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Sensors 2016, 16(8), 1207; doi:10.3390/s16081207

Passive Wireless Hermetic Environment Monitoring System for Spray Painting Workshop

1
Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096, China
2
Smart Integrated Sensor Engineering Center, Jiangsu R & D Center for Internet of Things, Wuxi 214135, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vamsy Chodavarapu
Received: 12 June 2016 / Revised: 22 July 2016 / Accepted: 26 July 2016 / Published: 1 August 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [6243 KB, uploaded 1 August 2016]   |  

Abstract

Passive wireless sensors have the advantages of operating without a power supply and remote sensing capability. Hence, they are very suitable for some harsh environments, such as hermetic environments, rotating parts, or very high temperature environments. The spray painting workshop is such a harsh environment, containing a large amount of flammable paint mist and organic gas. Aiming at this special environment of spray painting workshop, a passive wireless hermetic environment monitoring system was designed, fabricated, and demonstrated. The proposed system is composed of a transponder and a reader, and the circuit design of each part is given in detail in this paper. The power and the data transmission between the transponder and the reader are realized by the inductive coupling mechanism. Utilizing the back scatter modulation and channel multiplexing, the frequency signals generated by three different environmental sensors—together with their interfaces in the transponder—are wirelessly read out by the reader. Because of the harsh environment of the spray painting room, the package of the monitoring system is quite important. Three different kinds of filter films for the system package were compared. The experimental results show that the composite filter film aluminum anodic oxide/polytetrafluoroethylene (AAO/PTFE) has the best performance. After fabrication, the measured temperature, humidity, and pressure sensitivities were measured and found to be 180 Hz/°C in the range of 0~60 °C, 100 Hz/%RH in the range of 15~95 %RH, and 42 Hz/hPa in the range of 600~1100 hPa, respectively. Additionally, the remote sensing distance of the monitoring system reaches 4 cm. Finally, the passive wireless hermetic environment monitoring system was installed on the glass wall of the spray painting workshop and was successfully demonstrated. View Full-Text
Keywords: passive wireless; environment monitoring; inductive coupling; spray painting workshop passive wireless; environment monitoring; inductive coupling; spray painting workshop
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, L.; Ma, J.; Huang, Y.; Tang, D.; Huang, Q.-A. Passive Wireless Hermetic Environment Monitoring System for Spray Painting Workshop. Sensors 2016, 16, 1207.

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