Mid-IR optical sensor for CO2 detection based on fluorescence absorbance of Dy3+:Ga5Ge20Sb10S65 fibers

•Optical CO2 detection.•Rare earth doped chalcogenide fibers.•Dy:glass sulfide spectroscopy.•Mid-IR amplified spontaneous emission (ASE) sources.•Field operating sensor. The Dy3+ doped Ga5Ge20Sb10S65 bulk glass provides good emission efficiency in the middle infrared with a better brightness than th...

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Published in:Sensors and actuators. A. Physical. 2015-02, Vol.207 (PartA), p.518-525
Main Authors: Starecki, Florent, Charpentier, Fréderic, Doualan, Jean-Louis, Quetel, Lionel, Michel, Karine, Chahal, Radwan, Troles, Johann, Bureau, Bruno, Braud, Alain, Camy, Patrice, Moizan, Virginie, Nazabal, Virginie
Format: Article
Language:English
Subjects:
Atmospherics
Carbon dioxide
Chalcogenide fibers
Chalcogenide glass
Chemical Sciences
CO2 detection
Dysprosium
Emission
Fluorescence
Laser diodes
Material chemistry
Mid-IR optical sensor
Optical fibers
Optical sensors
Rare earth
Sulfides
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Summary:•Optical CO2 detection.•Rare earth doped chalcogenide fibers.•Dy:glass sulfide spectroscopy.•Mid-IR amplified spontaneous emission (ASE) sources.•Field operating sensor. The Dy3+ doped Ga5Ge20Sb10S65 bulk glass provides good emission efficiency in the middle infrared with a better brightness than the blackbody sources. Sulfide single index fibers doped with Dy3+ (500–3000ppm) were drawn with optical attenuation of about 1–3dB/m, suitable to develop fluorescence sources for chemical analysis by optical absorption in middle infrared. They particularly present a broad emission around 4–5μm, making them attractive for CO2 detection. Considering the low cost and efficient Dy3+ pumping scheme by means of a commercial laser diode, the Dy3+ sulfide fiber reveals potential for developing a CO2 optical sensor. Using the 4.35μm broad emission of a Dy3+ doped Ga5Ge20Sb10S65 fiber combined with a differential measurement technique, the CO2 gas concentration measurement was carried out fruitfully. For this specific application, the CO2 detection threshold was fixed at about 400ppm corresponding to atmospheric concentration and was successfully reached for a cell length of 1.5cm with a resolution of about 5%. The sensitivity of the setup is mainly related to the size of the cell, deliberately reduced to develop a robust and compact system for natural geological sites.
ISSN:0925-4005
0924-4247
1873-3077
1873-3069
DOI:10.1016/j.snb.2014.10.011