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Special Issue "State-of-the-Art Sensors Technology in Portugal"

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

Deadline for manuscript submissions: closed (15 February 2012)

Special Issue Editors

Guest Editor
Dr. Orlando Frazão

INESC Porto, Rua do Campo Alegre, 687, 4169 007 Porto, Portugal
Website | E-Mail
Phone: +351226082061
Interests: optical sensors; physical sensors; smart structures; remote and distributed sensors
Guest Editor
Dr. Pedro A. S. Jorge

INESC Porto, Rua do Campo Alegre, 687, 4169 007 Porto, Portugal
Website | E-Mail
Phone: +351220402301
Interests: optical fiber sensors; biosensors; chemical sensors; fluorescence spectroscopy; quantum dots; interferometry; environmental monitoring

Keywords

  • biosensors
  • chemical sensors
  • physical sensors
  • remote sensing sensors

Published Papers (8 papers)

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Research

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Open AccessArticle Optical Fiber Relative Humidity Sensor Based on a FBG with a Di-Ureasil Coating
Sensors 2012, 12(7), 8847-8860; doi:10.3390/s120708847
Received: 28 May 2012 / Revised: 20 June 2012 / Accepted: 25 June 2012 / Published: 27 June 2012
Cited by 25 | PDF Full-text (599 KB) | HTML Full-text | XML Full-text
Abstract
In this work we proposed a relative humidity (RH) sensor based on a Bragg grating written in an optical fiber, associated with a coating of organo-silica hybrid material prepared by the sol-gel method. The organo-silica-based coating has a strong adhesion to the optical
[...] Read more.
In this work we proposed a relative humidity (RH) sensor based on a Bragg grating written in an optical fiber, associated with a coating of organo-silica hybrid material prepared by the sol-gel method. The organo-silica-based coating has a strong adhesion to the optical fiber and its expansion is reversibly affected by the change in the RH values (15.0–95.0%) of the surrounding environment, allowing an increased sensitivity (22.2 pm/%RH) and durability due to the presence of a siliceous-based inorganic component. The developed sensor was tested in a real structure health monitoring essay, in which the RH inside two concrete blocks with different porosity values was measured over 1 year. The results demonstrated the potential of the proposed optical sensor in the monitoring of civil engineering structures. Full article
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Portugal)
Open AccessArticle An Intelligent Sensor Array Distributed System for Vibration Analysis and Acoustic Noise Characterization of a Linear Switched Reluctance Actuator
Sensors 2012, 12(6), 7614-7633; doi:10.3390/s120607614
Received: 15 May 2012 / Revised: 1 June 2012 / Accepted: 1 June 2012 / Published: 7 June 2012
PDF Full-text (1111 KB) | HTML Full-text | XML Full-text
Abstract
This paper proposes a distributed system for analysis and monitoring (DSAM) of vibrations and acoustic noise, which consists of an array of intelligent modules, sensor modules, communication bus and a host PC acting as data center. The main advantages of the DSAM are
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This paper proposes a distributed system for analysis and monitoring (DSAM) of vibrations and acoustic noise, which consists of an array of intelligent modules, sensor modules, communication bus and a host PC acting as data center. The main advantages of the DSAM are its modularity, scalability, and flexibility for use of different type of sensors/transducers, with analog or digital outputs, and for signals of different nature. Its final cost is also significantly lower than other available commercial solutions. The system is reconfigurable, can operate either with synchronous or asynchronous modes, with programmable sampling frequencies, 8-bit or 12-bit resolution and a memory buffer of 15 kbyte. It allows real-time data-acquisition for signals of different nature, in applications that require a large number of sensors, thus it is suited for monitoring of vibrations in Linear Switched Reluctance Actuators (LSRAs). The acquired data allows the full characterization of the LSRA in terms of its response to vibrations of structural origins, and the vibrations and acoustic noise emitted under normal operation. The DSAM can also be used for electrical machine condition monitoring, machine fault diagnosis, structural characterization and monitoring, among other applications. Full article
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Portugal)
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Open AccessArticle Dynamic Structural Health Monitoring of Slender Structures Using Optical Sensors
Sensors 2012, 12(5), 6629-6644; doi:10.3390/s120506629
Received: 26 March 2012 / Revised: 23 April 2012 / Accepted: 27 April 2012 / Published: 18 May 2012
Cited by 9 | PDF Full-text (525 KB) | HTML Full-text | XML Full-text
Abstract
In this paper we summarize the research activities at the Instituto de Telecomunicações—Pólo de Aveiro and University of Aveiro, in the field of fiber Bragg grating based sensors and their applications in dynamic measurements for Structural Health Monitoring of slender structures such as
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In this paper we summarize the research activities at the Instituto de Telecomunicações—Pólo de Aveiro and University of Aveiro, in the field of fiber Bragg grating based sensors and their applications in dynamic measurements for Structural Health Monitoring of slender structures such as towers. In this work we describe the implementation of an optical biaxial accelerometer based on fiber Bragg gratings inscribed on optical fibers. The proof-of-concept was done with the dynamic monitoring of a reinforced concrete structure and a slender metallic telecommunication tower. Those structures were found to be suitable to demonstrate the feasibility of FBG accelerometers to obtain the structures’ natural frequencies, which are the key parameters in Structural Health Monitoring and in the calibration of numerical models used to simulate the structure behavior. Full article
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Portugal)
Open AccessArticle Sensor Integration in a Low Cost Land Mobile Mapping System
Sensors 2012, 12(3), 2935-2953; doi:10.3390/s120302935
Received: 29 January 2012 / Revised: 16 February 2012 / Accepted: 23 February 2012 / Published: 2 March 2012
Cited by 9 | PDF Full-text (812 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Mobile mapping is a multidisciplinary technique which requires several dedicated equipment, calibration procedures that must be as rigorous as possible, time synchronization of all acquired data and software for data processing and extraction of additional information. To decrease the cost and complexity of
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Mobile mapping is a multidisciplinary technique which requires several dedicated equipment, calibration procedures that must be as rigorous as possible, time synchronization of all acquired data and software for data processing and extraction of additional information. To decrease the cost and complexity of Mobile Mapping Systems (MMS), the use of less expensive sensors and the simplification of procedures for calibration and data acquisition are mandatory features. This article refers to the use of MMS technology, focusing on the main aspects that need to be addressed to guarantee proper data acquisition and describing the way those aspects were handled in a terrestrial MMS developed at the University of Porto. In this case the main aim was to implement a low cost system while maintaining good quality standards of the acquired georeferenced information. The results discussed here show that this goal has been achieved. Full article
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Portugal)
Open AccessArticle LOLS Research in Technology for the Development and Application of New Fiber-Based Sensors
Sensors 2012, 12(3), 2654-2666; doi:10.3390/s120302654
Received: 4 January 2012 / Revised: 9 February 2012 / Accepted: 22 February 2012 / Published: 28 February 2012
Cited by 5 | PDF Full-text (473 KB) | HTML Full-text | XML Full-text
Abstract
This paper presents the research made at the Laboratory of Optics, Lasers and Systems (LOLS) of the Faculty of Sciences of University of Lisbon, Portugal, in the field of fiber-based sensors. Three areas are considered: sensor encapsulation for natural aqueous environments, refractive index
[...] Read more.
This paper presents the research made at the Laboratory of Optics, Lasers and Systems (LOLS) of the Faculty of Sciences of University of Lisbon, Portugal, in the field of fiber-based sensors. Three areas are considered: sensor encapsulation for natural aqueous environments, refractive index modulation and laser micropatterning. We present the main conclusions on the issues and parameters to take in consideration for the encapsulation process and results of its design and application. Mid-infrared laser radiation was applied to produce long period fiber gratings and nanosecond pulses of near-infrared Q-switch laser were used for micropatterning. Full article
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Portugal)
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Review

