Kakuta Naoto, Nishijima Keisuke, Han Van Cuong, Arakawa Yuki, Kondo Katsuya, Yamada Yukio
Department of Mechanical Engineering, Tokyo Metropolitan University;
Department of Mechanical Engineering, Tokyo Metropolitan University.
J Vis Exp. 2018 Apr 30(134):57407. doi: 10.3791/57407.
A technique to measure the temperature of water and non-turbid aqueous media surrounding an induction-heated small magnetic sphere is presented. This technique utilizes wavelengths of 1150 and 1412 nm, at which the absorption coefficient of water is dependent on temperature. Water or a non-turbid aqueous gel containing a 2.0-mm- or 0.5-mm-diameter magnetic sphere is irradiated with 1150 nm or 1412 nm incident light, as selected using a narrow bandpass filter; additionally, two-dimensional absorbance images, which are the transverse projections of the absorption coefficient, are acquired via a near-infrared camera. When the three-dimensional distributions of temperature can be assumed to be spherically symmetric, they are estimated by applying inverse Abel transforms to the absorbance profiles. The temperatures were observed to consistently change according to time and the induction heating power.
本文提出了一种测量感应加热小磁球周围水和非浑浊水性介质温度的技术。该技术利用1150和1412nm的波长，此时水的吸收系数取决于温度。使用窄带通滤波器选择1150nm或1412nm的入射光照射含有直径为2.0mm或0.5mm磁球的水或非浑浊水性凝胶；此外，通过近红外相机获取作为吸收系数横向投影的二维吸光度图像。当温度的三维分布可假定为球对称时，通过对吸光度分布应用逆阿贝尔变换来估计温度。观察到温度随时间和感应加热功率持续变化。
