808 Basic Study on Acoustic Emission Measurement Using Fiber Bragg Grating : Application to CFRP Laminate

Fiber Bragg grating (FBG) is an optical fiber sensor and is suitable for acoustic emission (AE) measurements of structures such as chemical plants that require water resistance, explosion proofing, and so forth, However, directionality has been a problem in conventional usage which glues the grating range of an FBG to the inspection surface. This study proposes a cylinder-FBG (C-FBG) sensor with the FBG glued to a cylindrical sensor holder. Effectiveness of the sensor was evaluated by characterizing directionality and frequency sensitivity of the sensor and by comparing the detected AE signals in a 3-point bending test of a carbon fiber reinforced plastic (CFRP) laminate against a conventional wide-band piezoelectric AE sensor. The features of the detected signals were similar to the signals detected by the wide-band AE sensor. These results show that it is possible to produce a wide-band cylindrical sensor without the directionality limitations of the conventional usage of FBG.

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Fibre Bragg Grating Based Acoustic Emission Measurement System for Structural Health Monitoring Applications

Materials ◽

10.3390/ma14040897 ◽

2021 ◽

Vol 14 (4) ◽

pp. 897

Author(s):

Sagar Jinachandran ◽

Ginu Rajan

Keyword(s):

Acoustic Emission ◽

Structural Health Monitoring ◽

Health Monitoring ◽

Market Potential ◽

Bragg Grating ◽

Fibre Bragg Grating ◽

Emission Measurement ◽

Structural Health ◽

Sensing Systems ◽

Recent Trends

Fiber Bragg grating (FBG)-based acoustic emission (AE) detection and monitoring is considered as a potential and emerging technology for structural health monitoring (SHM) applications. In this paper, an overview of the FBG-based AE monitoring system is presented, and various technologies and methods used for FBG AE interrogation systems are reviewed and discussed. Various commercial FBG AE sensing systems, SHM applications of FBG AE monitoring, and market potential and recent trends are also discussed.

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Körperschallemission in CFK und Fräswerkzeugen/Acoustic emission in CFRP and milling tools – Analysis of emitted acoustic emission in analogous experiments

wt Werkstattstechnik online ◽

10.37544/1436-4980-2021-07-08-27 ◽

2021 ◽

Vol 111 (07-08) ◽

pp. 495-500

Author(s):

Eckart Uhlmann ◽

Tobias Holznagel ◽

Sebastian Ospina Mora

Keyword(s):

Acoustic Emission ◽

Tool Wear ◽

Process Monitoring ◽

Detailed Examination ◽

Data Driven ◽

Material Damage ◽

Emission Measurement ◽

Wear Rates ◽

Milling Tools ◽

Acoustic Emission Measurement

Herausforderungen bei der spanenden Bearbeitung von CFK sind unerwünschte Materialschädigungen im Bauteil sowie hohe Werkzeugverschleißraten. Für diese Arbeit wurden zerstörende Analogversuche an CFK und diamantbeschichteten Hartmetallproben durchgeführt und die Körperschallmesssignale analysiert. Die eingehende Untersuchung der Messwerte aus den Analogversuchen kann zu einer datengetriebenen Parametrierung einer körperschallbasierten Prozessüberwachung für die Fräsbearbeitung von CFK beitragen.   Challenges in machining CFRP are unwanted material damage in the component and high tool wear rates. For this work, destructive analogy experiments were carried out on CFRP and diamond-coated milling tools while analyzing the acoustic emission measurement signals. The detailed examination of the measured values from the analogy experiment can contribute to a data-driven parameterization of an acoustic emission-based process monitoring for the milling of CFRP.

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Cyclic Plasticity of Pure Aluminum Studies by Continuous Acoustic Emission Measurement

Nondestructive Characterization of Materials II ◽

10.1007/978-1-4684-5338-6_29 ◽

1987 ◽

pp. 299-307

Author(s):

A. Slimani ◽

P. Fleischmann ◽

R. Fougères

Keyword(s):

Acoustic Emission ◽

Pure Aluminum ◽

Cyclic Plasticity ◽

Emission Measurement ◽

Acoustic Emission Measurement

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Fiber Bragg Grating Acoustic Emission Demodulation System

Springer Proceedings in Physics - Advances in Acoustic Emission Technology ◽

10.1007/978-3-030-12111-2_8 ◽

2019 ◽

pp. 75-83

Author(s):

Yang Yu ◽

Xiangyin Bu ◽

Bo Liu ◽

Ping Yang

Keyword(s):

Acoustic Emission ◽

Fiber Bragg Grating ◽

Bragg Grating

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Application of Fiber Bragg Grating Acoustic Emission Sensors in Thin Polymer-Bonded Explosives

Sensors ◽

10.3390/s18113778 ◽

2018 ◽

Vol 18 (11) ◽

pp. 3778 ◽

Cited By ~ 2

Author(s):

Tao Fu ◽

Peng Wei ◽

Xiaole Han ◽

Qingbo Liu

Keyword(s):

Acoustic Emission ◽

Fiber Bragg Grating ◽

Bragg Grating ◽

Location Method ◽

Thin Polymer ◽

Time Coefficient ◽

Polymer Bonded Explosives ◽

Acoustic Emission Sensors

Fiber Bragg grating (FBG) acoustic emission (AE) sensors have been used in many applications. In this paper, based on an FBG AE sensor, the sensing principle of the interaction between the AE wave and the sensor is introduced. Then, the directionality of the FBG AE sensor on the surface of a thin polymer-bonded explosive (PBX) material is studied. Finally, the time coefficient location method is proposed to correct the AE time detected by the FBG AE sensor, thereby improving the accuracy of location experiments.

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