77ris paper describes a data acqui.\'ition .\'olution using a single chip risc type microcontroll... more 77ris paper describes a data acqui.\'ition .\'olution using a single chip risc type microcontroller with ver)' Jew other active and passive component.\' Howevcr this solution although greatly reducing tile around. 77re need Jor thermallY stable circuits and commissioning time of wcighbridge. type equiprncnt components is minimized through lhe use oJ lhe some needs a cost effectivc solution for the load cclls data amplification chain Jor both lhe ...ignal and reJerence. proccssing so that is not uneconornical to use one per together with soflware calibration. The analog to transduccr. digital conversion is done u...ing lhe single ramp approach controlled by lhe microcontroller which Having in rnind industrial wcighing applications doe... ali lhe digital proce ing required as well a.. whcre (,()()() divisions are nccded for the equiprnent lhe serial communication with lhe external world. (external divisions) a conversion resolution of at least 77re paper also describes an example oJ soflware 60000 divisions (10 infernal divisions for cach calibration oJ a multi-loadcell weighhridge using cxternal) with 20 or more rcadings per second. ai one single processing module per sensor. lcast for static weighing applications. For dynarnic weighing a fastcr reading cate is required but with Kevwords: Data Acquisition. lntelligent Transducers. lowcr rcsolution
A silicon soil moisture sensor, based in the dual-probe heat-pulse (DPHP) method, was modeled and... more A silicon soil moisture sensor, based in the dual-probe heat-pulse (DPHP) method, was modeled and simulated for achieving, with low cost, accurate and reliable measurements. This method is based on the application of a heat pulse during a fixed interval of time. The maximum rise in temperature (T m) is monitored by the measurement probe, placed at a certain distance of the heater source. A lowcost high-performance and small temperature sensor (a dynamic V P T AT generator) is required to be placed into the probe which have 0.912 mm in diameter and 20 mm long. If one considers the range of water contents, ratio of water mass to dry soil mass, in a typical agricultural soil (0.05 to 0.35 m 3 m −3), the average sensitivity of the dual probe is about 1.95 • C per unit change (m 3 m −3
This paper describes a radio frequency transceiver designed in UMC RF 0.18 μm CMOS process. This ... more This paper describes a radio frequency transceiver designed in UMC RF 0.18 μm CMOS process. This process has a poly and six metal layers, allowing the use of integrated spiral inductors (with a reasonable quality factor), high resistor value (a special layer is available) and a ...
Summary: This paper describes the design, modeling and optimization of a miniaturized self-calibr... more Summary: This paper describes the design, modeling and optimization of a miniaturized self-calibrated pyrometer to detect infrared radiation (in 5-20 µm range of wavelengths) in order to measure the real temperature of objects without contact. The microsystem consists of a ...
This paper describes a fuzzy logic based slip controller for an induction motor, with efficiency ... more This paper describes a fuzzy logic based slip controller for an induction motor, with efficiency optimization for steady state operation. The speed control is accomplished through a Mandani type fuzzy controller, with 11 rules, taking speed error (built with 5 Membership Functions ...
CMOS technology has reached its maturity. Therefore, design engineers used it for developing RF c... more CMOS technology has reached its maturity. Therefore, design engineers used it for developing RF circuits. The advantages of CMOS technology are the higher integration, low-power consumption, low-voltage supply and low-cost compared with Bipolar technology. The ...
This work presents a Multi-Chip-Module (MCM) based microsystem for irrigation control in agricult... more This work presents a Multi-Chip-Module (MCM) based microsystem for irrigation control in agriculture. The proposed microsystem includes a soil moisture microsensor, an analog-to-digital converter, signal processing circuits (digital filtering and sensor interface) and a RF ...
Actuation, monitoring, and control of fabrics feeding during high-speed sewing LF SILVA, M LIMA, ... more Actuation, monitoring, and control of fabrics feeding during high-speed sewing LF SILVA, M LIMA, H CARVALHO, AM ROCHA, FN FERREIRA, JL MONTEIRO, and C COUTO School of Engineering, University of Mmho Guimaraes, Portugal SYNOPSIS For some years now ...
Due the intensive use of power converters and other non-linear loads in industry and by consumers... more Due the intensive use of power converters and other non-linear loads in industry and by consumers in general, it can be observed an increasing deterioration of the power systems voltage and current waveforms. The presence of harmonics in the power lines results in greater power losses ...
