Michal Svantner

Michal Svantner
University of West Bohemia · New Technologies - Research Centre

Ph.D.
Researcher at University of West Bohemia / NTC https://www.ntc.zcu.cz/en/

About

85
Publications
7,099
Reads
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302
Citations
Introduction
Senior researcher at New Technologies - Research Centre, University of West Bohemia, focused on thermography, thermographic testing and temperature measurement.
Additional affiliations
June 2016 - present
CEN - European Committee for Standardization
Position
  • Expert
Description
  • unpaid membership
January 2012 - present
University of West Bohemia
Position
  • Group Leader
Description
  • active thermography and infrared testing, measurement of residual stresses, measurement of thermo-mechanical processes, data processing and result evaluation, research results publication
September 2001 - present
University of West Bohemia
Position
  • Researcher
Description
  • Selected seminars on Measurement in physical technologies and Modelling of thermal processes in physical technologies
Education
September 2000 - September 2005
University of West Bohemia
Field of study
  • Ph.D. – Dept. of Physics, Plasma physics and physics of thin films (Residual stress determination in multi-layer structures)
September 1994 - September 2000
University of West Bohemia
Field of study
  • Ing. (MSc.) – Faculty of Applied Sciences, Physics of technological processes and physical technology

Publications

Publications (85)
Article
This study introduces a novel approach to the presentation of the probability of detection (POD) function in infrared (IR) thermographic nondestructive testing. The modified POD is suggested as a function of two defect parameters, namely, defect depth and lateral size. The proposed approach is based on calculating theoretical values of maximum temp...
Article
Full-text available
The paper deals with a new approach to laser thermography for the inspection of coating thickness. The approach is based on scanning the specimen surface point by point, using a low-power laser, and recording the temperature responses with an IR camera. A recorded sequence is then transformed into a sequence similar to a flash pulse thermography se...
Article
Full-text available
ncreased temperature in humans is one of symptoms of infectious diseases. Infrared thermography is a popular method for measuring temperature as it offers fast and non-contact temperature measurement. However, and despite many advantages, its real accuracy for human temperature measurement is not sufficient in many cases. This study was focused on...
Article
Full-text available
Thermographic flash-pulse inspection is one of popular methods of non-destructive testing (NDT) of materials. Despite the automation of the NDT methods, most of them are based on visual inspections and results of these inspections are influenced by the skills of operators. The repeatability and reproducibility (R&R) of these inspections are therefo...
Article
Full-text available
This study is focused on the quantitative estimation of defect depth by applying pulsed thermal nondestructive testing. The majority of known defect characterization techniques are based on 1D heat conduction solutions, thus being inappropriate for evaluating defects with low aspect ratios. A novel method for estimating defect depth is proposed by...
Article
Flash-pulse thermography is active thermography testing method, which is based on thermal excitation and response analysis of a tested sample. It is the traditional method for a non-destructive inspection of discontinuities and inhomogeneities at a sample surface, which is also applicable for a qualitative inspection of coating thickness variations...
Patent
The device for infrared non-destructive testing of materials consists of a working unit (1,9,12,15), in which radiation sources (5,18) and at least one thermographic camera (3) are integrated. These sources (5,18) and the thermographic camera (3) or cameras (3) are arranged in the front surface (8,16) of the working unit (1,9,12,15). The working un...
Article
Full-text available
Pulsed thermography is a common technique for nondestructive testing (NDT) of materials. This study presents the apparent effusivity method for the quantitative evaluation of coating thickness in a one-sided thermal NDT procedure. The proposed algorithm is based on determining a threshold value of apparent effusivity, which can be found for particu...
Article
The paper deals with flash-pulse thermography, which is one of the most used thermographic inspection methods. The method is based on flash excitation of an inspected object and an analysis of its thermal response recorded by an infrared camera. This paper deals with a time-power transformation method (P-function) for an evaluation of the flash-pul...
Article
Thermographic testing is an inspection method, which primarily indicates the presence of discontinuities in a tested sample. Its application to coatings can indicate a presence of local thickness variations; however, it mostly does not bring any quantitative information about the thickness of the coatings. This contribution is focused on a quantifi...
Conference Paper
Full-text available
The contribution describes a fast contactless measurement of a paint thickness non-uniformity using flash pulse thermography. Specimens sprayed by a paint were thermally excited by a flash lamp and temperature responses were recorded by an infrared camera. The recorded sequences were post-processed with Fast Fourier Transform to obtain phase angles...
Article
Full-text available
Numerical simulation of industrial reheating furnaces belongs to important procedures for an optimization of their design and processing parameters. A 3D numerical model of a continuous gas burners heated walking-beam furnace is introduced in this paper. The main benefit of the model is a compromise between its complexity and computing speed. The m...
