A Miniature Layered SAW Contact Stress Sensor for Operation in Cramped Metallic Slits


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Based on passive and wireless surface acoustic wave (SAW) sensing technology, a sensor terminal was designed to measure the contact stress in a cramped metallic slit with less than 0.5 mm in width. A layered structure of force-sensitive element with 0.5 mm in total thickness was put forward to package SAW resonator. Thin films with elasticity and flexibility were adopted to transfer load effectively between rigid surfaces. A flexible transmission line with double-stub structure and a patch microstrip antenna were used to realize the wireless interrogation to the sensor. The force-sensitive element model was built and simulated with FEA software (COMSOL Multiphysics). The sensor prototype exhibited significant linear and repeatable frequency shifts for the loads in the range of 0–4 MPa. The linearity error was ±3% of full-scale output (FSO), and the accuracy was ±1.25% FSO. The usage of elastic films in force-sensitive element caused hysteresis in output, but the hysteresis error was controlled in an acceptable range of ±3.8% FSO.

作者简介

Haining Li

School of Mechanical and Electrical Engineering

编辑信件的主要联系方式.
Email: haining_lee@126.com
中国, Chengdu, Si chuan, 611731

Jiexiong Ding

School of Mechanical and Electrical Engineering

Email: haining_lee@126.com
中国, Chengdu, Si chuan, 611731

Siqi Wei

School of Mechanical and Electrical Engineering

Email: haining_lee@126.com
中国, Chengdu, Si chuan, 611731

Bowen Chu

AVIC Chengdu Aircraft Industrial (Group) Co., Ltd.

Email: haining_lee@126.com
中国, Chengdu, Si chuan

Lichao Guan

School of Mechanical and Electrical Engineering

Email: haining_lee@126.com
中国, Chengdu, Si chuan, 611731

Li Du

School of Mechanical and Electrical Engineering

Email: haining_lee@126.com
中国, Chengdu, Si chuan, 611731

Guangmin Liu

Institute of Mechanical Manufacturing Technology

Email: haining_lee@126.com
中国, Mianyang, Si chuan, 621900

Jianguo He

Institute of Mechanical Manufacturing Technology

Email: haining_lee@126.com
中国, Mianyang, Si chuan, 621900

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