Papers by Carlos Alberto Rinaldi
Laser Induced Breakdown Spectroscopy (LIBS)
Proceedings IMCS 2018, 2018
In this work a sensor system was developed with the aim of measuring the composition of gases bas... more In this work a sensor system was developed with the aim of measuring the composition of gases based on optical principles. For this purpose, the system is composed by a metal oxide thin film deposited on a glass substrate. Microfabrication techniques present in our facilities, such as photolithography and sputtering, were used. The glass substrate with the thin films was mounted in a closed chamber designed by our own, with controlled temperature and light sources. When gaseous samples are injected in the chamber, the adsorption of the sample on the thin films alters the spectrum of light absorption of the film. A photo-camera was positioned above the glass substrate in order to register the luminosity changes. In this way, changes in the intensity of the illuminated surface are produced. Then, the pixel pattern of the images, by illuminating the camera with the sensor, contains the desired information. Different image processing techniques and pattern recognition analysis were used to analyze the images. Tests were performed with mixtures of dry and wet air and CO 2. The results obtained indicate that the sensor allows the separation of the analyzed samples.
Proyecciones, Vol.12 No.1, 11-26. (2014), Apr 1, 2014
Se desarrolló una nariz electrónica (NE) con algoritmos de procesamiento y hardware completo. Est... more Se desarrolló una nariz electrónica (NE) con algoritmos de procesamiento y hardware completo. Este nuevo instrumento denominado "Patagonia" permitió identificar olores. Mediante métodos analíticos y criterios propios de adquisición y análisis de señales, se implementaron algoritmos de reconocimiento de muestras. Se utilizó Transformada Onditas, Análisis de Componentes Principales, Análisis discriminatorios lineales y cuadráticos, Redes neuronales y análisis de las constantes de desorción de los com¬puestos. Se desarrolló un software con interfaz de usuario simple para poder proveer narices electrónicas comerciales. Se midieron distintas muestras de café, aceites y jugos entre otros alimentos. Se discriminaron correctamente las muestras obteniendo resultados satisfactorios.
Tecnura: Tecnología y Cultura Afirmando el Conocimiento, 2020
Objective: Volcanic eruptions are a serious threat to the environment. In order to assess more ac... more Objective: Volcanic eruptions are a serious threat to the environment. In order to assess more accurately the state of a volcanic zone, spatially distributed measurements are required. Methodology: An electronic nose (eNose), a quadcopter drone with gas, temperature, and humidity sensors was developed. The drone was assembled with 3D printed parts and tested for properties like structural rigidity. The eNose samples gases, manages a sensor array, acquires data, extracts features, and classifies them with suitable classification algorithms. Results: The eNose drone system provides a versatile technology for autonomous monitoring of diverse environments. A logarithmic calibration curve was observed for the CO sensor. Conclusions: The implementation of a eNose drone system and its application to the detection and study of gases in volcanic areas would be innovative in Argentina. The system can access remote dangerous areas and is versatile. Different gas sensors like H 2 S or SO 2 can be added.
ECS Meeting Abstracts, 2021
Introduction Volcanic eruptions are a serious threat to the environment. The volcanic ash can con... more Introduction Volcanic eruptions are a serious threat to the environment. The volcanic ash can contaminate water, vegetation, livestock and people. The Andes or Andean Mountains are the longest continental mountain range in the world, with a length of 8500 km. and presents different volcanoes [1]. In our work group the gas emissions of the Peteroa volcano are analyzed. In order to assess more accurately the state of a volcanic zone, spatially distributed measurements are required. Consequently, it is necessary to have an unmanned aerial vehicle to obtain several measurement points. An Electronic Nose (eNose) and a quadcopter drone equipped with gas sensors for CO2, temperature and humidity were developed [2][3]. The Dron eNose system provides a versatile technology for autonomous monitoring of diverse environments. The use of this device minimizes the risks of exposure to dangerous compounds for people and allows exploring inaccessible areas. The advantage of this system, over drones...
ECS Meeting Abstracts, 2021
This paper presents the fabrication and characterization of a sensor based on a nanostructured Cu... more This paper presents the fabrication and characterization of a sensor based on a nanostructured CuO thin film on a silicon substrate. We evaluated the sensitivity and selectivity of the sensor to ethyl or isopropyl alcohol at room temperature in the absence and presence of green light. Measurements of sensor responses on both light conditions show repetitive changes in selectivity, presumably based on sustancial changes in chemical interactions of analyte with excited nano-structured CuO thin film.
