High-speed MEMS swept-wavelength light source for FBG sensor system

2005 ◽  
Author(s):  
Takanori Saitoh ◽  
Kenichi Nakamura ◽  
Yoshifumi Takahashi ◽  
Koichiro Miyagi
Keyword(s):  
Light Source ◽  
High Speed ◽  
Sensor System ◽  
Fbg Sensor ◽  
Wavelength Light

Long-Distance FBG Sensor System Using High-Speed Swept-Wavelength Light Source

2006 ◽  
Author(s):  
Takanori Saitoh ◽  
Kenichi Nakamura ◽  
Yoshifumi Takahashi ◽  
Hiroyuki Iida ◽  
Yoshimitsu Iki ◽  
...  
Keyword(s):  
Light Source ◽  
High Speed ◽  
Sensor System ◽  
Long Distance ◽  
Fbg Sensor ◽  
Wavelength Light

Fracture Monitoring of Composite Wind Turbine Blade Using High-Speed Bragg Grating Sensor System

2011 ◽  
Vol 109 ◽  
pp. 79-83 ◽  
Author(s):  
Hyung Joon Bang ◽  
Soo Hyun Kim
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
High Speed ◽  
Performance Test ◽  
Turbine Blades ◽  
Wind Turbine Blade ◽  
Sensor System ◽  
Bragg Grating ◽  
Fbg Sensor ◽  
Fbg Sensors

This paper introduces a FBG (fiber Bragg grating) based AE (acoustic emission) sensing system for use in health monitoring of composite wind turbine blades. In this study, a multiplexing high speed FBG sensor system was developed with a spectrometer-type demodulator based on a linear photo detector. Pencil break test was performed using an FBG sensor and the results were compared with the results of piezo-based AE sensor. For the performance test of fracture sensing in composite materials, a down-scaled wind turbine blade was fabricated and drop impact tests were performed. Arrayed 4 FBG sensors were installed in the skin of wind turbine blade and impacts of 15 J energy were applied by a drop weight. The frequency characteristics of impact induced AE signals were examined with short-time Fourier transform focused on the leading waves. Finally, the onset of fractures in composite structure was successfully assessed using arrayed FBG sensors.

Ultrasonic sensor system for the uses in intelligent motion control system of a mobile robots group

2010 ◽  
Vol 7 ◽  
pp. 109-117
Author(s):  
O.V. Darintsev ◽  
A.B. Migranov ◽  
B.S. Yudintsev
Keyword(s):  
Control System ◽  
Mobile Robot ◽  
Mobile Robots ◽  
Motion Control ◽  
High Speed ◽  
Ultrasonic Sensor ◽  
Sensor System ◽  
Motion Control System ◽  
Speed Sensor ◽  
Working Space

The article deals with the development of a high-speed sensor system for a mobile robot, used in conjunction with an intelligent method of planning trajectories in conditions of high dynamism of the working space.

High-speed frequency-swept light source at 1550-nm for Fourier domain OCT with A-scanning rate at 20kHz

2006 ◽  
Author(s):  
R. K. Wang ◽  
S. Cheung ◽  
P. H. Tomlins ◽  
C. Chong ◽  
A. Morosawa ◽  
...  
Keyword(s):  
Light Source ◽  
High Speed ◽  
Fourier Domain ◽  
Scanning Rate ◽  
Fourier Domain Oct

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.

Sign in / Sign up

Export Citation Format

Share Document