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Wyświetlanie 1-15 z 31
Tytuł:
Device for emissivity estimation in LWIR range
Autorzy:
Olbrycht, R.
Powiązania:
https://bibliotekanauki.pl/articles/114198.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
emissivity
infrared
thermal camera
Opis:
The paper deals with the influence of emissivity on infrared measurements (Tab. 1; Fig. 1-3) and presents the developed device for emissivity estimation (Fig. 4). There is comparison shown between the reference emissivity values measured with thermal camera (Fig. 5) and estimated with the developed device (Tab. 2). Obtained results are in good agreement for three examined samples with emissivity ranging from 0.1 to 0.95.
Źródło:
Measurement Automation Monitoring; 2017, 63, 3; 90-93
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing coatings of reflecting infrared radiation for a target for night shooting
Autorzy:
Swiderski, Waldemar
Hłosta, Paweł
Polak, Grzegorz
Tymiński, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/114598.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermal target
infrared
emissivity
shooting
Opis:
The paper presents the principle of operation of a new night-shooting target. Because this target requires a covering that reflects the infrared radiation flux generated by the reflector from its surface, testing of different variants of the cover and the shape of the target surface has been carried out. Emissivity is a physical parameter characterizing the radiant properties of real bodies. The emissivity coefficient of extruded aluminum sheet samples covered with a layer of green colored aluminum oxide was determined. The aluminum oxide layer was applied using two different technologies being galvanic and anodizing.
Źródło:
Measurement Automation Monitoring; 2019, 65, 2; 41-43
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Work on developing a thermal shooting target
Autorzy:
Swiderski, W.
Hłosta, P.
Polak, G.
Tymiński, D.
Powiązania:
https://bibliotekanauki.pl/articles/114252.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermal target
infrared
emissivity
shooting
Opis:
The paper presents work on the development of a thermal target providing for shooting with the use of night-vision and thermovision sights in night conditions as well as during the day, without changing the target. The image of the target in the night sight is visible by illuminating it through an IR lamp. The target is designed so that the reflected IR stream is directed towards the objective lens. Compared to existing solutions, the new thermal target has a number of advantages, such as it does not require long-time heating and is immediately ready to operate after thermal lamp lighting, significantly reducing energy consumption. The project is currently at the stage of prototype target testing.
Źródło:
Measurement Automation Monitoring; 2017, 63, 4; 158-161
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Appointing of surface topography parameters to describe the diffuse reflective properties of selected dielectrics
Autorzy:
Majchrowski, R.
Rozanski, L.
Grochalski, K.
Powiązania:
https://bibliotekanauki.pl/articles/114434.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermographic measurements
surface topography
emissivity
reflection
Opis:
The investigations have been performed in order to choose the specific roughness parameters, which would inform the customer about the diffuse emissive and reflective characteristics of the adhesive tapes used in the thermographic measurements. To achieve that, a series of the surface topography parameters of various adhesive tapes (i.e. objects with diffusive reflective characteristics) and various glass plates (i.e. objects with directional reflective characteristics) has been examined. For the analysis of surface topography the following parameters were selected: Sdr (the Developed Interfacial Area Ratio) and Sdq (the Root Mean Square Surface Slope). These selected parameters seem to be most suitable to describe the properties of the surface in the discussed aspect.
Źródło:
Measurement Automation Monitoring; 2017, 63, 3; 78-81
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compatibility of the λ- Kolmogorov test for the brake disc emissivity factor distribution in thermal imaging studies
Autorzy:
Sawczuk, W.
Pagórek, B.
