International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2568

Full Length Research Paper

Sensing and filtering characteristics of electrostatic sensors for pneumatically conveyed particles

M. F. Rahmat1, I. T. Thuku1, T. Tajdari1, K. Jusoff2* and M. R. Ghazali3  
1Department of Control and Instrumentation Engineering, Faculty of Electrical Engineering, UniversitiTeknologi Malaysia, 81310 Skudai Johor, Malaysia. 2Faculty of Forestry, Universiti Putra Malaysia, 43400 Serdang, Selangor. Malaysia. 3Faculty of Electrical and Electronic Engineering, Universiti Malaysia Pahang, KampusPekan, 26600 Pekan Pahang, Malaysia.
Email: [email protected]

  •  Accepted: 20 July 2011
  •  Published: 02 October 2011


Electrostatic sensor, which can also be called as triboelectric sensor or electrodynamic sensor, senses the electrostatic charge carried by the dry particle in pneumatic conveyor. Source of the signal induced on the electrostatic sensor is brought by the object to be measured and no excitation circuit is necessary. Electrostatic sensors are used in the process industry due their low cost and robust. This paper describes an investigation into characteristics of circular and rectangular plate shapes of electrostatic sensors. Two parameters were investigated, the effect of sensor area on sensitivity and the spatial filtering effect of the sensor due to its finite size. Models were proposed and results obtained and used to compare with experimental values. It was observed that relationships existed between sensor sensitivity, sensor area and sensor spatial filtering effect.


Key words: Electrostatic sensor, sensitivity, spatial filtering, electrodynamic sensor.