Journal
SENSORS
Volume 12, Issue 2, Pages 2018-2025Publisher
MDPI
DOI: 10.3390/s120202018
Keywords
gas detection; optical sensor; Bragg grating; cyclodextrin; aromatic hydrocarbons
Funding
- BMBF [FKZ 17031X10]
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We report an optical refractive index sensor system based on a planar Bragg grating which is functionalized by substituted gamma-cyclodextrin to determine low concentrations of naphthalene in solvent vapor. The sensor system exhibits a quasi-instantaneous shift of the Bragg wavelength and is therefore capable for online detection. The overall shift of the Bragg wavelength reveals a linear relationship to the analyte concentration with a gradient of 12.5 +/- 1.5 pm/ppm. Due to the spectral resolution and repeatability of the interrogation system, this corresponds to acquisition steps of 80 ppb. Taking into account the experimentally detected signal noise a minimum detection limit of 0.48 +/- 0.05 ppm is deduced.
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