Investigations into sensing characteristics of circular thin-plate electrostatic sensors for gas path monitoring

Electrostatic sensors – Their principles and applications

“…In addition, the signal induced by fast-moving and continuous particles has a broader frequency bandwidth and more high frequency contents. As the rod-shaped electrode is restrictive to the gas flow, Chen et al [102]- [104] proposed circular thin-plate and hemisphere-shape electrodes. The performance of these sensors was evaluated through mathematical modelling and simple validation experiments.…”

A Comparative Study of the Preamplifiers in Electrostatic Sensors Through Analytical Modeling and Experimental Evaluation

“…Finally, the diversity of available preamplifiers has caused some misuses of the terms in the literature. For instance, Murnane et al [18], Chen et al [19] and Zhang et al [20] termed the conditioning circuits that convert the induced current into voltage signals as charge amplifiers by mistake. It is hopeful that misconceptions and misuses of the preamplifiers could be corrected via this comparative study.…”

“…The motion of a charged object gives rise to redistribution of electrons in the electrode, therefore most studies on modelling of electrostatic sensors have focused on calculation of the induced charge by means of mathematical modelling [12,18,19] or finite element simulation [11,21]. The amount of induced charge is dependent on the location of the charged object relative to the electrode.…”

A review of electrostatic monitoring technology: The state of the art and future research directions

“…The sensitivity of the sensor and the size and shape of the space within which it is located affect the ideal sensor shape. Taking the electrostatic sensor for the gas path condition monitoring as an example, the ring shape is clearly appropriate for the detection of the ingested debris in the inlet [4], with its fixed position and shape, while various shapes, such as button [14,15], plate [60,61], cylindrical probe [4,26,58], and hemisphere [62,63], have all been proposed for monitoring the exhaust debris in the exhaust pipe. For example, [61] used a flat sensing plate-shaped sensor in the exhaust cone; whereas for other applications, a button sensor, where the probe of the electrostatic sensor has a button-shaped surface and is mounted flush in the exhaust duct or jet pipe of the engine, may be easier to install.…”