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Optical Spectroscopy for Sensing, Monitoring and Analysis: 2nd Edition

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

Deadline for manuscript submissions: 31 July 2025 | Viewed by 621

Special Issue Editors


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Guest Editor
Oak Ridge National Laboratory, Radioisotope Science and Technology Division, Oak Ridge, TN 37830, USA
Interests: real-time monitoring; laser-induced breakdown spectroscopy; machine learning
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Oak Ridge National Laboratory, Radioisotope Science and Technology Division, 1 Bethel ValleyRoad, Oak Ridge, TN 37380, USA
Interests: optical spectroscopy; spectroelectrochemistry; separations; design of experiments; chemometrics; machine learning

E-Mail Website
Guest Editor
Nuclear Engineering Program, Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA
Interests: remote sensing; nuclear nonproliferation/counterproliferation; nuclear security; nuclear policy

Special Issue Information

Dear Colleagues,

Based on the positive turnout of our previous issue we are happy to announce a 2nd Special issue on “Optical Spectroscopy for Sensing, Monitoring, and Analysis”. You can view the original Special Issue here: https://www.mdpi.com/journal/sensors/special_issues/14NLO90B2H .

There is a growing need for sensors that are capable of monitoring a plethora of analytes in complex and hazardous environments in real time. Optical spectroscopy is an ideal candidate for these sensor applications due to the intrinsic ability to send light to and from a measurement point using optics or fibers, thereby protecting expensive equipment from exposure. These applications of optical spectroscopy have seen rapid growth in their capabilities due to advances in equipment, modeling techniques, and sensor fusion. Outside of in situ analysis, similar advances have been made to enable the use of optical spectroscopy for further sample characterization.

This Special Issue therefore aims to put together original research and review articles on recent advances, technologies, solutions, applications, and new challenges in the field of optical spectroscopy for sensing, monitoring, and analysis.

Dr. Hunter B. Andrews
Dr. Luke R. Sadergaski
Dr. Kyle C. Hartig
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 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

  • optical spectroscopy
  • laser spectroscopy
  • laser-induced breakdown spectroscopy
  • Raman spectroscopy
  • spectrophotometry
  • fluorescence spectroscopy
  • online monitoring
  • sensor fusion
  • chemometrics
  • machine learning

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Published Papers (1 paper)

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Research

15 pages, 1463 KiB  
Article
Integration of FTIR Spectroscopy, Volatile Compound Profiling, and Chemometric Techniques for Advanced Geographical and Varietal Analysis of Moroccan Eucalyptus Essential Oils
by Aimen El Orche, Abdennacer El Mrabet, Amal Ait Haj Said, Soumaya Mousannif, Omar Elhamdaoui, Siddique Akber Ansari, Hamad M. Alkahtani, Shoeb Anwar Ansari, Ibrahim Sbai El Otmani and Mustapha Bouatia
Sensors 2024, 24(22), 7337; https://doi.org/10.3390/s24227337 - 17 Nov 2024
Viewed by 416
Abstract
Eucalyptus essential oil is widely valued for its therapeutic properties and extensive commercial applications, with its chemical composition significantly influenced by species variety, geographical origin, and environmental conditions. This study aims to develop a reliable method for identifying the geographical origin and variety [...] Read more.
Eucalyptus essential oil is widely valued for its therapeutic properties and extensive commercial applications, with its chemical composition significantly influenced by species variety, geographical origin, and environmental conditions. This study aims to develop a reliable method for identifying the geographical origin and variety of eucalyptus oil samples through the application of advanced analytical techniques combined with chemometric methods. Essential oils from Eucalyptus globulus and Eucalyptus camaldulensis were analyzed using Gas Chromatography–Flame Ionization Detection (GC–FID) and Fourier Transform Infrared (FTIR) Spectroscopy. Chemometric analyses, including Orthogonal Partial Least Squares-Discriminant Analysis (O2PLS-DA) and Hierarchical Cluster Analysis (HCA), were utilized to classify the oils based on their volatile compound profiles. Notably, O2PLS-DA was applied directly to the raw FTIR data without additional spectral processing, showcasing its robustness in handling unprocessed data. For geographical origin determination, the GC–FID model achieved a Correct Classification Rate (CCR) of 100%, with 100% specificity and 100% sensitivity for both calibration and validation sets. FTIR spectroscopy achieved a CCR of 100%, specificity of 100%, and sensitivity of 100% for the calibration set, while the validation set yielded a CCR of 95.83%, specificity of 99.02%, and sensitivity of 94.44%. In contrast, the analysis based on species variety demonstrated 100% accuracy across all metrics CCR, specificity, and sensitivity—for both calibration and validation using both techniques. These findings underscore the effectiveness of volatile and infrared spectroscopy profiling for quality control and authentication, providing robust tools for ensuring the consistency and reliability of eucalyptus essential oils in various industrial and therapeutic applications. Full article
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