Feasibility of Novel Rear-Side Mirage Deflection Method for Thermal Conductivity Measurements

Sensors

Hyunjung Kim¹  Gwantaek Kim¹  Moojoong Kim² 

[1] Department of Mechanical Engineering, Ajou University, Suwon 16499, Korea;SAITO LAB, Waseda Research Institute for Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan;

关键词: photothermal effect;    phase delay;    rear-side mirage method;    light absorption thin film;    thermal conductivity;    thermal properties;   

DOI  :  10.3390/s21175971

来源: DOAJ

【 摘 要 】

Among the noncontact measurement technologies used to acquire thermal property information, those that use the photothermal effect are attracting attention. However, it is difficult to perform measurements for new materials with different optical and thermal properties, owing to limitations of existing thermal conductivity measurement methods using the photothermal effect. To address this problem, this study aimed to develop a rear-side mirage deflection method capable of measuring thermal conductivity regardless of the material characteristics based on the photothermal effect. A thin copper film (of 20 µm thickness) was formed on the surfaces of the target materials so that measurements could not be affected by the characteristics of the target materials. In addition, phase delay signals were acquired from the rear sides of the target materials to exclude the influence of the pump beam, which is a problem in existing thermal conductivity measurement methods that use the photothermal effect. To verify the feasibility of the proposed measurement technique, thermal conductivity was measured for copper, aluminum, and stainless steel samples with a 250 µm thickness. The results were compared with literature values and showed good agreement with relative errors equal to or less than 0.2%.

【 授权许可】

Unknown