NDLI: A Novel Real-Time Capacitance Estimation Methodology for Battery-Less Wireless Sensor Systems

Content Provider	IEEE Xplore Digital Library
Author	Hwa Soo Kim Sivaramakrishnan, S. Sezen, A.S. Rajamani, R.
Copyright Year	2001
Abstract	This paper presents a novel method to read a passive capacitive sensor in telemetry by using inductive coupling. While classical inductive coupling approaches measure sensor capacitance by identifying the resonant frequency of the sensor with a sweep of radio frequency (RF) signals, the proposed method estimates the capacitance change in real-time by algebraically manipulating two measurements (the magnitude and the phase of the reflected sensor impedance). Only one RF signal is used in the proposed method instead of a frequency sweep. Analysis is provided to show that some physical parameter errors can deteriorate the capability of the proposed method in accurately measuring sensor capacitance. However, the use of a first order calibration procedure based on error analysis overcomes this shortcoming. Extensive experimental results with the proposed method combined with a first order calibration show that multifrequency and rapid changes in sensor capacitance can be estimated reliably under varying locations and orientations of the interrogator. The battery-less wireless sensors enabled by the developed technology in this paper can be widely used for measurement of fluid pressure, force, acceleration and other capacitance-change based sensor measurements.
Sponsorship	IEEE Sensors Council
Starting Page	1647
Ending Page	1657
Page Count	11
File Size	2204920
File Format	PDF
ISSN	1530437X
Volume Number	10
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Real time systems Wireless sensor networks Sensor systems Capacitive sensors Capacitance measurement Force measurement Impedance measurement Frequency measurement Phase measurement Radio frequency mutual inductance Battery-less wireless sensor capacitance sensing inductive coupling
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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