Masters Theses
Abstract
"Dissolved oxygen sensors are extensively used in many fields of industrial processes, medical diagnoses, and environmental surveillance. However, several significant drawbacks of the sensor still exist, such as the baseline drift and sensitivity degradation over time, which requires periodic time-consuming calibration procedures and subsequently a high maintenance. A novel method has been demonstrated in this study to overcome these problems by improving the dissolved oxygen sensor performance. A simple sensor system, consisted of a fluidic structure and electrolysis electrodes, is used to manipulate the oxygen calibration environment within the fluidic channel. Electrolytically generated oxygen and hydrogen bubbles play two roles in this integrated fluidic sensor system. First, the oxygen (100 % oxygen) and hydrogen bubbles (0% oxygen) are utilized for a two-point in situ self-calibration procedure of a dissolved oxygen sensor in the system. Secondly, the generation and shrinkage of the bubbles provide the driving force for the sampling and dispensing of analyte solutions. A prototype microsystem including a fluidic structure and electrolysis electrodes was designed and produced by microfabrication technology. The controlled bubble microenvironment effectively manipulated the sensor responses and the fluidic motion. With the proposed novel electrolysis technology, dissolved oxygen sensors can be made smaller and cheaper with a simple structure for in situ self-calibration and sampling/dispensing procedures"--Abstract, page iii.
Advisor(s)
Kim, Chang-Soo
Committee Member(s)
Watkins, Steve Eugene, 1960-
Wu, Cheng-Hsiao
Department(s)
Electrical and Computer Engineering
Degree Name
M.S. in Electrical Engineering
Sponsor(s)
National Science Foundation (U.S.)
Research Center/Lab(s)
Intelligent Systems Center
Publisher
University of Missouri--Rolla
Publication Date
Fall 2005
Pagination
vii, 46 pages
Note about bibliography
Includes bibliographical references (pages 42-45).
Rights
© 2005 Xinbo He, All rights reserved.
Document Type
Thesis - Restricted Access
File Type
text
Language
English
Subject Headings
MicrofluidicsElectrolysisMicroelectromechanical systemsBubbles
Thesis Number
T 8904
Print OCLC #
77496260
Recommended Citation
He, Xinbo, "An intelligent fluidic dissolved oxygen sensor system by electromechanical actuation method" (2005). Masters Theses. 5855.
https://scholarsmine.mst.edu/masters_theses/5855
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