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Acoustic leaky-wave antennas (ALWAs) have demonstrated the capacity to steer directive sound waves in frequency-dependent directions, due to the inherent dispersive radiation characteristic of leaky modes. Compared to more conventional uniform linear array (ULA) acoustic traducers for electronic beam steering (which rely on multiple sensors), the ALWA allows for single microphone operation. Thus, ALWAs offer a direct mechanism to scan a directive acoustic beam in the angular space by simply sweeping the operating frequency of the acoustic signal, which envisions cost-efficient single-transducer direction finders for SONAR applications. In this paper, we study for the first time some important features of an ALWA for acoustic underwater Direction-of-Arrival (DoA) estimation applications. First, we report for the first time on the necessity to shape the radiated ALWA beams in both far- and near-field zones to improve the DoA estimation performance, following similar techniques recently applied for low-cost frequency-scanned direction-finding radars based on LWAs. Furthermore, the capacity to reduce the Side Lobe Level (SLL) has been analyzed in order to improve performance, demonstrating aperture tapering techniques to the ALWA for the first time. These acoustic behaviour aspects have a considerable interest in real applications of ALWA in innovative SONAR systems for underwater scenarios.
Ivan Felis-Enguix; Jorge Otero-Vega; María Campo-Valera; Isidro Villó-Pérez; J. L. Gómez-Tornero. Practical Aspects of Acoustic Leaky-Wave Antennas Applied to Underwater Direction Finding. Proceedings of 7th International Electronic Conference on Sensors and Applications 2020, 2, 93 .
AMA StyleIvan Felis-Enguix, Jorge Otero-Vega, María Campo-Valera, Isidro Villó-Pérez, J. L. Gómez-Tornero. Practical Aspects of Acoustic Leaky-Wave Antennas Applied to Underwater Direction Finding. Proceedings of 7th International Electronic Conference on Sensors and Applications. 2020; 2 (1):93.
Chicago/Turabian StyleIvan Felis-Enguix; Jorge Otero-Vega; María Campo-Valera; Isidro Villó-Pérez; J. L. Gómez-Tornero. 2020. "Practical Aspects of Acoustic Leaky-Wave Antennas Applied to Underwater Direction Finding." Proceedings of 7th International Electronic Conference on Sensors and Applications 2, no. 1: 93.
A full chain simulation of the acoustic hadrontherapy monitoring for brain tumours is presented in this work. For the study, a proton beam of 100 MeV is considered. In the first stage, Geant4 is used to simulate the energy deposition and to study the behaviour of the Bragg peak. The energy deposition in the medium produces local heating that can be considered instantaneous with respect to the hydrodynamic time scale producing a sound pressure wave. The resulting thermoacoustic signal has been subsequently obtained by solving the thermoacoustic equation. The acoustic propagation has been simulated by FEM methods in the brain and the skull, where a set of piezoelectric sensors are placed. Last, the final received signals in the sensors have been processed in order to reconstruct the position of the thermal source and, thus, to determine the feasibility and accuracy of acoustic beam monitoring in hadrontherapy.
Jorge Otero; Ivan Felis; Alicia Herrero; José Antonio Diaz Merchan; Miguel Ardid. Bragg Peak Localization with Piezoelectric Sensors for Proton Therapy Treatment. Sensors 2020, 20, 2987 .
AMA StyleJorge Otero, Ivan Felis, Alicia Herrero, José Antonio Diaz Merchan, Miguel Ardid. Bragg Peak Localization with Piezoelectric Sensors for Proton Therapy Treatment. Sensors. 2020; 20 (10):2987.
Chicago/Turabian StyleJorge Otero; Ivan Felis; Alicia Herrero; José Antonio Diaz Merchan; Miguel Ardid. 2020. "Bragg Peak Localization with Piezoelectric Sensors for Proton Therapy Treatment." Sensors 20, no. 10: 2987.
A full chain simulation of the acoustic hadron therapy monitoring for brain tumors is presented in this work. For the study, a proton beam of 100 MeV was considered. In the first stage, Geant4 was used to simulate the energy deposition and to study the behavior of the Bragg peak. The energy deposition in the medium produced local heating that can be considered instantaneous with respect to the hydrodynamic time scale producing a sound pressure wave. The resulting thermoacoustic signal was subsequently obtained by solving the thermoacoustic equation. The acoustic propagation was simulated by the Finite Element Method (FEM) in the brain and the skull, where a set of piezoelectric sensors were placed. Lastly, the final received signals in the sensors were processed in order to reconstruct the position of the thermal source and, thus, to determine the feasibility and accuracy of acoustic beam monitoring in hadron therapy.
