纳米磁粒子应用于非接触式温度测量的研究

借助纳米磁粒子,通过测量其在不同温度下一、三次谐波幅值,使用郎之万函数达到求解温度的目的。首先对郎之万函数进行Taylor展开,进行简单的化简,然后根据正弦磁场下一、三次谐波的求解方式,把郎之万函数代入其中,构建温度和一、三次谐波幅值的函数关系。在较弱磁场的作用下,进行了三组实验,分别在-5℃～0℃、-15℃～0℃以及-25℃～0℃上进行实验研究。通过与光纤温度计测试结果的对比,发现这种方法在-25℃～0℃这个温度区间内可以实现精确温度测量,其误差为0.02 K～0.2 K。

Research on application of magnetic nanoparticle to non-contact temperature measurement

In this paper, the nanometer magnetic particles were used to measure the temperature of the next and third harmonics at different temperatures, and the Langevin function was used to solve the temperature. Firstly, Taylor expansion was performed on the Langevin function, and simple simplification was performed. Then, according to the way of solving the next and third harmonics of the sinusoidal magnetic field, the Langevin function was substituted into it to construct the function of temperature and first and third harmonic amplitude relationship. Under the action of weak magnetic field, three experiments were carried out in this paper, and the experimental research was carried out at -5 ℃~ 0 ℃,-15 ℃~ 0 ℃ and -25 ℃~ 0 ℃. By comparing with the test results of the fiber optic thermometer, it is found that this method can achieve accurate temperature measurement in the temperature range of-25 ° C ~ 0 ° C, the error is 0.02 K ~ 0.2 K.