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In this paper is presented the procedure to wind speed measurement based on ultrasonic sensors. For this purpose the ultrasonic Time-of-Flight (ToF) was estimated using the DFT (Discrete Fourier Transform) technique. The analysis of the influence of multiplicative and additive noise of the medium into the DFT is carried out. Then, the uncertainties propagation for ToF and wind speed measurements is...
Partial discharge measurement has long been used to evaluate insulation system design and as a quality assurance test for High Voltage (HV) apparatus prior to installation. PD is characterized by high frequency current pulses originating in gas ionization processes when damaged insulation is submitted to high values of electric field. PD process modeling allows a better understanding of the phenomena...
This paper presents the procedures for the wind speed measurement using ultrasonic transducers. The wind speed measurement is based on the time-of-flight (ToF) ultrasonic estimation that has been estimated using the Extended Kalman Filter (EKF) algorithm. For this purpose it was developed the dynamic system model in state space and was analyzed the convergence of the EKF algorithm. Simulation results...
A method for measuring speed wind, based on echo detection using ultrasonic transducers with stationary wavelet transform is presented. The stationary wavelet transform (SWT) can be obtained by modifying the basic scheme of discrete wavelet transform (DWT). Two filters are applied to produce the output two sequences at each level. Since decimation is not obtained at the exit of each level, sequences...
Hydrogen concentration measurement with low uncertainty is of great importance in industrial, scientific and commercial applications, which is directly related to the performance of the acquisition system and signal processing. For this purpose, in this paper, it is presented a procedure for the hydrogen concentration in air estimation, using ultrasonic transducers. The time of flight measurement...
The estimation and monitoring of partial discharge (PD) in high voltage electrical systems (HV) allow the identification and forecast problems associated with transformers and insulators. For this purpose, this paper presents an estimation procedure of partial discharges using data fusion techniques based on fuzzy OWA operators (Ordered Weighted Average) and its uncertainties. It is presented some...
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...
Due to the evolution of electronics and measurement processes, today there are many systems and methods that can be used for measuring airflow, such as the method of differential pressure across of a pneumotachograph or measurements using various anemometers. This research proposes the design and development of a system for measuring respiratory flow using data fusion of information from the Transit...
A method for measuring multi-level fluid, based on ultrasonic echo detection by means of the wavelet transform (WT), is presented. The Wavelet Transform provides a tool for analyzing the time frequency evolution of transient signals. This highlights the excellent performance shown by the WT as a powerful tool for the analysis of echoes in a noisy environment. A mother wavelet is utilized to obtain...
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