Measurement of In-Plane Thermal Diffusivity of Polymer Films in Air Using Laser Periodic Heating Method

IF 2.5 4区工程技术 Q3 CHEMISTRY, PHYSICAL

International Journal of Thermophysics Pub Date : 2025-01-09 DOI:10.1007/s10765-024-03491-4

Maochao Lv, Jie Yang, Yanhui Zhang, Jianli Wang, Yi Zhou

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Abstract

The laser periodic heating method is widely used to measure the thermal diffusivity of various thin films. In this technique, surface temperature responses are monitored using either an infrared (IR) camera or a thermocouple (TC) detector. Under air pressure, the impact of air heat loss on these two measurement methods warrants further examination. In this study, we measured the in-plane thermal diffusivity of a polyethylene terephthalate (PET) film under air pressure using both a non-research-grade IR camera and a microscale TC. Results indicate that air heat loss significantly influenced the TC measurements, yielding an abnormally high thermal diffusivity. Comparatively, the thermal diffusivity measured by the IR camera decreased slightly as modulation frequency increased from 0.1 Hz to 1 Hz. When the thermal diffusion length was approximately three times the film thickness, the diffusivity values from the IR camera closely matched those obtained under vacuum, indicating that the non-contact IR method can effectively suppress the impact of air heat loss.

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激光周期加热法测量空气中聚合物薄膜的面内热扩散系数

激光周期加热法被广泛用于测量各种薄膜的热扩散系数。在这种技术中，使用红外（IR）摄像机或热电偶（TC）探测器监测表面温度响应。在空气压力下，空气热损失对这两种测量方法的影响值得进一步研究。在这项研究中，我们使用非研究级红外相机和微型TC测量了空气压力下聚对苯二甲酸乙二醇酯（PET）薄膜的面内热扩散率。结果表明，空气热损失显著影响TC测量，产生异常高的热扩散系数。相比之下，当调制频率从0.1 Hz增加到1 Hz时，红外相机测量的热扩散率略有下降。当热扩散长度约为膜厚的3倍时，红外相机得到的扩散系数值与真空条件下的扩散系数值非常接近，表明非接触式红外方法可以有效地抑制空气热损失的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermophysics 物理-力学

CiteScore

4.10

自引率

9.10%

发文量

179

审稿时长

5 months

期刊介绍： International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.