An Experimental Study on the Process Monitoring of Resin Transfer Molded Composite Structures Using Fiber Optic Sensors

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Mehmet Yildiz ◽  
Nazli G. Ozdemir ◽  
Gokhan Bektas ◽  
Casey J. Keulen ◽  
Talha Boz ◽  
...  
Keyword(s):  
Process Monitoring ◽  
Composite Structures ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Fresnel Reflection ◽  
Cure Monitoring ◽  
Rtm Process ◽  
Fiber Reinforcements ◽  
Fbg Sensors

Research conducted on in situ process monitoring of resin transfer molded composites with fiber optic sensors is presented. A laboratory scale resin transfer molding (RTM) apparatus was designed and built with the capability of embedding fiber optic sensors and visually observing the resin filling process. Both fiber Bragg grating (FBG) and etched fiber (EF) sensors are embedded into glass fiber reinforcements in the RTM mold and used to monitor the resin flow front and cure. The cure cycle of the resin system utilized in this work is also studied using a Fresnel reflection refractometer (FRR) sensor. The results of this study show that both the FBG and EF sensors can be used efficiently for flow and cure monitoring of the RTM process. The experimental results of the EF and FRR sensors agree with those of the FBG sensors for cure monitoring.

Design of an Embedded Sensor Network for Manufacturing Process Monitoring, Quality Control Management and Structural Health Assessment of Advanced Composite Structures

2010 ◽  
Author(s):  
Casey Keulen ◽  
Bruno Rocha ◽  
Afzal Suleman ◽  
Mehmet Yildiz
Keyword(s):  
Sensor Network ◽  
Health Monitoring ◽  
Composite Structures ◽  
Fiber Optic ◽  
Lamb Waves ◽  
Fiber Optic Sensors ◽  
Composite Panels ◽  
Fiber Sensors ◽  
Structural Health ◽  
Fbg Sensors

This paper proposes the use of an embedded network of fiber optic sensors for process and Structural Health Monitoring (SHM) of Resin Transfer Molded (RTM) composite structures. A single sensor network is used at each stage of life of a RTM composite panel: flow monitoring, cure monitoring and health monitoring. A laboratory scale RTM apparatus was designed and built with the capability of visually monitoring the resin filling process. A technique for embedding fiber optic sensors into the mold has also been developed. Both Fiber Bragg Gratings (FBG) and Etched Fiber Sensors (EFS) have been embedded in composite panels using the apparatus. Etched Fiber Sensors have the capability of detecting the presence of resin. The sensors have proven to be capable of detecting the presence of resin at various locations as it is injected into the mold and have the capability of being multiplexed with FBGs thus reducing the number of ingress/egress locations required per sensor. Two FBGs and three EFSs were embedded on a single optical fiber. Tensile test specimens that contain embedded FBG sensors have also been produced with this apparatus. These specimen and embedded sensors have been characterized using a strain gage and a material testing machine. FBG sensors have been embedded into composite panels also in a manner that is conducive to detecting Lamb waves generated with a centrally located PZT. To detect Lamb waves a high speed, high precision sensing technique is required for embedded FBGs, since these guided waves travel through the material at very high velocities, presenting relatively small strain amplitudes. A technique based in a filter consisting of a second FBG was developed. Since this filter is not dependant on moving parts, it does not limit the velocity or frequency at which the tests can be performed. Preliminary tests performed using this filter showed that it is possible to detect Lamb waves with amplitudes smaller than 1 microstrain. A damage detection algorithm has been developed and is applied to this system in an attempt to detect and localize damages (cracks and delaminations) in the composite structure.

Cure monitoring of the liquid composite molding process using fiber optic sensors

1997 ◽  
Vol 18 (1) ◽  
pp. 133-150 ◽  
Author(s):  
Dara L. Woerdeman ◽  
Julie K. Spoerre ◽  
Kathleen M. Flynn ◽  
Richard S. Parnas
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Liquid Composite Molding ◽  
Molding Process ◽  
Cure Monitoring ◽  
Composite Molding

scholarly journals Implementation of a Mobile Platform Based on Fiber Bragg Grating Sensors for Automotive Traffic Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1567 ◽  
Author(s):  
Kivilcim Yuksel ◽  
Damien Kinet ◽  
Karima Chah ◽  
Christophe Caucheteur
Keyword(s):  
Fiber Optic ◽  
Traffic Monitoring ◽  
Fiber Optic Sensors ◽  
Mobile Platform ◽  
Vehicle Speed ◽  
Distributed Monitoring ◽  
Fiber Bragg Grating Sensors ◽  
Weigh In Motion ◽  
Monitoring Applications ◽  
Fbg Sensors

Instrumentation techniques, implementation and installation methods are major concerns in today’s distributed and quasi-distributed monitoring applications using fiber optic sensors. Although many successful traffic monitoring experiments have been reported using Fiber Bragg Gratings (FBGs), there has been no standardized solution proposed so far to have FBG seamlessly implemented in roads. In this work, we investigate a mobile platform including FBG sensors that can be positioned on roads for the purpose of vehicle speed measurements. The experimental results prove the efficiency of the proposed platform, providing a perspective toward weigh-in-motion systems.

Fiber Optic Sensor Development for Real-Time In-Situ Epoxy Cure Monitoring

1997 ◽  
Vol 31 (1) ◽  
pp. 87-102 ◽  
Author(s):  
Y. M. Liu ◽  
C. Ganesh ◽  
J. P. H. Steele ◽  
J. E. Jones
Keyword(s):  
Real Time ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Sensor Development ◽  
Cure Monitoring ◽  
Optic Sensor
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