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Special Issue "Recent Advances in Photoacoustic and Photothermal Gas Spectroscopy"

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Analytical Chemistry".

Deadline for manuscript submissions: 30 June 2022.

Special Issue Editors

Dr. Angelo Sampaolo
E-Mail Website
Guest Editor
Dipartimento Interateneo di Fisica (Department of Physics) Politecnico di Bari, Via Edoardo Orabona n. 4, 70125 Bari, Italy
Interests: optoelectronics and nanotechnology; innovative optical gas sensor systems based on Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS); Light-induced thermoelastic spectroscopy (LITES) and Tunable diode laser absorption spectroscopy (TDLAS) and their application to environmental monitoring, industrial process analysis, control, medical diagnostics
Special Issues, Collections and Topics in MDPI journals
Dr. Hongpeng Wu
E-Mail Website
Guest Editor
Institute of Laser Spectroscopy, Shanxi University, Taiyuan, China
Interests: photoacoustic spectrometry; photothermal Spectroscopy; laser applications in environmental monitoring, industrial process control and medicine
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The growing interest in developing photoacoustic and photothermal sensors is widely justified by the possibility of avoiding the use of optical detectors while exploiting the high selectivity provided by the spectral characteristics of laser sources. Moreover, these spectroscopic approaches proved to be highly compatible with the engineering and downscaling of sensing devices. So far the developed gas sensor prototypes have promptly satisfied the requests for portability and deployability for out-of-laboratory operations, but now they are called to sustain a further evolution. The challenges posed by the technology and applications market consist in a high level of integrability, miniaturization and compaction, modularity, and versatility for detecting different analytes and working in harsh environments. For example, applications such as environmental monitoring assisted by unmanned vehicles require multi-gas detection, low power consumption, lightweight and robustness, while applications such as leak detection or natural gas analysis in the oil & gas field mainly require the sensitive elements to operate properly in wide ranges of pressure and temperature. Furthermore, the sensors must be easy to be integrated into pre-existing measurement tools and immune to external noise at the same time. The constant need to address these issues demands for a state of the art of optical spectroscopy updated and easily accessible to the scientific community.

For this reason, we conceived this Special Issue, in collaboration with the MDPI journal Molecules, with the aim of collecting and connecting all the provided contributions, works, and analyses that are currently pushing photoacoustic (PAS) and photothermal (PTS) gas spectroscopy to the state of the art. The topics will include, among many other related approaches and applications, the newest configurations of photoacoustic resonant cells and all the developments related with Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS): from the implementation of custom tuning forks (QTFs) and custom acoustic detection modules to more fundamental issues concerning the physics of photoacoustic generation, energy relaxation, QTF vibrational dynamics. The other core topic will be photothermal gas spectroscopy in its diversified declinations and architectures, such as photothermal sensors based on fibers or optical cavities and novel approaches relying on quartz tuning forks that evolved in Light-Induced Thermoelastic Spectroscopy (LITES). It is our hope that all the articles collected in the Special Issue will provide useful guidelines for spectroscopists to identify suitable solutions for in-situ and real-time applications.

Dr. Angelo Sampaolo
Dr. Hongpeng Wu
Guest Editors

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 papers will be 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. Molecules 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 2300 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

  • gas sensing
  • spectroscopy sensing
  • photoacoustic spectroscopy
  • quartz-enhanced photoacoustic spectroscopy
  • photothermal spectroscopy
  • light-induced thermoelastic spectroscopy
  • quartz tuning forks
  • environmental monitoring
  • in-situ real-time applications

Published Papers (2 papers)

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Research

Article
Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation
Molecules 2021, 26(3), 609; https://doi.org/10.3390/molecules26030609 - 25 Jan 2021
Viewed by 658
Abstract
We report on the use of quartz-enhanced photoacoustic spectroscopy for continuous carbon-dioxide measurements in humid air over a period of six days. The presence of water molecules alters the relaxation rate of the target molecules and thus the amplitude of the photoacoustic signal. [...] Read more.
We report on the use of quartz-enhanced photoacoustic spectroscopy for continuous carbon-dioxide measurements in humid air over a period of six days. The presence of water molecules alters the relaxation rate of the target molecules and thus the amplitude of the photoacoustic signal. Prior to the measurements, the photoacoustic sensor system was pre-calibrated using CO2 mole fractions in the range of 0–10−3 (0–1000 ppm) and at different relative humidities between 0% and 45%, while assuming a model hypothesis that allowed the photoacoustic signal to be perturbed linearly by H2O content. This calibration technique was compared against an alternative learning-based method, where sensor data from the first two days of the six-day period were used for self-calibration. A commercial non-dispersive infrared sensor was used as a CO2 reference sensor and provided the benchmark for the two calibration procedures. In our case, the self-calibrated method proved to be both more accurate and precise. Full article
(This article belongs to the Special Issue Recent Advances in Photoacoustic and Photothermal Gas Spectroscopy)
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Article
Fiber-Coupled Quartz-Enhanced Photoacoustic Spectroscopy System for Methane and Ethane Monitoring in the Near-Infrared Spectral Range
Molecules 2020, 25(23), 5607; https://doi.org/10.3390/molecules25235607 - 28 Nov 2020
Cited by 7 | Viewed by 1129
Abstract
We report on a fiber-coupled, quartz-enhanced photoacoustic spectroscopy (QEPAS) near-IR sensor for sequential detection of methane (CH4 or C1) and ethane (C2H6 or C2) in air. With the aim of developing a lightweight, compact, low-power-consumption sensor suitable for unmanned [...] Read more.
We report on a fiber-coupled, quartz-enhanced photoacoustic spectroscopy (QEPAS) near-IR sensor for sequential detection of methane (CH4 or C1) and ethane (C2H6 or C2) in air. With the aim of developing a lightweight, compact, low-power-consumption sensor suitable for unmanned aerial vehicles (UAVs)-empowered environmental monitoring, an all-fiber configuration was designed and realized. Two laser diodes emitting at 1653.7 nm and 1684 nm for CH4 and C2H6 detection, respectively, were fiber-combined and fiber-coupled to the collimator port of the acoustic detection module. No cross talk between methane and ethane QEPAS signal was observed, and the related peak signals were well resolved. The QEPAS sensor was calibrated using gas samples generated from certified concentrations of 1% CH4 in N2 and 1% C2H6 in N2. At a lock-in integration time of 100 ms, minimum detection limits of 0.76 ppm and 34 ppm for methane and ethane were achieved, respectively. The relaxation rate of CH4 in standard air has been investigated considering the effects of H2O, N2 and O2 molecules. No influence on the CH4 QEPAS signal is expected when the water vapor concentration level present in air varies in the range 0.6–3%. Full article
(This article belongs to the Special Issue Recent Advances in Photoacoustic and Photothermal Gas Spectroscopy)
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