Abstract
A novel zeolite-coated fiber sensors for detection of volatile organic compounds (VOCs) based on the Fabry-Perot interferometer was proposed and demonstrated. The sensor comprised a polycrystalline silicalite thin film grown up on the cleaved end face of a standard single-mode fiber. The inline Fabry-Perot cavity was composed by the end face of the single-mode fiber and the thin film. The sensor device operated by measuring the interference signal, which was a function of the amount of chemical vapor adsorption in its crystalline micro porous structure. Experimental results showed that the proposed VOC sensor worked well and the sensitivities were 2.78×10−3 dB/ppm when the concentration ranged from 350 ppm to 2100 ppm and 1.23×10−3 dB/ppm when the concentration ranged from 2100 ppm to 5250 ppm.
Highlights
The detection of volatile organic compounds (VOCs) has been found useful in many areas including environmental pollutant monitoring, food quality assurance, and emission control [1]
Experimental results showed that the proposed sensor for chemical vapor measurement worked well and the sensitivities of the isopropanol concentration were 2.78×10–3 dB/ppm when the concentration ranged from 350 ppm to 2100 ppm and 1.23×10–3 dB/ppm when the concentration ranged from 2100 ppm to 5250 ppm
The sensor was made by growing the thin silicalite film on the cleaved end face of a standard single-mode fiber by in situ crystallization from an aluminum-free precursor solution using tetrapropylammonium ion (TPA+) as the structure directing agent (SDA)
Summary
The detection of volatile organic compounds (VOCs) has been found useful in many areas including environmental pollutant monitoring, food quality assurance, and emission control [1]. The sensors based on optical fibers have been attracting increasing interest due to their advantages such as the small size, remote measurement, and immunity to electromagnetic interference. The F-P cavity can be constituted by a section of the fiber between two dielectric mirrors [2] or a gap between two dielectric end surfaces [3]. An interferometer signal which is formed by two reflections at two end surfaces is a function of the length and refractive index of the cavity. A fiber F-P sensor is capable of measuring various parameters which are resulted from environmental changes. Because of the high sensitivity and quick response time, the fiber F-P sensors are attractive for applications involving pressure and temperature measurement [4]
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