Vol. 120, Issue 9, September 2010, pp.162-170

Design and Development of Embedded Based System for the Measurement of Dielectric Constant Spectroscopy for Liquids

V. V. Ramana C. H., ¹Narsinga Rao S., ¹Ashok Kumar M., ²Jayaramudu J., Kathalingam A., Sudhakar S., Mi-Ra Kim, Yeon-Sik Chae and Jin-Koo Rhee

MINT Research Center, Dongguk University,

Seoul – 100 175, South Korea

¹Department of Instrumentation, Sri Krishnadevaraya University,

Anantapur – 515 055, Andhra Pradesh, India

²Department of Polymer Science & Technology, Sri Krishnadevaraya University,

Anantapur – 515 055, Andhra Pradesh, India

E-mail: jkrhee@dongguk.edu

Received: 26 June 2010   /Accepted: 14 September 2010   /Published: 27 September 2010

Abstract: An embedded based system for the measurement of dielectric constant spectroscopy (for frequencies 1 kHz, 10 kHz, 100 kHz, 1 MHz and 10 MHz) for liquids has been designed and developed. It is based on the principle that the change in frequency of an MAX 038 function generator, when the liquid forms the dielectric medium of the dielectric cell, is measured with a microcontroller. Atmel’s AT89LP6440 microcontroller is used in the present study. Further, an LCD module is interfaced with the microcontroller in 4-bit mode, which reduces the hardware complexity. Software is developed in C using Keil’s C-cross compiler. The instrument system covers a wide range of dielectric constants for various liquids at various frequencies and at different temperatures. The system is quite successful in the measurement of dielectric constant in liquids with an accuracy of ± 0.01 %. The dielectric constant is very dependent on the frequency of their measurement. No one-measurement technique is available, however, that will give the frequency range needed to characterize the liquid sample. The paper deals with the hardware and software details.

Keywords: Dielectric constant spectroscopy, MAX 038 Function generator, Frequency measurement, C using Keil’s C-cross compiler and AT89LP6440 microcontroller.

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