Patch antenna sensor rosettes for surface strain measurement

Abstract

Passive (battery-free) wireless patch antenna sensors have been developed in recent years for strain sensing, to provide convenient and low-cost instrumentation. Despite past efforts, current analytical and experimental studies have mainly focused on performance in single-axial measurement, which is simple and unrealistic from typically encountered arbitrary plane stress fields. This paper presents strain sensor rosettes made of folded patch antennas and slotted patch antennas for measuring an arbitrary surface strain (plane stress) field. The transverse strain effect of both sensors is discussed and has been validated through laboratory experiments. Multiphysics coupled simulation is conducted to describe accurately the mechanical and electromagnetic behaviours of antenna sensors.Resonance frequency shifts of the antenna sensors are used to derive the three strain components in an arbitrary plane stress scenario -that is, two normal and one shear strain components. Both numerical studies and experimental validations have been performed.

Microstrip patch antenna for simultaneous strain and temperature sensing

“…Passive RFID sensors can be divided into chip-based or chipless RFID sensors based on whether there is an onboard integrated circuit (IC) chip. In recent years, chip-based RFID sensors have been proposed for temperature sensing [18][19][20][21][22][23] and for strain sensing [24][25][26][27][28][29] but not for simultaneous measurements of both parameters. Bhattacharyya et al measured the changes in temperature by monitoring the power backscattered by the tag [19].…”

“…The slots increase the current path and thus lower the frequency of the antenna. Since the RFID sensor can only measure strain along one direction, Li et al proposed a rosette configuration made of three antenna sensors for measuring multi-axial strain fields [28]. Despite these advances, the major drawbacks of RFID sensors, e.g.…”

Roadmap on measurement technologies for next generation structural health monitoring systems

“…Benefiting from the smaller size of the slotted patch antenna, strain sensor rosettes made of slotted patch antenna sensors are also studied to measure an arbitrary plane stress scenario that includes two normal and one shear strain components [126]. Simultaneous resonance frequency shifts of the three antenna sensors are used to derive the three strain components (figure 10).…”