Now showing items 1-20 of 26

    • A self-calibrating closed loop circuit for configurable constant voltage thermal anemometers 

      Gorreta Mariné, Sergio; Barajas Ojeda, Enrique; Kowalski, Lukasz; Atienza García, María Teresa; Domínguez Pumar, Manuel; Jiménez Serres, Vicente (Institution of Electrical Engineers, 2015-09-17)
      Article
      Open Access
    • Active control of the surface potential of nanostructured layers 

      Domínguez Pumar, Manuel; Kowalski, Lukasz; Llobet, E.; Calavia, Raül (2016-01-21)
      Article
      Open Access
      The objective of this letter is to show the first results obtained with a control designed to keep the average surface potential of a nanostructured layerconstant. This condition is equivalent to keeping constant the ...
    • Analyzing the performance of a miniature 3D wind sensor for Mars 

      Domínguez Pumar, Manuel; Kowalski, Lukasz; Jiménez Serres, Vicente; Rodríguez Pérez, Ivette María; Soria Guerrero, Manel; Bermejo Broto, Sandra; Pons Nin, Joan (Multidisciplinary Digital Publishing Institute (MDPI), 2020-10-20)
      Article
      Open Access
      This paper analyzes the behavior of a miniature 3D wind sensor designed for Mars atmosphere. The sensor is a spherical structure of 10 mm diameter divided in four sectors. By setting all the sectors to constant temperature, ...
    • Applications of hot film anemometry to space missions 

      Jiménez Serres, Vicente; Domínguez Pumar, Manuel; Ricart Campos, Jordi; Kowalski, Lukasz; Navarro, Sara; torres, josefina; Castañer Muñoz, Luis María (VDE Conference Publications, 2008)
      Conference report
      Restricted access - publisher's policy
      In this paper the most important constraints of the wind sensors for the Martian atmosphere are described, along with an overview of the past successful designs. Practically all the data available today about the Martian ...
    • Contribution to advanced hot wire wind sensing 

      Kowalski, Lukasz (Centre de Publicacions del Campus Nord SCCL (CPET), 2009)
      Conference lecture
      Open Access
    • Contribution to advanced hot wire wind sensing 

      Kowalski, Lukasz (Universitat Politècnica de Catalunya, 2016-01-22)
      Doctoral thesis
      Open Access
      The thermal anemometry is a method which allows to estimate wind magnitude be the mean of measuring heat transfer to the ambient in a forced convection process. For Earth's atmosphere condition, this method is typically ...
    • Exploring the performance of a miniature 3D wind sensor under extreme martian winds up to the dust devil scale 

      Domínguez Pumar, Manuel; Kowalski, Lukasz; Jiménez Serres, Vicente; Rodríguez Pérez, Ivette María; Soria Guerrero, Manel (2019)
      Conference report
      Open Access
      The objective of this paper is to explore the performance of a miniature 3D spherical wind sensor for Mars atmosphere, working under extreme wind speeds, up to the Dust Devil scale. The experimental campaign has been made ...
    • Fluid dynamics and heat transfer in the wake of a sphere 

      Rodríguez Pérez, Ivette María; Lehmkuhl, Oriol; Soria Guerrero, Manel; Gómez, Samuel; Domínguez Pumar, Manuel; Kowalski, Lukasz (2019-04)
      Article
      Open Access
      Direct numerical simulation and large-eddy simulation have been performed for a heated sphere at Reynolds numbers of $Re=1000$ and $Re=10^4$, respectively. The Prandtl number for both simulations has been $Pr=0.7$. ...
    • Heat flow dynamics in thermal systems described by diffusive representation 

      Domínguez Pumar, Manuel; Atienza García, María Teresa; Kowalski, Lukasz; Novio Vázquez, Santiago; Gorreta Mariné, Sergio; Jiménez Serres, Vicente; Silvestre Bergés, Santiago (Institute of Electrical and Electronics Engineers (IEEE), 2016-09-01)
      Article
      Open Access
      The objective of this paper is to analyze the dynamics of heat flow in thermal structures working under constant temperature operation. This analysis is made using the tools of sliding mode controllers. The theory is ...
    • Hypobaric chamber for wind sensor testing in Martian condictions 

      Kowalski, Lukasz; García Molina, Francisco Miguel (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
      Conference report
      Restricted access - publisher's policy
      In this paper we will describe the installation of a low pressure stainless steel horizontal chamber to be used in preliminary tests of a Mars atmosphere wind sensor. It includes custom made additional QF ports, electric ...
    • In situ size sorting in CVD synthesis of Si microspheres 

      Garin Escriva, Moises; Fenollosa Esteve, Roberto; Kowalski, Lukasz (Macmillan Publishers, 2016-12-08)
      Article
      Open Access
      Silicon microspheres produced in gas-phase by hot-wall CVD offer unique quality in terms of sphericity, surface smoothness, and size. However, the spheres produced are polydisperse in size, which typically range from 0.5¿µm ...
    • Low pressure spherical thermal anemometer for space missions 

