Acoustic Emission Source Location Using a Distributed Feedback Fiber Laser Rosette

Sensors

Wenzhu Huang²  Wentao Zhang¹ 

[1] Optoelectronic System Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;

关键词: acoustic emission;    DFB fiber laser rosette;    directional sensitivity;    autocorrelation;    wavelet packet energy;    location algorithm;   

DOI  :  10.3390/s131014041

来源: mdpi

【 摘 要 】

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 this, autocorrelation is used to extract the location coefficient from the periodic AE signal and wavelet packet energy is calculated to get the location coefficient of a burst AE source. Normalization is processed to eliminate the influence of distance and intensity of AE source. Then a new location algorithm based on the location coefficient is presented and tested to determine the location of AE source using a Delta (Δ) DFB fiber laser rosette configuration. The advantage of the proposed algorithm over the traditional methods based on fiber Bragg Grating (FBG) include the capability of: having higher strain resolution for AE detection and taking into account two different types of AE source for location.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.