NDLI: An absolute charge sensor of fluid electrification measurements

Content Provider	IEEE Xplore Digital Library
Author	Morin II, A.J. Zahn, M. Melcher, J.R. Otten, D.M.
Copyright Year	1965
Abstract	A new instrument, the Absolute Charge Sensor (ACS), has been developed that measures the net charge density entrained in a fluid flow, independent of the fluid's electrical properties, velocity, and any electrification processes within the instrument. Through a shielded sampling probe, the ACS periodically transfers a small volume of charged fluid to an electrically isolated Faraday cage with no fluid exiting. The charge density is calculated from the known filling flow rate and either the current or voltage, respectively measured by low or high impedance electrometers connected to the electrically isolated Faraday cage. The ACS overcomes the ambiguity in current or voltage measurements of probes placed into the fluid flow where it is impossible to separate contributions from impacting charge in the flow from charge separated at the probe interface by the very charge generation and transport processes that are under study. The instrument is typically operated to measure charge densities as low as a few mu C/m/sup 3/ using a sampling flow rate of 0.18 cm/sup 3/ with a sampling period on the order of 1 min. A Couette charger apparatus that simulates flow electrification processes in transformers and fuel pumps has been used to test the ACS using transformer oil or gasoline. Result show good correlation between the ACS and continuous flow measurements.<>
Sponsorship	IEEE Waseda Univ Univ. Salford
Starting Page	181
Ending Page	199
Page Count	19
File Size	1730954
File Format	PDF
ISSN	00189367
Volume Number	26
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1991-04-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Current measurement Charge measurement Fluid flow measurement Instruments Density measurement Sampling methods Probes Electric variables measurement Fluid flow Voltage measurement
Content Type	Text
Resource Type	Article
Subject	Engineering Electrical and Electronic Engineering

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