SAW-based Gasket Sensor Design for Bolt Loosening Detection

This paper proposes a gasket-type bolt loosening detection sensor based on a surface acoustic wave (SAW) strain-sensitive unit. In order to improve the performance of the sensor, experiments, and simulations analyzed the influence of gel thickness on the strain-sensitive element of the SAW unit. Secondly, the influence of the thickness change of the secondary packaging structure on the packaging structure is studied, and the influence of friction change on the performance of the gasket sensor under different working conditions is discussed through experiments. Experimental and simulation results show that the gasket sensor proposed in this paper can effectively and accurately detect bolt looseness in real-time.