Abstract
In this paper, different core structures of microstructured optical fibers (MOFs) for low-finesse Fabry–Pérot (FP) sensors are experimentally compared to get the highest sensitivity. These devices are designed for volatile organic compounds (VOCs) measurements. Indium tin oxide (ITO) thin films were deposited by sputtering on the MOFs and different optical fast Fourier transform (FFT) phase responses from the FP were measured for saturated atmospheres of ethanol. It has been demonstrated that the sensitivities of the developed sensors depend strongly on the geometry and the dimensions of the MOF-cores. The sensors show recovery times shorter than 100 s and the baselines are fully recovered after every exposure to ethanol vapors.
Highlights
Nowadays, the development of sensors based on fiber optics is experiencing considerable growth due to the relevance of the different applications where they are involved [1,2,3]
In order to obtain the same thickness for everyofsensor, sputtering was to improve the sensitivity of the microstructured optical fibers (MOFs) sensors only by means of its structures; the effect of other technique was selected
In this paper,different different optical optical sensing heads based on microstructured optical fibers (MOFs)
Summary
The development of sensors based on fiber optics is experiencing considerable growth due to the relevance of the different applications where they are involved [1,2,3] Another important factor in this growth is the advantages that optical fiber sensors offer over other kinds of sensors (for example, electronic sensors): small size, light weight, low cost, multiplexing or distributed measurements, remote monitoring, immunity to electromagnetic field interference, or no electrical biasing are some of them [4,5]. The existence of air holes gives the possibility of light propagation in air, or alternatively provides the ability to insert liquids or gases into the air holes For these reasons, MOFs exhibit improved characteristics over conventional optical fibers and great potential for sensing applications [8]
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