An intelligent fluidic dissolved oxygen sensor system by electromechanical actuation method

Author

Xinbo He

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

Microfluidics
Electrolysis
Microelectromechanical systems
Bubbles

Thesis Number

T 8904

Print OCLC #

77496260

Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

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