Reports de recerca
http://hdl.handle.net/2117/5559
2024-03-29T06:51:41ZDiseño de un circuito de control
http://hdl.handle.net/2117/367961
Diseño de un circuito de control
López Lapeña, Oscar
2022-06-02T10:08:42ZLópez Lapeña, OscarPiecewise linearization of quadratic transfer characteristics
http://hdl.handle.net/2117/367540
Piecewise linearization of quadratic transfer characteristics
Pallàs-Areny, Ramon
Piecewise linearization replaces a nonlinear transfer characteristic curve by a string of linear
segments that connect several calibration points of the curve. This technique can be implemented by
low-power digital processors but no design rules are available to determine how many segments are
required for a given approximation between the actual curve and the polygonal line that replaces it. This
paper provides the design equations to decide the number and span of the segments needed to linearize
quadratic transfer characteristics such as those of the LM19 and the Pt100 (t > 0 °C) temperature
sensors. The method can be applied to higher-order polynomial transfer characteristics such as
thermocouples albeit non-uniform segmentation is not systematic in these cases. Using the proposed
approach, the Pt100 can be approximated by seven segments between 0 °C and 850 °C and three
segments between -200 °C and 0 °C, with a maximal deviation below 20 % of the uncertainty limit for
class B sensors in both cases. Better approximations are feasible provided truncation effects are
considered.
UPC-ISIG-2.EN
2022-05-19T16:05:25ZPallàs-Areny, RamonPiecewise linearization replaces a nonlinear transfer characteristic curve by a string of linear
segments that connect several calibration points of the curve. This technique can be implemented by
low-power digital processors but no design rules are available to determine how many segments are
required for a given approximation between the actual curve and the polygonal line that replaces it. This
paper provides the design equations to decide the number and span of the segments needed to linearize
quadratic transfer characteristics such as those of the LM19 and the Pt100 (t > 0 °C) temperature
sensors. The method can be applied to higher-order polynomial transfer characteristics such as
thermocouples albeit non-uniform segmentation is not systematic in these cases. Using the proposed
approach, the Pt100 can be approximated by seven segments between 0 °C and 850 °C and three
segments between -200 °C and 0 °C, with a maximal deviation below 20 % of the uncertainty limit for
class B sensors in both cases. Better approximations are feasible provided truncation effects are
considered.Basic design of the signal chain in sensor-based measurement systems
http://hdl.handle.net/2117/366745
Basic design of the signal chain in sensor-based measurement systems
Pallàs-Areny, Ramon; Casas Piedrafita, Óscar
Sensor signals do not suit direct electronic communication and need further
processing before being digitized. Therefore, the requirements of the digitizer add to those
needed to fulfill the basic specifications for the measurement system, namely measurement
range, resolution and accuracy, and general constraints such as power consumption and cost.
This tutorial describes how to use the quotient between the measurement range and the
resolution, termed dynamic range, as a guiding parameter to find out the signal processing
functions required in the signal chain, and determines the basic parameters of each function
for low-frequency signals.
2022-05-03T15:41:40ZPallàs-Areny, RamonCasas Piedrafita, ÓscarSensor signals do not suit direct electronic communication and need further
processing before being digitized. Therefore, the requirements of the digitizer add to those
needed to fulfill the basic specifications for the measurement system, namely measurement
range, resolution and accuracy, and general constraints such as power consumption and cost.
This tutorial describes how to use the quotient between the measurement range and the
resolution, termed dynamic range, as a guiding parameter to find out the signal processing
functions required in the signal chain, and determines the basic parameters of each function
for low-frequency signals.Method and apparatus for obtaining cardiovascular information by measuring between two extremities
http://hdl.handle.net/2117/127553
Method and apparatus for obtaining cardiovascular information by measuring between two extremities
Pallàs-Areny, Ramon; Casanella Alonso, Ramón; Gómez Clapers, Joan
In this patent of invention there are described a method and an apparatus for obtaining information on the cardiovascular system beat by beat and continuously which are based exclusively on measurements between two limbs and effected with a pair of distal electrodes on each limb. The measurement is made by causing an alternating current to flow between one electrode of each limb and measuring the potential difference between the other two electrodes, one also on each limb. This potential difference has a low frequency component which is the electrocardiogram (or ECG) and another component having the frequency of the injected alternating current and from which the so-called impedance plethysmogram (IPG) is extracted. The cardiovascular information will be determined by measuring the time interval between any predefined characteristic element of the ECG and one of the IPG.
