Comparison of lock-in correlation and a novel periodogram method for experimental multi-harmonic thermoelastic analysis

Molina-Viedma, Ángel J.; Felipe-Sesé, Luis; López‐Alba, Elías; Díaz, Francisco

doi:10.1016/j.ymssp.2021.108235

Cited by 4 publications

(1 citation statement)

References 39 publications

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“…The temperature modulation induced by the elastocaloric effect was detected using the lock-in thermography (LIT) technique. [32] The LIT method based on an infrared camera is an established contact-free technique for the measurement of thermal effects, including heat conduction, [33,34] thermoelectric/thermo-spin conversion phenomena, [35][36][37] and caloric effects, [38][39][40] with high temperature and spatial resolutions. During the LIT measurements, a sinusoidal strain with the amplitude Δε (or elongation Δl), offset ε 0 (>Δε), and frequency f (=1 Hz unless otherwise specified) was applied to the sample along the y-axis using a motor-driven tensile machine, which excites a periodic oscillation of the sample temperature with the same f due to the elastocaloric effect.…”

Section: Experimental Setup Of Lock-in Thermographymentioning

confidence: 99%

Elastocaloric Kirigami Temperature Modulator

Hirai

Iguchi

Miura

et al. 2022

Adv Funct Materials

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The elastocaloric effect, a temperature change induced by the external tensile or compressive strain, is of crucial interest for next-generation thermal management technologies because of its environmental friendliness and economic benefits. Toward applications of the elastocaloric effect, many efforts have been made to determine highly efficient elastocaloric materials. Here, another way of modulating the elastocaloric temperature change is reported by applying a process inspired by the Japanese art of paper-cutting, named kirigami. Simply, by stretching elastocaloric materials with kirigami structure, it is demonstrated that focused heat absorption and release can be generated simultaneously owing to nonuniform internal stress by cutting patterns. Owing to the ultrahigh stretchability of kirigami, the input stress required to generate the elastocaloric temperature change is dramatically reduced, resulting in an improvement in the local cooling/heating performance. The concept demonstrated here can be applied to any elastocaloric material and pave the way for constructing versatile solid-state heat pumps for flexible electronics.

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