Light Diffusing Optical Fiber Sensor for Distributed Optical Absorption Spectroscopy and Chemical Sensing

An optical fiber sensor system for distributed optical absorption spectroscopy based on light diffusing optical fiber is proposed and evaluated. The sensor is composed by two light-diffusing glass fibers radiatively coupled. The light from a pulsed laser diode (PLD) propagates along the first fiber...

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Bibliographic Details
Published in:IEEE sensors journal 2023-02, Vol.23 (3), p.2176-2183
Main Authors: Persichetti, Gianluca, Testa, Genni, Imperatore, Pasquale, Bernini, Romeo
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Distributed sensors
Evaluation
fiber-optic sensors
Glass fibers
light diffusing fiber (LDF)
Optical fiber polarization
Optical fiber sensors
Optical fibers
Optical properties
Optical pulses
optical spectroscopy
Optical variables measurement
Pulsed lasers
Robot sensing systems
Semiconductor lasers
Sensors
Spatial resolution
Spectrum analysis
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Summary:An optical fiber sensor system for distributed optical absorption spectroscopy based on light diffusing optical fiber is proposed and evaluated. The sensor is composed by two light-diffusing glass fibers radiatively coupled. The light from a pulsed laser diode (PLD) propagates along the first fiber and is locally diffused out into the medium between the fibers. The light transmitted by the medium is partially collected by the second fiber and detected at the end of the fiber by an optical time-domain reflectometry (OTDR) detection scheme. The system permits distributed measurements of the optical absorption properties of the sample medium between the fibers. The experimental results confirm the possibility of distributed measurements with a spatial resolution of about 17 cm over 4 m of measurement range. Distributed chemical sensing has also been evaluated by measuring the absorption of water solutions containing copper ions. A limit of detection (LOD) of 710 ppm has been achieved.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2022.3229133