An efficient and fast detection algorithm for multimode FBG sensing

Ganziy, Denis; Jespersen, O.; Rose, Bjarke; Bang, Ole

doi:10.1117/12.2194305

Cited by 2 publications

(1 citation statement)

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“…However, the more indistinct characteristic of the TE-polarization caused reflection peaks combined with the applied peak detection algorithm led to complications in monitoring the respective wavelength shifts. This could be overcome by performing discrete records of the reflection spectra and a subsequent application of a more sufficient peak detection algorithm [51]. As compared to a non-functionalized PBG-sensor, the cyclodextrin sensitized Bragg grating sensor is found to exhibit an up to 400-fold wavelength shift (TE-polarization caused signal of the CyD2-functionalized sensor) and accordingly proves the excellent suitability of the cyclodextrin derivatives as affinity materials for the chemical sensing of CFC-11.…”

Section: Resultsmentioning

confidence: 99%

Optical Sensor for Real-Time Detection of Trichlorofluoromethane

Girschikofsky

Ryvlin

Waldvogel

et al. 2019

Sensors

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Trichlorofluoromethane was once a promising and versatile applicable chlorofluorocarbon. Unaware of its ozone-depleting character, for a long time it was globally applied as propellant and refrigerant and thus led to significant thinning of the ozone layer and contributed to the formation of the so-called ozone hole. Although production and application of this substance were gradually reduced at an early stage, we still face the consequences of its former careless use. Today, trichlorofluoromethane is released during recycling processes of waste cooling devices, traded on the black market, and according to recent findings still illegally manufactured. Here, we present an optical sensor device for real-time in-situ detection and measurement of this environmentally harmful chlorofluorocarbon. The described sensor is based on a planar Bragg grating that is functionalized with cyclodextrin derivatives and operates on the principle of a chemical sensor. In our study, the sensor is sensitized using per-methyl-, per-ethyl-, and per-allyl-substituted α -, β -, and γ -cyclodextrins as affinity materials for airborne trichlorofluoromethane. These functional coatings have been proven to be highly efficient, as an up to 400-times stronger signal deflection could be achieved compared to an identical but uncoated sensor. The presented sensor device shows instantaneous response to trichlorofluoromethane exposure, and features a limit-of-detection of less than 25 ppm, depending on the applied affinity material.

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Section: Resultsmentioning

confidence: 99%