Conference Paper
Full-text available
Proceedings 2019, 27(1), 32; https://doi.org/10.3390/proceedings2019027032 Thermographic testing is an inspection method, which primary indicates a presence of discontinuities in a tested sample. Its application to coatings can indicate a presence of local thickness variations; however, it mostly does not bring a quantitative information about a t...
Conference Paper
Muzika, L., Švantner, M., Moskal, D., Time transformation method for pulse thermography (2019) METAL 2019 - 28th International Conference on Metallurgy and Materials, Conference Proceedings, pp. 892-896. https://www.scopus.com/inward/record.uri?eid=2-s2.0-85079418668&partnerID=40&md5=cb39b3b93bd0621b59175b6940853155
Conference Paper
Tesař, J., Švantner, M., Skála, J., Honnerová, P., Novák, M., Thermographic method for fatigue limit determination at cyclic loading - Measurement procedure overview and validation (2019) METAL 2019 - 28th International Conference on Metallurgy and Materials, Conference Proceedings, pp. 526-531. https://www.scopus.com/inward/record.uri?eid=2-s2.0-...
Conference Paper
Švantner, M., Študent, J., Veselý, Z., Zonal model for an effective simulation of heat transfer processes in walking beam steel reheating furnaces (2019) METAL 2019 - 28th International Conference on Metallurgy and Materials, Conference Proceedings, pp. 107-110. https://www.scopus.com/inward/record.uri?eid=2-s2.0-85079391613&partnerID=40&md5=ac042...
Article
Inspection of solar cells is an important part of their production process because even small defects can cause a significant drop of a whole photovoltaic module performance. LED illuminated lock-in (LEDILIT) and flash-pulse thermographic techniques (FPT) were compared in this study. Lock-in methods are more commonly used for solar cell inspection....
Article
Active thermography is an infrared-based technique for nondestructive testing of materials. It often uses advanced evaluation techniques based on temperature spatial and temporal changes. Results of active thermography are contrast differences, which indicate possible defects in an inspected material. These differences cannot be quantified by tempe...
Conference Paper
Infrared nondestructive testing (IRNDT) is an active thermography method for inspection of material-surface inhomogeneities or discontinuities. It is based on an excitation of an inspected sample and a detection of its thermal response by thermographic methods. The IRNDT is commonly used for an inspection of delaminations. However, it is also appli...
Conference Paper
Testing of material fatigue properties belongs to important material examinations. A standard fatigue testing is mostly a time-consuming and expensive experiment, among others due to a number of samples needed. Infrared thermography is a method for a noncontact temperature measurement. Thermographic methods can detect small temperature changes caus...
Conference Paper
Infrared nondestructive testing is an inspection method based on an external excitation of a measured sample and a thermographic analysis of its thermal response. It often uses advanced evaluation techniques based on temperature spatial and temporal changes. IRNDT is a suitable method for an inspection of thin samples, near-surface layers and crack...
Article
Active thermography is an infrared based technique for material non-destructive testing. It often uses advanced evaluation techniques based on temperature spatial and temporal changes. Results of the active thermography are contrast differences, which indicate possible defects in an inspected material. These differences cannot be quantified by te...
Conference Paper
When inspecting objects using a thermographic camera, the inspected object often does not fit into a single frame. It can be due to the object size, limited space, the object is moving, or a high resolution image is required. For a thermographic evaluation and presentation of results, it is, however, preferable to work with a single image of the wh...
Conference Paper
The contribution is focused on thermographic inspection at material cyclic loading. The procedure of critical locations identification based on thermographic results processing by Fourier transformation is introduced in the contribution.
Conference Paper
Active thermography is a method for infrared non-destructive testing of materials. This method is based on an external excitation of a measured sample and a thermographic analysis of its thermal response. The method has a lot of configurations and is usable for a wide range of applications and materials. However, it is especially suited for thin sa...
Conference Paper
Solar cells are able to transform solar energy to electric energy. Their production and operation can cause defects that reduce their efficiency. Cells are usually very thin and brittle that complicates a manipulation with them and, therefore, a non-contact and fast method of inspection for defects in their structure is very useful. Basic solar cel...
Conference Paper
Infrared non-destructive testing (thermographic testing) can be used for inspection of material surface. This method is suitable for material inspection near its surface, therefore, it can be used for near surface layers inspection of bulk materials as well as for inspection of thin or thick coatings. In this contribution, the thermographic testing...
