激光自混合光纤布拉格光栅声发射传感器。

Laser Self-Mixing Fiber Bragg Grating Sensor for Acoustic Emission Measurement.

机构信息

School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.

出版信息

Sensors (Basel). 2018 Jun 16;18(6):1956. doi: 10.3390/s18061956.

DOI:10.3390/s18061956

PMID:29914178

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6021966/

Abstract

Fiber Bragg grating (FBG) is considered a good candidate for acoustic emission (AE) measurement. The sensing and measurement in traditional FBG-based AE systems are based on the variation in laser intensity induced by the Bragg wavelength shift. This paper presents a sensing system by combining self-mixing interference (SMI) in a laser diode and FBG for AE measurement, aiming to form a new compact and cost-effective sensing system. The measurement model of the overall system was derived. The performance of the presented system was investigated from both aspects of theory and experiment. The results show that the proposed system is able to measure AE events with high resolution and over a wide dynamic frequency range.

摘要

光纤布拉格光栅（FBG）被认为是声发射（AE）测量的良好候选者。传统的基于 FBG 的 AE 系统中的传感和测量基于布拉格波长移动引起的激光强度变化。本文提出了一种通过结合激光二极管中的自混合干涉（SMI）和 FBG 进行 AE 测量的传感系统，旨在形成一种新的紧凑且经济高效的传感系统。推导了整个系统的测量模型。从理论和实验两个方面研究了所提出系统的性能。结果表明，所提出的系统能够以高分辨率和宽动态频率范围测量 AE 事件。