论文标题
通过混合频率激发提高磁性纳米热计精度
Improving magnetic nanothermometry accuracy through mixing-frequency excitation
论文作者
论文摘要
在这项研究中，我们提出了一个磁性纳米颗粒松弛的温度模型和在混合频率激发场下的相测量方法，该方法可以提高磁性纳米热计的温度准确性。根据磁性纳米颗粒的基于Debye的磁化模型，混合频率处的相位用于以较高的频率解决弛豫阶段延迟到磁场。该方法可以改善磁反应信号的信噪比，并削弱由温度变化引起的检测线圈的相移。实验结果表明，该方法可以达到小于0.1K的静态温度测量误差，而动态温度测量误差小于0.2K。
In this study, we proposed a temperature model of magnetic nanoparticle relaxation and a phase measurement method under a mixing-frequency excitation field, which can improve the temperature accuracy of magnetic nanothermometry. According to the Debye-based magnetization model for magnetic nanoparticles, the phases at the mixing frequencies are used to solve the relaxation phase delay to the magnetic field with the higher frequency. The method could improve the signal-to-noise ratio of the magnetic response signal, and also weaken the phase shift of the detection coils caused by temperature changes. Experimental results show that the method can achieve static temperature measurement error less than 0.1K and dynamic temperature measurement error less than 0.2K.