Conference Paper
Active thermography and its approaches are introduced in this contribution. Possibilities of active thermography are demonstrated on two examples – inspection of steel walls and inspection of components at cyclic loading. Example of an inspection of a corrosion loss at rear side of steel walls by halogen lock-in and step/transient thermography is p...
Conference Paper
Active thermography is an infrared based technique for material non-destructive testing. It often uses advanced evaluation techniques based on temperature spatial and temporal changes. Results of the active thermography are contrast differences, which indicate possible defects in an inspected material. These differences cannot be quantified by...
Article
Full-text available
This study introduces a novel large-area embroidered temperature sensor based on an innovative hybrid resistive thread. The hybrid thread is composed of strands containing polyester fibers and one resistive stainless steel microwire. The sensor itself is embroidered as a helical meander-shaped structure into the carrier fabric and is intended mainl...
Article
This article presents a new digital method, called Stamp method, for elimination of undesired noise data from a periodic IR signal. The Stamp method is a useful tool for statistical analysis of changes which appear in a noised input signal. One stamp is a statistical image of several consequence periods from a raw input signal. The Stamp method is...
Conference Paper
Full-text available
Příspěvek se zabývá možnostmi využití infračervené termografie pro kontrolu, dia-gnostiku a řízení procesu v technologiích laserového svařování. V příspěvku je představen proces laserového svařování a metody inspekce pomocí infračervené termografie. Mož-nosti využití infračervené termografie jsou demonstrovány na příkladech termovizní kontro-ly při...
Article
Infrared non-destructive testing method (IRNDT) is suitable supplement to classic non-destructive testing methods (NDT). The advantage of IRNDT method is fast and non-contact measurement and evaluation that is available to various industrial and research applications. The method is suitable for both production process inspection (material inhomo...
Article
Laser marking is an advanced technology of surface optical properties modification. A laser beam interaction with the treated surface causes a change of its optical properties and it can also affect corrosion resistance in the case of a stainless steel. The fundamental parameters of the marking process and their influence on the stainless steel c...
Article
Abstract A new single-side flash method for thermal diffusivity determination is presented. The method is based on a laser-flash pulse excitation and infrared thermography non-contact temperature measurement of a thermal response of a studied object. Using this method, the both excitation and measurement at one side (front side) of the studied obje...
Article
Laser marking is an advanced technique used for modification of surface optical properties. This paper presents research on the influence of laser marking on the corrosion properties of stainless steel. Processes during the laser beam–surface interaction cause structure and color changes and can also be responsible for reduction of corrosion resist...
Article
Industrial lasers are an expanding technology of welding and other materials processing. Lasers with optical scanning heads are often used, as these provide more versatility, accuracy, and speed. The output part of the scanning head is covered by a protective glass, which might get contaminated by various particles from the laser processing. This d...
Conference Paper
Švantner M., Kučera M., Possibilities of IRNDT inspection of laser marked stainless steel surfaces, Proc. of 13th Quantitative Infrared Thermography conference, QIRT 2016, July 4-8 2016, Gdansk, Poland, pp.261-262, 2016 Laser marking is an advanced technology of surface optical properties modification. A laser beam interaction with the treated su...
Conference Paper
Full-text available
Veselý Z., Švantner M.,Application of IRNDT method for materials in wide range of thermal diffusivity, Proc. of 13th Quantitative Infrared Thermography conference, QIRT 2016, July 4-8 2016, Gdansk, Poland, pp.267-268, 2016 Infrared non-destructive testing method (IRNDT) is suitable supplement to classic non-destructive testing methods (NDT). The...
Patent
Utility model (PUV): Thermographic camera for quantitative temperature fields measurement (CZ:Termovizní kamera pro kvantitativní měření teplotních polí). Utility model (PUV) - national; app. no. PUV 2016-32519; reg. date 29.06.2016; Owner: Západočeská univerzita, Plzeň, CZ; Authors: Milan Honner, Michal Švantner (utility model - rejected)
Article
http://dx.doi.org/10.1016/j.infrared.2015.12.001 Radiation heat transfer is one of the most important heat transfer modes in high-temperature applications. It is a strongly non-linear process, which depends on the temperature and emissivity of heat exchange surfaces, their geometrical configuration and properties of the surrounding atmosphere. Hea...
Conference Paper
Infrared nondestructive testing (IRNDT) is an advanced experimental method for defects inspection, which is based on active thermography. IRNDT uses an external excitation of a tested material and a thermographic analysis for an analysis of its response. It allows to obtain information about the tested material surface and sub-surface defects or st...
Conference Paper
Infrared nondestructive testing (IRNDT) is an advanced experimental method for defects inspection, which is based on active thermography. IRNDT uses an external excitation of a tested material and a thermographic analysis for an analysis of its response. It allows to obtain information about the tested material surface and sub-surface defects or st...