European Patent Application
2019-01-24T14:40:23ZPallàs-Areny, RamonCasanella Alonso, RamónGómez Clapers, JoanIn this patent of invention there are described a method and an apparatus for obtaining information on the cardiovascular system beat by beat and continuously which are based exclusively on measurements between two limbs and effected with a pair of distal electrodes on each limb. The measurement is made by causing an alternating current to flow between one electrode of each limb and measuring the potential difference between the other two electrodes, one also on each limb. This potential difference has a low frequency component which is the electrocardiogram (or ECG) and another component having the frequency of the injected alternating current and from which the so-called impedance plethysmogram (IPG) is extracted. The cardiovascular information will be determined by measuring the time interval between any predefined characteristic element of the ECG and one of the IPG.Technical specifications and system architecture of a compact weather station for rice blast field study
http://hdl.handle.net/2117/87038
Technical specifications and system architecture of a compact weather station for rice blast field study
Pallàs-Areny, Ramon; Casas Piedrafita, Óscar; López Lapeña, Oscar; Hornero Ocaña, Gemma; Serrano Finetti, Roberto Ernesto; Quílez Figuerola, Marcos; Polo Cantero, José; Cuadras Tomàs, Àngel; PEREIRAS, Jaime; PUIGDOLLERS, Pau
This report describes the work carried out as part of an EC-funded project called RICE-GUARD, which is developing a novel rice blast prediction tool based on an in-field wireless sensor network. Existing systems for forecasting rice blast have been developed from meteorological data obtained from existing weather stations often placed far from rice fields or from stations which sensors are above the canopy and which relation with actual meteorological conditions that can result in leaf wetness are uncertain. RICE-GUARD aims at measuring meteorological parameters in and above the canopy in real time thus overcoming that problem.
Informe de projecte de recerca
2016-05-13T09:40:59ZPallàs-Areny, RamonCasas Piedrafita, ÓscarLópez Lapeña, OscarHornero Ocaña, GemmaSerrano Finetti, Roberto ErnestoQuílez Figuerola, MarcosPolo Cantero, JoséCuadras Tomàs, ÀngelPEREIRAS, JaimePUIGDOLLERS, PauThis report describes the work carried out as part of an EC-funded project called RICE-GUARD, which is developing a novel rice blast prediction tool based on an in-field wireless sensor network. Existing systems for forecasting rice blast have been developed from meteorological data obtained from existing weather stations often placed far from rice fields or from stations which sensors are above the canopy and which relation with actual meteorological conditions that can result in leaf wetness are uncertain. RICE-GUARD aims at measuring meteorological parameters in and above the canopy in real time thus overcoming that problem.Report on RICE-GUARD Market Requirements and Preliminary System Specifications
http://hdl.handle.net/2117/28465
Report on RICE-GUARD Market Requirements and Preliminary System Specifications
KATSANTONIS, Dimitris; DRAMALIS, Christos; Pallàs-Areny, Ramon; Casas Piedrafita, Óscar; López Lapeña, Oscar; PUIGDOLLERS, Pau; PEREIRAS, Jaime
This report outlines the work carried out as part of the EC-funded project called RICE-GUARD. The project concerns the development of a novel in-field system which is going to be capable of continuously monitoring weather data and predicting rice blast disease. A bottom-up approach was mobilised by consulting with farmers associations and carrying out research to obtain a clear understanding of the technological needs and specifications of European rice growers. These consultations serve to understand and detail the current needs and limitations of rice growers in the monitoring and controlling of the most important disease of rice. In addition, they will guide future research and development work to be in line with the markets demands for monitoring rice blast during the different growth stages.
Informe de projecte de recerca
2015-06-30T09:25:46ZKATSANTONIS, DimitrisDRAMALIS, ChristosPallàs-Areny, RamonCasas Piedrafita, ÓscarLópez Lapeña, OscarPUIGDOLLERS, PauPEREIRAS, JaimeThis report outlines the work carried out as part of the EC-funded project called RICE-GUARD. The project concerns the development of a novel in-field system which is going to be capable of continuously monitoring weather data and predicting rice blast disease. A bottom-up approach was mobilised by consulting with farmers associations and carrying out research to obtain a clear understanding of the technological needs and specifications of European rice growers. These consultations serve to understand and detail the current needs and limitations of rice growers in the monitoring and controlling of the most important disease of rice. In addition, they will guide future research and development work to be in line with the markets demands for monitoring rice blast during the different growth stages.D6.1 Report on Results on Parallel Testing
http://hdl.handle.net/2117/18995
D6.1 Report on Results on Parallel Testing
Casas Piedrafita, Óscar; Quílez Figuerola, Marcos; López Martínez, Margarita; Martínez Farré, Francesc Xavier
Delivarable entregat a la Unió Europea dins del projecte CompoBall. Novel on line composting monitoring system.
Grant Agreement No: 243625
2013-04-26T07:01:28ZCasas Piedrafita, ÓscarQuílez Figuerola, MarcosLópez Martínez, MargaritaMartínez Farré, Francesc XavierDelivarable entregat a la Unió Europea dins del projecte CompoBall. Novel on line composting monitoring system.
Grant Agreement No: 243625Plan de pruebas funcionales y de satisfacción
http://hdl.handle.net/2117/15423
Plan de pruebas funcionales y de satisfacción
Casas Piedrafita, Óscar; Hornero Ocaña, Gemma
Informe projecte amb B&J Adaptaciones
2012-02-29T16:47:34ZCasas Piedrafita, ÓscarHornero Ocaña, GemmaInforme projecte amb B&J Adaptaciones