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Wyświetlanie 1-15 z 48
Tytuł:
Identification of the reinforcement bars in concrete samples using eddy currents thermography
Autorzy:
Różański, Leszek
Ziopaja, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/114038.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
active IR thermography
eddy currents
reinforcement bars
Opis:
It is known that sub-surface discontinuities of matter, internal voids, inclusions of other materials or delaminations of the structure can be revealed on the surface temperature distribution. An important element of IR thermography investigations is the application of an appropriate heat source to heat the examined object. This article discusses the use of eddy currents for identification of reinforcing bars in concrete samples. The experiments have the laboratory character and are used primarily for qualitative assessment of the influence of bar diameter and concrete cover thickness on the identification of reinforcement in concrete elements. In order to induce a transient heat flow in tested samples, the eddy currents (EC) generator from IFF GmbH was used. After the pulse was completed, the surface temperature distribution was recorded using FLIR T620 infrared camera. The following experimental studies validate the practical application of active IR with EC to locate and assess the technical condition of reinforcing bars in reinforced concrete structures in buildings and civil engineering structures.
Źródło:
Measurement Automation Monitoring; 2019, 65, 2; 55-59
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of IR thermography for testing the operation parameters of water radiant ceiling systems for heating
Autorzy:
Sornek, K.
Gradzik, I.
Rzepka, K.
Filipowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/114128.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
IR thermography
radiant ceiling system for heating
Opis:
This paper shows the possibility of the use of IR thermography for testing the operational parameters of water radiant ceiling systems for heating. The study showed positive results regarding the efficiency of different types of ceiling panels in a function of the level of homogeneous surface temperature distribution. Experimental results were supplemented by theoretical calculations performed with the use of a special equation originally dedicated to sun collector calculations.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 228-232
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-destructive evaluation of sandwich plates by an ultrasonic IR thermographic method
Autorzy:
Świderski, W.
Hłosta, P.
Chuda-Kowalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/114699.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
non-destructive testing
IR thermography
sandwich panels
Opis:
The paper presents the possibility of using an ultrasonic IR thermographic method to detect internal defects in composite types of sandwich panels with metal sheets. Experimental results indicate that this method may in many cases be effective in detecting defects that weaken the structure of sandwich panels. The results also show the limitations of using this method to sandwich panels and the materials used in them.
Źródło:
Measurement Automation Monitoring; 2016, 62, 12; 406-410
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of very thin defects in CFRP by the lock-in thermography method
Autorzy:
Świderski, W.
Powiązania:
https://bibliotekanauki.pl/articles/247348.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
non-destructive testing
composite material
IR thermography
Opis:
Quick development of constructional composite materials application is caused by their excellent mechanical and strength-related properties, combined with a low specific weight. One of the basic groups of reinforcement materials in composites are carbon fibres discovered back in 19th century. The main reason of defects in structures of composite materials is the variability of working charges in constructions during the process of using. Existed defects are complicated because of the effects like loss of continuity of reinfused fibres, binder cracks and loss of fibres adhesiveness to binder. Diagnostic methods, which are effective with relation to metals became little effective when used in detection of defects in composite materials. This caused greater interest of diagnostic techniques with using infrared thermography. Lock-in thermography is one of NDT methods providing phase images of thermal waves in a sample leading to receiving a distribution of internal defects and allowing for thermal properties evaluation. We used lock-in thermography in connection with modulated thermal source synchronized with the IR image acquisition camera. It was prepared sample of multilayer structure carbon composite with deliberately introduced defects for comparative purposes. Very thin defects of different sizes and shapes made of Teflon or copper having a thickness of 0.1 mm were searches. The results are reported in the paper.
Źródło:
Journal of KONES; 2016, 23, 1; 385-390
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermographic method based accelerated fatigue limit calculation for steel X5CRNI18-10 subjected to rotating bending
Autorzy:
Lipski, A.
