NDLI: Design and implementation of a self-calibrating, compact micro strip sensor for in-situ dielectric spectroscopy and data transmission

Content Provider	IEEE Xplore Digital Library
Author	Pandey, G. Kumar, R. Weber, R.J.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA (Pandey, G.; Kumar, R.; Weber, R.J.)
Abstract	A compact, on-board, self-calibrating, micro strip sensor is presented. The sensor can make accurate multi-frequency measurements of complex permittivity in real time and transmit this information wirelessly by using the same sensor as a micro strip patch antenna. Such multi-frequency measurements in a multi-phase mixture like soil are used to estimate the concentration of individual constituents like bulk-soil, water, and various nutrients in soil. The sensor architecture comprises of a programmable phase locked loop (PLL) which sweeps through the frequency band of 3-40 MHz. The signal generated by the PLL is allowed to reflect from the micro strip patch which is surrounded by the dielectric medium under test (such as soil or food). The amplitude and phase of incident and reflected signals are captured and impedance due to the surrounding dielectric mixture is calculated. This impedance value is used to estimate the dielectric constant by mapping the input impedance of the micro strip sensor to different surrounding dielectric constant values. The sensor has an inbuilt self-calibrating mechanism which makes it useful for remote, underground and hand held applications.
Starting Page	1
Ending Page	4
File Size	371043
Page Count	4
File Format	PDF
ISBN	9781467346429
ISSN	19300395
DOI	10.1109/ICSENS.2013.6688570
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-11-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Impedance Soil Impedance measurement Microstrip antennas Transmission line measurements Ports (Computers) Calibration
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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