Efficient miniature fiber-optic tunable filter based on intracore Bragg grating and electrically resistive coating

1998 ◽  
Vol 10 (3) ◽  
pp. 361-363 ◽  
Author(s):  
H.G. Limberger ◽  
Nguyen Hong Ky ◽  
D.M. Costantini ◽  
R.P. Salathe ◽  
C.A.P. Muller ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Tunable Filter ◽  
Bragg Grating ◽  
Resistive Coating

Dryer Effluent Monitoring in a Chemical Pilot Plant via Fiber-Optic Near-Infrared Spectroscopy

1998 ◽  
Vol 52 (5) ◽  
pp. 717-724 ◽  
Author(s):  
Charity Coffey ◽  
Alex Predoehl ◽  
Dwight S. Walker
Keyword(s):  
Real Time ◽  
Pilot Plant ◽  
Near Infrared ◽  
Fiber Optic ◽  
Tunable Filter ◽  
Calibration Model ◽  
Gas Cell ◽  
Rotary Dryer ◽  
Vapor Stream ◽  
Effluent Stream

The monitoring of the effluent of a rotary dryer has been developed and implemented. The vapor stream between the dryer and the vacuum is monitored in real time by a process fiber-optic coupled near-infrared (NIR) spectrometer. A partial least-squares (PLS) calibration model was developed on the basis of solvents typically used in a chemical pilot plant and uploaded to an acousto-optic tunable filter NIR (AOTF-NIR). The AOTF-NIR is well suited to process monitoring as it electrically scans a crystal and hence has no moving parts. The AOTF-NIR continuously fits the PLS model to the currently collected spectrum. The returned values can be used to follow the drying process and determine when the material can be unloaded from the dryer. The effluent stream was monitored by placing a gas cell in-line with the vapor stream. The gas cell is fiber-optic coupled to a NIR instrument located 20 m away. The results indicate that the percent vapor in the effluent stream can be monitored in real time and thus be used to determine when the product is free of solvent.

Surveillance of fiber optic and electric power cables using fiber Bragg grating sensors

1999 ◽  
Author(s):  
Francisco M. Araujo ◽  
M. Teixeira ◽  
Luis A. A. Ferreira ◽  
Ireneu M. Dias ◽  
A. Quintela ◽  
...  
Keyword(s):  
Electric Power ◽  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Bragg Grating ◽  
Power Cables ◽  
Fiber Bragg Grating Sensors ◽  
Electric Power Cables

Cognitive fiber Bragg grating sensors system based on fiber Fabry-Perot tunable filter technology

2011 ◽  
Author(s):  
Hongtao Zhang ◽  
Pengfei Wang ◽  
Jilin Zou ◽  
Jing Xie ◽  
Hong-Liang Cui
Keyword(s):  
Fiber Bragg Grating ◽  
Tunable Filter ◽  
Bragg Grating ◽  
Fiber Bragg Grating Sensors ◽  
Fabry Perot

scholarly journals Bragg Grating-Based Fiber-Optic Laser Probe for Temperature Sensing

2004 ◽  
Vol 16 (1) ◽  
pp. 218-220 ◽  
Author(s):  
J. Mandal ◽  
S. Pal ◽  
T. Sun ◽  
K.T.V. Grattan ◽  
A.T. Augousti ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Temperature Sensing ◽  
Bragg Grating ◽  
Laser Probe

scholarly journals Fiber Optic Fabry-Perot Current Sensor Integrated with Magnetic Fluid Using a Fiber Bragg Grating Demodulation

Sensors ◽  
2015 ◽  
Vol 15 (7) ◽  
pp. 16632-16641 ◽  
Author(s):  
Ji Xia ◽  
Qi Wang ◽  
Xu Liu ◽  
Hong Luo
Keyword(s):  
Fiber Bragg Grating ◽  
Magnetic Fluid ◽  
Fiber Optic ◽  
Current Sensor ◽  
Bragg Grating ◽  
Fabry Perot
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