{"title":"A simple, low-cost non-dispersive infrared CO/sub 2/ monitor","authors":"Song Chen, T. Yamaguchi, K. Watanabe","doi":"10.1109/SFICON.2002.1159816","DOIUrl":null,"url":null,"abstract":"A non-dispersive infrared (NDIR) CO/sub 2/ monitor is developed for air quality assessment, The NDIR CO/sub 2/ sensor consists of one IR source, a pipe in which IR beam interacts with CO/sub 2/ molecules in the air, and a beam splitter terminated by two thermopiles with optical band-pass windows. One thermopile measures the spectrum absorption due to CO/sub 2/ molecules, while the other monitors the light emission level of the IR source. The signal processing electronics take the ratio between the outputs of the two detectors to make the CO/sub 2/ concentration measurement insensitive to the aging of the IR source and temperature. The ratio is a nonlinear function of CO/sub 2/ concentration and the cubic spline function is used for the linearization and the calibration. A prototype monitor demonstrates performances quite satisfactory for practical applications.","PeriodicalId":294424,"journal":{"name":"2nd ISA/IEEE Sensors for Industry Conference,","volume":"98 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2002-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2nd ISA/IEEE Sensors for Industry Conference,","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/SFICON.2002.1159816","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
A non-dispersive infrared (NDIR) CO/sub 2/ monitor is developed for air quality assessment, The NDIR CO/sub 2/ sensor consists of one IR source, a pipe in which IR beam interacts with CO/sub 2/ molecules in the air, and a beam splitter terminated by two thermopiles with optical band-pass windows. One thermopile measures the spectrum absorption due to CO/sub 2/ molecules, while the other monitors the light emission level of the IR source. The signal processing electronics take the ratio between the outputs of the two detectors to make the CO/sub 2/ concentration measurement insensitive to the aging of the IR source and temperature. The ratio is a nonlinear function of CO/sub 2/ concentration and the cubic spline function is used for the linearization and the calibration. A prototype monitor demonstrates performances quite satisfactory for practical applications.
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