Jump to: Research

Open AccessReview Optical Sensors Based on Plastic Fibers
Sensors 2012, 12(9), 12184-12207; doi:10.3390/s120912184
Received: 12 June 2012 / Revised: 28 July 2012 / Accepted: 28 August 2012 / Published: 5 September 2012
Cited by 68 | PDF Full-text (517 KB) | HTML Full-text | XML Full-text
Abstract
The recent advances of polymer technology allowed the introduction of plastic optical fiber in sensor design. The advantages of optical metrology with plastic optical fiber have attracted the attention of the scientific community, as they allow the development of low-cost or cost competitive
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The recent advances of polymer technology allowed the introduction of plastic optical fiber in sensor design. The advantages of optical metrology with plastic optical fiber have attracted the attention of the scientific community, as they allow the development of low-cost or cost competitive systems compared with conventional technologies. In this paper, the current state of the art of plastic optical fiber technology will be reviewed, namely its main characteristics and sensing advantages. Several measurement techniques will be described, with a strong focus on interrogation approaches based on intensity variation in transmission and reflection. The potential applications involving structural health monitoring, medicine, environment and the biological and chemical area are also presented. Full article
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Portugal)
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Open AccessReview Fiber Optic-Based Refractive Index Sensing at INESC Porto
Sensors 2012, 12(6), 8371-8389; doi:10.3390/s120608371
Received: 2 May 2012 / Revised: 4 June 2012 / Accepted: 6 June 2012 / Published: 18 June 2012
Cited by 10 | PDF Full-text (430 KB) | HTML Full-text | XML Full-text
Abstract
A review of refractive index measurement based on different types of optical fiber sensor configurations and techniques is presented. It addresses the main developments in the area, with particular focus on results obtained at INESC Porto, Portugal. The optical fiber sensing structures studied
[...] Read more.
A review of refractive index measurement based on different types of optical fiber sensor configurations and techniques is presented. It addresses the main developments in the area, with particular focus on results obtained at INESC Porto, Portugal. The optical fiber sensing structures studied include those based on Bragg and long period gratings, on micro-interferometers, on plasmonic effects in fibers and on multimode interference in a large spectrum of standard and microstructured optical fibers. Full article
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Portugal)
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Open AccessReview Optical Triangulation-Based Microtopographic Inspection of Surfaces
Sensors 2012, 12(4), 4399-4420; doi:10.3390/s120404399
Received: 21 February 2012 / Revised: 22 March 2012 / Accepted: 28 March 2012 / Published: 29 March 2012
Cited by 10 | PDF Full-text (1823 KB) | HTML Full-text | XML Full-text
Abstract
The non-invasive inspection of surfaces is a major issue in a wide variety of industries and research laboratories. The vast and increasing range of surface types, tolerance requirements and measurement constraints demanded during the last decades represents a major research effort in the
[...] Read more.
The non-invasive inspection of surfaces is a major issue in a wide variety of industries and research laboratories. The vast and increasing range of surface types, tolerance requirements and measurement constraints demanded during the last decades represents a major research effort in the development of new methods, systems and metrological strategies. The discreet dimensional evaluation the rugometric characterization and the profilometric inspection seem to be insufficient in many instances. The full microtopographic inspection has became a common requirement. Among the different systems developed, optical methods have the most important role and among those triangulation-based ones have gained a major status thanks to their flexibility, reliability and robustness. In this communication we will provide a brief historical review on the development of optical triangulation application to the dimensional inspection of objects and surfaces and on the work done at the Microtopography Laboratory of the Physics Department of the University of Minho, Portugal, in the development of methods and systems of optical triangulation-based microtopographic inspection of surfaces. Full article
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Portugal)
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