Powiązania:
https://bibliotekanauki.pl/articles/259472.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
fatigue limit
reversed bending
IR thermography
staircase method
Opis:
The article presents an accelerated method for fatigue limit calculation which makes use of constant temperature increase rate observed in the middle time interval of specimen fatigue loading. The examination was performed on specimens prepared from drawn rods made of corrosion resistant austenitic steel X5CrNi18-10 (1.4301) subjected to rotating bending. For comparison purposes, the fatigue limit was also calculated with the aid of the Staircase method, using 30 specimens and assuming the base number of cycles equal to 10・106. Three specimens were used for accelerated examination during which their temperature was measured with the aid of the thermographic camera CEDIP Silver 420M (FLIR SC 5200). The applied loads were gradually increased until specimen damage took place. Based on the analysis of temperature changes during specimen loading, the average rate of temperature increase at successive loading stages was assessed. The obtained results were then approximated using the 2-nd order curve and its minimal value was assumed as corresponding to the fatigue limit. The performed statistic test has revealed that the fatigue limit calculated in the above way does not differ substantially from that determined using the Staircase method.
Źródło:
Polish Maritime Research; 2015, 4; 64-69
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IR Thermography methods on nondestructive testing of ballistic covers made of multi - layer carbon fiber
Autorzy:
Hłosta, P.
Świderski, W.
Szudrowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/244251.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
IR thermography
light armour
CFRP composite
nondestructive testing
Opis:
Presently a lot of designs of light armours are based mainly on the multilayer composite materials. Thanks to these materials it was possible to achieve highest levels of ballistic resistance of specific armour at limited weight. The weight (area density) and the performance have direct influence on the value of combat ability of equipment and soldiers. Carbon fibers are basic types of reinforcement used in composites. They have many technical applications including light ballistic covers where they are mostly used as multi-layer composite materials constituting a structure made of several interconnected layers or many layers of carbon fibers, or in combination with other materials. Light ballistic covers have usually thickness of several to 10-20 mm and potential defects occurring in them have thermo-physical properties definitely different than materials they are made of so the non-destructive tests using thermography methods may be effective in detecting these defects. The main methods of active thermographic tests are as follows [1, 2]: - Pulsed Thermography – PT, - Step Heating Thermography – SHT, - Lock-in Thermography – LT, - Vibrothermography – VT. In the paper an application of Step Heating Thermography and Vibrothermography to detection of delaminating area of CFRP composites after mechanical impacts is presented.
Źródło:
Journal of KONES; 2013, 20, 2; 167-173
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aramid composites after fragment-proof test by ultrasonic ir thermography
Autorzy:
Pracht, M.
Świderski, W.
Powiązania:
https://bibliotekanauki.pl/articles/245923.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ultrasonic IR thermography
composite material
aramid fabrics
ballistic protection
Opis:
Modern soft ballistic armour is composed of high-strength fibres often used as packages of loose fabrics or laminates. These fibres include carbon, glass fibres, polymer fibres including aramid fibres and polyethylene fibres. Soft armour is applied to provide ballistic protection typically against the impact of small arms projectiles and fragments. In order to determine the level of ballistic protection for ballistic armour, fragment-simulating projectiles (FSP) are used which simulate the properties of fragments created during the explosion of various types of grenades and projectiles. The above-mentioned composites can include a variety of defects such as manufacturing defects, moisture ingress, projectiles impact and other defects. Infrared thermography is a method, which can be used to non-destructive testing and detecting defects of this type of material. However, ultrasonic stimulation is one of method of thermal stimulation used for detection defects in composite. The article presents the results of experimental research of multilayer aramid composite after fragment-proof tests by ultrasonic IR thermography method.
Źródło:
Journal of KONES; 2017, 24, 2; 191-195
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie termograficznych metod pomiaru temperatury w diagnostyce termicznej obiektów i urządzeń energetycznych
Thermographical Methods of Temperature Measurements Applications inj Thermal Diagnostics of Electric Power Devices
Autorzy:
Różański, L.
Powiązania:
https://bibliotekanauki.pl/articles/151882.pdf
Data publikacji:
2004
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
diagnostyka termalna
termografia w podczerwieni
thermal diagnostics
IR thermography
Opis:
W pracy przedstawiono możliwości wykorzystania termograficznych metod pomiaru temperatury w diagnostyce termicznej obiektów i urządzeń energetycznych. Uwagę skoncentrowano na diagnostyce bazującej na termografii w podczerwieni. W skrócie omówiono metodykę badań oraz kryteria diagnostyczne stosowane w Energetyce Poznańskiej S.A. Przedstawiono własne doświadczenia związane ze stosowaniem systemów termograficznych krótkofalowych (SW) i długofalowych (LW). Wymieniono problemy badawcze, których rozwiązanie może zwiększyć efektywność diagnostyki termalnej w energetyce. Opisano stanowisko przeznaczone do okresowego wzorcowania i sprawdzania właściwości metrologicznych systemów wykorzystywanych w diagnostyce termalnej.
