Distributed nerve gases sensor based on IR absorption in hollow optical fiber

Viola, Roberto; Liberatore, Nicola; Luciani, Domenico; Mengali, Sandro; Pierno, L.

doi:10.1117/12.865009

Cited by 4 publications

(6 citation statements)

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“…60 Among these factors, a high waveguide optical loss, resulting in limited light−gas interaction lengths, is the main reason for the limited LOD. 61 To solve this problem, researchers studied advanced device fabrication techniques for developing ultralow optical loss waveguide devices. 62,63 Moreover, the absorption crosssection enhancement by using on-chip nanophotonic devices, or by taking advantage of gas molecular fundamental vibrational transitions in the mid-infrared wavelength range is explored to improve LODs.…”

Section: ■ Principles Of On-chip Optical Gas Sensorsmentioning

confidence: 99%

On-Chip Optical Gas Sensors Based on Group-IV Materials

Yue

Chen

et al. 2020

ACS Photonics

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Compact and smart optical gas sensors have attracted significant attention over the past few decades. Among the materials used for developing such gas sensors, group-IV materials, including silicon, germanium, carbon allotropes, and their compounds, are considered the most promising candidates. By virtue of their inherent compatibility with the CMOS fabrication process in the mature microelectronics industry, onchip optical gas sensors based on group-IV materials have merits of appreciable sensitivity and high-density integration. Moreover, such sensors have promising potential to be integrated with other electronic or photonic devices for on-chip signal processing and communication, which are expected to enable versatile applications in the internet of things, point-of-care testing, and information and communication technology. This paper is the review of basic principles, state-of-the-art devices, and cutting-edge applications of on-chip optical gas sensors based on group-IV materials and discussions of their prospects.

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Section: ■ Principles Of On-chip Optical Gas Sensorsmentioning

confidence: 99%

On-Chip Optical Gas Sensors Based on Group-IV Materials

Yue

Chen

et al. 2020

ACS Photonics

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“…a. Measurement of precise dose delivery is very crucial for treatment of cancer (40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50) Gy in about 20 sittings).…”

Section: Optical Fiber Composition Optimization For High Gamma Dose Amentioning

confidence: 99%

“…The optical fibers here perform a passive role like transfer of light to and from absorption cell but play no active role in gas sensing. The National Aeronautics and Space Administration (NASA) reported a multi-point fiber optic multi-point hydrogen micro-sensor system for leak detection for launch vehicles [43]. The system consists of a multiplexed system having palladium coated micro lens attached to fiber tips.…”

Section: Distributed Gas Sensorsmentioning

confidence: 99%

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Distributed, Advanced Fiber Optic Sensors

Kher¹,

Saxena²

2019

Applications of Optical Fibers for Sensing

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India is poised to use nuclear energy in a big way. The safety of these systems depends upon monitoring various parameters in hazardous environment like high radiation, high temperature exceeding 1000°C, and gas/coolant leakages. In this chapter, we shall dwell on basics of distributed sensing, related instrumentation, device fabrication, and actual advanced field applications. Techniques like Raman scattering, resonance response of fiber gratings, and selective absorption are employed for design, development, and fabrication of distributed sensors and devices. Raman distributed sensors with advanced data processing techniques are finding increasing applications for fire detection, coolant leak detection, and safety of large structures. The systematic investigations related to portable systems developed at the author's lab have been described. Wavelength-encoded fiber gratings are the attractive candidate for high gamma radiation dose measurements in environment such as particle accelerators, fission reactors, food processing facilities, and ITER-like installations. The basics of fiber gratings, their operational designs, and devices based on fiber gratings have been described with advanced applications like high temperature sensing, strain measurements at cryogenic temperatures, and strain in nuclear environment. Finally, novel approaches are described for distributed hazardous gas monitoring for large areas such as airports, train stations, and reactor containment buildings.

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“…However, no dispersive infrared (NDIR) is the most useful method for CO 2 detection, which works based on gas absorption in mid-infrared region (Tan et al, 2015). This detection technique has benefits such as higher reproducibility, accuracy, selectivity and lower power consumption compare to other methods (Viola et al, 2010). In this method, the light intensity passing through the channel decreases at the gas absorption wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Low cost and miniaturized NDIR system for CO₂ detection applications

Akram

Nikfarjam

Hajghassem

et al. 2020

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Purpose The importance of Carbon dioxide (CO2) gas detection as a greenhouse and exhale breathe gas is an undeniable issue. This study aims to propose a new miniaturized, low cost and portable no dispersive infrared (NDIR) system for detecting CO2 gas. Design/methodology/approach Poly(methyl methacrylate) (PMMA)-based channels with Au coating because of its high reflection properties in IR region were used in this work. The optical windows were fabricated using PDMS polymer which is cost effective and novel in comparison to other conventional methods. The effects of channel dimensions, lengths and entrance angle of light on optical path length and losses were analyzed with four types of channel using both simulation and experimental tests. Findings The simulation results indicate that the 0 degree light entrance angle is the most efficient angle among different investigated conditions. The experimental data are in agreement with the simulation results regarding the loss and optical path length in different types of channel. The experimental tests were performed for the 0.5% up to 20% of CO2 concentration under constant temperature and humidity condition. The results show that the device with 5 and 2 cm channels length were saturated in 4% and 8% concentration of CO2 gas, respectively. Response and recovery times were depending on gas concentration and channels specifications that in average found to be 10 S and 14 S, respectively, for the largest size channel. Moreover, the environment humidity effect on detection system performance was investigated which had no considerable influence. Also, the saturation fraction absorbance value for devices with various dimensions were 0.62 and 0.8, respectively. Practical implications According to the performed curve fitting for practical situation and selected CO2 concentration range for experimental tests, the device is useful for medical and environmental applications. Originality/value PMMA with Au deposition layer was used as a basic material for this NDIR system. Besides, a novel PDMS optical window helps to have a low cost device. The effects of channel dimensions, lengths and entrance angle of light on optical path length and losses were analyzed using both simulation and experimental tests. Using narrowband optical filter (100 nm bandwidth) helps to have a system with good CO2 selectivity. In addition, experimental tests with different channel dimensions and lengths covered a considerable range of CO2 concentration useful for medical and environmental applications. Finally, curve fitting was adopted for a modified Beer–Lambert law as a practical situation.

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Distributed nerve gases sensor based on IR absorption in hollow optical fiber

Cited by 4 publications

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On-Chip Optical Gas Sensors Based on Group-IV Materials

On-Chip Optical Gas Sensors Based on Group-IV Materials

Distributed, Advanced Fiber Optic Sensors

Low cost and miniaturized NDIR system for CO₂ detection applications

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Distributed nerve gases sensor based on IR absorption in hollow optical fiber

Cited by 4 publications

References 0 publications

On-Chip Optical Gas Sensors Based on Group-IV Materials

On-Chip Optical Gas Sensors Based on Group-IV Materials

Distributed, Advanced Fiber Optic Sensors

Low cost and miniaturized NDIR system for CO2 detection applications

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Product

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Low cost and miniaturized NDIR system for CO₂ detection applications