Acoustic Emission Source Location Using a Distributed Feedback Fiber Laser Rosette

Acoustic Emission Source Location Using a Distributed Feedback Fiber Laser Rosette

This paper proposes an approach for acoustic emission (AE) source localization in a large marble stone using distributed feedback (DFB) fiber lasers. The aim of this study is to detect damage in structures such as those found in civil applications. The directional sensitivity of DFB fiber laser is investigated by calculating location coefficient using a method of digital signal analysis. In thi...

Acoustic Emission Source Location in Steel Structures Using a Wavelet Transform Analysis and Modal Location Theory

Source location is an important feature of acoustic emission (AE) damage monitoring in steel structures. The ability to accurately locate sources can assist in source characterisation and early warning of failure. This paper describe the development of a novel AE source location technique termed “ Wavelet Transform analysis and Modal Location (WTML)” based on Lamb wave theory and time-frequency...

A Lab-scale Digital Acoustic Emission System for Source Location

coustic emission (AE) techniques have been used * of arrival-time differences (delta-T’s) for each mesh point. To in the study of crack location, cracking mecha‘ calculate the source position for a set of burst-type AE signisms, deformation of metals and leak detection. : nals, a straightforward “shift and a d d method was used. A In these techniques, AE sensors hit by transient . First, assumi...

Multiwavelength generation in a random distributed feedback fiber laser using an all fiber Lyot filter.

Multiwavelength lasing in the random distributed feedback fiber laser is demonstrated by employing an all fiber Lyot filter. Stable multiwavelength generation is obtained, with each line exhibiting sub-nanometer line-widths. A flat power distribution over multiple lines is obtained, which indicates that the power between lines is redistributed in nonlinear mixing processes. The multiwavelength ...

Smart Feedback Control for Fiber-optics Acoustic Emission Sensor System