振动环境下微小间隙的光栅测量法

Tiny clearance measurements by fiber grating sensor under vibration environment

摘要:

为测量振动环境下层间结构内部微小间隙的相对变化，设计了一种用于狭小空间内的平直光栅传感器。根据指定应用条件研究设计光栅传感基片的封装方案及其主要技术指标，并制作出平直光栅传感器。该传感器测量范围0.5 mm~0.8 mm，标定指标良好。通过试验应用证明，采用光栅传感器可实现振动环境下微小间隙的直接测量，且不用破坏原结构，与传统方法相比，数据真实可信，满足测量精确度μm量级要求。

Abstract:

A new flat fiber grating sensor used in narrow space is designed for measuring dynamic tiny clearance under vibration environment. According to given application conditions, substrate encapsulation scheme and its main technical indicators of the grating sensor are designed, and the measurement range is from 0.5 mm to 0.8 mm with good calibration data. The experiment results show that the grating sensor can realize the tiny clearance measuring under vibration environment without damaging the original structure; and it can provide authentic data with the precision scale of μm, which is superior to traditional methods.