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Optical Sensors for Industry Applications

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

Deadline for manuscript submissions: closed (25 February 2024) | Viewed by 1785

Special Issue Editor

Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan
Interests: materials science; nano-microfabrication and characterization of nano/microstructures; triboelectric nanogenerator (TENG); MEMS/NEMS; optical/photonic/electrical sensors; surface enhanced raman spectroscopy (SERS); new pore peripheral plasmonic mechanism (3PM) of SERS

Special Issue Information

Dear Colleagues,

Optical sensors have been widely applied in many fields of industry, including environmental pollutants, food safety, biomolecules, and medical monitoring, due to their simplicity, low cost, and quick response. Optical sensors can be divided into four types based on the theory they use: interference, fluorescence, absorption, and surface plasmonic resonance (SPR). The interference of lights occurs in the interferometers, gratings, and optical fibers, and the spectra shifts due to the analyte adhesion. The fluorescence intensity and lifetime can be used for the qualitative and quantitative analysis of the materials with fluorescence emission. The absorption spectra change in the visible and infrared lights of the optical sensors or the analytes due to the interaction between the optical sensors and the analytes. The SPR or localized surface plasmonic resonance (LSPR) is based on the nanostructure-enhanced surface plasmonic effect to observe the molecular interaction. The basic concepts of these sensors are measuring the changes of optical parameters such as the refractive index, absorbance, reflectance, intensity, lifetime, polarization, etc. The modeling, design, and fabrication of these optical sensors have huge potential for various applications in healthcare, environmental protection, and food safety in the future.

We invite authors with both engineering and scientific backgrounds, working in any area of optical sensing and applications, to submit their original manuscripts for consideration in this Special Issue. Specific areas of interest include, but are not limited to:

  • Optical sensors;
  • Non-destructive testing (NDT);
  • Interference detection;
  • Fluorescence measurement;
  • Surface plasmonic resonance sensing;
  • Surface-enhanced Raman spectroscopy;
  • Optical materials synthesis;
  • Optical micro-nano structure design;
  • Optical sensors platform fabrication;
  • Optical sensors applications.

Prof. Dr. Chen-Kuei Chung
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

  • optical sensors
  • non-destructive testing (NDT)
  • interference detection
  • fluorescence measurement
  • surface plasmonic resonance sensing
  • surface-enhanced raman spectroscopy
  • optical materials synthesis
  • optical micro-nano structure design
  • optical sensors platform fabrication
  • optical sensors applications

Published Papers (2 papers)

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Research

14 pages, 2664 KiB  
Article
Surface-Enhanced Raman Spectroscopy Using a Silver Nanostar Substrate for Neonicotinoid Pesticides Detection
by Norhayati Abu Bakar, Marco Fronzi and Joseph George Shapter
Sensors 2024, 24(2), 373; https://doi.org/10.3390/s24020373 - 08 Jan 2024
Viewed by 837
Abstract
Surface-enhanced Raman spectroscopy (SERS) has been introduced to detect pesticides at low concentrations and in complex matrices to help developing countries monitor pesticides to keep their concentrations at safe levels in food and the environment. SERS is a surface-sensitive technique that enhances the [...] Read more.
Surface-enhanced Raman spectroscopy (SERS) has been introduced to detect pesticides at low concentrations and in complex matrices to help developing countries monitor pesticides to keep their concentrations at safe levels in food and the environment. SERS is a surface-sensitive technique that enhances the Raman signal of molecules absorbed on metal nanostructure surfaces and provides vibrational information for sample identification and quantitation. In this work, we report the use of silver nanostars (AgNs) as SERS-active elements to detect four neonicotinoid pesticides (thiacloprid, imidacloprid, thiamethoxam and nitenpyram). The SERS substrates were prepared with multiple depositions of the nanostars using a self-assembly approach to give a dense coverage of the AgNs on a glass surface, which ultimately increased the availability of the spikes needed for SERS activity. The SERS substrates developed in this work show very high sensitivity and excellent reproducibility. Our research opens an avenue for the development of portable, field-based pesticide sensors, which will be critical for the effective monitoring of these important but potentially dangerous chemicals. Full article
(This article belongs to the Special Issue Optical Sensors for Industry Applications)
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17 pages, 6144 KiB  
Article
Online Correction of Laser Head Nozzle Position for Laser Metal Deposition Using a Chromatic Confocal Displacement System
by Piotr Koruba, Grzegorz Iskierka, Bartosz Poskart, Jakub Mazur and Adrian Zakrzewski
Sensors 2023, 23(16), 7120; https://doi.org/10.3390/s23167120 - 11 Aug 2023
Viewed by 674
Abstract
The stability and repeatability of laser metal deposition is particularly important when processing multiple layers or depositing material on complex component surfaces, and requires the use of process parameter control including the stand-off distance between the laser head and the substrate. The system [...] Read more.
The stability and repeatability of laser metal deposition is particularly important when processing multiple layers or depositing material on complex component surfaces, and requires the use of process parameter control including the stand-off distance between the laser head and the substrate. The system proposed in this paper for correcting the stand-off parameter is based on a chromatic confocal sensor integrated into a laser head. Then, the spectral signal acquired from the measurement system is processed by using the developed application to compensate for the movement of an additional axis of the kinematic system. This study used an independent verification system based on the digital image correlation method. The validation tests were carried out using the system for correcting the stand-off parameter with different control algorithms and given motion trajectories and substrate materials. The results demonstrate that the developed system can be useful for laser metal deposition. Full article
(This article belongs to the Special Issue Optical Sensors for Industry Applications)
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