Purpose

A fiber Bragg grating (FBG) sensor was designed to measure the door gap of automobile bodies.

Design/methodology/approach

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.

Findings

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.

Originality/value

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.

中文翻译：

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基于光纤布拉格光栅传感的磁吸压缩式间隙传感器

目的

设计了光纤布拉格光栅（FBG）传感器来测量车身的门间隙。

设计/方法/方法

间隙传感器是通过滑动楔形件和悬臂梁的组合设计的，涉及磁力安装和力传递点的弧形结构。此外，滑块采用了抗磁性和耐磨材料，并对两个FBG进行了温度补偿。检查传感器的磁力和接触应力，以确保传感器表现出一定的磁引力和疲劳寿命。通过实验检查了间隙传感器的性能。

发现

该传感器可以测量5mm至11mm的间隙，其灵敏度和测量精度分别为150.9 pm / mm和0.0063％FS。而且，该传感器显示出小的间隙灵敏度，具有0.15％的重复性误差，抗蠕变性能和磁干扰能力。

创意/价值

该传感器结构紧凑且易于安装，并且可用于多个传感器位置，最大尺寸为43 mm，质量为26 g，安装类型为磁吸。它可用于分辨率为0.013 mm的门内部间隙的高精度静态和动态测量，以提高内部间隙的在线分析和装配质量检查的效率。