Possibilities applications of radiational methods of temperature measurements in thermal diagnostics of the electrical power devices have been presented. Special attention has been concentrated on IR thermography. Methods of investigations and diagnostically criterions have been shown. Own experiences connected with usage of LW and SW IR systems has been presented. A computerised measuring system intended for among others thermographs calibration and examination of metrological features of these devices has been described.
Źródło:
Pomiary Automatyka Kontrola; 2004, R. 50, nr 2, 2; 36-39
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykrywanie min metodami termografii w podczerwieni
Mine detection with IR thermography methods
Autorzy:
Świderski, W.
Hłosta, P.
Powiązania:
https://bibliotekanauki.pl/articles/157246.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
termografia w podczerwieni
mina
mikrofale
IR thermography
mine
microwaves
Opis:
Zakopane obiekty powodują zakłócenia w rozkładzie parametrów cieplnych gleby. W naturalnych warunkach wymiany ciepła mogą powstać ślady termiczne poszukiwanych obiektów na powierzchni gleby w zobrazowaniu cieplnym. Dodatkowe zastosowanie źródła mikrofalowego zwiększa prawdopodobieństwo wykrywania zakopanych obiektów metodą termografii w podczerwieni. W artykule przedstawiono zarówno wyniki symulacji komputerowej jak i badań eksperymentalnych tego zagadnienia.
Many factors limit the efficiency of buried object detection by thermal methods. Underground objects create disturbances in the distribution of thermal parameters of the soil. Natural conditions of heat exchange can create a suitable thermal image on the soil surface - in the form of a wanted trace in the thermal image. The solar energy is the main source delivering heat to the soil. The range and character of changes of the heat stream and rate of accumulation in the soil on a given day depend on three factors: atmospherical conditions, the kind of surface and the properties of thermal soil. The active IR thermography method can increase probability and accelerate the detection. This method is used as one of the methods for nondestructive testing of different materials. The problem of detecting objects buried in the soil can be treated as a special case of detecting subsurface heterogeneity of a material. The active IR thermography method requires the use of a source of thermal stimulation to heat the tested objects. A microwave source was used to increase the probability of detecting the buried objects by this method. In this paper the results of such a computer simulation and experimental testing are presented.
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 9, 9; 897-900
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of image analysis methods on the example of ultrasonic thermography of an aramid composite
Autorzy:
Świderski, Waldemar
Powiązania:
https://bibliotekanauki.pl/articles/244857.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
non-destructive testing
composite material
IR thermography
image analysis
Opis:
Infrared thermography using ultrasound thermal excitation of the tested material is one of the most effective methods in non-destructive testing of a multi-layer aramid composite. This type of material is very popular in the construction of light ballistic armours. Typical defects are delamination between layers of aramid fabric joined by resin. They are usually filled with air. Delamination located deep under the surface of the test generates very weak temperature signals. They are often at the level of noise. To reduce the impact of noise on the detection of a defect, special methods of image analysis (thermograms) are used. Such methods include principal component analysis and wavelet analysis. Principal Component Analysis is a relatively new procedure of statistical data treatment, which is becoming increasingly popular in non-destructive testing. Mathematically, it is often regarded as implementation of the so-called singular values decomposition technique, which allows extracting of spatial information from a matrix of source data. The wavelet analysis is an integral transform, which represents the convolution of an analysed process with a special mother function called wavelet. Wavelets are characterized by two parameters: scale and shift. The paper presents a comparison of the efficacy of these methods in the detection of defects in the multilayer composite reinforced aramid fibre.
Źródło:
Journal of KONES; 2019, 26, 2; 145-150
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Characterization of High-Frequency Flyback Power Transformer
Autorzy:
Kasikowski, R.
Gołaszewski, J.
Więcek, B.
Farrer, M.
Powiązania:
https://bibliotekanauki.pl/articles/114581.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
IR thermography
power losses
H-F flyback transformer
thermal impedance
Opis:
This paper presents preliminary thermographic measurements and a simple thermal analysis of power losses in high-frequency (H-F) transformers used in AC-DC power converters. The analysis is based on complex thermal impedance and time constant distribution. The main aim of this research was to consider quantitatively the contribution of different power losses in the H-F transformer, including fringing flux effect.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 237-241
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical assessment of accuracy of thermographic indirect measurements
Autorzy:
Pacholski, K.
