Sebastian Yuri Cavalcanti Catunda
Federal University of Rio Grande do Norte
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IEEE Transactions on Instrumentation and Measurement | 1999
Sebastian Yuri Cavalcanti Catunda; G.S. Deep; A.C. van Haandel; Raimundo C. S. Freire
The measurement and utilization of the respiration rate or oxygen uptake rate (OUR) is very important in activated sludge system control. It provides information about the quality of the influent, activated sludge quality and can indicate the presence of toxic elements that can poison the system. The existing methods for continuously measuring and estimating the OUR have, generally, a long sampling interval of a few minutes. An alternative respiration rate meter with much shorter response time is proposed. The results of simulation studies, as well as experimental results of a microcontroller based data acquisition system connected to a PC, around a laboratory scale biological reactor are presented.
instrumentation and measurement technology conference | 2005
Sebastian Yuri Cavalcanti Catunda; Jean-François Naviner; R.C.S. Freire; G.A.L. Pinheiro
Programmable analog conditioning circuits are very important for instrumentation systems since the same circuit can be used for different type of sensors. The main functions that must be provided for the analog conditioning circuit are gain and dc level shift. The conditioning circuit must be optimized, especially for systems on chip, in order to use reduced number of components, area and costs. In this work, we propose an architecture for a programmable gain and dc level shift circuit based on a procedure that yields the smallest set of passive components while guaranteeing the design specified performance in terms of maximum loss of resolution and no measurement range loss
instrumentation and measurement technology conference | 2014
L. V. Araujo; Sebastian Yuri Cavalcanti Catunda; Carlos Eduardo Trabuco Dórea; Raimundo C. S. Freire
This paper proposes a new architecture of a controlled-temperature hot-wire anemometer using voltage feedback linearization. The voltage feedback linearizes the sensor input-output relationship and the controller is designed to achieve null steady-state error and reduce the system response time. Analysis of the behavior of the architecture modeled using Simulink is presented for a NTC sensor. Simulation results are presented and discussed, and the architecture is compared with the classical constant-temperature anemometer (CTA) one.
instrumentation and measurement technology conference | 2012
Juan M. Mauricio Villanueva; Sebastian Yuri Cavalcanti Catunda; Ricardo Tanscheit; Raimundo C. S. Freire
In this work, a wind speed measurement model based on Evidence Theory and Data Fusion of the time-of-flight (ToF) information is presented. The fusion is obtained through threshold detection (TH) and phase difference (PD) techniques For this purpose, the evidence theory using fuzzy set theory and interval analysis has been successfully used to represent (from random-fuzzy variables - RFV) and assessment the uncertainty ToF measurement. A data fusion method is presented based on the concept of relations of compatibility and OWA operators with partial aggregation to the variables being fused. Simulation results are presented to several measured values using the TH and PD techniques.
instrumentation and measurement technology conference | 2017
Veronica Maria Lima Silva; Antonio Augusto Lisboa de Souza; Sebastian Yuri Cavalcanti Catunda; Raimundo C. S. Freire
This paper presents a non-uniform sampling analog-to-digital converter (ADC) architecture using an adaptive level-crossing technique. The architecture can be dynamically configured through three parameters that allow the user to match the ADC to the signal to be acquired or to application constraints. When applied to sparse signals, this architecture outperforms uniform sampling architectures. In the case of an Electrocardiogram (ECG) signal, our architecture showed gains of up to 10 dB of signal to noise ratio (SNR) when considering the same number of samples of uniform sampling. When the same SNR is considered, our architecture allows reductions in excess of 50%. The architecture was implemented with FPGA and general purpose components, and showed a response time of about 200 μs, which could be further reduced in an integrated implementation.
instrumentation and measurement technology conference | 2017
Rafael M. S. Santos; Caio L. G. de S. Alves; Euler C. T. Macedo; Juan M. Mauricio Villanueva; Lucas V. Hartmann; Sebastian Yuri Cavalcanti Catunda
State of Charge (SoC) is the most important parameter to be estimated on a Battery Management System (BMS). Improper SoC management can cause faster battery degradation, reduce its operational lifetime and, on extreme cases of overcharge, it may lead to an explosion. In addition, batteries are complex electrochemical systems, and both the electrical components and chemical reactions vary significantly with changes in temperature. In this paper, it is presented the effect of the temperature on the Lead Acid battery SoC estimation. The data collection was performed varying the battery temperature, under a range of 10oC to 70oC. To determine the model parameters from the used battery, several data acquisition was performed. To obtain the SoC estimation it was implemented the Extended Kalman Filter that provide satisfactory results. The simulated results were obtained using the MATLAB environment. To verify the effectiveness and the performance of the implemented Kalman Filter it was applied the EKF for estimate the SoC of a Lead Acid battery described in the Introduction Section. It is important to realize that is a comparative study and the only evaluation comparison with the SoC estimation that we can do uses the Open Circuit Voltage (OCV).
