Research Student Presentation
Dear All,
DEPARTMENT OF INSTRUMENTATION AND APPLIED PHYSICS
Research Student Presentation
NAME OF THE CANDIDATE : Mr. Rohit Mazumder
DEGREE : Ph. D
TITLE OF THE PRESENTATION : Fabrication of DC Electric Field Meter
SUPERVISOR : Prof. A. K. Mohanty
DATE & TIME : Wednesday, 28th November, 2018 @ 2.30 PM.
VENUE : Seminar Hall, Dept. of Instrumentation
and Applied Physics
ABSTRACT
Non-contact DC electric field meters or field mills have been used for many years to measure electrostatic field levels in various applications. Some examples include the measurement of field intensity under HVDC power lines, measurement of atmospheric electricity parameters, preventing ESD related damages to electronic devices etc.
The rotating covering field mill is a popular instrument to measure the fields in these kinds of applications. The working principle is based on a chopping mechanism by a grounded shutter which converts the incident field on the sensing surface into an output AC current which is detected by the relevant instrumentation electronics. The chopper is usually rotated by a motor or vibrated by appropriate actuators on top of the sensing plate. In recent years, microelectromechanical systems (MEMS)-based field mills have also been investigated and developed due to the development of micro-fabrication technology. These traditionally actuate the shutter using electrostatic means.
The limitations of the above traditional methods include the high-power consumption of the actuators, wear and tear of the motor connections when used continuously and the crosstalk noise which occurs in the case of the electrostatic actuators used in the MEMS based meters.
This talk describes the development of a simple version of the field mill based on a loudspeaker. The steady vibration of a plate on top of the speaker converts the incident field into an AC signal similar to the traditional field mill. The instrumentation electronics used is based on the super heterodyning technique used in AM receivers. The future scope of the work includes measurement of contact potential differences between two metals when their junction is brought close to the vibrating plate.
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ALL ARE WELCOME
CHAIRMAN
Date/Time
Date(s) - 28/11/2018
2:30 pm - 3:30 pm
Seminar Hall, Dept. of Instrumentation and Applied Physics
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