sensors Volume 2 State-of-the-Art Sensors Technology in Spain 2017 Edited by Gonzalo Pajares Martinsanz Printed Edition of the Special Issue Published in Sensors www.mdpi.com/journal/sensors State-of-the-Art Sensors Technology in Spain 2017 Volume 2 Special Issue Editor Gonzalo Pajares Martinsanz MDPI • Basel • Beijing • Wuhan • Barcelona • Belgrade Special Issue Editor Gonzalo Pajares Martinsanz Department Software Engineering and Artificial Intelligence University Complutense of Madrid Spain Editorial Office MDPI St. Alban‐Anlage 66 Basel, Switzerland This edition is a reprint of the Special Issue published online in the open access journal Sensors (ISSN 1424‐8220) from 2017–2018 (available at: http://www.mdpi.com/journal/sensors/special_issues/SA_sensors_technology_spa in_2017). For citation purposes, cite each article independently as indicated on the article page online and as indicated below: Lastname, F.M.; Lastname, F.M. Article title. Journal Name Year, Article number, page range. First Edition 2018 Volume 2 Volume 1–2 ISBN 978‐3‐03842‐959‐3 (Pbk) ISBN 978‐3‐03842‐961‐6 (Pbk) ISBN 978‐3‐03842‐960‐9 (PDF) ISBN 978‐3‐03842‐962‐3 (PDF) Articles in this volume are Open Access and distributed under the Creative Commons Attribution license (CC BY), which allows users to download, copy and build upon published articles even for commercial purposes, as long as the author and publisher are properly credited, which ensures maximum dissemination and a wider impact of our publications. The book taken as a whole is © 2018 MDPI, Basel, Switzerland, distributed under the terms and conditions of the Creative Commons license CC BY‐NC‐ND (http://creativecommons.org/licenses/by‐nc‐nd/4.0/). Table of Contents About the Special Issue Editor ...................................... vii Preface to ”State-of-the-Art Sensors Technology in Spain 2017” .................. ix Manuel Alvarez-Campana, Gregorio L´opez, Enrique V´azquez, V´ıctor A. Villagr´a and Julio Berrocal Smart CEI Moncloa: An IoT-based Platform for People Flow and Environmental Monitoring on a Smart University Campus doi: 10.3390/s17122856 ......................................... 1 Alberto J. P´erez, Rolando J. Gonz´alez-Pena, ˜ Roberto Braga Jr., Angel´ Perles, Eva P´erez–Mar´ın and Fernando J. Garc´ıa-Diego A Portable Dynamic Laser Speckle System for Sensing Long-Term Changes Caused by Treatments in Painting Conservation doi: 10.3390/s18010190 ......................................... 25 Jonay Toledo, Jose D. Pineiro, ˜ Rafael Arnay, Daniel Acosta and Leopoldo Acosta Improving Odometric Accuracy for an Autonomous Electric Cart doi: 10.3390/s18010200 ......................................... 38 Rafael Socas, Raquel Dormido and Sebasti´an Dormido New Control Paradigms for Resources Saving: An Approach for Mobile Robots Navigation doi: 10.3390/s18010281 ......................................... 53 Jos´e Vicente Lid´on-Roger, Gema Prats-Boluda, Yiyao Ye-Lin, Javier Garcia-Casado and Eduardo Garcia-Breijo Textile Concentric Ring Electrodes for ECG Recording Based on Screen-Printing Technology doi: 10.3390/s18010300 ......................................... 80 Victor Zena-Gim´enez, Javier Garcia-Casado, Yiyao Ye-Lin, Eduardo Garcia-Breijo and Gema Prats-Boluda A Flexible Multiring Concentric Electrode for Non-Invasive Identification of Intestinal Slow Waves doi: 10.3390/s18020396 ......................................... 95 Macarena C. Martinez-Rodriguez, Miguel A. Prada-Delgado, Piedad Brox, and Iluminada Baturone VLSI Design of Trusted Virtual Sensors doi: 10.3390/s18020347 .........................................112 Paloma Merello, Fernando-Juan Garc´ıa-Diego, Pedro Beltr´an and Claudia Scatigno High Frequency Data Acquisition System for Modelling the Impact of Visitors on the Thermo- Hygrometric Conditions of Archaeological Sites: A Casa di Diana (Ostia Antica, Italy) Case Study doi: 10.3390/s18020348 .........................................130 Peio Lopez-Iturri, Erik Aguirre, Jesus ´ Daniel Trigo, Jos´e Javier Astrain, Leyre Azpilicueta, Luis Serrano, Jesus ´ Villadangos and Francisco Falcone Implementation and Operational Analysis of an Interactive Intensive Care Unit within a Smart Health Context doi: 10.3390/s18020389 .........................................145 iii Jesús Morales, Victoria Plaza-Leiva, Anthony Mandow, Jose Antonio Gomez-Ruiz, Javier Ser´onand Alfonso Garc´ıa-Cerezo Analysis of 3D Scan Measurement Distribution with Application to a Multi-Beam Lidar on a Rotating Platform doi: 10.3390/s18020395 .........................................167 Himar Fabelo, Samuel Ortega, Raquel Lazcano, Daniel Madro ˜nal, Gustavo M. Callic´o, Eduardo Ju´arez, Rub´en Salvador, Diederik Bulters, Harry Bulstrode, Adam Szolna, Juan F. Pi ˜neiro,Coralia Sosa, Aruma