Sensing characteristics of electrostatic inductive sensor for flow parameters measurement of pneumatically conveyed particles
Sensing characteristics of electrostatic inductive sensor for flow parameters measurement of pneumatically conveyed particles
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DOI：
10.1016/j.elstat.2007.01.001
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发表时间：
2007-08-01
影响因子：
1.8
通讯作者：
Zhou, Bin
中科院分区：
文献类型：
--
作者：
Xu, Chuanlong;Wang, Shimin;Zhou, Bin
环形静电感应传感器的空间灵敏度、空间滤波效果、时间频率响应特性和带宽是影响传感器精度和响应速度的重要参数。本文建立了具有单位电荷的单个粒子在不同几何尺寸的环形传感器上感应电荷的数学模型。从数值解来看。利用有限元分析软件ANSYS得到了传感器的空间灵敏度。研究了传感器几何尺寸对空间灵敏度的影响，定量分析了空间滤波的基本原理和空间滤波效果。推导了传感器的时域频率响应特性。给出了在重力输送机上的试验结果。理论和实验结果表明，环形传感器在空间频率域中起低通滤波器的作用，其空间频率特性与带电粒子的径向位置和电极的轴向长度密切相关。测量系统，包括探头和信号调理电路，起着带通滤波器的作用，电极的径向位置、轴向长度、颗粒速度和颗粒尺寸对测量系统的时频特性有重要影响。(C)2007 Elsevier B.V.保留所有权利。
The spatial sensitivity, spatial filtering effect, temporal frequency response characteristics and bandwidth are important parameters influencing the accuracy and response speed of a ring-shaped electrostatic inductive sensor. In this paper, the charge induced on the ring-shaped sensor with different geometric sizes from a single particle having a unity charge was modeled mathematically. And from the numerical solution. obtained using the finite element analysis software ANSYS, the spatial sensitivity of the sensor was derived. The effect of the geometric size of the sensor on the spatial sensitivity was also investigated, and its spatial filtering fundamental theory and spatial filtering effect were also analyzed quantitatively. The temporal frequency response characteristics of the sensor were also derived. The experimental results on a gravity-fed conveyor were presented. The theoretical and experimental results obtained demonstrate that the ring-shaped sensor acts as a low-pass filter in the spatial frequency domain and its spatial frequency characteristics are closely related to the radial position of the charged particle and the axial length of the electrode. The measurement system, including the probe and signal conditioning circuit, acts as a band-pass filter, and the radial position, the axial length of the electrode, particle velocity and particle size have important effects on the temporal frequency characteristics of the measurement system. (C) 2007 Elsevier B.V. All rights reserved.