Abstract
This paper presents a simple and low cost solution for the implementation of a screw relaxing sensor based on ultra-high frequency (UHF) radio frequency identification (RFID) passive tags. The proposed method opportunistically uses the natural capability of a metallic screw (or a metallic part fixed on a plastic screw) to realize an electrical continuity between two electrical lines, which is exploited to realize an open/closed switch mechanism associated to the tightened/relaxed screw status. Several switch-like possible realizations are described according to different working environments and situations, as well as tag-sensor implementation schemes. Three tag-sensors are designed and manufactured to comply with metallic or non-metallic application surfaces and to work within the UHF RFID Chinese band 920.5 – 924.5 MHz, showing a reliable discrimination capability between well-tightened and relaxed screw states. Finally, parameters such as maximum detection surface and minimum detection time are evaluated for completing the analysis of the presented detection system.
Highlights
INTRODUCTIONThe Internet-of-Things (IoT) scenario in which a multitude of objects or people possess the ability to communicate and transfer data over a global network is attracting the interest of many private companies as well as industries, and many projects have been already conducted in areas such as agriculture, food processing industries, environmental monitoring, security surveillance, intelligent transportation system (ITS), healthcare [1]
The Internet-of-Things (IoT) scenario in which a multitude of objects or people possess the ability to communicate and transfer data over a global network is attracting the interest of many private companies as well as industries, and many projects have been already conducted in areas such as agriculture, food processing industries, environmental monitoring, security surveillance, intelligent transportation system (ITS), healthcare [1].The integration of different technologies is a key property of IoT scenario to build up powerful industrial systems and applications
EXPERIMENTAL RESULTS AND DISCUSSION experimental results of screw relaxing detection based on the presented opportunistic use of the screw movement and the ultra-high frequency (UHF) radio frequency identification (RFID) tag prototypes shown in Fig. 11 are presented
Summary
The Internet-of-Things (IoT) scenario in which a multitude of objects or people possess the ability to communicate and transfer data over a global network is attracting the interest of many private companies as well as industries, and many projects have been already conducted in areas such as agriculture, food processing industries, environmental monitoring, security surveillance, intelligent transportation system (ITS), healthcare [1]. A single node of a WSN is clearly more expensive than a RFID tag, and it requires a larger amount of energy [1] For this reason, the possibility to integrate sensing and monitoring functionalities in a RFID tag for implementing a low cost tag-sensor is recently being investigated [6], [7]. The possibility to integrate sensing and monitoring functionalities in a RFID tag for implementing a low cost tag-sensor is recently being investigated [6], [7] In such a case, information coming from a sensor is usually mapped into a tag antenna parameter variation, and this variation is employed to implement a data modulation mechanism for communicating with the reader device [7].
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