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Sensors
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Innovative Photonic and Microwave Sensing Approaches and Their Applications
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Innovative Photonic and Microwave Sensing Approaches and Their Applications

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

Deadline for manuscript submissions: closed (20 July 2022) | Viewed by 9222

Special Issue Editors

Prof. Dr. Nunzio Cennamo

E-Mail Website
Guest Editor
Department of Engineering, University of Campania Luigi Vanvitelli, Via Roma 29, 81031 Aversa, Italy
Interests: optical sensors; biosensors and chemical sensors; optical fiber sensors and optoelectronic devices
Special Issues, Collections and Topics in MDPI journals
Dr. Maria Antonia Maisto

E-Mail Website
Guest Editor
Department of Engineering, University of Campania Luigi Vanvitelli, Via Roma 29, 81031 Aversa, Italy
Interests: electromagnetic inverse problems; near-field microwave sensing and measurement techniques; near-field to far-field transformations; RCS estimation
Special Issues, Collections and Topics in MDPI journals
Dr. Agnese Coscetta

E-Mail
Guest Editor
University of Campania Luigi Vanvitelli, Department of Engineering, Via Roma 29, 81031 Aversa - ITALY
Interests: Optical fiber sensors and optoelectronic devices

Special Issue Information

Photonic and microwave sensors have been shown to be suitable for applications in numerous important fields, including medical diagnostics, environmental monitoring, industrial applications, food safety, and security when fast, portable, low-cost, and rugged devices are needed for detection and identification.

The aim of this Special Issue is to bring together researchers active in the innovative developments of novel sensing schemes, smart materials and receptors, nanostructures, algorithms, and applications of sensor systems. Works addressing the wide aspects of this technology are sought, including, but not limited to, recent developments in new measurement schemes, hybrid devices, novel strategies setup to improve sensor sensitivity and selectivity, miniaturization and multiplexing capabilities, novel hardware and software tools and environments, new bio/chemical receptors, transducer schemes, and novel sensor systems with relative applications.

 

Prof. Nunzio Cennamo
Dr. Maria Antonia Maisto
Dr. Agnese Coscetta
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 sensors
  • Microwave sensors
  • Smart materials and approaches for sensing
  • Applications of optical and microwave sensors and biosensors
  • Principles of sensing in optical and microwave sensors
  • Plasmonic sensors
  • Optical fiber sensors
  • Inverse problems.

Published Papers (4 papers)

