A fiber Bragg grating (FBG) sensor was designed to measure the door gap of automobile bodies.
The gap sensor was designed through a combination of the sliding wedge and cantilever beam, involving a magnetic force installation and arc structure of the force transmission point. Moreover, the sliding block adopted an anti-magnetic and wear-resistant material and the temperature compensation of the two FBGs was conducted. The magnetic force and contact stress of the sensor were examined to ensure that the sensor exhibited a certain magnetic attraction force and fatigue life. The performance of the gap sensor was examined experimentally.
The sensor could measure gaps with dimensions of 5 mm to 11 mm, with a sensitivity and measurement accuracy of 150.9 pm/mm and 0.0063% F.S., respectively. Moreover, the sensor exhibited a small gap sensitivity, with a repeatability error of 0.15%, anti-creep properties and magnetic interference abilities.
The sensor is compact and easy to install, as well as use for multiple sensor locations, with a maximum size of 43 mm, a mass of 26 g and installation type of magnetic suction. It can be used for high-precision static and dynamic measurements of the door inner clearance with a resolution of 0.013 mm to improve the efficiency of internal clearance on-line analysis and assembly quality inspection.
This study was supported by the Natural Science Fund of Hubei Province in China under grant no. 2019CFB590 and National Natural Science Foundation of China under grant no. 51505187.
Meng, L., Li, X. and Tan, X. (2021), "Magnetic suction compression-type gap sensor based on fiber Bragg grating sensing", Sensor Review, Vol. 41 No. 2, pp. 144-152. https://doi.org/10.1108/SR-11-2020-0267
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