J. O’Shanahan, Sara Bisshopp, Mar´ıaHern´andez, Jes ´usMorera, Daniele Ravi, B. Ravi Kiran, Aurelio Vega, Abelardo B´aez-Quevedo, Guang-Zhong Yang, Bogdan Stanciulescu and Roberto Sarmiento An Intraoperative Visualization System Using Hyperspectral Imaging to Aid in Brain Tumor Delineation doi: 10.3390/s18020430 .........................................189 Oscar Alvear, Carlos Tavares Calafate, Juan-Carlos Cano and Pietro Manzoni Crowdsensing in Smart Cities: Overview, Platforms, and Environment Sensing Issues doi: 10.3390/s18020460 .........................................210 Jorge Yunta, Daniel Garcia-Pozuelo, Vicente Diaz and Oluremi Olatunbosun A Strain-Based Method to Detect Tires’ Loss of Grip and Estimate Lateral Friction Coefficient from Experimental Data by Fuzzy Logic for Intelligent Tire Development doi: 10.3390/s18020490 .........................................238 Jorge A. D´ıez,Jos´eM. Catal´an,Andrea Blanco, Jos´eV. Garc´ıa-Perez,Francisco J. Badesa and Nicol´asGac´ıa-Aracil Customizable Optical Force Sensor for Fast Prototyping and Cost-Effective Applications doi: 10.3390/s18020493 .........................................257 Juan Aznar-Poveda, Jose Antonio Lopez-Pastor, Antonio-Javier Garcia-Sanchez, Joan Garcia-Haro and Toribio Fern´andezOtero A COTS-Based Portable System to Conduct Accurate Substance Concentration Measurements doi: 10.3390/s18020539 .........................................284 Daniel Garc´ıaIglesias, Nieves Roque ˜niGuti´errez,Francisco Javier De Cos and David Calvo Analysis of the High-Frequency Content in Human QRS Complexes by the Continuous Wavelet Transform: An Automatized Analysis for the Prediction of Sudden Cardiac Death doi: 10.3390/s18020560 .........................................299 Gonzalo Farias, Ernesto Fabregas, Emmanuel Peralta, H´ectorVargas, Gabriel Hermosilla, Gonzalo Garcia and Sebasti´anDormido A Neural Network Approach for Building An Obstacle Detection Model by Fusion of Proximity Sensors Data doi: 10.3390/s18030683 .........................................314 Joaqu´ınGarc´ıa-G´omez,Roberto Gil-Pita, Manuel Rosa-Zurera, Antonio Romero-Camacho, Jes ´usAntonio Jim´enez-Garridoand V´ıctorGarc´ıa-Benavides Smart Sound Processing for Defect Sizing in Pipelines Using EMAT Actuator Based Multi- Frequency Lamb Waves doi: 10.3390/s18030802 .........................................332 Martin Molina, Pedro Frau and Dario Maravall A Collaborative Approach for Surface Inspection Using Aerial Robots and Computer Vision doi: 10.3390/s18030893 .........................................350 iv Carolina Tienda, Jose A. Encinar, Mariano Barba and Manuel Arrebola Dual-Polarization Ku-Band Compact Spaceborne Antenna Based on Dual-Reflectarray Optics doi: 10.3390/s18041100 . 373 v About the Special Issue Editor Gonzalo Pajares Martinsanz received the Ph.D. degree in Physics from Distance University from Spain in 1995, discussing a thesis on stereovision. Since 1988 he worked at Indra in critical real-time software development. He also was working at Indra Space and INTA in advanced image processing for Remote Sensing. He joined the University Complutense of Madrid in 1995 on the Faculty of Informatics (Computer Science) at the Department of Software Engineering and Artificial intelligence. His current research interests include computer and machine visual perception, artificial intelligence, decision making, robotics and simulation with a lot of publications, including several books, on these topics. He is director of the ISCAR Research Group. He is Associated Editor in the indexed journal of Remote Sensing and serves as a member of the Editorial Board in the following indexed journals: Sensors, EURASIP Journal of Image and Video processing, Pattern Analysis and Applications. He is the Editor-in-Chief of Journal of Imaging. vii Preface to ”State-of-the-Art Sensors Technology in Spain 2017” Since 2009 six special issues has been published on sensors and technologies in Spain, where researchers present their successful progress. Forty high quality works have been collected and reproduced on this book, demonstrating significant achievements. They are self-contained works addressing different sensor-based technologies, procedures and applications on several areas with a wide range of devices and useful developments. Readers will also find an excellent source of resources when necessary in the development of his research, teaching or industrial activity. Although the book is focused on sensors and technologies in Spain, it describes worldwide ad- vanced developments and references on the covered topics useful on the contexts addressed. Some works have been or come from international collaborations. Our society is demanding new technologies for data acquisition, processing and transmission