{"title":"Algorithms to improve the selectivity of thermally-cycled tin oxide gas sensors","authors":"W.M. Sears, K. Colbow, Franco Consadori","doi":"10.1016/0250-6874(89)87084-2","DOIUrl":null,"url":null,"abstract":"<div><p>The conductance of a commercial tin oxide gas sensor (TGS#812) is measured as a function of concentration for a number of different gases under conditions of thermal cycling. This information is used to examine the criteria that could be used to improve the selectivity of detection. Different conductance-time curves (signatures) are seen for the various gases tested, which show gas-specific concentration dependences. Algorithms are presented that can distinguish the responses to propane, carbon monoxide or hydrogen from each other and from other gases (alcohols) over wide ranges of concentration. Irreversible poisoning effects occur under long-term exposure of the sensor to strong reducing gases, such as high concentrations of CO or H<sub>2</sub>. However, the conditions causing poisoning do not apply in most practical applications of gas sensors.</p></div>","PeriodicalId":101159,"journal":{"name":"Sensors and Actuators","volume":"19 4","pages":"Pages 333-349"},"PeriodicalIF":0.0000,"publicationDate":"1989-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0250-6874(89)87084-2","citationCount":"84","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Sensors and Actuators","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0250687489870842","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 84
Abstract
The conductance of a commercial tin oxide gas sensor (TGS#812) is measured as a function of concentration for a number of different gases under conditions of thermal cycling. This information is used to examine the criteria that could be used to improve the selectivity of detection. Different conductance-time curves (signatures) are seen for the various gases tested, which show gas-specific concentration dependences. Algorithms are presented that can distinguish the responses to propane, carbon monoxide or hydrogen from each other and from other gases (alcohols) over wide ranges of concentration. Irreversible poisoning effects occur under long-term exposure of the sensor to strong reducing gases, such as high concentrations of CO or H2. However, the conditions causing poisoning do not apply in most practical applications of gas sensors.
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