Jorge Otero; Ivan Felis; Miguel Ardid; Alicia Herrero; José A. Merchán. Acoustic Bragg Peak Localization in Proton Therapy Treatment: Simulation Studies. Proceedings 2019, 42, 71 .
AMA StyleJorge Otero, Ivan Felis, Miguel Ardid, Alicia Herrero, José A. Merchán. Acoustic Bragg Peak Localization in Proton Therapy Treatment: Simulation Studies. Proceedings. 2019; 42 (1):71.
Chicago/Turabian StyleJorge Otero; Ivan Felis; Miguel Ardid; Alicia Herrero; José A. Merchán. 2019. "Acoustic Bragg Peak Localization in Proton Therapy Treatment: Simulation Studies." Proceedings 42, no. 1: 71.
Hadrontherapy has been constantly evolving in leaps and bounds since the 1950s, when the use of heavy particles was proposed as an alternative treatment to radiotherapy with gamma rays or electrons. The main objective of this treatment is to maximize the dose applied to the tumour, avoiding damage to the surrounding tissue. One of the keys to the success of hadrontherapy is to achieve instantaneous monitoring of the energy deposition in the environment. Since energy deposition leads to the generation of a thermoacoustic pulse, acoustic technologies have been tested with successful results. However, for this purpose, it is essential to increase the sensitivity of the sensors for the acoustical signal and, therefore, to optimize their geometry as a function of the beam that would be used. We have studied a PTZ material in volumetric and surface volumes through experimental measures and FEM methods. In this text, we start with numerical studies which determine the dependence of the thermoacoustic signal frequency with the energy and duration of the hadron beam.
Jorge Otero; Ivan Felis. Geometrical Parametrization of Piezoelectric Sensors for Acoustical Monitoring in Hadrontherapy. Proceedings 2019, 42, 73 .
AMA StyleJorge Otero, Ivan Felis. Geometrical Parametrization of Piezoelectric Sensors for Acoustical Monitoring in Hadrontherapy. Proceedings. 2019; 42 (1):73.
Chicago/Turabian StyleJorge Otero; Ivan Felis. 2019. "Geometrical Parametrization of Piezoelectric Sensors for Acoustical Monitoring in Hadrontherapy." Proceedings 42, no. 1: 73.
The reuse of shipping containers in architecture has grown in global popularity. However, few studies focus on understanding its thermodynamic behavior. The present study addresses, through numerical simulations, the transitory behavior of a typical house built with containers under different climates, both cold and warm. We examined container with different build construction and observed their effect, from completely naked to those that are coated with materials of different insulation and thermal inertia. Additionally, orientation and other design resources, such as height with respect to the ground, shadow elements, and the position of the windows, were considered. With all these multiparametric studies, quantitative conclusions were obtained that can be considered in design.
Ivan Felis Enguix; Jorge Otero Vega; Sina Ellesser. Numerical Performance of Thermodynamic Behavior of Shipping-Container Architecture. Proceedings 2019, 44, 9 .
AMA StyleIvan Felis Enguix, Jorge Otero Vega, Sina Ellesser. Numerical Performance of Thermodynamic Behavior of Shipping-Container Architecture. Proceedings. 2019; 44 (1):9.
Chicago/Turabian StyleIvan Felis Enguix; Jorge Otero Vega; Sina Ellesser. 2019. "Numerical Performance of Thermodynamic Behavior of Shipping-Container Architecture." Proceedings 44, no. 1: 9.
Hadrontherapy makes it possible to deliver high doses of energy to cancerous tumors by using the large energy deposition in the Bragg-peak. However, uncertainties in the patient positioning and/or in the anatomical parameters can cause distortions in the calculation of the dose distribution. In order to maximize the effectiveness of heavy particle treatments, an accurate monitoring system of the deposited dose depending on the energy, beam time, and spot size is necessary. The localized deposition of this energy leads to the generation of a thermoacoustic pulse that can be detected using acoustic technologies. This article presents different experimental and simulation studies of the acoustic localization of thermoacoustic pulses captured with a set of sensors around the sample. In addition, numerical simulations have been done where thermo-acoustic pulses are emitted for the specific case of a proton beam of 100 MeV.
