摘要
介绍了静电传感器空间率波的基本原理,分析了静电传感器空间率波特性,在此基础上推导了传感器的频率响应特性.并在重力输送颗粒流装置上对静电传感器测量系统的动态特性进行了实验研究.理论和试验结果表明:静电传感器在空间频域上充当低通滤波器,而且径向位置越小,空间频带越窄;电极轴向长度越小,空间频带越宽;在时间频域内测量系统相当于带通滤波器,电极的轴向长度和颗粒径向位置对频带宽度的影响与空域频率特性相似;此外,颗粒速度越大,时域频带越宽,颗粒尺寸越大,频带越窄.
The spatial filtering fundamental theory of electrodynamic sensor is introduced and its spatial filtering property is also analyzed quantitatively in the paper. Further, the temporal frequency response characteristics of electrodynamic sensor are derived and the experimental test results on a gravity-fed conveyor are presented. Theoretical and experimental results obtained demonstrate that electrodynamic sensor acts as a low-pass filter in the spatial frequency domain and the spatial frequency bandwidth broadens with the increase of radial coordinate and the decrease of the axial length of the electrode. The measurement system including electrodynamic sensor and its signal electronics acts as a band pass filter in the temporal frequency domain. The effects of radial position and the axial length of the electrode on the temporal frequency bandwidth are similar to the spatial frequency domain. In addition higher particle velocity and smaller particle size result in a wider temporal frequency bandwidth.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第4期556-561,共6页
Journal of Southeast University：Natural Science Edition
基金
国家重点基础研究专项经费资助项目(2004CB17702-04)
国家自然科学基金资助项目(50576010)
教育部博士点基金资助项目(20040286038)
关键词
频率响应
空间滤波效应
静电传感器
气固两相流
颗粒静电化
frequency response characteristics
spatial filtering effect
electrodynamic sensor
gassolid two-phase flows
particle electrification
