论文标题
计算薄导电物体引起的热磁噪声的一般方法
A general method for computing thermal magnetic noise arising from thin conducting objects
论文作者
论文摘要
电导物体中电荷载体的热运动会导致磁场噪声干扰导体附近的敏感测量。在本文中，我们描述了一种从任意形状的薄导电物体中计算热磁噪声的光谱特性的方法。我们使用流函数在导电表面上对无差异电流进行建模，并计算准静态策略中的磁性噪声电流模式。我们获得了热磁噪声的功率光谱密度及其空间相关性和频率依赖性。我们描述了该方法的数值实现；我们使用三角形网格对导电表面进行建模并离散流函数。数值磁噪声计算与分析公式一致。我们将实现作为免费和开源软件包BfieldTools的一部分。
Thermal motion of charge carriers in a conducting object causes magnetic field noise that interferes with sensitive measurements nearby the conductor. In this paper, we describe a method to compute the spectral properties of the thermal magnetic noise from arbitrarily-shaped thin conducting objects. We model divergence-free currents on a conducting surface using a stream function and calculate the magnetically independent noise-current modes in the quasi-static regime. We obtain the power spectral density of the thermal magnetic noise as well as its spatial correlations and frequency dependence. We describe a numerical implementation of the method; we model the conducting surface using a triangle mesh and discretize the stream function. The numerical magnetic noise computation agrees with analytical formulas. We provide the implementation as a part of the free and open-source software package bfieldtools.
