The magnetization curve of the ferrofluid EMG909 is measured. It can adequately be described by a superposition of four Langevin terms. The effective dipole strength of the magnetic particles in this fluid is subsequently obtained by a graphical rectification of the magnetization curve based on the inverse Langevin function. The method yields the arithmetic and the harmonic mean of the magnetic moment distribution function, and a guess for the geometric mean and the relative standard deviation. It has the advantage that it does not require a prejudiced guess of the distribution function of the poly-disperse suspension of magnetic particles.

中文翻译：

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EMG909 的图形磁粒度测量

测量铁磁流体 EMG909 的磁化曲线。它可以通过四个朗之万项的叠加来充分描述。该流体中磁性粒子的有效偶极强度随后通过基于逆朗之万函数的磁化曲线的图形校正获得。该方法产生磁矩分布函数的算术平均值和调和平均值，以及对几何平均值和相对标准偏差的猜测。它的优点是不需要对磁性粒子的多分散悬浮液的分布函数进行有偏见的猜测。