Environmental monitoring in grain

Parkinson, G.; Crutchley, Dominic J. P.; Green, Peter M; Antoniou, Michalis; Boon, M.C.; Green, Peter N.; Green, Peter R.; Sloan, R.; York, T.A.

doi:10.1109/imtc.2010.5488046

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…One example of such efforts is the study of real-time methods for link quality estimation for the industrial applications of wireless sensor nodes [ 11 ]. The applications of WSN and their nodes have been widely analyzed in areas such as agriculture [ 12 , 13 , 14 ], logistics [ 15 ], industry [ 11 , 16 ], military defense [ 17 ], among many others.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of a Portable Wireless PCB-MEMS Permittivity Sensor Node for Non-Invasive Liquid Recognition

2021

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Dielectric characteristics are useful to determine crucial properties of liquids and to differentiate between liquid samples with similar physical characteristics. Liquid recognition has found applications in a broad variety of fields, including healthcare, food science, and quality inspection, among others. This work demonstrates the fabrication, instrumentation, and functionality of a portable wireless sensor node for the permittivity measurement of liquids that require characterization and differentiation. The node incorporates an interdigitated microelectrode array as a transducer and a microcontroller unit with radio communication electronics for data processing and transmission, which enable a wide variety of stand-alone applications. A laser-ablation-based microfabrication technique is applied to fabricate the microelectromechanical systems (MEMS) transducer on a printed circuit board (PCB) substrate. The surface of the transducer is covered with a thin layer of SU-8 polymer by spin coating, which prevents it from direct contact with the Cu electrodes and the liquid sample. This helps to enhance durability, avoid electrode corrosion and contamination of the liquid sample, and to prevent undesirable electrochemical reactions to arise. The transducer’s impedance was modeled as a Randles cell, having resistive and reactive components determined analytically using a square wave as stimuli, and a resistor as a current-to-voltage converter. To characterize the node sensitivity under different conditions, three different transducer designs were fabricated and tested for four different fluids, i.e., air, isopropanol, glycerin, and distilled water—achieving a sensitivity of 1.6965 +/− 0.2028 εr/pF. The use of laser ablation allowed the reduction of the transducer footprint while maintaining its sensitivity within an adequate value for the targeted applications.

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Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of a Portable Wireless PCB-MEMS Permittivity Sensor Node for Non-Invasive Liquid Recognition

2021

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“…We are exploring possibilities for realising wireless sensor networks to monitor industrial processes [1]. In contrast to almost all other wireless sensor networks this work is characterised and challenged by the propagation of signals in confined spaces through materials that are not predominantly air.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Sensor Networks for Decommissioning

York¹,

Green²,

Green³

et al. 2012

Measurement and Control

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Progress is reported with an acoustic sensor network that offers the possibility to provide monitoring of nuclear storage ponds. The aim is to create a network that comprises a number of autonomous sensor nodes that communicate and localise using ultrasonic signals.The nodes are less than 20cm dimension and are able to manoeuvre themselves, horizontally and vertically, to selected positions where they can then record measurements of selected parameters. Ultrasonic signal propagation has been explored in a 6m benign test pond with representative clutter. The paper describes progress with communications, localisation and a small autonomous underwater vehicle. Results suggest that localisation might be achieved to an accuracy of about 10cm and data might be communicated up to 1 kbit/s assuming a bit error rate of 10-4.

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