instrumentation and measurement technology conference | 2015
L. V. Araujo; Sebastian Yuri Cavalcanti Catunda; D. R. Belfort; M. Denoual; Raimundo C. S. Freire
In this paper a new analog behavioral model of a negative temperature coefficient thermoresistive sensor developed using SPICE for a hot-wire Wheatstone-Bridge Constant Temperature Anemometer is proposed. The analog model was developed using a capacitor and voltage and current dependent sources. This model is suitable for transient and steady-state time domain analysis. Sensors behavior is detailed and an example of employment in a Wheatstone-Bridge Constant Temperature Anemometer architecture is presented. The validation is made through simulation, results of which are presented and discussed.
instrumentation and measurement technology conference | 2017
Renato Franklin Rangel; Cícero da Rocha Souto; Maxsuel Ferreira Cunha; Alan Goncalves Paulo e Silva; Ana Maria Marques de Lima; Sebastian Yuri Cavalcanti Catunda
This paper presents the development and characterization of an electric power generator device using a piezoelectric material made of Lead Zirconate Titanate (PZT). The device was built like a mechanical structure in which were coupled eight piezoelectric cells subjected to cyclical loads of traction and compression, which work as electricity generator. For the experimental characterization, a system was mounted and instrumented to measure the acceleration and generated voltages. Initially numerical simulations were developed to guide the set of experimental actions. The simulated and experimental results obtained of the dynamics of the generator and the electric voltages generated are presented. The maximum power developed by the generator was 9.760 mW submitted to a base acceleration of 18.3 m/s² at a frequency of 60 Hz.
instrumentation and measurement technology conference | 2017
José Marques Basílio Sobrinho; Maxsuel Ferreira Cunha; Cícero da Rocha Souto; Simplício Arnaud da Silva; Alexsandro José Virgínio dos Santos; Sebastian Yuri Cavalcanti Catunda
The possibility of using Shape Memory Alloys (SMA) has been currently studied in development of actuators and thermoelectric motors. Generally, these devices use the SMA characteristics of high strain or force capability to produce the displacement and, in this case, the displacement is produced by supplying heat to the actuator element. Their applications are still limited to low speed, but, with the possibility of high torques. When they are used as a thermoelectric motor, the development of a suitable instrumentation becomes indispensable to drive and measure the electrical parameters and the motor motion. Based on that need, this paper presents the electronic instrumentation to characterize a thermoelectric motor grounded on shape changes in shape memory alloys. The prototype of the motor has been built using mini SMA springs as active elements. The geometry of the motor and the spring support base have been developed in ABS (Acrylonitrile Butadiene Styrene) polymer. A current amplifier circuit was designed to generate heat and, consequently, produce the motor displacement. The circuit was switched for pulse width modulation (PWM), which has produced the heating by Joule effect. The image technique has been used with a camera placed on the rotor shaft and the SMA actuator, for the strain and displacement measurement. A load cell has been used for the force measurement and a thermocouple for the temperature measurement, both properly conditioned. The electrical current and the potential difference have been measured on it, and so, the electrical resistance variation of the actuator was obtained. Thus, in order to consolidate the thermoelectric motor characterization, results of electrical resistance, force and displacement are presented as a function of heating temperature on the actuators. Furthermore, results of force related to strain and the motor shaft rotation in the time domain are also shown.
instrumentation and measurement technology conference | 2017
Walber Medeiros Lima; Carlos José de Araújo; Rodinei Medeiros Gomes; Cícero da Rocha Souto; Ana Maria Marques de Lima; Sebastian Yuri Cavalcanti Catunda
Shape memory alloys (SMA) have been the subject of several studies due to their excellent physical and mechanical properties. For this reason, a wire SMA is used in various applications as thermomechanical actuators that are subject to repeated thermal cycling in a range of temperatures and variable loads. The mechanical stability is a fundamental behavior that need to be understood to project well accurate actuators. Thus, the total recoverable strain must be constant under certain external conditions. In this research, an apparatus was built to monitor the recoverable strain in Ni-Ti SMA wire with differentiated thermomechanical training during prolonged thermal cycles under constant loads. Experimental results have shown that the recoverable strain decreases with cycling. In addition, an acceptable stabilization can be found for a specific condition of thermomechanical training and constant load.