基于电荷感应法浮游金属粉尘质量浓度检测技术

抛光打磨作业场所浮游金属粉尘具有爆炸性,实现对其质量浓度实时监测具有重要意义。本文在分析了浮游金属粉尘带电机理和电荷感应法粉尘质量浓度检测原理的基础上,针对棒状和环状探测电极存在的问题,设计了一种螺旋环状探测电极。通过建立螺旋环状探测电极的空间灵敏度,证明了螺旋环状探测电极感应信号强度高,并为螺旋环状探测电极的匝数、半径、绝缘层厚度等具体参数的设计提供了参考依据;此外对通过螺旋环状探测电极的结构设计分析,证明了螺旋环状探测电极与外界具有较高的绝缘性,确认螺旋环状探测电极是基于电荷感应法理想的探测电极。最后实验证明:采用螺旋环状探测电极的电荷感应法浮游金属粉尘质量浓度传感器检测误差低于10%,具有较高的检测精度。

Detection Technology of Dust Mass Concentration of Floating Metal Based on Charge Sensing Method

The floating metal dust in the polishing workplace is explosive and the real-time monitoring of its mass concentration is of great significance to prevent the occurrence of accidents. Based on the analysis of the electrification mechanism of floating metal dust and the detection principle of dust mass concentration by charge induction method, a spiral ring detection electrode was designed to solve the problems existing in the rod and ring detection electrodes. By establishing the spatial sensitivity of the helical annular probe electrode and carrying out correlation analysis, it is proved that the helical annular probe electrode has high inductance signal strength, which provides a reference for the design of its parameters such as the number of turns, radius, thickness of the insulating layer, etc. In addition, it is proved that the helical annular probe electrode has a high insulation with the outside world by analyzing its structure, finding that it is the ideal probe electrode based on charge sensing method. Finally, the experiments prove that the detection error is less than 10% by using the floating metal dust mass concentration sensor of charge sensing method with the helical annular probe electrode and it has a higher detection accuracy.