Strain measurement inside a strong pulsed magnet based on embedded fiber Bragg gratings

2012 ◽  
Author(s):  
Qian Zhang ◽  
Dongsheng Zhang ◽  
Jieyan Li ◽  
Biao Shui ◽  
Yongxing Guo
Keyword(s):  
Strain Measurement ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Pulsed Magnet

In-situ strain measurement of ballistic fabrics during impact using fiber Bragg gratings

2020 ◽  
Vol 59 ◽  
pp. 102334
Author(s):  
D.A. Hackney ◽  
T. Goode ◽  
F. Seng ◽  
S. Schultz ◽  
M. Pankow ◽  
...  
Keyword(s):  
Strain Measurement ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
In Situ Strain Measurement

scholarly journals High Speed, Localized Multi-Point Strain Measurements on a Containment Vessel at 1.7 MHz Using Swept-Wavelength Laser-Interrogated Fiber Bragg Gratings

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5935
Author(s):  
Steve Gilbertson ◽  
Mark Pickrell ◽  
Dario Castano ◽  
Gary Salazar ◽  
Tom Beery ◽  
...  
Keyword(s):  
Strain Measurement ◽  
High Speed ◽  
High Explosive ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Laser Source ◽  
Global Changes ◽  
Element Analysis ◽  
All Optical ◽  
Explosive Detonation

Dynamic elastic strain in ~1.8 and 1.0 m diameter containment vessels containing a high explosive detonation was measured using an array of fiber Bragg gratings. The all-optical method, called real-time localized strain measurement, recorded the strain for 10 ms after detonation with additional measurements being sequentially made at a rate of 1.7 MHz. A swept wavelength laser source provided the repetition rate necessary for such high-speed measurements while also providing enough signal strength and bandwidth to simultaneously measure 8 or more unique points on the vessel’s surface. The data presented here arethen compared with additional diagnostics consisting of a fast spectral interferometer and an optical backscatter reflectometer to show a comparison between the local and global changes in the vessel strain, both dynamically and statically to further characterize the performance of the localized strain measurement. The results are also compared with electrical resistive strain gauges and finite element analysis simulations.

Interferometric temperature-insensitive strain measurement with different-diameter fiber Bragg gratings

1997 ◽  
Vol 22 (11) ◽  
pp. 790 ◽  
Author(s):  
Minho Song ◽  
Byoungho Lee ◽  
Sang Bae Lee ◽  
Sang Sam Choi
Keyword(s):  
Strain Measurement ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings

scholarly journals Design and Analysis of a Combined Strain–Vibration–Temperature Sensor with Two Fiber Bragg Gratings and a Trapezoidal Beam

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3571 ◽  
Author(s):  
Kun Yao ◽  
Qijing Lin ◽  
Zhuangde Jiang ◽  
Na Zhao ◽  
Gang-Ding Peng ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Strain Measurement ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
The Other ◽  
Vibration Measurement ◽  
Main Beam ◽  
Nonlinearity Error ◽  
Individual Strain ◽  
Combined Sensor

A combined sensor to simultaneously measure strain, vibration, and temperature has been developed. The sensor is composed of two Fiber Bragg gratings (FBGs) and a vibration gainer. One FBG is used to measure strain, while the other measures vibration and temperature. The gainer has a mass block which is used to increase its sensitivity to vibration. The main beam of the vibration gainer was designed as a trapezoid in order to reduce the strain gradient while sensing vibration. In addition, an interrogation method was used to eliminate interactions between measured parameters. Experiments were carried out to analyze the performance of the proposed sensor. For individual strain measurement in the range of 0–152 με, the sensitivity and nonlinearity error were 1.878 pm/με and 2.43% Full Scale (F.S.), respectively. For individual temperature measurement in the range of 50–210 °C, the sensitivity and nonlinearity error were 29.324 pm/°C and 1.88% F.S., respectively. The proposed sensor also demonstrated a sensitivity of 0.769 pm/m·s−2 and nonlinearity error of 1.83% F.S. for vibration measurement in the range of 10–55 m/s2. Finally, simultaneously measuring strain, temperature, and vibration resulted in nonlinearity errors of 4.23% F.S., 1.89% F.S., and 2.23% F.S., respectively.

scholarly journals Strain Measurement Validation of Embedded Fiber Bragg Gratings

2010 ◽  
Vol 4 (1) ◽  
pp. 22-33 ◽  
Author(s):  
Michael C. Emmons ◽  
Sunny Karnani ◽  
Stefano Trono ◽  
Kotekar P. Mohanchandra ◽  
W. Lance Richards ◽  
...  
Keyword(s):  
Strain Measurement ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Measurement Validation
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