Many nuclear plants exceed their lifetimes, have obsolete security systems and cannot be consider... more Many nuclear plants exceed their lifetimes, have obsolete security systems and cannot be considered failsafe. In this work the implementation of an intelligent system of telemetry and control is proposed to improve security at nuclear plants. These systems can be added to current systems or replace the existing ones. With simple remote sensing devices, low cost, easy installation and wireless communication or wiring, depending on the control area, security at nuclear plants can be improved. Remote devices, fixed and mobile, send information to a central computer with an intelligent control system. The mobile devices, using suitable algorithms will move and seek greater risk areas: high levels of radiation, high concentrations of contaminants or explosive gases, high temperatures, presence in prohibited zones, etc. Devices more sophisticated such as cameras and audio acquisition systems can also be implemented. The central computer will process the data using regression algorithms, pattern recognition and artificial intelligence. These algorithms have intelligent learning, detecting risks and generating alerts in real time. The learning system interacts with the operator to establish optimum processing parameters, rejecting false alarms. Simple graphics were used to display the current state of the plant and trend graphs to predict accidents. Also, mobile devices may be carried by the operator, by a simple and small robot or by a conveyor belt. The devices will be strategically located in confined spaces and highly dangerous areas to monitor the machines. These implementations will reduce the risk of accidents and improve preventive maintenance of nuclear plants.
2017 ISOCS/IEEE International Symposium on Olfaction and Electronic Nose (ISOEN)
The objective of this work is to improve the electronic nose (e-nose) response to detect the pres... more The objective of this work is to improve the electronic nose (e-nose) response to detect the presence of Triatoma infestans, commonly named “vinchuca”, transmitters of Trypanosoma cruzi, agent of the Chagas disease (ECh). An electronic nose developed in our own laboratory, with 8 commercial MOX type SnO2 sensors, was used. Different reference gases used in the purging of the e-nose sensors chamber were analyzed. The samples analyzed consisted of pieces of filter paper placed in contact with individuals of Triatoma infestans during 168 hours. After removing the insects, the samples were irradiated with UV laser to increase the intensity of the measured signals. Notable improvements in the amplitude of the sensors signals were obtained using N2 as reference gas in combination with UV laser irradiation.
Science Advances, 2021
Polymer-coated nanoparticles in synovial fluid and hyaluronic acid solutions diffuse faster than ... more Polymer-coated nanoparticles in synovial fluid and hyaluronic acid solutions diffuse faster than expected based on bulk viscosity.
Proceedings IMCS 2012, 2012
CuO nanowires (NWs) based sensors were fabricated and characterized. Cuo NWs were synthesized by ... more CuO nanowires (NWs) based sensors were fabricated and characterized. Cuo NWs were synthesized by thermal oxidation and deposited onto gold electrodes. The sensing layer was morphologically characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showing a monocrystalline structure for CuO NWs. At room temperature these sensors exhibited a non-linear I-V response and showed sensitivity to different concentrations of ethanol. Results are important for low cost and low power consumption gas sensor fabrication.
Sensors and Actuators B: Chemical, 2018
The aim of this work is to implement a laboratory analytical procedure based on the selective det... more The aim of this work is to implement a laboratory analytical procedure based on the selective detection of the volatile compound with Laser Vaporization electronic nose technique (LV e-Nose), with the purpose of distinguish between triatomines of different sex and development stage, transmitters of Trypanosoma cruzi, agent of the Chagas disease (ECh). A chemometric method based on Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA) was performed in order to analyze the data coming from the e-Nose. The results allowed distinguishing between male, female and nympha stages, according to their volatile emissions. The proposed methodology resulted cost-effective, has good sensitivity, acceptability and improve the effectiveness. Although a greater number of samples must be analyzed, our results provide new interesting clues as a proof of concept to advance in the operational research for the surveillance of the ECh. Therefore, it could contribute to the sustainability and coverage of control programs in scenarios of the low density of vectors (interruption of transmission step).
