Title :
Mathematical model and design optimization of recessed dissolved oxygen cathode array
Author :
Yuquan Chen ; Guang Li ; Weixue Lu ; Ko, W.H.
Author_Institution :
Dept. of Sci., Instrum., Zhejiang Univ., Hangzhou, China
Abstract :
A mathematical model of recessed dissolved oxygen cathode array sensors is described. Three-dimensional cylindrical coordinate (R, Theta ,Z) finite element analysis with a trigonal ring element has been developed for analysis of the complex geometry of the recessed cathode array. Some principles for estimating sensitivity, response time, stability, diffusion crosstalk, and flow independence concurrently are provided. It is found that the microhole with a vertical wall is more effective in limiting the diffusion field than the wall slope with the same H/D ratio. In order to avoid the crosstalk of the diffusion fields of two microholes, their central distance must be larger than 1.9 D. A microhole cathode array three-electrode oxygen sensor has been developed using the results of the model.<>
Keywords :
biosensors; crosstalk; electric sensing devices; electrochemical analysis; finite element analysis; micromechanical devices; optimisation; oxygen; design optimization; diffusion crosstalk; dissolved O/sub 2/ sensor; electrochemical sensor; finite element analysis; flow independence; mathematical model; microhole; recessed cathode array; response time; sensitivity; stability; three-electrode sensor; trigonal ring element; vertical wall; Cathodes; Crosstalk; Delay; Design optimization; Finite element methods; Geometry; Mathematical model; Sensor arrays; Sensor phenomena and characterization; Stability;
Conference_Titel :
Solid-State Sensors and Actuators, 1991. Digest of Technical Papers, TRANSDUCERS '91., 1991 International Conference on
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-87942-585-7
DOI :
10.1109/SENSOR.1991.148911