      Kowalski, Lukasz; Jiménez Serres, Vicente; Domínguez Pumar, Manuel; Gorreta Mariné, Sergio; Silvestre Bergés, Santiago; Castañer Muñoz, Luis María (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      The novelty of this 2D thermal anemometer is the spherical compact and robust design with improved sensitivity in the range of 600-900Pa of carbon dioxide pressure and 0.25 to 10 m/s wind speed. The small size (11.2mm ...
    • Model identification of time-varying diffusive systems 

      Atienza García, María Teresa; Kowalski, Lukasz; Gorreta Mariné, Sergio; Pons Nin, Joan; Jiménez Serres, Vicente; Domínguez Pumar, Manuel (2018)
      Conference report
      Restricted access - publisher's policy
      This paper presents a characterization method based on diffusive representation for a class of linear or nonlinear time-varying diffusive systems. The system variation with time may come as a result of the own actuation ...
    • On the boundary layer development and heat transfer from a sphere at moderate Reynolds numbers 

      Rodríguez Pérez, Ivette María; Lehmkuhl, Oriol; Soria Guerrero, Manel; Gómez, Samuel; Domínguez Pumar, Manuel; Kowalski, Lukasz (2018)
      Conference report
      Restricted access - publisher's policy
      Direct and large-eddy numerical simulations have been performed for a heated sphere at Reynolds numbers 200, 300, 500, 750, 1000 and 104, in the context of the development of a spherical wind sensor for Mars atmosphere ...
    • On the effects of free-stream turbulence intensity in the fluid flow and heat transfer from a sphere at subcritical Reynolds numbers 

      Rodríguez Pérez, Ivette María; Lehmkuhl, Oriol; Soria Guerrero, Manel; Gomez, Samuel; Domínguez Pumar, Manuel; Kowalski, Lukasz (2018)
      Conference lecture
      Restricted access - publisher's policy
      In this work, the effect of the free-stream turbu-lence on the heat transfer and the near wake behind a sphere is studied at moderate Reynolds numbers of ¿¿ ¿ ¿¿¿¿ and ¿¿ ¿ ¿¿¿. Turbulence delays the sep-aration of the ...
    • Open loop testing for optimizing the closed loop operation of chemical systems 

      Domínguez Pumar, Manuel; Olm Miras, Josep Maria; Kowalski, Lukasz; Jiménez Serres, Vicente (Pergamon Press, 2020-04-06)
      Article
      Restricted access - publisher's policy
      One way to optimize the operation of chemical systems consists on using closed loop controls while the system is operated. This way, it is possible to optimize the operating point in the plant, process or chemical system ...
    • REMS: the environmental sensor suite for the Mars Science Laboratory rover 

      Gómez Elvira, J.; Armiens, C.; Castañer Muñoz, Luis María; Domínguez Pumar, Manuel; Genzer, M.; Gómez, Francisco; Haberle, Robert M.; Harris, Aiden M.; Jiménez Serres, Vicente; Kahanpää, H.; Kowalski, Lukasz; Lepinette, A.; Martín, Jacques Wesley; Martínez Frías, Jesús; McEwan, I.; Mora, L.; Moreno, Jose C.; Navarro, S.; De Pablo, M.A.; Peinado, V.; Peña, A.; Polkko, J.; Ramos, Miguel; Renno, Nilton O.; Ricart, Jordi; Richardson, M.; Rodríguez Manfredi, José Antonio; Romeral, Julio; Sebastián, Eduardo M.; Serrano, Jaime; De La Torre Juárez, Manuel; Torres, Jose Antonio; Torrero, F.; Urquí, R.; Vázquez, L.; Velasco, T.; Verdasca, J.; Zorzano, M.P.; Martín Torres, Javier (2012-09)
      Article
      Restricted access - publisher's policy
      The Rover Environmental Monitoring Station (REMS) will investigate environ- mental factors directly tied to current habitability at the Martian surface during the Mars Sci- ence Laboratory (MSL) mission. Three major ...
    • Self-calibrating closed-loop circuit for configurable constant voltage thermal anemometers 

      Gorreta Mariné, Sergio; Barajas Ojeda, Enrique; Kowalski, Lukasz; Atienza García, María Teresa; Domínguez Pumar, Manuel; Jiménez Serres, Vicente (Institution of Electrical Engineers, 2015-09-17)
      Article
      Open Access
      A new circuit is described which applies a configurable voltage across an RTD while the current flowing through it is measured with a current mirror. The circuit also allows working with voltages above the IC supply voltage ...
    • Sliding mode analysis applied to improve the dynamical response of a spherical 3D wind sensor for Mars atmosphere 

      Atienza García, María Teresa; Kowalski, Lukasz; Gorreta Mariné, Sergio; Jiménez Serres, Vicente; Castañer Muñoz, Luis María; Domínguez Pumar, Manuel (2017-11-01)
      Article
      Open Access
      The objective of this paper is to show how the structure of a thermal wind anemometer can be tuned to ensure a fast response when the sensor works in closed loop configuration (constant temperature operation). If the thermal ...
    • Smart control of chemical gas sensors for the reduction of their time response 

      Domínguez Pumar, Manuel; Kowalski, Lukasz; Calavia, Raul; Llobet, E. (2016-06-28)
      Article
      Open Access
      The objective of this paper is to show the first results obtained with a gas sensor made of Au-functionalized WO3 nanoneedles working under a closed-loop control designed to reduce its time response. The average temperature ...