Abstract
A fiber optic chlorine gas sensor working on surface plasmon resonance (SPR) technique fabricated using coatings of silver and zinc oxide films over unclad core of the optical fiber is reported. The sensor probe is characterized using wavelength interrogation and recording SPR spectra for different concentrations of chlorine gas around the probe. A red shift is observed in the resonance wavelength on increasing the concentration of the chlorine gas. The thickness of the zinc oxide film is optimized to achieve the maximum sensitivity of the sensor. In addition to wavelength interrogation, the sensor can also work on intensity modulation. The selectivity of the sensor towards chlorine gas is verified by carrying out measurements for different gases. The sensor has various advantages such as better sensitivity, good selectivity, reusability, fast response, low cost, capability of online monitoring and remote sensing.
Highlights
IntroductionKnown as bertholite, is a highly virulent halogen gas with a reeking smell
Chlorine gas, known as bertholite, is a highly virulent halogen gas with a reeking smell
In this study we present the fabrication and characterization of a fiber optic sensor for the detection of chlorine gas using surface plasmon resonance technique
Summary
Known as bertholite, is a highly virulent halogen gas with a reeking smell It is being used for many applications such as bleaching agent, disinfecting agent, oxidizing agent, in producing pharmaceutical drugs, as combating putrefaction and even as a minacious weapon in wars. In literature many gas sensors have been reported especially for the chlorine gas, which is of interest in the current paper, using electrochemical methods with ionic and semiconductor sensing elements [2,3,4,5,6,7,8,9] These sensors have one or more of the following shortcomings: the methods are bit complicated, time taking, temperature dependent, high recovery time, needs to reduce oxygen deficiencies in case of metal oxide substrate such as zinc oxide, less reusability and more costly. One of the chlorine sensors reported has used zinc oxide with some surface modification to reduce the oxygen deficiencies as it makes the sensor insensitive to chlorine gas in its pure form [7]
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