Powiązania:
https://bibliotekanauki.pl/articles/114266.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
emissivity factor
brake disc
exponential distribution
Opis:
A thermal imaging camera is widely used in railway, it allows evaluating the wheel-rail contact while rolling the wheel set on the rails [3], cracks of the railway tracks [22] or identify overheated axle bearings of the wheel sets of the railway cars. In studies of braking systems both railway and vehicular ones on brake positions, the thermal imaging measurements are little used. Only in the qualitative assessment, an IR camera can identify the phenomenon of "hot spots" on the brake disc [1, 12, 15]. When testing the disc brake friction pairs, the most difficult is the brake disc and determination of its actual temperature which, due to the polished smooth surface by friction with the friction pad, is a low-carbon object. This type of objects force the person who makes the measurements to do a very precise configuration of the thermal imaging camera in order to determine the emissivity factor. An additional difficulty in the thermal imaging of braking systems is a dynamically changeable nature of the work associated with changes in the rotational speed of the brake disc and a nonlinear increase in its temperature. The paper presents the results of the studies conducted parallel with the thermal imaging measurements by using thermocouples to determine variability of the experimental emissivity factor of the brake disc supported by the λ-Kolmogorov compatibility test.
Źródło:
Measurement Automation Monitoring; 2016, 62, 2; 56-61
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of selected physical, chemical and biological properties of selected materials intended for contact with human body
Autorzy:
Mrówka, Maciej
Machoczek, Tomasz
Jureczko, Paweł
Szymiczek, Małgorzata
Skonieczna, Magdalena
Marcoll, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/778721.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
absorption
hardness
biocompatibility
structural materials
emissivity
Opis:
The purpose of the conducted study was to analyse new materials intended for contact with the human body in view of their physical, chemical and biological properties. The authors have put to test six commercially available materials, four out of which were composite polyamide 12-based materials, while two were polyurethanes. The examined materials were assessed in terms of the surface. Subsequently, their hardness and biocompatibility were tested. The authors devoted major attention to the tests of absorption and emissivity of water, the pH = 7.4 PBS buffer solution and pH = 4.3 artificial sweat in temperatures of 21°C and 37°C. The results of the tests have confirmed the non-toxicity of all the tested materials and allowed to provide their characteristics in terms of their surface, hardness, as well as absorption and emissivity of various body fluids. Both polyamide 12 and the tested polyurethanes are classified as thermoplastics that may be used in additive technology.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 1; 1-8
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emissivity measurement of black paint using the calorimetric method
Autorzy:
Pelińska-Olko, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/27312234.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
calorimetric method
emissivity
thermosensitive materials
polymers
plastics
Opis:
The paper is of practical importance and describes the construction of a test rig and the measurement method for determining the relative emissivity coefficient of thermosensitive thin polymer coatings. Polymers are high-molecular chemical compounds that produce chains of repeating elements called ‘mers’. The polymers can be natural and artificial. The former ones form the building material for living organisms, the latter – for plastics. In this work, the words plastics and polymers are used as synonyms. Some plastics are thermosensitive materials with specific physical and chemical properties. The calorimetric method mentioned in the title consists of two steps. The first stage, described here, involves very accurately measuring the emissivity of black paint with the highest possible relative emissivity coefficient, which covers the surface of the heater and the inner surface of the chamber. In the second step, the thermosensitive polymer will be placed on the inner surface of the chamber, while black paint with a known emissivity coefficient will remain on the heater. Such a way of determining the properties of thermosensitive polymers will increase the error of the method itself, but at the same time will avoid melting of the polymer coating. During the tests, the results of which are presented in this work, the emissivity coefficient of the black paint was obtained in the range of 0.958–0.965.
Źródło:
Archives of Thermodynamics; 2023, 44, 3; 161--177
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction of the impact of emissivity on high temperature measurements in non-contact thermometric devices
Autorzy:
Lisiecka, E.
