Filip Vaverka - Academia.edu (original) (raw)
Papers by Filip Vaverka
Application of Sweep Frequency Eddy Current Testing to Material Defect Evaluation
2022 ELEKTRO (ELEKTRO)
Applied Sciences
An investigation of artificial flaws in electromagnetic non-destructive evaluation using eddy-cur... more An investigation of artificial flaws in electromagnetic non-destructive evaluation using eddy-current frequency-response analysis is carried out in this study. A new approach incorporating innovative solution is proposed. The goal was to increase the resolution of gained signals in contrast to the conventional sweep-frequency method. The proposed procedure was tested on real material specimens where differential responses were gained from artificial electro-discharge machined flaws. Two plate specimens having EDM flaws of various dimensions were inspected. Eddy-current responses due to the material flaws were sensed and compared to a dataset that was obtained by numerical modelling. The presented unique results clearly show that the resolution of a fixed probe driven with sweep-frequency excitation signal can be increased when the appropriate probe instrumentation is used and the characteristics are further mathematically processed.
Nondestructive Evaluation of Conductive Biomaterials Using SFECT Method
2021 13th International Conference on Measurement, 2021
The aim of this work is to perform the electromagnetic nondestructive evaluation on conductive ma... more The aim of this work is to perform the electromagnetic nondestructive evaluation on conductive material using sweep frequency eddy current testing. The potential for this technique to be used for more complex defect detection is being investigated. Three types of eddy current probes are used to examine the three specimens with the presence of artificial notches. Gained signals are processed and discussed.
Apparatus for testing the basic parameters of pacemaker
2020 ELEKTRO, 2020
This paper describes a system design for testing implantable devices, namely pacemakers, that mea... more This paper describes a system design for testing implantable devices, namely pacemakers, that measures selected pacemaker parameters to indicate their proper functionality or potential malfunction. The resulting signals are interpreted and plotted using the programming interface of MATLAB. The efficiency of the resulting wiring is tested on real pacemakers and compared to the values of commercial programmers. The system is designed for easy and universal measurement of pacemaker parameters for learning purposes in the teaching process.
Electromagnetic Field in Vicinity of Electronic Baby Monitor
2020 ELEKTRO, 2020
Usage of devices emitting electromagnetic (EM) radiation on everyday basis leads to almost ubiqui... more Usage of devices emitting electromagnetic (EM) radiation on everyday basis leads to almost ubiquitous exposition to the EM field for everyone. The knowledge of the values of surrounding EM field may help to estimate the exposure and bring the better understanding of the effects. Main topic of presented paper deals with measurement and simulation of the electric field near the electronic baby monitor under standard condition. Chosen electronic monitor works at a frequency of 1900 MHz. Obtained values do not exceed the limits set by the regulation. However, some caution should be exercised when using such devices, in particular regarding keeping a safe distance from the little children.
Ultrasound based distance measurement and assessment of obstacles in the area – a concept for educational purposes
2020 ELEKTRO, 2020
This paper describes a distance measurement process, tracking the environment, and determining th... more This paper describes a distance measurement process, tracking the environment, and determining the presence of space obstacles. The ultrasonic module HC-SR04 is used to measure the distance. This module is complemented by a servo motor, which allows gradual monitoring of the surroundings. The way of signaling obstacles in the space is realized via the vibrating motor. All information about the measured distance is then transmitted to the computer via the Bluetooth module, where is created graphical user interface in the MATLAB program. The system is designed to enable orientation in space for people with visual impairments.
Experimental Identification of 316L Stainless Steel’s Artificial Fatigue Cracks by Eddy Current Method
2020 ELEKTRO, 2020
The paper deals with the issue of electromagnetic non-destructive investigation of real fatigue d... more The paper deals with the issue of electromagnetic non-destructive investigation of real fatigue defects of conductive materials. Austenitic stainless steel of grade AISI 316L is investigated by the eddy current method. Harmonic excitation is used for driving of the exciting coils. Presented fatigue cracks are induced by the three-point bending of the plates on the cycling machine with predefined loading process parameters. The gained response signals of the investigated regions of interest are graphically presented and discussed in the article.
A piezoelectric Foil Sensor used for Arterial Pulse Measurement
The article deals with principle of the heart activity measurement using a piezoelectric sensor. ... more The article deals with principle of the heart activity measurement using a piezoelectric sensor. There is an information about design of the device serving for arterial pulse wave measurement. The device allows conversion of an electrical charge from the piezoelectric sensor and offers analog signal preprocessing. The signal is later digital processed to achieve a heart rate of the measured subject.
Investigation of Artificial Cracks by Sweep Frequency Eddy Current Testing
The article deals with the utilization of the sweep frequency eddy current technique as an altern... more The article deals with the utilization of the sweep frequency eddy current technique as an alternative method for material crack evaluation. The new eddy current probe is designed and presented. Experimental measurements are carried out to evaluate resolution of the probe while the harmonic signal is used for the excitation. The gained results are presented and discussed in the paper.
