Home // SENSORDEVICES 2017, The Eighth International Conference on Sensor Device Technologies and Applications // View article
Authors:
Mohammad Russel
Li Xiaomeng
Qu Meixue
Thomas Mascow
Keywords: microstrip; transmission line; printed sensing probe; pathogens; microwaves.
Abstract:
Freshwater ecosystem is playing a key role for maintaining a green environment. It is often subject to anthropogenic and natural hazards, which may adversely affect human health, natural resources and the general ecosystem. Therefore, it is a social urgency to protect the freshwater ecosystem by monitoring the quality of fresh water on regular time intervals. Available methods for monitoring the water quality are mostly laboratory-based, which is time-consuming, laborious and expensive. To solve this issue, we are proposing a printed, microwave-based, transmission-line sensor to better understand the electromagnetic behavior of pure culture of bacteria and algae cells in de-ionized water. This sensing technique is fast, robust, low-cost and requires a very simple sample preparation. We have designed a transmission-line, microstrip sensor that could be used for a wide frequency range. The sensor needs only 50µL of the sample and 60 seconds to analyze it. In this work, we have selected the fresh water algae Chlorella vulgaris GIEC-179 and the bacterium Pseudomonas aeruginosa to characterize their electromagnetic properties. We investigated their reflection coefficient (S11) resonance peak changes in both low (0.01GHz-1.0 GHz) and high (1.5-2.5 GHz) frequency ranges. The results shows that their S11 resonance peaks are identical with respect to the different concentrations of bacterial, algal and mixture of both in de-ionized water. We also have investigated their S11 parameters of their dead cells. The results indicated that for both alive and dead cells, the S11 peak shifts are significantly different from each other. This method could be a potential approach to real-time monitoring of the pathogenic detection of freshwater quality. Our proposed prototype sensor is able to detect bacterial cells in the range of 100 Cell/mL and algae 2.04 x 10-10 g/L, which is sensitive and selective enough for fresh water quality monitoring.
Pages: 124 to 128
Copyright: Copyright (c) IARIA, 2017
Publication date: September 10, 2017
Published in: conference
ISSN: 2308-3514
ISBN: 978-1-61208-581-4
Location: Rome, Italy
Dates: from September 10, 2017 to September 14, 2017