Study of TNT Sensor Based on Fluorescence Quenching of Conjugated Polymer MEH-PPV

2011 ◽  
Vol 58-60 ◽  
pp. 2688-2692
Author(s):  
Feng Hong Chu ◽  
Lei Ye ◽  
Jian Qiang Zhang ◽  
Ben Shang Yang ◽  
Mian Zhao ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Optical Fiber ◽  
Light Source ◽  
Fluorescence Intensity ◽  
Linear Relation ◽  
Conjugated Polymer ◽  
Plastic Optical Fiber ◽  
Light Emitting ◽  
Sensor Head ◽  
The Relationship

A nitro aromatic explosives sensor based on fluorescence quenching was studied in this paper. U-shaped plastic optical fiber was used as sensor head and light emitting conjugated polymer MEH-PPV as fluorescence indictor. The light source was modulated sinusoidal to eliminate the external light disturbance. TNT quenching characteristics of fluorescence intensity were measured; When TNT concentration was lower than 10mg/ml, the relationship between fluorescence intensity and TNT concentration was linearly, when TNT concentration was higher than 10mg/100ml the obtained characteristics showed deviation from linear relation described by Stern-Volmer equation.

Lensed Plastic Optical Fiber with a Convexo-Concave Fiber Endface for Coupling Laser Diodes With Plastic Optical Fiber

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Yih-Tun Tseng ◽  
Shu-Ming Chang ◽  
Sheng-He Huang ◽  
Wood-Hi Cheng
Keyword(s):  
Optical Fiber ◽  
Light Source ◽  
Optical Fibers ◽  
Transmission Rate ◽  
Coupling Efficiency ◽  
Small Diameter ◽  
Plastic Optical Fiber ◽  
Graded Index ◽  
Coupling Laser ◽  
Working Distance

This work presents a novel lensed plastic optical fiber (POF), efficiently coupled with a light source. A convexo-concave plastic lens (CCPL) was bound to a flat-end plastic optical fiber using laser transmission welding (LTW) to form a convexo-concave-shaped fiber endface (CCSFE). The novel lensed plastic optical fiber has a longer working distance and a higher coupling efficiency than conventional lensed plastic optical fibers. 850 nm fiber is often used in high-power 2.5 Gb/s transmission rate. Experimental POF is perfluorinated POF, 62.5–500 μm diameter, 850∼1300 μm wavelength, 10 dB/km power loss rate, 2.5 Gb/s transmission rate. Because of the small diameter of POF, it is difficult to couple between the light source and POF. Therefore, it is important to develop a lensed fiber structure to increase the coupling efficiency. Experiments indicate that the coupling efficiency between a laser diode at a wavelength of 850 nm and a graded-index POF is as high as 85% with a long working distance of 250 μm. The measured tolerance, in relation to the lateral and vertical displacements and tilt, are satisfactory for practical active alignment.

High-Performance 650 nm Resonant-Cavity Light-Emitting Diodes for Plastic Optical-Fiber Application

2007 ◽  
Vol 46 (4B) ◽  
pp. 2450-2453 ◽  
Author(s):  
Yea-Chen Lee ◽  
Chia-En Lee ◽  
Bo-Siao Cheng ◽  
Tien-Chang Lu ◽  
Hao-Chung Kuo ◽  
...  
Keyword(s):  
Optical Fiber ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Resonant Cavity ◽  
Plastic Optical Fiber ◽  
Light Emitting

High Performances of 650 nm Resonant Cavity Light Emitting Diodes for Plastic Optical Fiber Applications

2006 ◽  
Author(s):  
Yea-Chen Lee ◽  
Chia-En Lee ◽  
Shu-Woei Chiou ◽  
Hao-Chung Kuo ◽  
Tien Chang Lu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Light Emitting Diodes ◽  
Resonant Cavity ◽  
Plastic Optical Fiber ◽  
Light Emitting ◽  
Optical Fiber Applications

scholarly journals Study of Macrobending Losses Effect in Plastic Optical Fibber.

2016 ◽  
Vol 4 (01) ◽  
pp. 43
Author(s):  
Egyn Furqon Ghozali ◽  
Mohtar Yunianto ◽  
Nuryani N
Keyword(s):  
Experimental Study ◽  
Light Intensity ◽  
Optical Fiber ◽  
Light Source ◽  
Optical Fibers ◽  
Personal Computer ◽  
Plastic Optical Fiber ◽  
Model Based

<span>Experimental study to analyze the effect of macrobending losses in plastic optical fiber triple bending <span>model based on PC (personal computer) has been conducted. The data is gathered by measuring the <span>change of the light intensity due to the presence of bending on optical fibers. The bending causes losses <span>of optical fiber that is read by WIM (weight in motion) Acquisition program based on Borlan Delphi 7. <span>The optical fibers are plastic with diameter of 3 mm. The diameter of pin is 8 mm and the space between <span>the pin is 5 mm. The light source is a LED (<span><em>λ</em><span>=676 nm). As a result, the losses of optical fiber increase <span>with the enhancement of bending. The increase trend linear to sensitivity of the sensor with gradient of <span>0,1063 and <span><em>R</em><span>2 <span>of 0,9626. Therefore, the proposed design might be applied as a WIM sensor.</span></span></span></span></span></span></span><br /></span></span></span></span></span></span>

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