77ris paper describes a data acqui.\'ition .\'olution using a single chip risc type microcontroll... more 77ris paper describes a data acqui.\'ition .\'olution using a single chip risc type microcontroller with ver)' Jew other active and passive component.\' Howevcr this solution although greatly reducing tile around. 77re need Jor thermallY stable circuits and commissioning time of wcighbridge. type equiprncnt components is minimized through lhe use oJ lhe some needs a cost effectivc solution for the load cclls data amplification chain Jor both lhe ...ignal and reJerence. proccssing so that is not uneconornical to use one per together with soflware calibration. The analog to transduccr. digital conversion is done u...ing lhe single ramp approach controlled by lhe microcontroller which Having in rnind industrial wcighing applications doe... ali lhe digital proce ing required as well a.. whcre (,()()() divisions are nccded for the equiprnent lhe serial communication with lhe external world. (external divisions) a conversion resolution of at least 77re paper also describes an example oJ soflware 60000 divisions (10 infernal divisions for cach calibration oJ a multi-loadcell weighhridge using cxternal) with 20 or more rcadings per second. ai one single processing module per sensor. lcast for static weighing applications. For dynarnic weighing a fastcr reading cate is required but with Kevwords: Data Acquisition. lntelligent Transducers. lowcr rcsolution
A silicon soil moisture sensor, based in the dual-probe heat-pulse (DPHP) method, was modeled and... more A silicon soil moisture sensor, based in the dual-probe heat-pulse (DPHP) method, was modeled and simulated for achieving, with low cost, accurate and reliable measurements. This method is based on the application of a heat pulse during a fixed interval of time. The maximum rise in temperature (T m) is monitored by the measurement probe, placed at a certain distance of the heater source. A lowcost high-performance and small temperature sensor (a dynamic V P T AT generator) is required to be placed into the probe which have 0.912 mm in diameter and 20 mm long. If one considers the range of water contents, ratio of water mass to dry soil mass, in a typical agricultural soil (0.05 to 0.35 m 3 m −3), the average sensitivity of the dual probe is about 1.95 • C per unit change (m 3 m −3
This paper describes a radio frequency transceiver designed in UMC RF 0.18 μm CMOS process. This ... more This paper describes a radio frequency transceiver designed in UMC RF 0.18 μm CMOS process. This process has a poly and six metal layers, allowing the use of integrated spiral inductors (with a reasonable quality factor), high resistor value (a special layer is available) and a ...
Summary: This paper describes the design, modeling and optimization of a miniaturized self-calibr... more Summary: This paper describes the design, modeling and optimization of a miniaturized self-calibrated pyrometer to detect infrared radiation (in 5-20 µm range of wavelengths) in order to measure the real temperature of objects without contact. The microsystem consists of a ...
This paper describes a fuzzy logic based slip controller for an induction motor, with efficiency ... more This paper describes a fuzzy logic based slip controller for an induction motor, with efficiency optimization for steady state operation. The speed control is accomplished through a Mandani type fuzzy controller, with 11 rules, taking speed error (built with 5 Membership Functions ...
CMOS technology has reached its maturity. Therefore, design engineers used it for developing RF c... more CMOS technology has reached its maturity. Therefore, design engineers used it for developing RF circuits. The advantages of CMOS technology are the higher integration, low-power consumption, low-voltage supply and low-cost compared with Bipolar technology. The ...
This work presents a Multi-Chip-Module (MCM) based microsystem for irrigation control in agricult... more This work presents a Multi-Chip-Module (MCM) based microsystem for irrigation control in agriculture. The proposed microsystem includes a soil moisture microsensor, an analog-to-digital converter, signal processing circuits (digital filtering and sensor interface) and a RF ...
Actuation, monitoring, and control of fabrics feeding during high-speed sewing LF SILVA, M LIMA, ... more Actuation, monitoring, and control of fabrics feeding during high-speed sewing LF SILVA, M LIMA, H CARVALHO, AM ROCHA, FN FERREIRA, JL MONTEIRO, and C COUTO School of Engineering, University of Mmho Guimaraes, Portugal SYNOPSIS For some years now ...
Due the intensive use of power converters and other non-linear loads in industry and by consumers... more Due the intensive use of power converters and other non-linear loads in industry and by consumers in general, it can be observed an increasing deterioration of the power systems voltage and current waveforms. The presence of harmonics in the power lines results in greater power losses ...
Uploads
Papers by Carlos Couto