Open Air Calibration with Temperature Compensation of a Luminescence Quenching-Based Oxygen Sensor for Portable Instrumentation
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- 作者：Alberto J. Palma ; Javier Ló ; pez-Gonzá ; lez ; Luis J. Asensio ; Marí ; a Dolores Ferná ; ndez-Ramos ; Luis Fermí ; n Capitá ; n-Vallvey
- 刊名：Analytical Chemistry
- 出版年：2007
- 出版时间：April 15, 2007
- 年：2007
- 卷：79
- 期：8
- 页码：3173 - 3179
- 全文大小：123K
- 年卷期：v.79,no.8(April 15, 2007)
- ISSN：1520-6882
文摘
This report addresses the task of calibrating an opticalsensor for oxygen determination. Detailed analyses of thefunctional dependences from our measurement systemresults have been carried out with the additional aim oftemperature compensation. As a result, an empiricalcalibration function has been successfully derived for theluminescent quenching-based oxygen sensor included ina self-designed portable instrument. This function alsocompensates for the temperature influence on the quenching luminescence process in the range from 0 to 45 
C.Moreover, the calibration procedure is extremely simplebecause only a single standard is needed. In fact, theoxygen measurement system can be calibrated withexposure to an open air atmosphere, and therefore,neither laboratory standards nor trained personnel arerequired. The method has been applied to a set of 11 unitsof the mentioned sensor (up to 24% oxygen concentration)giving an overall deviation between our calibrated systemresults and the laboratory standards of 0.3% oxygenconcentration (calculated with 95% confidence level). Theproposed calibration function has shown itself to beapplicable for different sensing film thicknesses andluminophore concentrations using the same fittings parameter. Additionally, this function has been successfullyapplied to other oxygen dyes. Good agreement has alsobeen found when the performance of the instrument wascompared to a commercially available portable instrumentbased on an electrochemical sensor. We believe that thiswork could be an interesting finding for spreading the useof optical sensors for atmospheric oxygen determinationin commercial measurement equipment for differentpurposes in confined working atmospheres, such asmines, undergrounds, warehouses, vehicles, and ships.
C.Moreover, the calibration procedure is extremely simplebecause only a single standard is needed. In fact, theoxygen measurement system can be calibrated withexposure to an open air atmosphere, and therefore,neither laboratory standards nor trained personnel arerequired. The method has been applied to a set of 11 unitsof the mentioned sensor (up to 24% oxygen concentration)giving an overall deviation between our calibrated systemresults and the laboratory standards of 0.3% oxygenconcentration (calculated with 95% confidence level). Theproposed calibration function has shown itself to beapplicable for different sensing film thicknesses andluminophore concentrations using the same fittings parameter. Additionally, this function has been successfullyapplied to other oxygen dyes. Good agreement has alsobeen found when the performance of the instrument wascompared to a commercially available portable instrumentbased on an electrochemical sensor. We believe that thiswork could be an interesting finding for spreading the useof optical sensors for atmospheric oxygen determinationin commercial measurement equipment for differentpurposes in confined working atmospheres, such asmines, undergrounds, warehouses, vehicles, and ships.