Więcek, B.
Powiązania:
https://bibliotekanauki.pl/articles/114508.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
errors and uncertainty
infra-red (IR) thermography
emissivity metallurgy
slag
Opis:
: In this paper, the basis of error and uncertainty assessment for thermographic measurement of temperature is presented. An engineering simplified analytical approach of determining the coverage coefficient is described for different number of thermal images taken into analysis and different contributions of A and B-type of uncertainties. In the form of an example, the entire procedure of uncertainty assessment was used for emissivity. The exemplary calculus are presented for emissivity in LWIR spectral range.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 278-281
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic eye corners detection and tracking algorithm in sequence of thermal medical images
Autorzy:
Strąkowska, M.
Strąkowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/114658.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
eye corners detection
point tracking
IR thermography
thermal image processing
Opis:
The article presents automatic eye corners detection algorithms in thermal images. Its target application is to perform quick and unnoticed measurement of human body temperature. It is proved that the temperature of eyes’ corners is the most reliable and stable temperature considering infrared imaging. That measurements were done manually so far. Our approach is to do this automatically and create complete system for measurement of core human body temperature in crowded places where it is impossible to do this in another way (for example on the airport, railway station). Such system could prevent people for spreading off the epidemic. Two proposed algorithms are presented: first based on morphological operations and geometric features of human face, second based on the cross-correlation and idea of pattern tracking. The selection of appropriate ROI size for reliable temperature extraction was tested according to the distance to person under observation.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 199-202
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Various applications of complex thermal impedance for transient and AC heat transfer analysis
Autorzy:
Więcek, B.
De Mey, G.
Strąkowska, M.
Chatziathanasiou, V.
Gmyrek, Z.
Strzelecki, M.
Chatzipanagiotou, P.
Powiązania:
https://bibliotekanauki.pl/articles/114707.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermal impedance
Nyquist plot
Laplace transform
heat transfer
IR thermography
Opis:
This paper presents the concept and three practical examples of using complex thermal impedance for characterisation different thermal objects. The first problem describes estimation time shift between power and temperature in electric distribution systems with non-sinusoidal currents. The second example discussed here, shows the estimation of power losses distribution in the magnetic punched ferromagnetic strips. The third application presents the inverse thermal modelling of 3-layer biomedical objects (tissues) to estimate the thermal parameters. More details of the presented problems are in the appropriate papers of the authors referenced here.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 210-214
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non - standard methods of data processing in thermographic non - destructive testing of light ballistic protections
Autorzy:
Swiderski, W.
Szudrowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/247994.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
light ballistic protection
IR thermography
non-destructive testing
data processing
Opis:
IR thermography is a technique used to detection, registration, processing and visualization of invisible infrared radiation emitted by a tested object. Image (thermogram) is a result of this technique and it maps the distribution of temperature on surface of tested object. The image after entering in digital form into the computer needs to get certain treatments on it to separate information of interest through its processing. A characteristic feature of image processing is that the image exists at either the input or output of information processing. The output images should be free from disturbances and they should have distinctly separated features of interest. After the initial processing of the image, the next steps of its analysis follow. In the result of the analysis quantitative data is received that describes some determined features of the image and the complete image comprising hundreds details is substituted by a limited population of separated features. This population can be used effectively by different recognition methods and algorithms. In thermographic investigations, situations occur when treatment of images applied in standard software is not fully efficient to obtain information, which is "camouflaged" in taken thermogram. Such event takes place particularly in the case of looking for thermal "disturbances" onto the surface, which are caused by the undersurface defects. Such situation needs the application of special transformations carried out on thermograms. These transformations lead to selecting from all information included in the thermogram only such part of it that is essential from the point of view of conducted tests. In such case it is required the usage of advanced data processing techniques like thermal tomography, one-dimensional Fourier analysis, principle component analysis (PCA), an approximation by means of polynominals, wavelet analysis, neural network and reconstruction of thermographic signal. In this paper, these methods are described and examples of their use in tests of light ballistic protections are presented.
Źródło:
Journal of KONES; 2012, 19, 1; 431-440
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 48

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