Journal ArticleDOI
A review on non-dispersive infrared gas sensors: Improvement of sensor detection limit and interference correction
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TLDR
In this paper, a review of the non-dispersive infrared (NDIR) gas sensors applied in an environmental field is presented, where the authors consider the advantages and disadvantages of these sensors, such as spectral interference and high detection limit.Abstract:
Non-dispersive infrared (NDIR) gas sensors applied in an environmental field are considered. Disadvantages of the non-dispersive infrared (NDIR) gas sensors include spectral interference and high detection limit. Efforts to improve these disadvantages are reviewed in this paper. Interference caused by water vapor and gas matrix has been partially solved using optical filters and interference correction factors. Limitations such as accuracy and sensitivity of the sensor were overcome by the improvements of inlet gas concentrations, infrared sources, optical designs (including optical filter and gas chamber) and detectors. These improvements are limited to a few gases, in particular, carbon dioxide. Drawbacks related to water vapor still remain and need to be addressed.read more
Citations
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Contact-Based Methods for Measuring Respiratory Rate
Carlo Massaroni,Andrea Nicolò,Daniela Lo Presti,Massimo Sacchetti,Sergio Silvestri,Emiliano Schena +5 more
TL;DR: An overview of the currently available contact-based methods for measuring respiratory rate is provided, based upon the recording of respiratory airflow, sounds, air temperature, air humidity, air components, chest wall movements, and modulation of the cardiac activity.
Journal ArticleDOI
Towards Integrated Mid-Infrared Gas Sensors.
Daniel Popa,Florin Udrea +1 more
TL;DR: Recent progress towards the miniaturization and integration of optical gas sensors, with a focus on low-cost and low-power consumption devices is reviewed.
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Air pollution terrain nexus: A review considering energy generation and consumption
Xuechao Wang,Jiří Jaromír Klemeš,Xiaobin Dong,Weiguo Fan,Zihan Xu,Yutao Wang,Petar Sabev Varbanov +6 more
TL;DR: In this article, the authors provide a better understanding of the air pollution terrain nexus and highlight the existing limitations and challenges, which can contribute to mitigating air pollution problems and improve the air quality.
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Hybrid Metamaterial Absorber Platform for Sensing of CO2 Gas at Mid-IR.
Dihan Hasan,Chengkuo Lee +1 more
TL;DR: The results will pave the way for a physical understanding of metamaterial‐based sensing when integrated with the mid‐IR detector for readout and extending the mid-IR functionalities of selective polymers for the detection of technologically relevant gases.
Journal ArticleDOI
Environmental chemical sensing using small drones: A review.
Javier Burgués,Santiago Marco +1 more
TL;DR: A comprehensive, structured and updated review of the field of chemical sensing using small drones, which exhaustively review current and emerging applications of this technology, as well as sensing platforms and algorithms developed by research groups and companies for tasks such as gas concentration mapping, source localization, and flux estimation.
References
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TL;DR: In this article, the authors present a textbook for introductory courses in remote sensing, which includes concepts and foundations of remote sensing; elements of photographic systems; introduction to airphoto interpretation; air photo interpretation for terrain evaluation; photogrammetry; radiometric characteristics of aerial photographs; aerial thermography; multispectral scanning and spectral pattern recognition; microwave sensing; and remote sensing from space.
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TL;DR: An overview and evaluation of state-of-the-art photodetectors based on graphene, other two-dimensional materials, and hybrid systems based on the combination of differentTwo-dimensional crystals or of two- dimensional crystals and other (nano)materials, such as plasmonic nanoparticles, semiconductors, quantum dots, or their integration with (silicon) waveguides are provided.
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