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A microcontroller-based Electrochemical Impedance Spectroscopy Platform for Health Monitoring Systems

Bhatnagar, Purva
http://orcid.org/0000-0001-6118-7276
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439307617

Abstract Details

2015, MS, University of Cincinnati, Engineering and Applied Science: Electrical Engineering.
Electrochemical Impedance Spectroscopy (EIS) is an experimental procedure and important technique to evaluate the underlying characteristics of biosensors, body fluids, electrochemical fuel cells, and electronic circuits. Existing EIS systems are expensive, bulky, and difficult to integrate with other systems such as wearable medical devices. This thesis presents a prototype of a low-cost, portable, microcontroller-based EIS platform for integration with health monitoring systems. A major challenge is to eliminate the use of sophisticated and expensive hardware and provide an alternative low-cost solution that can maintain the ability of measuring over an acceptable range of frequencies and impedance values. The prototype of the portable EIS system is developed using an off-the-shelf, fast and, powerful digital signal controller that serves as the main control unit of the system. The in-built modules like Pulse Width Modulation, Analog-to-Digital Converter, Direct Memory Access and Universal Asynchronous Receiver Transmitter along with low pass-filters are used for signal generation, sampling as well as signal processing. The system also employs a low-cost and effective analog interface module for conditioning digital signals generated from the controller, which are as analog inputs in electrical cell impedance models as well as commercial electrochemical cell in the form of interdigitated electrodes with Phosphate Buffer Saline(PBS) and vice versa. With an operating sampling frequency in the range of 2 Hz – 2 KHz, the overall cost of the system is estimated to be less than $100. The overall efficiency of the system is fair for complex impedance amplitude and phase computation with error in computation calculated to be less than 10%. These results demonstrate the feasibility of a portable EIS system for electrochemical as well as bioelectrical impedance analysis.
Fred Beyette, Ph.D. (Committee Chair)
Jason Heikenfeld, Ph.D. (Committee Member)
Carla Purdy, Ph.D. (Committee Member)
108 p.
Electrical Engineering
Portable Electrochemical Impedance Spectroscopy; Health Monitoring Systems; Digital Signal Controller; Pulse Width Modulation Signal Generator; Phase Detection of Impedance; Analog Interface Circuit

Recommended Citations

Citations

  • Bhatnagar, P. (2015). A microcontroller-based Electrochemical Impedance Spectroscopy Platform for Health Monitoring Systems [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439307617

    APA Style (7th edition)

  • Bhatnagar, Purva. A microcontroller-based Electrochemical Impedance Spectroscopy Platform for Health Monitoring Systems. 2015. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439307617.

    MLA Style (8th edition)

  • Bhatnagar, Purva. "A microcontroller-based Electrochemical Impedance Spectroscopy Platform for Health Monitoring Systems." Master's thesis, University of Cincinnati, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439307617

    Chicago Manual of Style (17th edition)

ucin1439307617
3,807
© 2015, some rights reserved.Creative Commons License A microcontroller-based Electrochemical Impedance Spectroscopy Platform for Health Monitoring Systems by Purva Bhatnagar is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.