In order to solve the problems of poor stability,weak anti-interference ability and short transmission distance of existing passive wireless sensors,a new type of passive wireless strain sensor was proposed.The sensor consists of two coils and a volume acoustic sensor,which includes a force transmission structure and a quartz wafer,which converts the strain on the measured surface into a detectable quartz resonant frequency shift.Firstly,a semi-elliptical contact model was established to study the effects of contact force,excitation voltage,and contact element shape on quartz to improve sensor performance.The second,design a quartz loading device to realize the loading of small forces on the quartz surface.Last,build a passive wireless strain sensing system,the transmission distance can reach 5 cm,the resolution is about 4.2 Hz/με,the strain measurement range is 600 µε,and the repeatability is 5.47％.The experimental results show that the sensing system has good performance,and will be combined with UAVs in the future to provide an effective solution for large-scale structural strain measurement.
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