Characterization And Calibration Of An Optical Fiber Bandwidth Measurement System For Field Utilization

1983 ◽  
Author(s):  
John D. Chipman ◽  
Ken Prescott
Keyword(s):  
Optical Fiber ◽  
Measurement System ◽  
Bandwidth Measurement

Novel Measurement System With Optical Fiber Sensor for Strain Distributions in Welded Tubular Joints

2008 ◽  
Author(s):  
Hideaki Murayama ◽  
Kazuro Kageyama ◽  
Kohei Ohara ◽  
Kiyoshi Uzawa ◽  
Makoto Kanai ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Spatial Resolution ◽  
Measurement System ◽  
Strain Distribution ◽  
Welded Joint ◽  
Optical Fiber Sensor ◽  
Weld Line ◽  
Fiber Sensor ◽  
Strain Monitoring ◽  
Tubular Joint

Defects and damage in a structural joint can trigger a critical degradation or collapse of the structure. Among joints, welded joints have many uncertainties, such as remaining stress, initial defects, and heat-affected zone. Such uncertainties in a welded joint can also induce a strain fluctuation, when they are subjected to a load. Conversely, the strain fluctuation along the weld line may represent the presence of uncertainties in the welded joint. This means that monitoring strain distribution along the weld line can be good way to assess their integrity and improve reliability of the structure. We have developed a novel distributed strain measurement technique which can measure strain distributions along fiber Bragg gratings (FBG) in an optical fiber and has the high spatial resolution and we applied it to strain monitoring of a welded tubular joint. The spatial resolution o is less than 1 mm and it was confirmed by measurement simulations and experiments. Then, we measured the strain distributions along the weld line of the tubular joint of a steel pipe subjected to a tensile load by the developed measurement system. We could successfully measure the development of the strain distribution along the weld line, where the sharply fluctuating strain distributions resulting from some defects were observed. In this paper, we describe the measurement principle and performance of the optical fiber sensor, and then show the results of strain monitoring in the welded joint.

On-Line Displacement Measurement System Based on Multiplexed Optical Fiber Mach-Zenhder Heterodyne Interferometry

2019 ◽  
Vol 46 (9) ◽  
pp. 0904007
Author(s):  
王韵致 Yunzhi Wang ◽  
谢芳 Fang Xie ◽  
陈龙辉 Longhui Chen ◽  
徐海波 Haibo Xu ◽  
李明佳 Mingjia Li
Keyword(s):  
Optical Fiber ◽  
Measurement System ◽  
Displacement Measurement ◽  
Heterodyne Interferometry ◽  
On Line

scholarly journals Polymer Optical Fiber-Based Respiratory Sensors: Various Designs and Implementations

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
A. Arifin ◽  
Nelly Agustina ◽  
Syamsir Dewang ◽  
Irfan Idris ◽  
Dahlang Tahir
Keyword(s):  
Optical Fiber ◽  
Measurement System ◽  
Output Voltage ◽  
Low Cost ◽  
Optical Fiber Sensor ◽  
Digital Signal ◽  
Analog Signal ◽  
Fiber Sensor ◽  
Polymer Optical Fiber ◽  
Arduino Uno

This research discusses the polymer optical fiber sensor for respiratory measurements. The infrared LED that produces light will propagate along the polymer optical fiber which will be received by the phototransistor and the differential amplifier. The output voltage in the form of an analog signal will be converted to a digital signal by the Arduino Uno microcontroller and displayed on the computer. The polymer optical fiber sensor is installed on the corset using a variety of configuration (straight, sinusoidal, and spiral), placed in the abdomen, and a variety of positions (abdomen, chest, and back) using only a spiral configuration. While doing the inspiration, the stomach will be enlarged so that the optical fiber sensor will have strain. The strain will cause loss of power, the resulting light intensities received by the phototransistor are reduced, and the output voltage on the computer decreases. The result shows that the highest voltage amplitudes were in the spiral configuration placed in the abdominal position for slow respiration measurements with the highest range, sensitivity, and resolution which are 0.119 V, 0.238 V/s, and 0.004 s, respectively. The advantages of our work are emphasized on measurement system simplicity, low cost, easy fabrication, and handy operation and can be connected with the Arduino Uno microcontroller and computer.

Development of measurement system for microstructures using an optical fiber probe: improvement of measurable region and depth

2020 ◽  
Vol 31 (7) ◽  
pp. 075902 ◽  
Author(s):  
Hiroshi Murakami ◽  
Akio Katsuki ◽  
Takao Sajima ◽  
Kosuke Uchiyama ◽  
Ichiro Yoshida ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Measurement System ◽  
Fiber Probe ◽  
Optical Fiber Probe

Novel bandwidth measurement system for short‐fiber lengths

1981 ◽  
Vol 52 (11) ◽  
pp. 1660-1663 ◽  
Author(s):  
H. M. Presby ◽  
D. Marcuse ◽  
G. Bodeep
Keyword(s):  
Measurement System ◽  
Short Fiber ◽  
Bandwidth Measurement

Research of DC Current Measurement Technology Based on Optical Fiber Thermometry

2011 ◽  
Vol 128-129 ◽  
pp. 686-689 ◽  
Author(s):  
Dan Ping Jia ◽  
Yang Wang ◽  
Song Lin ◽  
Quan Kang Wei
Keyword(s):  
Thin Film ◽  
Optical Fiber ◽  
Measurement System ◽  
Low Voltage ◽  
Low Cost ◽  
Electric Heating ◽  
Measurement Technology ◽  
Voltage Measurement ◽  
Film Sensor ◽  
Dc Current

Thin film sensor has the advantages of small size and low cost, which has become a research hotspot in recent years. A measurement system of passive optical fiber DC current sensor based on the thin film sensors is designed in this article. Designs of electric-heating converter, heating-light converter and low-voltage measurement display system are introduced in detail. Experimental results indicate that the general linear correlation between the time constant of fluorescent lifetime and the voltage across the thin film resistor. The feasibility of measurement system is verified via the results of the experiment.

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