Multiplexed fibre-optic interferometric sensing system: combined frequency and time division

1988 ◽  
Vol 24 (7) ◽  
pp. 409 ◽  
Author(s):  
F. Farahi ◽  
J.D.C. Jones ◽  
D.A. Jackson
Keyword(s):  
Fibre Optic ◽  
Sensing System ◽  
Time Division

Coherence multiplexing of remote fibre optic fabry-perot sensing system

1988 ◽  
Vol 65 (5) ◽  
pp. 319-321 ◽  
Author(s):  
F. Farahi ◽  
T.P. Newson ◽  
J.D.C. Jones ◽  
D.A. Jackson
Keyword(s):  
Fibre Optic ◽  
Sensing System ◽  
Fabry Perot ◽  
Coherence Multiplexing

Keynote: Integrated Distributed Fibre Optic Sensing System for Reservoir and Subsidence Monitoring

2021 ◽  
Author(s):  
M. Farhadiroushan ◽  
T. Parker ◽  
S. Shatalin ◽  
A. Gillies ◽  
Z. Chen ◽  
...  
Keyword(s):  
Fibre Optic ◽  
Sensing System ◽  
Subsidence Monitoring

Online sensing of volatile organic compounds in groundwater using mid-infrared fibre optic evanescent wave spectroscopy: a pilot scale test

2003 ◽  
Vol 47 (2) ◽  
pp. 121-126 ◽  
Author(s):  
H. Steiner ◽  
K. Staubmann ◽  
R. Allabashi ◽  
N. Fleischmann ◽  
A. Katzir ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Pilot Plant ◽  
Pilot Scale ◽  
In Situ Monitoring ◽  
Fibre Optic ◽  
Sensor Head ◽  
Sensing System ◽  
Volatile Organic

A prototype sensing system for in-situ monitoring of volatile organic compounds in contaminated groundwater was tested at a pilot scale plant. The sensor consists of a commercially available Fourier transform infrared spectrometer, connected to a 6 m long infrared transparent silver halide fibre optic cable. A 10 cm long core-only section at the centre of the fibre is mounted on a sensor head and coated with a hydrophobic polymer layer, while the remaining fibre is protected by Teflon tubing and thus not in contact with the surrounding media. The sensor head was immersed into the monitoring wells of the pilot plant testing the sensor system under circumstances close to field conditions and typical for in-situ measurements. The pilot plant consists of a 1 m3 cubic tank filled with gravel. A pump is used to circulate water horizontally through the tank, simulating a natural aquifer. The evolution of the concentration of analytes injected into the system is monitored with time using the developed prototype sensing system. The results are validated by corresponding sampling and analysis with headspace gas chromatography.

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