Powiązania:
https://bibliotekanauki.pl/articles/174988.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
emissivity impact
high temperature measurements
non-contact thermometer
Opis:
Non-contact measurements of high temperature, accomplished with the use of infrared cameras and pyrometers, are utilized in many fields of science and industry. However, in order to obtain reliable measurement results from aforementioned devices, one should take account of the emissivity value of a thermal source the temperature of which is being measured. This is due to the necessity of calibration of non-contact thermometric devices in relation to emission characteristics of a blackbody, which is an ideal source with the maximum emissivity value. In order a non-contact temperature measurement was made possible without the necessity of taking into account the emissivity value, an original concept of the measurement method was developed, taking the advantage of thermal radiation laws – Planck’s law and Wien displacement law. The basic idea of the accepted method is the departure from amplitude recording (as in “conventional” pyrometry and thermovision) for linking of temperature recording with a maximum position in Planck’s curve. This article presents a novel approach that was used in the development of an original algorithm of temperature determination for performance of non-contact measurements of high temperature. The algorithm will enable to perform measurements without the necessity of introducing the emissivity value of a radiation source into a measurement instrument and will limit the impact of radiation absorption via the medium in which a measurement is being performed on the results of measurements. The applied methodology will allow conducting non-contact temperature measurements at a distance without the necessity of calibration the measuring device with regard to a blackbody.
Źródło:
Optica Applicata; 2017, 47, 3; 373-381
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining of a passenger car fire temperature
Autorzy:
Szajewska, A.
Świder, R.
Rybiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/114316.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
emissivity
thermal camera
thermogram
fireman
fire environment
firefighting
Opis:
A fire test was carried out. In the test a lift back passenger car with LPG system was burnt. Fire footprints, visible only in IR were observed with a thermal camera. Temperature was measured at specific points of the car and results were presented in graphs. Comparative measurements of surface temperature were taken by a thermocouple and thermal camera. Value of emissivity coefficient was delimited using ThermaCAM Researcher programme, by Flir Co.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 275-277
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining the emissivity at the tool-chip interface during S235JR steel turning
Autorzy:
Molenda, J.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/242890.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
turning
infrared measurement
tool-chip interface temperature
emissivity
Opis:
Temperature on the chip-tool interface is important parameters in the analysis and control of turning process. Due to the high shear and friction, energies dissipated during a machining operation the temperature in the primary and secondary shear zones are usually very high; hence, affect the shear deformation and tool wear. In a single point cutting, heat is generated at three different zones i.e. primary shear zone, chip tool interface and the tool-workpiece interface. The primary shear zone temperature affects the mechanical properties of the work piece – chip material and temperatures at tool-chip and tool-work piece interfaces influence tool wear at tool face and flank respectively. Total tool wear rate and crater wear on the rake face are strongly influenced by the temperature at chip-tool interface. Therefore, it is desirable to determine the temperatures of the tool and chip interface to analyse or control the process. To measure the temperature at the tool-chip interface many experimental methods have been developed over the past century. Since at the interface there is a moving contact between the tool and chip in this work, authors propose infrared method for temperature measuring. To assure possibly high accurate of noncontact temperature measurement there is a need to keep in mind several factors, including determining appropriate value of emissivity. In this work, authors present results of experimental determining emissivity value of tool-chip interface. As initial value, emissivity of polished steel was taken.
Źródło:
Journal of KONES; 2015, 22, 2; 149-154
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Design Concept of the Laboratory Heater for Studying the Effect of Surface Topography to Emissivity
Autorzy:
Majchrowski, R.
Grochalski, K.
Rozanski, L.
Powiązania:
https://bibliotekanauki.pl/articles/114567.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
temperature control
PID control
laboratory heater
emissivity
surface topography
Opis:
Remote temperature sensing and thermal imaging systems [1, 2] are invaluable tools in various fields of science and technology. The fact that radiation is a function of object surface temperature makes it possible for remote temperature measurement systems to calculate this temperature. However, to measure temperature accurately with IR system, it is necessary to know emissivity. Emissivity is one of the major sources of error in radiometric measurements. Generally, emissivity is not constant as it depends on several parameters: temperature, viewing angle, wavelength, contamination or roughness. The article presents a laboratory heater which can be used to measure the thermal emissivity ε depending on the sample surface topography.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 176-179
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emissivity of the one - plate lapping machine tool
Autorzy:
Molenda, J.
Barylski, A.
