NDLI: Evanescent wave optical fibre ammonia sensor with methylamine hydroiodide

Content Provider	IET Digital Library
Author	Thangaraj, Subashini Paramasivan, Chandrasekar Balusamy, Renganathan Arumainathan, Stephen Thanigainathan, Prakash
Abstract	A small portion of an optical fibre clad was removed and coated with methylamine hydroiodide by a slurry deposition process to develop an evanescent wave optical fibre ammonia sensor. The experiment was performed for a few volatile organic compounds in order to understand the selectivity and sensitivity. Prior to the gas sensing measurement, the methylamine hydroiodide sample was characterised using X-ray diffraction (XRD), scanning electron microscope with energy dispersive X-ray spectroscopy, Fourier transform infrared, Raman, diffuse reflectance and UV–Vis spectroscopy. In order to understand the sensor response, the samples were independently exposed to acetone, ammonia, ethanol and methanol gases and then analysed using the XRD technique. This analysis reveals that the structural variation is observed because of the ammonia exposure as compared to other gases. It has initiated to fabricate a clad-modified optical fibre ammonia sensor that exhibits ∼28% of the sensitivity. These experimental results are discussed in detail.
Starting Page	292
Ending Page	295
Page Count	4
ISSN	17518768
Volume Number	14
e-ISSN	17518776
Issue Number	Issue 5, Oct (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-opt/14/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-opt.2019.0144
Journal	IET Optoelectronics
Publisher Date	2020-04-30
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Ammonia Antireflection Coatings Chemical Sensor Chemical Variables Measurement Clad-modified Optical Fibre Ammonia Sensor Coating Diffuse Reflectance Electromagnetic Radiation Spectrometry (chemical Analysis) Energy Dispersive X-Ray Spectroscopy Ethanol Gases Evanescent Wave Optical Fibre Ammonia Sensor Fibre Gyros Fibre Optic Sonsor Fourier Transform Infrared Spectroscopy Gas Sensing Measurement Gas Sonsor Methanol Gases Methylamine Hydroiodide Sample NH3 Optical Coatings Optical Coatings And Filter Optical Fibre Cladding Optical Fibre Fabrication Optical Fibre Joining Optical Fibre Splicing Optical Film Optical Material Organic Compound Raman Spectroscopy Scanning Electron Microscopy Slurry Deposition Process Ultraviolet Spectroscopy UV–Vis Spectroscopy Visible Spectroscopy Volatile Organic Compound X-Ray Chemical Analysis X-Ray Diffraction X-Ray Diffraction Technique X-Ray Spectroscopy XRD Technique
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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