An electrostatic discharge event localization system using electromagnetic interference strength (Thai)

Abstract

This article presents a methodology to determine the locations of electrostatic discharge (ESD) events. The location is calculated by using the signal strength of the radiated electromagnetic interference (EMI) from ESD events. When an ESD event occurs, EMI radiation directly related to ESD current is always generated. Two experi-ments were performed to prove our ESD event localization. In the first experiment, an EMI detector was used to determine the relation between the EMI amplitude and the distance from ESD events. In the second experiment, four EMI detectors were used to determine the locations of ESD events. From the experimental results, we found that the ampli tudes from the EMI detectors rary invehsely to the longer distance between the detectors and the locations of the events. Therefore, this relation can be used to estimate the distances between the EMI detectors and the ESD sources. Then, these distances were used to locate the position of the ESD sources by using the Trilateration technique. The minimum position error of the calculated ESD source positions was 1.44 cm. from the real locations in a 60cm×60cm test area.