First Field Trial of Monitoring Vehicle Traffic on Multiple Routes by Using Photonic Switch and Distributed Fiber Optics Sensing System on Standard Telecom Networks

2021 ◽  
Author(s):  
Glenn A Wellbrock ◽  
Tiejun J Xia ◽  
Ming-Fang Huang ◽  
Milad Salemi ◽  
Yuheng Chen ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Field Trial ◽  
Vehicle Traffic ◽  
Sensing System ◽  
Photonic Switch ◽  
Multiple Routes ◽  
Telecom Networks

A Novel Multi-Point Fiber Optics Acetylene Sensing System Based on Dense Wavelength Division Multiplexers

2011 ◽  
Vol 31 (5) ◽  
pp. 0506003 ◽  
Author(s):  
余贶琭 Yu Kuanglu ◽  
吴重庆 Wu Chongqing ◽  
郭旋 Guo Xuan ◽  
王智 Wang Zhi ◽  
石梅荣 Shi Meirong ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Wavelength Division ◽  
Sensing System

Detection of Crack Travel and Opening of a Standard Notched Specimen Mode I Using Embedded FOS Device

2013 ◽  
Vol 442 ◽  
pp. 360-366 ◽  
Author(s):  
F.E. Utou ◽  
J. Gryzagoridis ◽  
B. Sun
Keyword(s):  
Optical Fiber ◽  
Light Beam ◽  
Fiber Optics ◽  
Optical Fibers ◽  
Crack Detection ◽  
Crack Opening ◽  
Engineering Structures ◽  
Notched Specimen ◽  
Sensing System ◽  
Total Failure

Crack detection and monitoring has become one of a focus center for the health monitoring of engineering structures under the influence of mechanical deformation.This paper discusses the detecting, tracking and monitoring mechanisms for the crack, by initiating a sensing system by using a standard notched specimen. Crack features such as magnitude of crack travel versus crack opening are displacement indicators that can vary due to the applied load on the normal line to the direction of the crack travel. More ever, the rate of the crack opening is considered to be proportional to the rate of the crack travel.Lines of three optical fibers of 125 nm are embedded and fixed at two ends and pass across the direction of the crack travel at an approximation of 2mm apart. The light of 2V from the source is passed through the optical fiber, across the crack tip. The crack opening forces the optical fiber to extend under tension, and hence the interruption of its diameter. This causes the decrease in the light intensity traveling through the fiber till the total failure of the fiber, to declare presence of crack. The embedded fiber optics on the specimen links the instrumentation optical system which permits the light beam throughput. Finally the converted light beam into voltage domain allowed us to closely analyze the crack tendency, and eventually be able to establish a model and sensor equation which governs the trend of the crack growth.

Designing high-resolution slow scan CCD-based TEM camera systems

1992 ◽  
Vol 50 (2) ◽  
pp. 946-947
Author(s):  
James F. Mancuso ◽  
William B. Maxwell ◽  
Russell E. Camp ◽  
Mark H. Ellisman
Keyword(s):  
Fiber Optics ◽  
Ccd Camera ◽  
High Energy ◽  
Phosphor Layer ◽  
X Ray ◽  
Light Production ◽  
Camera Systems ◽  
X Ray Imaging ◽  
Electron Image ◽  
Scintillating Fiber

The imaging requirements for 1000 line CCD camera systems include resolution, sensitivity, and field of view. In electronic camera systems these characteristics are determined primarily by the performance of the electro-optic interface. This component converts the electron image into a light image which is ultimately received by a camera sensor.Light production in the interface occurs when high energy electrons strike a phosphor or scintillator. Resolution is limited by electron scattering and absorption. For a constant resolution, more energy deposition occurs in denser phosphors (Figure 1). In this respect, high density x-ray phosphors such as Gd2O2S are better than ZnS based cathode ray tube phosphors. Scintillating fiber optics can be used instead of a discrete phosphor layer. The resolution of scintillating fiber optics that are used in x-ray imaging exceed 20 1p/mm and can be made very large. An example of a digital TEM image using a scintillating fiber optic plate is shown in Figure 2.

Jet Lag In Military Operations: Field Trial Of L-Tryptophan In Reducing Sleep-Loss Effects

1986 ◽  
Author(s):  
Cheryl L. Spinweber ◽  
Schuyler C. Webb ◽  
Christian Gillin
Keyword(s):  
Field Trial ◽  
Sleep Loss ◽  
Jet Lag ◽  
Military Operations
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