Powiązania:
https://bibliotekanauki.pl/articles/248024.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
lapping
infrared measurement
lapping plate temperature
lapping parameters
emissivity
Opis:
A number of precision manufacturing applications use lapping process as a critical technology to achieve thickness tolerance and surface quality specification. Typical examples of the processed components are pump parts, transmission equipments, cutting tools, hydraulic and pneumatics, aerospace parts, inspections equipment, stamping and forging. Lapping leads to a surface with low roughness and high precision. It is carried out by applying loose abrasive grains between work and lap surfaces, and causing a relative motion between them resulting in material removal. The grains activities in the working gap cause also temperature rise of the executory system elements, including lap plate. Because of required parts accuracy tool flatness is the key to the successful machining. To avoid its excessive thermal expansion, plate temperature research was taken. Temperature is the most often measured physical quantity, second only to time. All advantages of infrared technology have led it to become frequently used technique for temperature measurement. It was also used by authors for lapping process observation. To assure accurate noncontact infrared temperature measurement there is a need to keep in mind several factors, including determining appropriate value of emissivity. Incorrectly, designated emissivity results in bigger measuring error. This work presents a method for determining wheel emissivity and its value obtained by presented way. To find emissivity of the lapping plate infrared camera V-20 II produced by VIGO System S.A. and contact thermometer TES1312 Dual K-Type were used. The experiments were carried out on a plate-lapping machine ABRALAP 380 with a grooved cast-iron lapping plate and three conditioning rings. The determined emissivity was equal 0.95 and was bigger than value from the table, as was expected. During lapping wheel surface is in fact very dark due to charging and covering the waste slurry. Obtained value will be used in future measurements.
Źródło:
Journal of KONES; 2012, 19, 1; 283-288
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of a radiated heat exchanger surface on heat transfer
Autorzy:
Morel, S.
Powiązania:
https://bibliotekanauki.pl/articles/240062.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat exchanger
reciprocal emissivity coefficient
wymiennik ciepła
współczynnik emisyjności
Opis:
The experiment leads to establish the influence of radiated surface development heat exchangers on the values of heat flux transferred with water flowing through the exchangers and placed in electric furnace chamber. The values of emissivity coefficients are given for the investigated metal and ceramic coatings. Analytical calculations have been made for the effect of the heating medium (flame) – uncoated wall and then heating medium (flame) – coated wall reciprocal emissivity coefficients. Analysis of the values of exchanged heat flux were also realized. Based on the measurement results for the base coating properties, these most suitable for spraying the walls of furnaces and heat exchangers were selected, and determined by the intensification of heat exchange effect. These coatings were used to spray the walls of a laboratory waste-heat boiler, and then measurements of fluxes of heat absorbed by the cooling water flowing through the boiler tubes covered with different type coatings were made. Laboratory tests and calculations were also confirmed by the results of full-scale operation on the metallurgical equipment.
Źródło:
Archives of Thermodynamics; 2015, 36, 3; 161-174
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inverse Solution to the Vertical Plate Cooling by Radiation and Convection in Air
Autorzy:
Hadała, Beata
Malinowski, Zbigniew
Gołdasz, Andrzej
Cebo-Rudnicka, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/2134090.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
convection heat transfer
radiation heat transfer
plate emissivity
vertical plate
Opis:
The inverse solution to the heat flux identification during the vertical plate cooling in air has been presented. The developed solution allowed to separate the energy absorbed by the chamber due to radiation from the convection heat losses to air. The uncertainty tests were carried out and the accuracy of the solution has been estimated at a level of 1%-5% depending on the boundary condition model. The inverse solution was obtained for the temperature measurements in the vertical plate. The stainless-steel plate was heated to 950°C and then cooled in the chamber in air only to about 30°C. The identified heat transfer coefficient was compared with the Churchill and Chu model. The solution has allowed to separate the radiation heat losses and to determine the Nusselt number values that stay in good agreement with the Churchill and Chu model for a nearly steady-state air flow for the plate temperature below 100°C.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1167--1178
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
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
Wyświetlanie 1-15 z 31

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