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Opt Express

Title:		Negative axicon tip-based fiber optic interferometer cavity sensor for volatile gas sensing
Author(s):		Kanawade R; Kumar A; Pawar D; Vairagi K; Late D; Sarkar S; Sinha RK; Mondal S;
Address:
Journal Title:		Opt Express
Year:		2019
Volume:		27
Issue:		5
Page Number:		7277 - 7290
DOI:		10.1364/OE.27.007277
ISSN/ISBN:		1094-4087 (Electronic) 1094-4087 (Linking)
Abstract:		"In this research work we demonstrated negative axicon optical fiber tip filled with Polydimethylsiloxane (PDMS) as a sensor platform for volatile organic gases detection at room temperature. The response of the sensor was measured with various Volatile Organic Compounds (VOCs) such as Chloroform, Hexane, Isopropanol, Acetone, Toluene and Methanol in the concentration ranging from 5 to 200 ppm. The corresponding sensitivity and limit of detection (LOD) of the developed sensor for the measured VOCs were observed between the order of around 23.7 to 3.2 pm/ppm and 0.84 to 6.10 ppm, respectively. The response and recovery time of sensor were found between the order of 30 to 57 seconds and 8 to 25 seconds respectively for the measured VOCs. Thermal stability of the developed sensor was also studied at 30-70 degrees C with intervals of 10 degrees C. The principle of sensing is based on change in the length of the Fabry-Perot Interferometric (FPI) cavity in the presence of varied concentrations of VOCs, which results in changes in the shift in wavelength of an interference pattern attributed to the change in PDMS filling the cavity length (swelling). The experimentally observed trends in the relative swelling of PDMS with VOCs are found in agreement with the theoretically calculated values obtained from the Hansen solubility parameter (HSP). The developed gas sensor has the potential to fulfill the demands of industrial applications"
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Notes:		"PubMed-not-MEDLINEKanawade, Rajesh Kumar, Ajay Pawar, Dnyandeo Vairagi, Kaushal Late, Dattatray Sarkar, Sudipta Sinha, Ravindra K Mondal, Samir eng 2019/03/17 Opt Express. 2019 Mar 4; 27(5):7277-7290. doi: 10.1364/OE.27.007277"