A potentiostat based on a voltage-controlled current source for use with amperometric gas sensors

Author

Fidler, John C. ; Penrose, William R. ; Bobis, James P.

Author_Institution

Dept. of Electr. Eng., Northern Illinois Univ., DeKalb, IL, USA

Volume

41

Issue

2

fYear

1992

fDate

4/1/1992 12:00:00 AM

Firstpage

308

Lastpage

310

Abstract

Amperometric gas-sensing devices develop a current that is proportional to the concentration of gas that is supplied to them. The circuit that maintains electrochemical stability in the sensor as well as buffering the current output is called a potentiostat. Some sensors used for gas sensing have very large electrode capacitances, which can result in instability with conventional potentiostat designs. The responses of two potentiostat designs to a gas were compared. One is based on conventional use of a current-to-voltage converter (CVC); the second is a new design which uses a voltage-controlled current source (VCCS). A frequency analysis of the VCCS potentiostat design is included

Keywords

convertors; electric sensing devices; electrochemical analysis; frequency-domain analysis; gas sensors; amperometric gas sensors; current-to-voltage converter; electrochemical stability; frequency analysis; microprocessor; pollution control; potentiostat; voltage-controlled current source; Capacitance; Capacitive sensors; Counting circuits; Current measurement; Electrodes; Frequency; Gas detectors; Immune system; Transducers; Voltage control;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.137366

Filename

137366