Masters Theses


Xinbo He


"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.


Kim, Chang-Soo

Committee Member(s)

Watkins, Steve Eugene, 1960-
Wu, Cheng-Hsiao


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


National Science Foundation (U.S.)

Research Center/Lab(s)

Intelligent Systems Center


University of Missouri--Rolla

Publication Date

Fall 2005


vii, 46 pages

Note about bibliography

Includes bibliographical references (pages 42-45).


© 2005 Xinbo He, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings

Microelectromechanical systems

Thesis Number

T 8904

Print OCLC #


Link to Catalog Record

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