Nuclear Technology, 2017
Abstract This work presents the effects that produce the change in entropy during separation proc... more Abstract This work presents the effects that produce the change in entropy during separation processes; it takes into account the dilution of UF6 in a carrier gas (H2, He, N2, Ar, Xe, SF6, etc.). Comparisons were made between two technologies: one a mature process currently used, i.e., centrifugation (process A), and the other in development, i.e., processes based on a laser [Condensation Repression Isotope Separation by Laser (CRISLA), Molecular Laser Isotope Separation (MLIS), etc.] (process B). The calculations were made using the principles of mix thermodynamics. The results indicate that entropy expenditure is two orders of magnitude higher than that necessary to separate isotopes when the amount (of isotopes) is the same in both process A and process B.
Anales AFA, 2018
En este trabajo se presenta la implementación de un interferómetro de Nomarsky diseñado para medi... more En este trabajo se presenta la implementación de un interferómetro de Nomarsky diseñado para medir el impulso específico de combustibles utilizados en sistemas de propulsión por ablación láser. En primer lugar se validó la técnica con combustibles conocidos. Posteriormente, se aplicó a la medición del impulso específico de combustibles binarios metal/sal desarrollados por nuestro grupo de investigación [1]. Esto permitió a su vez, determinar la eficiencia de dichos combustibles.
Proceedings IMCS 2012, 2012
Gas sensors TiO2 based were prepared by anodic oxidation method. The morphology of the TiO2 nanos... more Gas sensors TiO2 based were prepared by anodic oxidation method. The morphology of the TiO2 nanostructures were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD) and Raman spectroscopy. The gas sensing properties of TiO2 nanotubes exposed CO have been tested in a wide range of operating temperatures. The sensor using the fabricated nanotube arrays as the sensing elements demonstrated a good response to different concentrations of carbon monoxide from 480 to 850 ppm at 350 °C.
J. Anal. At. Spectrom., 2016
The capability of the Corona Discharge Induced Plasma Spectroscopy (CDIPS) technique has been dem... more The capability of the Corona Discharge Induced Plasma Spectroscopy (CDIPS) technique has been demonstrated for quantitative analysis of nitrogen–oxygen mixtures.
Se utilizo la absorcion multifotonica de la radiacion de la linea 10P(48), (10, 91µm) de laser de... more Se utilizo la absorcion multifotonica de la radiacion de la linea 10P(48), (10, 91µm) de laser de CO2 TEA construido en el laboratorio para generar moleculas de CDCL3 vibraciona1mente excitadas en el cuasi-continuo por debajo del umbra1 de reaccion. La desactivacion coligional de las moleculas vibracionalmente excitadas fue estudiada a partir de la fluorescencia infrarroja resuelta el tiempo del modo 2v5 (1492 cm-1). Los rcsu1tados experimentales fueron simulados utilizando un modelo colisional de ecuaciones de velocidad acopladas. Se determinaron valores de energia media transferida en colisiones desactivantes, d, Y su dependencia con la cncrgia de excitacion. Se obtuvieron valores de energia media de excitacion. Se obtuvieron valores entre 70 y 100' cm-l, dependiendo del grado de excitacion molecular.
Se uso un laser de CO2 TEA construido en el laboratorio, sintonizado en la linea 1 OP(48), 10,91m... more Se uso un laser de CO2 TEA construido en el laboratorio, sintonizado en la linea 1 OP(48), 10,91m, para excitar el modo v4 del CDCl3 (914 cm-1). Mediante un filtro gaseoso se aislo la senal de fluorescencia IR emitida por el modo 2v5 del CDCl3 excitado. El analisis de la variacion temporal de dicha senal mediante un metodo de regresion no lineal permitio determinar las constantes de relajacion vibracional. Se estudio la dependencia de la relajacion V-T de la presion de CDCl3 para una dada fluencia de laser. Se determino tambien la dependencia de dicha relajacion de la fluencia del laser para una dada presion del CDCl3. Se estudio tambien la dependencia de la fluencia del laser de la desexcitacion del CDCl3 en presencia de gases no reactivos.
Microsystem Technologies, 2012
... 1929 Storm AJ, Storm C, Chen J, Zandbergen H, Joanny JF, Dekker C (2005) Fast DNA translocati... more ... 1929 Storm AJ, Storm C, Chen J, Zandbergen H, Joanny JF, Dekker C (2005) Fast DNA translocation through a solid-state nanopore. Nano Lett 5(7):1193–1197 Tabeling P (2005) Introduction to microfluidics. Oxford University Press, USA Toro C, Lerner B, Perez MS, Lasorsa ...
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Papers by Carlos Alberto Rinaldi