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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
Architecture of the electronic part of the sensor node. The wireless module can be substituted with other types of modules by simply changing the microcontroller firmware.
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f2-sensors-12-02954: Architecture of the electronic part of the sensor node. The wireless module can be substituted with other types of modules by simply changing the microcontroller firmware.

Mentions: The MS linear displacement sensor provides a digital reading of the displacements of the two cursors on an output interface, in our case an RS-485 industrial interface. We need to provide additional electronics for its insertion as a node in the WSN. The sensor needs a wireless connectivity and a power supply source, to operate as an autonomous node. The wireless technology to be used strongly depends on the network in which we intend to insert the sensor node. The network could be optical, acoustic, or radiofrequency (RF) based, depending on the application [23–25]. In any case, the architecture chosen enables us to easily change the wireless link type and adapt the node to different networks. In fact, the wireless module can easily be replaced with other types, because the communication between the wireless module and the sensor is not direct. Instead, it is created by means of a 8-b microcontroller (μC) that acts as a bridge between the sensor and the wireless module, so that a different module type is managed by only changing the communication firmware. Figure 2 shows the architecture of the electronic part of the sensor node.


Wireless sensor node for surface seawater density measurements.

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

Architecture of the electronic part of the sensor node. The wireless module can be substituted with other types of modules by simply changing the microcontroller firmware.
© Copyright Policy
Related In: Results  -  Collection

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

f2-sensors-12-02954: Architecture of the electronic part of the sensor node. The wireless module can be substituted with other types of modules by simply changing the microcontroller firmware.
Mentions: The MS linear displacement sensor provides a digital reading of the displacements of the two cursors on an output interface, in our case an RS-485 industrial interface. We need to provide additional electronics for its insertion as a node in the WSN. The sensor needs a wireless connectivity and a power supply source, to operate as an autonomous node. The wireless technology to be used strongly depends on the network in which we intend to insert the sensor node. The network could be optical, acoustic, or radiofrequency (RF) based, depending on the application [23–25]. In any case, the architecture chosen enables us to easily change the wireless link type and adapt the node to different networks. In fact, the wireless module can easily be replaced with other types, because the communication between the wireless module and the sensor is not direct. Instead, it is created by means of a 8-b microcontroller (μC) that acts as a bridge between the sensor and the wireless module, so that a different module type is managed by only changing the communication firmware. Figure 2 shows the architecture of the electronic part of the sensor node.

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