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Research

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18 pages, 893 KiB  
Article
Implementation of a Fuzzy Inference System to Enhance the Measurement Range of Multilayer Interferometric Sensors
by Everardo Vargas-Rodriguez, Ana Dinora Guzman-Chavez, Rafael Guzman-Cabrera and Anderson Smith Florez-Fuentes
Sensors 2022, 22(17), 6331; https://doi.org/10.3390/s22176331 - 23 Aug 2022
Cited by 2 | Viewed by 1437
Abstract
This work presents a novel methodology to implement a fuzzy inference system (FIS) to overcome the measurement ambiguity that is typically observed in interferometric sensors. This ambiguity occurs when the measurand is determined by tracing the wavelength position of a peak or dip [...] Read more.
This work presents a novel methodology to implement a fuzzy inference system (FIS) to overcome the measurement ambiguity that is typically observed in interferometric sensors. This ambiguity occurs when the measurand is determined by tracing the wavelength position of a peak or dip of a spectral fringe. Consequently, the sensor measurement range is typically limited to the equivalent of 1 free spectral range (FSR). Here, it is demonstrated that by using the proposed methodology, the measurement range of this type of sensor can be widened several times by overcoming the ambiguity over some FSR periods. Furthermore, in order to support the viability of the methodology, it was applied to a couple of temperature interferometric sensors. Finally, experimental results demonstrated that it was possible to quintuple the measurement range of one of the tested sensors with a mean absolute error of MAE = 0.0045 °C, while for the second sensor, the measurement range was doubled with an MAE = 0.0073 °C. Full article
(This article belongs to the Special Issue Innovative Photonic and Microwave Sensing Approaches and Their Applications)
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9 pages, 2620 KiB  
Communication
Sensitivity Analysis of Sidelobes of the Lowest Order Cladding Mode of Long Period Fiber Gratings at Turn Around Point
by Tanoy Kumar Dey, Sara Tombelli, Arpan Roy, Palas Biswas, Ambra Giannetti, Nandini Basumallick, Francesco Baldini, Somnath Bandyopadhyay and Cosimo Trono
Sensors 2022, 22(8), 2965; https://doi.org/10.3390/s22082965 - 12 Apr 2022
Cited by 2 | Viewed by 1488
Abstract
A new methodology to enhance the sensitivity of a long period fiber grating sensor (LPFG) at the Turn Around Point (TAP) is here presented. The LPFG sensor has been fabricated by etching the fiber up to 20.4 µm, until the sidelobes of dispersed [...] Read more.
A new methodology to enhance the sensitivity of a long period fiber grating sensor (LPFG) at the Turn Around Point (TAP) is here presented. The LPFG sensor has been fabricated by etching the fiber up to 20.4 µm, until the sidelobes of dispersed LP0,2 cladding mode appeared near TAP in aqueous medium. The dual peak sensitivity of the sidelobes was found to be 16,044 nm/SRIU (surrounding refractive index units) in the RI range from 1.333 to 1.3335. Full article
(This article belongs to the Special Issue Innovative Photonic and Microwave Sensing Approaches and Their Applications)
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14 pages, 1478 KiB  
Article
Scattered Far-Field Sampling in Multi-Static Multi-Frequency Configuration
by Maria Antonia Maisto, Mehdi Masoodi, Giovanni Leone, Raffaele Solimene and Rocco Pierri
Sensors 2021, 21(14), 4724; https://doi.org/10.3390/s21144724 - 10 Jul 2021
Cited by 6 | Viewed by 1869
Abstract
This paper deals with an inverse scattering problem under a linearized scattering model for a multi-static/multi-frequency configuration. The focus is on the determination of a sampling strategy that allows the reduction of the number of measurement points and frequencies and at the same [...] Read more.
This paper deals with an inverse scattering problem under a linearized scattering model for a multi-static/multi-frequency configuration. The focus is on the determination of a sampling strategy that allows the reduction of the number of measurement points and frequencies and at the same time keeping the same achievable performance in the reconstructions as for full data acquisition. For the sake of simplicity, a 2D scalar geometry is addressed, and the scattered far-field data are collected. The relevant scattering operator exhibits a singular value spectrum that abruptly decays (i.e., a step-like behavior) beyond a certain index, which identifies the so-called number of degrees of freedom (NDF) of the problem. Accordingly, the sampling strategy is derived by looking for a discrete finite set of data points for which the arising semi-discrete scattering operator approximation can reproduce the most significant part of the singular spectrum, i.e., the singular values preceding the abrupt decay. To this end, the observation variables are suitably transformed so that Fourier-based arguments can be used. The arising sampling grid returns several data that is close to the NDF. Unfortunately, the resulting data points (in the angle-frequency domain) leading to a complicated measurement configuration which requires collecting the data at different spatial positions for each different frequency. To simplify the measurement configuration, a suboptimal sampling strategy is then proposed which, by an iterative procedure, enforces the sampling points to belong to a rectangular grid in the angle-frequency domain. As a result of this procedure, the overall data points (i.e., the couples angle-frequency) actually increase but the number of different angles and frequencies reduce and lead to a measurement configuration that is more practical to implement. A few numerical examples are included to check the proposed sampling scheme. Full article
(This article belongs to the Special Issue Innovative Photonic and Microwave Sensing Approaches and Their Applications)
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Other

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15 pages, 16002 KiB  
Letter
Polarization-Sensitive and Wide Incidence Angle-Insensitive Fabry–Perot Optical Cavity Bounded by Two Metal Grating Layers
by Jehwan Hwang, Zahyun Ku, Jiyeon Jeon, Yeongho Kim, Deok-Kee Kim, Eun Kyu Kim and Sang Jun Lee
Sensors 2020, 20(18), 5382; https://doi.org/10.3390/s20185382 - 20 Sep 2020
Cited by 2 | Viewed by 3348
Abstract
Infrared (IR) polarimetric imaging has attracted attention as a promising technology in many fields. Generally, superpixels consisting of linear polarizer elements at different angles plus IR imaging array are used to obtain the polarized target signature by using the detected polarization-sensitive intensities. However, [...] Read more.
Infrared (IR) polarimetric imaging has attracted attention as a promising technology in many fields. Generally, superpixels consisting of linear polarizer elements at different angles plus IR imaging array are used to obtain the polarized target signature by using the detected polarization-sensitive intensities. However, the spatial arrangement of superpixels across the imaging array may lead to an incorrect polarimetric signature of a target, due to the range of angles from which the incident radiation can be collected by the detector. In this article, we demonstrate the effect of the incident angle on the polarization performance of an alternative structure where a dielectric layer is inserted between the nanoimprinted subwavelength grating layers. The well-designed spacer creates the Fabry–Perot cavity resonance, and thereby, the intensity of transverse-magnetic I-polarized light transmitted through two metal grating layers is increased as compared with a single-layer metal grating, whereas transverse-electric (TE)-transmitted light intensity is decreased. TM-transmittance and polarization extinction ratio (PER) of normally incident light of wavelength 4.5 μm are obtained with 0.49 and 132, respectively, as the performance of the stacked subwavelength gratings. The relative change of the PERs for nanoimprint-lithographically fabricated double-layer grating samples that are less than 6% at an angle of incidence up to 25°, as compared to the normal incidence. Our work can pave the way for practical and efficient polarization-sensitive elements, which are useful for many IR polarimetric imaging applications. Full article
(This article belongs to the Special Issue Innovative Photonic and Microwave Sensing Approaches and Their Applications)
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