Sweep frequency eddy current testing: numerical simulation of various probe types
2021 22nd International Conference on Computational Problems of Electrical Engineering (CPEE)
Application of Sweep Frequency Eddy Current Testing to Material Defect Evaluation
2022 ELEKTRO (ELEKTRO)
Applied Sciences
An investigation of artificial flaws in electromagnetic non-destructive evaluation using eddy-cur... more An investigation of artificial flaws in electromagnetic non-destructive evaluation using eddy-current frequency-response analysis is carried out in this study. A new approach incorporating innovative solution is proposed. The goal was to increase the resolution of gained signals in contrast to the conventional sweep-frequency method. The proposed procedure was tested on real material specimens where differential responses were gained from artificial electro-discharge machined flaws. Two plate specimens having EDM flaws of various dimensions were inspected. Eddy-current responses due to the material flaws were sensed and compared to a dataset that was obtained by numerical modelling. The presented unique results clearly show that the resolution of a fixed probe driven with sweep-frequency excitation signal can be increased when the appropriate probe instrumentation is used and the characteristics are further mathematically processed.
Nondestructive Evaluation of Conductive Biomaterials Using SFECT Method
2021 13th International Conference on Measurement, 2021
The aim of this work is to perform the electromagnetic nondestructive evaluation on conductive ma... more The aim of this work is to perform the electromagnetic nondestructive evaluation on conductive material using sweep frequency eddy current testing. The potential for this technique to be used for more complex defect detection is being investigated. Three types of eddy current probes are used to examine the three specimens with the presence of artificial notches. Gained signals are processed and discussed.
Apparatus for testing the basic parameters of pacemaker
2020 ELEKTRO, 2020
This paper describes a system design for testing implantable devices, namely pacemakers, that mea... more This paper describes a system design for testing implantable devices, namely pacemakers, that measures selected pacemaker parameters to indicate their proper functionality or potential malfunction. The resulting signals are interpreted and plotted using the programming interface of MATLAB. The efficiency of the resulting wiring is tested on real pacemakers and compared to the values of commercial programmers. The system is designed for easy and universal measurement of pacemaker parameters for learning purposes in the teaching process.
Electromagnetic Field in Vicinity of Electronic Baby Monitor
2020 ELEKTRO, 2020
Usage of devices emitting electromagnetic (EM) radiation on everyday basis leads to almost ubiqui... more Usage of devices emitting electromagnetic (EM) radiation on everyday basis leads to almost ubiquitous exposition to the EM field for everyone. The knowledge of the values of surrounding EM field may help to estimate the exposure and bring the better understanding of the effects. Main topic of presented paper deals with measurement and simulation of the electric field near the electronic baby monitor under standard condition. Chosen electronic monitor works at a frequency of 1900 MHz. Obtained values do not exceed the limits set by the regulation. However, some caution should be exercised when using such devices, in particular regarding keeping a safe distance from the little children.
Ultrasound based distance measurement and assessment of obstacles in the area – a concept for educational purposes
2020 ELEKTRO, 2020
This paper describes a distance measurement process, tracking the environment, and determining th... more This paper describes a distance measurement process, tracking the environment, and determining the presence of space obstacles. The ultrasonic module HC-SR04 is used to measure the distance. This module is complemented by a servo motor, which allows gradual monitoring of the surroundings. The way of signaling obstacles in the space is realized via the vibrating motor. All information about the measured distance is then transmitted to the computer via the Bluetooth module, where is created graphical user interface in the MATLAB program. The system is designed to enable orientation in space for people with visual impairments.
Experimental Identification of 316L Stainless Steel’s Artificial Fatigue Cracks by Eddy Current Method
2020 ELEKTRO, 2020
The paper deals with the issue of electromagnetic non-destructive investigation of real fatigue d... more The paper deals with the issue of electromagnetic non-destructive investigation of real fatigue defects of conductive materials. Austenitic stainless steel of grade AISI 316L is investigated by the eddy current method. Harmonic excitation is used for driving of the exciting coils. Presented fatigue cracks are induced by the three-point bending of the plates on the cycling machine with predefined loading process parameters. The gained response signals of the investigated regions of interest are graphically presented and discussed in the article.
A piezoelectric Foil Sensor used for Arterial Pulse Measurement
The article deals with principle of the heart activity measurement using a piezoelectric sensor. ... more The article deals with principle of the heart activity measurement using a piezoelectric sensor. There is an information about design of the device serving for arterial pulse wave measurement. The device allows conversion of an electrical charge from the piezoelectric sensor and offers analog signal preprocessing. The signal is later digital processed to achieve a heart rate of the measured subject.
Investigation of Artificial Cracks by Sweep Frequency Eddy Current Testing
The article deals with the utilization of the sweep frequency eddy current technique as an altern... more The article deals with the utilization of the sweep frequency eddy current technique as an alternative method for material crack evaluation. The new eddy current probe is designed and presented. Experimental measurements are carried out to evaluate resolution of the probe while the harmonic signal is used for the excitation. The gained results are presented and discussed in the paper.
Sweep frequency eddy current testing: numerical simulation of various probe types
2021 22nd International Conference on Computational Problems of Electrical Engineering (CPEE)