Impact monitoring of the aircraft composite structure using FBG sensor/PZT actuator hybrid sensor system

2007 ◽  
Author(s):  
Noritsugu Nakamura ◽  
Toshimichi Ogisu ◽  
Hiroshi Yoneda ◽  
Yoji Okabe ◽  
Nobuo Takeda ◽  
...  
Keyword(s):  
Composite Structure ◽  
Sensor System ◽  
Pzt Actuator ◽  
Fbg Sensor ◽  
Impact Monitoring

scholarly journals Impact monitoring in smart composites using stabilization-controlled FBG sensor system

2004 ◽  
Author(s):  
Hyung-Joon Bang ◽  
Sang-Wuk Park ◽  
Dae-Hyun Kim ◽  
Chang-Sun Hong ◽  
Chun-Gon Kim
Keyword(s):  
Sensor System ◽  
Smart Composites ◽  
Fbg Sensor ◽  
Impact Monitoring

Effect of tubing material on conventional and thin FBG sensor for embedded environment impact monitoring of CFRP composites

2016 ◽  
Author(s):  
Yurim Park ◽  
Pratik Shrestha ◽  
Hyunseok Kwon ◽  
Jin-Hyuk Kim ◽  
Heejung Kwon ◽  
...  
Keyword(s):  
Environment Impact ◽  
Fbg Sensor ◽  
Impact Monitoring ◽  
Cfrp Composites ◽  
Tubing Material

scholarly journals Intensity and Wavelength Division Multiplexing FBG Sensor System Using a Raman Amplifier and Extreme Learning Machine

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Yibeltal Chanie Manie ◽  
Run-Kai Shiu ◽  
Peng-Chun Peng ◽  
Bao-Yi Guo ◽  
Mekuanint Agegnehu Bitew ◽  
...  
Keyword(s):  
Extreme Learning Machine ◽  
Wavelength Division Multiplexing ◽  
Sensor System ◽  
Bragg Wavelength ◽  
Wavelength Division ◽  
Raman Amplifier ◽  
Fbg Sensor ◽  
Transmission Distance ◽  
Fbg Sensors ◽  
Learning Machine

A fiber Bragg grating (FBG) sensor is a favorable sensor in measuring strain, pressure, vibration, and temperature in different applications, such as in smart structures, wind turbines, aerospace, industry, military, medical centers, and civil engineering. FBG sensors have the following advantages: immune to electromagnetic interference, light weight, small size, flexible, stretchable, highly accurate, longer stability, and capable in measuring ultra-high-speed events. In this paper, we propose and demonstrate an intensity and wavelength division multiplexing (IWDM) FBG sensor system using a Raman amplifier and extreme learning machine (ELM). We use an IWDM technique to increase the number of FBG sensors. As the number of FBG sensors increases and the spectra of two or more FBGs are overlapped, a conventional peak detection (CPD) method is unappropriate to detect the central Bragg wavelength of each FBG sensor. To solve this problem, we use ELM techniques. An ELM is used to accurately detect the central Bragg wavelength of each FBG sensor even when the spectra of FBGs are partially or fully overlapped. Moreover, a Raman amplifier is added to a fiber span to generate a gain medium within the transmission fiber, which amplifies the signal and compensates for the signal losses. The transmission distance and the sensing signal quality increase when the Raman pump power increases. The experimental results revealed that a Raman amplifier compensates for the signal losses and provides a stable sensing output even beyond a 45 km transmission distance. We achieve a remote sensing of strain measurement using a 45 km single-mode fiber (SMF). Furthermore, the well-trained ELM wavelength detection methods accurately detect the central Bragg wavelengths of FBG sensors when the two FBG spectra are fully overlapped.

Ultra-long-distance (230 km) FBG sensor system

2008 ◽  
Author(s):  
Takanori Saitoh ◽  
Kenichi Nakamura ◽  
Yoshifumi Takahashi ◽  
Hiroyuki Iida ◽  
Yoshimitsu Iki ◽  
...  
Keyword(s):  
Sensor System ◽  
Long Distance ◽  
Fbg Sensor

A Design Based Materials Study for a Wearable Muscle Stretching Device Aimed at Patients With Spasticity

2007 ◽  
Author(s):  
Michael Bailey-Van Kuren ◽  
Carter Hamilton ◽  
Eduardo Rivera
Keyword(s):  
Composite Structure ◽  
Treatment Options ◽  
Current Treatment ◽  
Sensor System ◽  
Wearable Sensor ◽  
Thin Film Sensors ◽  
Muscle Stretching ◽  
Serial Casting ◽  
Muscle Groups ◽  
And Control

The efficacy of robotic systems in rehabilitation is well established. Many of these systems are fixed equipment that requires the user to visit a facility for treatment. Furthermore, current treatment options for pediatric patients with spastic dyplagia include manual stretching of the muscle groups and serial casting in conjunction with Botox injections. The goal of this work is to develop a dynamic orthotic to stretch the muscles of the lower calf. A subsystem of this project is the development of wearable sensor system to detect spasticity and control the system actuators. A system of thin film sensors embedded into a novel composite structure is proposed. In order to develop a dynamic orthotic to stretch the muscles of the lower calf, a subsystem of this project is the development of wearable sensor system embedded into a novel composite structure [1, 2, 3].

Monitoring the Como Railway Bridge based on dynamic FBG sensor system

2007 ◽  
Author(s):  
Jianzhong Zhang ◽  
Weimin Sun ◽  
G. D. Peng ◽  
Libo Yuan
Keyword(s):  
Sensor System ◽  
Railway Bridge ◽  
Fbg Sensor
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