Interferometric signals in fiber optic methane sensors with wavelength modulation of the DFB laser source

1998 ◽  
Vol 16 (1) ◽  
pp. 43-53 ◽  
Author(s):  
G. Stewart ◽  
A. Mencaglia ◽  
W. Philp ◽  
Wei Jin
Keyword(s):  
Fiber Optic ◽  
Laser Source ◽  
Wavelength Modulation ◽  
Dfb Laser

Noise investigation and signal processing in fiber optic gas sensor with wavelength modulation of the DFB laser diode

2012 ◽  
Author(s):  
Jun Chang ◽  
Qingjie Huang ◽  
Xiangzhi Liu ◽  
Kun Chen ◽  
Hengtai Chang ◽  
...  
Keyword(s):  
Signal Processing ◽  
Gas Sensor ◽  
Laser Diode ◽  
Fiber Optic ◽  
Wavelength Modulation ◽  
Dfb Laser

Compact green laser source using butt-coupling between multi-section DFB-laser and SHG waveguide crystal

2008 ◽  
Vol 44 (25) ◽  
pp. 1463 ◽  
Author(s):  
J. Wiedmann ◽  
O. Brox ◽  
T. Tekin ◽  
F. Scholz ◽  
T. Büttner ◽  
...  
Keyword(s):  
Green Laser ◽  
Laser Source ◽  
Dfb Laser ◽  
Butt Coupling

Construction and Evaluation of the Fiber-Optic Sensor System for Chemical Vapor Detection

2008 ◽  
Vol 55-57 ◽  
pp. 509-512 ◽  
Author(s):  
M. Kittidechachan ◽  
I. Sripichai ◽  
W. Supakum ◽  
S. Thuamthai ◽  
Suppalak Angkaew ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
Chemical Vapor ◽  
Fiber Optic Sensor ◽  
Sensor System ◽  
Laser Source ◽  
Vapor Concentration ◽  
Vapor Detection ◽  
Optic Sensor ◽  
Butyl Amine

The fiber optic sensor system for chemical vapor detection was desiged and constructed. The system consisted of three parts; the optic unit, the fiber-optic sensing head and the flow controlling unit. The optic unit included a He-Ne laser source which lazes a red laser into an aligned optical fiber, a photo detector, and a signal processing with computer interface controlled by the Labview® program version 7.1. The sensing head was made of a polyaniline thin film coated onto the de-cladded section of an optical fiber covered by a gas mixing cell. The concentration of measured gas was controlled by varying nitrogen gas flow rate. The nitrogen flow controller was set-up to obtain vapor concentration in the range of 0.04 to 0.40 % v/v. Vapors of hydrochloric acid (HCl) and n-butyl amine (a weak base) were used to test the performance of the sensor system. It was found that output intensity increases with an increasing HCl concentration and decreases with increasing n-butyl amine concentration. The response toward the amine vapor was faster than that of the HCl vapor (23 seconds for n-butyl amine and 72 seconds for HCl). Experiments performed at various concentrations of amine vapor (between 0.04 to 0.21 %v/v) found that a higher concentration yields faster response time.

Complex-coupled wavelength-selectable dfb laser source for coarse WDM

2008 ◽  
Author(s):  
Hong-yun Xie ◽  
Jia Li ◽  
Jun-ning Gan ◽  
Pei Shen ◽  
Yi-wen Huang ◽  
...  
Keyword(s):  
Laser Source ◽  
Dfb Laser

A novel tunable all-optical incoherent negative-tap fiber-optic transversal filter based on a DFB laser diode and fiber Bragg gratings

2000 ◽  
Vol 12 (9) ◽  
pp. 1207-1209 ◽  
Author(s):  
Shenping Li ◽  
K.S. Chiang ◽  
A. Gambling ◽  
Y. Liu ◽  
L. Zhang ◽  
...  
Keyword(s):  
Laser Diode ◽  
Fiber Optic ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Transversal Filter ◽  
All Optical ◽  
Dfb Laser
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