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.
Highlights
The sensor technology has penetrated into industry and daily life in all aspects [1].traditional sensors are not easy, or even unable, to measure some harsh environments, such as sealed environments, rotating parts, or very high temperature environments
The proposed system is composed of a transponder demonstrated for the spray painting workshop
The proposed system is composed of a transponder and a reader, and circuit design of each part is given in detail
Summary
The sensor technology has penetrated into industry and daily life in all aspects [1]. Using ferroelectric as the temperature sensingmulti-parameter material, a passive wireless temperature sensor is reported in [13], In thisceramic study, passive wireless sensing technology was used to monitor the which can work in environments with temperatures up to 700 °C. Adding back-scatter modulation together with channel multiplexing into For example, humidity, and pressure—of a spray painting workshop need to be monitored in real time. The passive wireless sensing technology is very suitable for this situation, which humidity, and pressure—of a spray painting workshop need to be monitored in real time.
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