Recent Developments in Modulation Spectroscopy for Methane Detection Based on Tunable Diode Laser

Wang, Fei; Shu-hai, Jia; Wang, Yonglin; Tang, Zhenhua

doi:10.3390/app9142816

Cited by 37 publications

(19 citation statements)

References 122 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, WMS techniques are most widely used in TDLAS for standoff gas detection. Owing to the suppression of noise, the sensitivity of modulation spectroscopy can be brought into the 10 −5 -10 −6 range or even better [89]. It can be seen that this scheme is similar to the TDLAS with a gas cell system, except that the open-path is used to replace the multipath gas absorption cell.…”

Section: Tdlas With Retroreflectorsmentioning

confidence: 99%

“…Therefore, WMS techniques are most widely used in TDLAS for standoff gas detection. Owing to the suppression of noise, the sensitivity of modulation spectroscopy can be brought into the 10 −5 -10 −6 range or even better [89]. gaseous medium through an off-axis parabolic mirror (OAPM) with a small hole and then illuminates onto an opposite optical reflector.…”

Section: Tdlas With Retroreflectorsmentioning

confidence: 99%

“…QCL based LHR has been widely used for atmospheric sounding [198][199][200][201][202]. A 3.53 µm ICL, moreover, has been employed as the LO source to retrieve the concentration of H 2 O and CH 4 column recently [89,203]. However, NIR DFB-LD based LHR still has great research value and significance, because it provides a low-cost, miniaturized and robust strategy [204][205][206][207][208].…”

Section: Laser Heterodyne Radiometry (Lhr)mentioning

confidence: 99%

See 2 more Smart Citations

Standoff Chemical Detection Using Laser Absorption Spectroscopy: A Review

et al. 2020

Remote Sensing

View full text Add to dashboard Cite

Remote chemical detection in the atmosphere or some specific space has always been of great interest in many applications for environmental protection and safety. Laser absorption spectroscopy (LAS) is a highly desirable technology, benefiting from high measurement sensitivity, improved spectral selectivity or resolution, fast response and capability of good spatial resolution, multi-species and standoff detection with a non-cooperative target. Numerous LAS-based standoff detection techniques have seen rapid development recently and are reviewed herein, including differential absorption LiDAR, tunable laser absorption spectroscopy, laser photoacoustic spectroscopy, dual comb spectroscopy, laser heterodyne radiometry and active coherent laser absorption spectroscopy. An update of the current status of these various methods is presented, covering their principles, system compositions, features, developments and applications for standoff chemical detection over the last decade. In addition, a performance comparison together with the challenges and opportunities analysis is presented that describes the broad LAS-based techniques within the framework of remote sensing research and their directions of development for meeting potential practical use.

show abstract

Section: Tdlas With Retroreflectorsmentioning

confidence: 99%

“…Therefore, WMS techniques are most widely used in TDLAS for standoff gas detection. Owing to the suppression of noise, the sensitivity of modulation spectroscopy can be brought into the 10 −5 -10 −6 range or even better [89]. gaseous medium through an off-axis parabolic mirror (OAPM) with a small hole and then illuminates onto an opposite optical reflector.…”

Section: Tdlas With Retroreflectorsmentioning

confidence: 99%

Section: Laser Heterodyne Radiometry (Lhr)mentioning

confidence: 99%

See 1 more Smart Citation

Standoff Chemical Detection Using Laser Absorption Spectroscopy: A Review

et al. 2020

Remote Sensing

View full text Add to dashboard Cite

show abstract

“…Methane instrumentation applicable for small UAVs display a diverse variety of specifications, including measurement type, weight, measurement frequency, detection limit and precision (e.g. [55][56][57][58]). Some of these parameters, such as the instrument response time, will have an impact on the accuracy and spatiotemporal representability of measurements when using a mobile platform [59].…”

Section: Methane Measurement Approachesmentioning

confidence: 99%

Methods for quantifying methane emissions using unmanned aerial vehicles: a review

Shaw

Shah

Han

et al. 2021

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

Methane is an important greenhouse gas, emissions of which have vital consequences for global climate change. Understanding and quantifying the sources (and sinks) of atmospheric methane is integral for climate change mitigation and emission reduction strategies, such as those outlined in the 2015 UN Paris Agreement on Climate Change. There are ongoing international efforts to constrain the global methane budget, using a wide variety of measurement platforms across a range of spatial and temporal scales. The advancements in unmanned aerial vehicle (UAV) technology over the past decade have opened up a new avenue for methane emission quantification. UAVs can be uniquely equipped to monitor natural and anthropogenic emissions at local scales, displaying clear advantages in versatility and manoeuvrability relative to other platforms. Their use is not without challenge, however: further miniaturization of high-performance methane instrumentation is needed to fully use the benefits UAVs afford. Developments in the models used to simulate atmospheric transport and dispersion across small, local scales are also crucial to improved flux accuracy and precision. This paper aims to provide an overview of currently available UAV-based technologies and sampling methodologies which can be used to quantify methane emission fluxes at local scales. This article is part of a discussion meeting issue 'Rising methane: is warming feeding warming? (part 1)'.

show abstract

“…The last three review papers, authored by Z. Du, F. Wang, and X. Chao, respectively, mainly focus on direct laser absorption spectroscopy, especially in the mid-infrared region [16][17][18]. All the above review papers presented a full discussion with regard to the related technical field of gas sensing.…”

Section: Main Content Of the Special Issuementioning

confidence: 99%