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Advances in Laser-Based Gas Sensing Technologies
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Advances in Laser-Based Gas Sensing Technologies

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Optical Sensors".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 3970

Special Issue Editor

Dr. Piotr Jaworski

E-Mail Website
Guest Editor
Laser Spectroscopy Group, Faculty of Electronics, Photonics and Microsystems, Wrocław University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
Interests: laser-based spectroscopy; laser-based gas sensing; microstructured optical fibers; hollow-core photonic crystal fibers; fiber lasers
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The rapid development of coherent and broadband light sources, optical and fiber-optics as well as electronics components has resulted in the rise of a broad range of their novel applications. One of those which has been an object of very intensive research carried on worldwide is laser spectroscopy for gas sensing. To date, laser-aided gas sensors have been constructed based on the use of clever measurement techniques, including TDLAS, WMS, PTS, QEPAS, CRDS, broadband optical frequency comb spectroscopy and many more. These techniques are especially efficient when combined with mid-IR laser sources, very sensitive photodetectors and recently microstructured optical fibers, and have enabled optical gas sensors to reach the sensitivity, selectivity and versatility required for the detection of various molecules at trace concentrations.

This Special Issue aims to summarize the state-of-the-art methods, solutions, materials and apparatus currently used in selective, sensitive and precise optical gas sensing. The main topics of the Special Issue are connected with:

  • Photothermal spectroscopy;
  • Photoacoustic spectroscopy;
  • Dispersion spectroscopy;
  • Optical frequency comb spectroscopy;
  • Remote sensing;
  • Tunable and wavelength modulation spectroscopy;
  • Single-frequency and broadband laser sources;
  • Novel materials for optical gas sensing;
  • Microstructured optical fibers and waveguides;
  • Photodetectors and spectrometers.

Dr. Piotr Jaworski
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • laser spectroscopy
  • laser-based gas sensing
  • laser sources for spectroscopy
  • novel optical materials for gas sensing
  • antiresonant hollow-core fibers
  • hollow waveguides
  • mid-IR photodetectors
  • optical frequency comb spectroscopy
  • dual-comb spectroscopy
  • dispersion spectroscopy
  • absorption spectroscopy
  • photothermal spectroscopy
  • cavity-enhanced spectroscopy
  • cavity ring-down spectroscopy
  • photoacoustic spectroscopy
  • remote sensing

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Published Papers (2 papers)

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Research

17 pages, 18047 KiB  
Article
Ultra-Stable Temperature Controller-Based Laser Wavelength Locking for Improvement in WMS Methane Detection
by Fupeng Wang, Jinghua Wu, Rui Liang, Qiang Wang, Yubin Wei, Yaopeng Cheng, Qian Li, Diansheng Cao and Qingsheng Xue
Sensors 2023, 23(11), 5107; https://doi.org/10.3390/s23115107 - 26 May 2023
Cited by 1 | Viewed by 1812
Abstract
In the wavelength modulation spectroscopy (WMS) gas detection system, the laser diode is usually stabilized at a constant temperature and driven by current injection. So, a high-precision temperature controller is indispensable in every WMS system. To eliminate wavelength drift influence and improve detection [...] Read more.
In the wavelength modulation spectroscopy (WMS) gas detection system, the laser diode is usually stabilized at a constant temperature and driven by current injection. So, a high-precision temperature controller is indispensable in every WMS system. To eliminate wavelength drift influence and improve detection sensitivity and response speed, laser wavelength sometimes needs to be locked at the gas absorption center. In this study, we develop a temperature controller to an ultra-high stability level of 0.0005 °C, based on which a new laser wavelength locking strategy is proposed to successfully lock the laser wavelength at a CH4 absorption center of 1653.72 nm with a fluctuation of fewer than 19.7 MHz. For 500 ppm CH4 sample detection, the 1σ SNR is increased from 71.2 dB to 80.5 dB and the peak-to-peak uncertainty is improved from 1.95 ppm down to 0.17 ppm with the help of a locked laser wavelength. In addition, the wavelength-locked WMS also has the absolute advantage of fast response over a conventional wavelength-scanned WMS system. Full article
(This article belongs to the Special Issue Advances in Laser-Based Gas Sensing Technologies)
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Graphical abstract

20 pages, 8365 KiB  
Article
An Investigation of All Fiber Free-Running Dual-Comb Spectroscopy
by Fu Yang, Yanyu Lu, Guibin Liu, Shaowei Huang, Dijun Chen, Kang Ying, Weiao Qi and Jiaqi Zhou
Sensors 2023, 23(3), 1103; https://doi.org/10.3390/s23031103 - 18 Jan 2023
Cited by 1 | Viewed by 1756
Abstract
A dual-comb spectroscopy (DCS) system uses two phase-locked optical frequency combs with a slight difference in the repetition frequency. The spectrum can be sampled in the optical frequency (OF) domain and reproduces the characteristics in the radio frequency (RF) domain through asynchronous optical [...] Read more.
A dual-comb spectroscopy (DCS) system uses two phase-locked optical frequency combs with a slight difference in the repetition frequency. The spectrum can be sampled in the optical frequency (OF) domain and reproduces the characteristics in the radio frequency (RF) domain through asynchronous optical sampling. Therefore, the DCS system shows great advantages in achieving precision spectral measurement. During application, the question of how to reserve the mutual coherence between the two combs is the key issue affecting the application of the DCS system. This paper focuses on a software algorithm used to realize the mutual coherence of the two combs. Therefore, a pair of free-running large anomalous dispersion fiber combs, with a center wavelength of approximately 1064 nm, was used. After the signal process, the absorption spectra of multiple species were simultaneously obtained (simulated using the reflective spectra of narrow-bandwidth fiber Bragg gratings, abbreviated as FBG). The signal-to-noise ratio (SNR) could reach 13.97 dB (25) during the 100 ms sampling time. In this study, the feasibility of the system was first verified through the simulation system; then, a principal demonstration experiment was successfully executed. The whole system was connected by the optical fiber without additional phase-locking equipment, showing promise as a potential solution for the low-cost and practical application of DCS systems. Full article
(This article belongs to the Special Issue Advances in Laser-Based Gas Sensing Technologies)
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