Gas sensing based on detection of light radiation from a region of modified cladding (nanocrystalline ZnO) of an optical fiber

Devendiran, S.; Sastikumar, D.

doi:10.1016/j.optlastec.2016.10.013

Cited by 47 publications

(13 citation statements)

References 22 publications

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“…The evanescent field exponentially decaying in the nature from core to cladding. But when the cladding is coated with high refractive index (RI) materials with Ag/ZnO then the upper surface of cladding acts as a core and more light leaks into the cladding . The intensity of light at output detector decreases due to penetration of more light into the modified cladding.…”

Section: Resultsmentioning

confidence: 99%

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Detection of Ammonia Gas Molecules in Aqueous Medium by Using Nanostructured Ag‐Doped ZnO Thin Layer Deposited on Modified Clad Optical Fiber

Singh

Dutta

Dhar

et al. 2019

Physica Status Solidi (a)

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The synthesis of Ag-doped ZnO nanorod employing hydrothermal process over modified cladd optical fiber is reported. The developed material is characterized using X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and Brunauer-Emmett-Teller (BET) analysis to evaluate the morphology and the nature of nanorod formed. The initial performance of the coated modified clad optical fiber toward detection of ammonia gas in aqueous solution is also presented. The sensing performance revealed that the developed material possess improved sensitivity toward ammonia gas at room temperature compared to Ag doped nanowires containing optical fiber sensor.

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Section: Resultsmentioning

confidence: 99%

“…In order to make optoelectronic devices based on ZnO, formation of p type and n type states are essential . However, doping of nobel metals like Ag, Au, Pt, Pd etc. are co‐doped with ZnO in order to enhances the surface area and electronic properties to achieve improved sensing performances.…”

Section: Introductionmentioning

confidence: 99%

Detection of Ammonia Gas Molecules in Aqueous Medium by Using Nanostructured Ag‐Doped ZnO Thin Layer Deposited on Modified Clad Optical Fiber

Singh

Dutta

Dhar

et al. 2019

Physica Status Solidi (a)

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“…The coating thickness on the clad removal part is about 30 µm [10]. The principle of an optical fibre is total internal reflection [22] when it applied to the interface of the core‐modified clad, all the intensity has not reflected back at the interface and some part of intensity has penetrated into the modified clad part and that intensity is called evanescent wave which decays exponentially away from the interface. In this clad‐modified fibre one end of the fibre is connected to the source while the other end of the fibre is connected to the detector.…”

Section: Resultsmentioning

confidence: 99%

Evanescent wave ammonia sensor: influence of nanocrystalline TiO ₂ on V ₂ O ₅ and MoO ₃

Chandrasekar¹,

Subashini

Renganathan

et al. 2019

Micro & Nano Letters

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Clad-modified fibre optic ammonia sensor was developed subsequently using pure V 2 O 5 , MoO 3 , and its composites with TiO 2. Prior to the sensing measurement, the composite was synthesised and studied for the structural and microstructural properties using powder X-ray diffractometer and field emission scanning electron microscope. The analysis confirms the existence of nanocrystalline anatase phase TiO 2 in the grain boundaries of microcrystalline V 2 O 5 /MoO 3 in the composites. Ammonia sensing measurement was performed for different concentrations of ammonia exposures up to 500 ppm. The obtained response was applied to calculate the sensitivity and it was found to be superior for the clad modified with composite material as compared to the pure microcrystalline samples are discussed in detail.

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“…The radiation detection fiber was connected to the optical spectrometer (EPP -2000; Stellarnet, Inc., USA) having a spectral range of 200-1200 nm and the transmitting fiber was coupled to the tungsten-halogen light source (SL1; Stellarnet, Inc., USA) having an emission wavelength range of 350-2200 nm. The other end of the transmitting fiber connected to the photo detector (New port-818) having a spectral response range of 400-1100nm [8,9]. Initially, different concentrations of ammonia, ethanol, methanol, and acetone gases (100, 200, 300, 400 & 500 ppm) were prepared and mixed with the carrier gas (air -flow rate of 1 l/min) using air pump.…”

Section: B Gas Sensing Setupmentioning

confidence: 99%

“…This gas combination was injected into the gas chamber through the inlet and light output was recorded. The experiment was carried out at room temperature (about 25°C) with the relative humidity of about 71% [9].…”

Section: B Gas Sensing Setupmentioning

confidence: 99%

Detection of Emanated Light at the Modified Clad Region (Sno2) of the Optical Fiber for Methanol Gas Sensing

Devendiran*,

Suresh,

Palanivelu

et al. 2020

IJRTE

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A leakage detecting sensor (radiation mode (or) double fiber mode) is proposed to monitor the light rays propagates from the surface of the modified clad region (SnO2 ) of the optical fiber. The output intensity increases and decreases for the varying gas concentration (0-500 ppm) with the presence of different gases (methanol, ethanol, acetone and ammonia) at room temperature. The received output intensity from the clad modified surface increases for ammonia and methanol, whereas, it decreases for acetone and ethanol gases for the increase in the gas concentration. However, in the transmitting mode (single fiber mode) the output light intensity decreases for all the gases with varying gas concentration. The output gas sensitivity of the proposed sensor (double fiber mode) is compared with the transmitting mode sensor and the sensor shows superior response for methanol over other gases. The dynamic characteristics of the sensor are reported.

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Gas sensing based on detection of light radiation from a region of modified cladding (nanocrystalline ZnO) of an optical fiber

Cited by 47 publications

References 22 publications

Detection of Ammonia Gas Molecules in Aqueous Medium by Using Nanostructured Ag‐Doped ZnO Thin Layer Deposited on Modified Clad Optical Fiber

Detection of Ammonia Gas Molecules in Aqueous Medium by Using Nanostructured Ag‐Doped ZnO Thin Layer Deposited on Modified Clad Optical Fiber

Evanescent wave ammonia sensor: influence of nanocrystalline TiO ₂ on V ₂ O ₅ and MoO ₃

Detection of Emanated Light at the Modified Clad Region (Sno2) of the Optical Fiber for Methanol Gas Sensing

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Gas sensing based on detection of light radiation from a region of modified cladding (nanocrystalline ZnO) of an optical fiber

Cited by 47 publications

References 22 publications

Detection of Ammonia Gas Molecules in Aqueous Medium by Using Nanostructured Ag‐Doped ZnO Thin Layer Deposited on Modified Clad Optical Fiber

Detection of Ammonia Gas Molecules in Aqueous Medium by Using Nanostructured Ag‐Doped ZnO Thin Layer Deposited on Modified Clad Optical Fiber

Evanescent wave ammonia sensor: influence of nanocrystalline TiO 2 on V 2 O 5 and MoO 3

Detection of Emanated Light at the Modified Clad Region (Sno2) of the Optical Fiber for Methanol Gas Sensing

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Evanescent wave ammonia sensor: influence of nanocrystalline TiO ₂ on V ₂ O ₅ and MoO ₃