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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2016
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| Online Access: | https://www.redalyc.org/articulo.oa?id=47444851001 |
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Table of Contents:
- Chemical sensor network for pH monitoring Claudia Manjarrés David Garizado Maria Obregon Natalia Socarras Maria Calle Cecilia Jimenez-Jorquera Ingeniería pH TDMA ISFET Pseudo Water resources Monitoring of water sources is a major concern worldwide. Wireless sensor networks (WSN) may be used for this monitoring. However, current systems employ mainly physical sensors for variables such as temperature, pressure, humidity and light. Wireless chemical sensors networks (WCSNs) for environmental monitoring are scarce due to the lack of autonomy of conventional sensors. This paper presents results of a WCSN for monitoring pH based on ion selective field effect transistors (ISFETs). Sensing nodes employ a human interface required for in situ calibration of chemical sensors. Unlike most studies, our work evaluates the network employing chemical measurements and wireless network metrics. Results show zero packet losses by using a time division multiple access (TDMA) protocol. The network allows wireless communication within 300 m including attenuation from buildings and trees. Therefore, the system presented in this paper is suitable for long range applications with unobstructed line of sight. pH measurements present a standard deviation below 1%, showing high repeatability. When compared to a commercial pH meter, difference in measurements is below 5%. As a consequence, accuracy is adequate for the application. Measurements also presented high stability during 3 h of continuous measurement. 2016 artículo científico 1665-6423 https://www.redalyc.org/articulo.oa?id=47444851001 en http://www.redalyc.org/revista.oa?id=474 Journal of Applied Research and Technology application/pdf Universidad Nacional Autónoma de México Journal of Applied Research and Technology (México) Num.1 Vol.14