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Wireless sensor node for surface seawater density measurements.

Baronti F, Fantechi G, Roncella R, Saletti R - Sensors (Basel) (2012)

Bottom Line: The electronics are designed so that different kinds of wireless networks can be used, by simply changing the wireless module and the relevant firmware of the microcontroller.Lastly, laboratory and at-sea tests are presented and discussed in order to highlight the functionality and the performance of a prototype of the wireless density meter node in a Bluetooth radio network.The experimental results show a good agreement of the values of the calculated density compared to reference hydrometer readings.

View Article: PubMed Central - PubMed

Affiliation: Dipartimento di Ingegneria dell'Informazione: Elettronica, Informatica, Telecomunicazioni, University of Pisa, Pisa, Italy. f.baronti@iet.unipi.it

ABSTRACT
An electronic meter to measure surface seawater density is presented. It is based on the measurement of the difference in displacements of a surface level probe and a weighted float, which according to Archimedes' law depends on the density of the water. The displacements are simultaneously measured using a high-accuracy magnetostrictive sensor, to which a custom electronic board provides a wireless connection and power supply so that it can become part of a wireless sensor network. The electronics are designed so that different kinds of wireless networks can be used, by simply changing the wireless module and the relevant firmware of the microcontroller. Lastly, laboratory and at-sea tests are presented and discussed in order to highlight the functionality and the performance of a prototype of the wireless density meter node in a Bluetooth radio network. The experimental results show a good agreement of the values of the calculated density compared to reference hydrometer readings.

Show MeSH
Water density values calculated by the wireless density meter node and by the reference glass hydrometer, as a function of the theoretical density value determined by the quantity of diluted salt in distilled water.
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f6-sensors-12-02954: Water density values calculated by the wireless density meter node and by the reference glass hydrometer, as a function of the theoretical density value determined by the quantity of diluted salt in distilled water.

Mentions: Finally, laboratory tests were also performed at room temperature (25 °C) in water with different density values. A controlled quantity of salt was added to the distilled water and the sensor node was used to calculate the density. The density was also measured at the same time with the reference glass hydrometer. Figure 6 shows the values of the densities measured by the wireless sensor node and by the hydrometer as a function of the theoretical water density value at that temperature, as determined by the amount of salt added to the distilled water. It is worth noting that the density calculated by the wireless sensor node is in excellent agreement with the reference value measured. Finally, the knowledge of the water temperature enables compensation for the temperature induced variations of the water density and calculation of the density at 4 °C for that seawater sample.


Wireless sensor node for surface seawater density measurements.

Baronti F, Fantechi G, Roncella R, Saletti R - Sensors (Basel) (2012)

Water density values calculated by the wireless density meter node and by the reference glass hydrometer, as a function of the theoretical density value determined by the quantity of diluted salt in distilled water.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3376632&req=5

f6-sensors-12-02954: Water density values calculated by the wireless density meter node and by the reference glass hydrometer, as a function of the theoretical density value determined by the quantity of diluted salt in distilled water.
Mentions: Finally, laboratory tests were also performed at room temperature (25 °C) in water with different density values. A controlled quantity of salt was added to the distilled water and the sensor node was used to calculate the density. The density was also measured at the same time with the reference glass hydrometer. Figure 6 shows the values of the densities measured by the wireless sensor node and by the hydrometer as a function of the theoretical water density value at that temperature, as determined by the amount of salt added to the distilled water. It is worth noting that the density calculated by the wireless sensor node is in excellent agreement with the reference value measured. Finally, the knowledge of the water temperature enables compensation for the temperature induced variations of the water density and calculation of the density at 4 °C for that seawater sample.

Bottom Line: The electronics are designed so that different kinds of wireless networks can be used, by simply changing the wireless module and the relevant firmware of the microcontroller.Lastly, laboratory and at-sea tests are presented and discussed in order to highlight the functionality and the performance of a prototype of the wireless density meter node in a Bluetooth radio network.The experimental results show a good agreement of the values of the calculated density compared to reference hydrometer readings.

View Article: PubMed Central - PubMed

Affiliation: Dipartimento di Ingegneria dell'Informazione: Elettronica, Informatica, Telecomunicazioni, University of Pisa, Pisa, Italy. f.baronti@iet.unipi.it

ABSTRACT
An electronic meter to measure surface seawater density is presented. It is based on the measurement of the difference in displacements of a surface level probe and a weighted float, which according to Archimedes' law depends on the density of the water. The displacements are simultaneously measured using a high-accuracy magnetostrictive sensor, to which a custom electronic board provides a wireless connection and power supply so that it can become part of a wireless sensor network. The electronics are designed so that different kinds of wireless networks can be used, by simply changing the wireless module and the relevant firmware of the microcontroller. Lastly, laboratory and at-sea tests are presented and discussed in order to highlight the functionality and the performance of a prototype of the wireless density meter node in a Bluetooth radio network. The experimental results show a good agreement of the values of the calculated density compared to reference hydrometer readings.

Show MeSH