Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 498172
Title Improving the limits of detection in potentiometric sensors
Author(s) Bent, J.F. Van Der; Puik, E.C.N.; Tong, H.D.; Rijn, C.J.M. Van
Source Measurement Science and Technology 26 (2015)12. - ISSN 0957-0233 - 8 p.
DOI https://doi.org/10.1088/0957-0233/26/12/125104
Department(s) Laboratory for Organic Chemistry
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) digital signal processing - drift reduction - limits of detection - potentiometric sensors - wireless sensor networks
Abstract

Potentiometric sensors will generally suffer from unwanted responses as a result to changing temperatures by generating an electromotive force. Typically, this voltage drift has a non-linear character and therefore it is difficult to compensate using linear algorithms implemented in the analogue domain. A solution is proposed to improve the sensor characteristics by combining the digitized output of two CO2 rubidium silver iodide sensors with a specially designed digital algorithm to improve the limits of detection (LOD). Experiments show that this method has the capability to improve the LOD of the sensor with a factor 4.5x during temperature variations of 22 °C over a measurement period of 22 h. It enables potentiometric sensors to be used in low power wireless sensor networks for long term air quality control. Furthermore, the influence of depletion of the rubidium silver iodide electrolyte layer can be effectively compensated by determining the decay of the active layer according to the Nernst equation. Knowing the function of depletion over time helps to correct the sensor output and thereby improves the accuracy of the sensor.

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