-time monitoring of the intrinsic thermal properties of the skin beyond its superficial layers, with a path to reliable, inexpensive instruments that offer potential for widespread use as diagnostic tools in clinical settings or in the home. This paper reviews the foundational aspects of the latest thermal sensing techniques with applicability to the skin, summarizes the various devices that exploit these concepts, and provides an overview of specific areas of application in the context of skin health. A concluding section presents an outlook on the challenges and prospects for research in this field.

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“…From the literature, the steady-state harmonic temperature oscillations in the metal heater produce harmonic variations in the resistance of the metal line given by the following equation: 153

1

where V 0 = i 0 R 0 and T 2ω is the complex AC temperature oscillation at 2ω.…”

Section: Techniques For Meauring the Isotropic Effective Thermal Tran...mentioning

confidence: 99%

“…The voltage across the 1D heater is the product of the heater resistance and the current injected into the heater: 153

where V 0 = i 0 R 0 and T 2ω is the complex AC temperature oscillation at 2ω. The average temperature of the line heater is given by 74

2

where l and b are the length and half-width of the line heater, respectively, v represents 1D Fourier space, and 1/ q = h which is the thermal penetration depth.…”

Section: Techniques For Meauring the Isotropic Effective Thermal Tran...mentioning

confidence: 99%