Automated AC Voltammetric Sensor for Early Fault Detection and Diagnosis in Monitoring of Electroplating Processes
An in situ sensor employing AC‐voltammetry techniques was designed to provide a response strongly affected by the presence of specific disturbances like foreign contaminants, accumulated degradation products, severely out‐of‐target concentrations of electroplating bath constituents and out‐of‐target...
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Published in | Electroanalysis (New York, N.Y.) Vol. 25; no. 1; pp. 278 - 288 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag
01.01.2013
WILEY‐VCH Verlag |
Subjects | |
Online Access | Get full text |
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Summary: | An in situ sensor employing AC‐voltammetry techniques was designed to provide a response strongly affected by the presence of specific disturbances like foreign contaminants, accumulated degradation products, severely out‐of‐target concentrations of electroplating bath constituents and out‐of‐target physical conditions of the plating process (i.e. temperature). Soft Independent Modelling of Class Analogy (SIMCA) is a pattern recognition method which describes each class separately in eigenvector space. In this supervised classification technique the projected new measurements are evaluated to determine whether they belong to a certain class or not. An automated analytical system was developed capable of collecting on‐line AC voltammetric data and investigating similarities between measurements in proper conditions and measurements with upset behavior with known disturbances which can be utilized to recognize a likely pattern of behavior. The shape differences between deformed and reference set voltammograms are quantified by Mahalanobis Distance (MD)‐SIMCA. In addition to the numerical approach, a graphical projection is utilized to diagnose the root cause of the detected process disturbances. |
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Bibliography: | ArticleID:ELAN201200380 ark:/67375/WNG-F5C605RH-C istex:96C5BBA7571C59C26B0156D099DFCF663BFA2831 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1040-0397 1521-4109 |
DOI: | 10.1002/elan.201200380 |