Jorge Otero; Ivan Felis; Miguel Ardid; Alicia Herrero. Acoustic Localization of Bragg Peak Proton Beams for Hadrontherapy Monitoring. Sensors 2019, 19, 1971 .
AMA StyleJorge Otero, Ivan Felis, Miguel Ardid, Alicia Herrero. Acoustic Localization of Bragg Peak Proton Beams for Hadrontherapy Monitoring. Sensors. 2019; 19 (9):1971.
Chicago/Turabian StyleJorge Otero; Ivan Felis; Miguel Ardid; Alicia Herrero. 2019. "Acoustic Localization of Bragg Peak Proton Beams for Hadrontherapy Monitoring." Sensors 19, no. 9: 1971.
The impulse response of a piezoelectric transducer can be calculated using the electrical equivalent circuit model with the Manson method for bandwidth transducers. Nevertheless, these approaches are not sufficiently precise because the importance of the homogeneous structure medium where the transducer emits the signal in part determines the bandwidth in which it acts due to the medium interactions with the environment. This paper describes preliminary research results on piezoelectric impulse response measurements in a small space, making use of the procedure presented by Angelo Farina for transducers emitting in reverberant spaces. Combining the basics of the exponential sine sweep (ESS) method, techniques of arrival detection, and signal processing it is possible to obtain the impulse response in a piezoelectric transducer emitting in a homogeneous medium.
Jorge Otero; Ivan Felis. Measurement Transducer Impulse Response Using an Exponential Sine Sweep Method. Proceedings 2018, 4, 53 .
AMA StyleJorge Otero, Ivan Felis. Measurement Transducer Impulse Response Using an Exponential Sine Sweep Method. Proceedings. 2018; 4 (1):53.
Chicago/Turabian StyleJorge Otero; Ivan Felis. 2018. "Measurement Transducer Impulse Response Using an Exponential Sine Sweep Method." Proceedings 4, no. 1: 53.
The purpose of this project was to design and implement an autonomous system based on Arduino to monitor environmental parameters that intervene in the perception of human comfort such as temperature, humidity, and solar radiation, and use them to analyze factors related to climate control and energy efficiency in buildings. The system was tested in laboratory conditions as well as by in situ measurements of building elements and living spaces. Some of the experiments carried out were contrasted with numerical simulations that allowed us to understand the implemented system.
María De Castro; Ivan Felis; Constantino Torregrosa; Jorge Otero; Sina Ellesser. Design of an Open-Source Monitoring System for Thermodynamic Analysis of Buildings and Systems. Proceedings 2018, 4, 54 .
AMA StyleMaría De Castro, Ivan Felis, Constantino Torregrosa, Jorge Otero, Sina Ellesser. Design of an Open-Source Monitoring System for Thermodynamic Analysis of Buildings and Systems. Proceedings. 2018; 4 (1):54.
Chicago/Turabian StyleMaría De Castro; Ivan Felis; Constantino Torregrosa; Jorge Otero; Sina Ellesser. 2018. "Design of an Open-Source Monitoring System for Thermodynamic Analysis of Buildings and Systems." Proceedings 4, no. 1: 54.
Hadrontherapy makes it possible to deliver high doses of energy to cancerous tumors by using the large energy deposition in the Bragg-peak. However, uncertainties in the patient positioning and or in the anatomical parameters can cause distortions in the calculation of the dose distribution. In order to maximize the effectiveness of heavy particle treatments, an accurate monitoring system of the deposited dose depending on the energy, the beam time, and the spot size is necessary. The localized deposition of this energy leads to the generation of a thermoacoustic pulse that can be detected using acoustic technologies. This article presents different experimental and simulation studies of the acoustic localization of thermoacoustic pulses by generating similar signals that have been captured with a set of sensors around the samples. In addition, numerical simulations have been done where thermoacoustic pulses are emitted for the specific case of a proton beam of 100 MeV.
Jorge Otero; Miguel Ardid; Ivan Felis; Alicia Herrero. Acoustic Location of Bragg Peak for Hadrontherapy Monitoring. Proceedings 2018, 4, 6 .
AMA StyleJorge Otero, Miguel Ardid, Ivan Felis, Alicia Herrero. Acoustic Location of Bragg Peak for Hadrontherapy Monitoring. Proceedings. 2018; 4 (1):6.
Chicago/Turabian StyleJorge Otero; Miguel Ardid; Ivan Felis; Alicia Herrero. 2018. "Acoustic Location of Bragg Peak for Hadrontherapy Monitoring." Proceedings 4, no. 1: 6.