Guba Sándor, Horváth Barnabás, Szalai István
Research Centre for Engineering Sciences, Functional Soft Materials Research Group, University of Pannonia, 10 Egyetem St, H-8200 Veszprém, Hungary.
Institute of Mechatronics Engineering and Research, University of Pannonia, 18/A Gasparich Márk St, H-8900 Zalaegerszeg, Hungary.
Heliyon. 2022 Jun 1;8(6):e09606. doi: 10.1016/j.heliyon.2022.e09606. eCollection 2022 Jun.
One of the simplest way to characterize the heating efficiency of magnetic fluids used in hyperthermia treatment is the calorimetric measurement of the specific loss power with direct temperature detection. However, the performance of metallic sensors in an alternating magnetic field is degraded by the self-heating of the probes, and electromagnetic interference can be also significant. In our double cell differential thermometric system these disturbing effects can be compensated. Specific loss power measurements of EMG700 magnetic fluid with negative temperature coefficient thermistors in differential configuration are presented, and control measurements were performed with an optical fiber thermometer in frequency and magnetic field strength range. We found that the specific loss power is proportional to the frequency and shows a quadratic dependence on the field strength in the low field strength region, therefore we calculated the intrinsic loss power of the fluid from the measured specific loss power. At this field conditions intrinsic loss power up to was determined.
表征用于热疗的磁流体加热效率的最简单方法之一是通过直接温度检测对比热功率进行量热测量。然而，交变磁场中金属传感器的性能会因探头的自热而降低，电磁干扰也可能很显著。在我们的双池差示测温系统中，这些干扰效应可以得到补偿。本文介绍了采用负温度系数热敏电阻以差分配置对EMG700磁流体的比损耗功率进行测量，并在频率和磁场强度范围内使用光纤温度计进行了对照测量。我们发现比损耗功率与频率成正比，并且在低场强区域对比场强呈二次依赖性，因此我们从测量的比损耗功率中计算出了流体的固有损耗功率。在这种场条件下，确定了高达 的固有损耗功率。
