2026-09-18T22:54:40Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/695312022-01-13T07:54:36Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Brian W. Anthony.
Holmes, Jacklyn (Jacklyn A.)
Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2012-03-01T15:23:03Z
2012-03-01T15:23:03Z
2011
2011
http://hdl.handle.net/1721.1/69531
775601381
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 75-77).
Interdigitated electrodes are currently being used as sensing components in microfluidic lab-on-a-chip devices. The Daktari Diagnostics system uses these electrodes to measure the change in impedance of a fluid in an assay chamber. In order to improve quality assurance, a new testing method was developed and validated to characterize the sources of potential defects in the electrodes. In the new test, the electrodes are used to measure the impedance when placed in solutions of different known conductivities. The data was used to estimate the linear relationship between the inverse of the measured impedance to the solution conductivities. The repeatability tests found an average slope of 1.438x10-5 cm/characteristic length with a standard deviation of 8.52x10 -8 cm/characteristic length. It was found that the number of defective fingers or bending the electrodes significantly changes the electrode performance with a 95% confidence interval.
by Jacklyn Holmes.
M.Eng.
77 p.
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
copyright. They may be viewed from this source for any purpose, but
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http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Robustness and repeatability of interdigitated electrodes on a substrate tested in an aqueous environment
Thesis
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Publication
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<Abstract>Interdigitated electrodes are currently being used as sensing components in microfluidic lab-on-a-chip devices. The Daktari Diagnostics system uses these electrodes to measure the change in impedance of a fluid in an assay chamber. In order to improve quality assurance, a new testing method was developed and validated to characterize the sources of potential defects in the electrodes. In the new test, the electrodes are used to measure the impedance when placed in solutions of different known conductivities. The data was used to estimate the linear relationship between the inverse of the measured impedance to the solution conductivities. The repeatability tests found an average slope of 1.438x10-5 cm/characteristic length with a standard deviation of 8.52x10 -8 cm/characteristic length. It was found that the number of defective fingers or bending the electrodes significantly changes the electrode performance with a 95% confidence interval.</Abstract>
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