Patent
Utility model with patent application: Washable high-emissivity color for non-contact measurement of object temperature by detection of infrared radiation and usage procedure of the color (CZ: Smývatelná emisivní barva pro bezkontaktní měření teplot objektů detekcí infračerveného záření a postup použití této barvy). Utility model with patent applic...
Conference Paper
Active thermography is an advanced experimental procedure, which uses a non-contact measurement of tested materials thermal response after their external excitation. The material can be excited by a direct heating or using thermo-physical effects. Information regarding surface inhomogeneities, defects or material properties can be obtained by an ev...
Conference Paper
Fatigue properties are among the very important material parameters, whose testing is expensive and time consuming. Thermographic inspection of the cyclically loaded samples could possibly be a method, how to reduce the expenses of fatigue tests. Principles of cyclic loading thermographic inspection and methods of evaluation are presented in this c...
Article
The paper deals with a hole drilling residual stress measurement method. The basic principles of measurement and evaluation by the uniform stress and Integral methods are described. The uncertainties of the residual stress evaluation procedure based on the ASTM E837 Standard are analyzed. Examples of residual stress evaluation and comparison of dif...
Conference Paper
Cite: Švantner M., Kučera M., Smazalová E., Houdková Š., Čerstvý R.: Evaluation of laser marking influence on stainless steel corrosion properties, Proc. of the 28th Int. Conf. on Surf. Modif. Technol, SMT28, June 16-18, Tampere, Valardocs, pp.255-265, 2014 Laser marking is an advanced application of surface optical properties modification. Proces...
Conference Paper
The paper deals in hole drilling residual stress measurement method. The basic principles of measurement and evaluation by the uniform stress and Integral methods are described. The uncertainties of the residual stress evaluation procedure based on the ASTM E837 standard are analyzed. Examples of residual stress evaluation and comparison of differe...
Conference Paper
The laser scanning method uses a small laser spot in combination with a laser scanning head. The method is based on a very fast laser beam sweeping executed by the scanning head perpendicularly to the main laser treatment trajectory. The fast sweeping beam acts like a continuous wide laser spot. The method can be advantageously used on parts, which...
Conference Paper
In many research articles dealing with tribological characteristics of sliding couples measured by Block-on-Ring test, the discontinuous course of the test appears in order to evaluate cumulative mass loss during the test. According to the ASTM G-77-05, the wear rate is supposed to be determine after the end of the test without interrupting, by eva...
Conference Paper
Active thermography is an advanced experimental procedure, which uses a thermography measurement of a tested material thermal response after its external excitation. This principle can be used also for non-contact infra-red non-destructive testing (IRNDT) of materials. The IRNDT method is based on an excitation of a tested material by an external s...
Article
Continuous furnaces are commonly used for steel billet reheating before a rolling operation. It is neces- sary to perform a number of measurements to set-up and operate the optimization system of the fur- naces correctly. A charge temperature measurement using infrared detectors can be one of the usable measurement techniques. This non-contact meas...
Conference Paper
Laser hardening is one of the most common laser applications. The standard "wide-spot" method uses a direct diode laser with a large spot which moves evenly along a treated area. The scanning method uses a small laser spot in combination with a laser scanning head, which allows very fast laser spot displacements. This technique is based on very fas...
Patent
Device for making surfaces of high roughness and specific mechanical properties (CZ: Zařízení pro vytváření povrchů o vysoké drsnosti a specifických mechanických vlastnostech); Utility model - national; app. no. 2013-27458; reg. no. 25604; reg. date 15.02.2013; Owner: Západočeská univerzita, Plzeň, CZ; Authors: Michal Švantner, Milan Honner, Matěj...
Patent
Patent: A method and a device for producing surfaces of high roughness and specific mechanical properties (CZ: Způsob a zařízení pro vytváření povrchů o vysoké drsnosti a specifických mechanických vlastnostech); Patent - national; app. no. 2013-108, doc. no. 307120; reg. date 15.02.2013; Owner: Západočeská univerzita, Plzeň, CZ; Authors: Michal Šva...
Patent
Utility model (PUV): Zařízení pro mezioperační testování solárních panelů (Device for interoperation testing of solar panels), type of PUV: national, Number of application: 2011-24850, Registration number: 23264, Date of registration: 16.01.2012, Owner: University of West Bohemia, Originators: Michal Švantner, Petr Kras.
Article
The paper deals with heat flux measurement possibilities in fire safety applications. The paper presents two methods for radiation heat flux measurement – the thermography source-target measurement method, and the radiation contact target measurement method. Both the methods were used simultaneously for radiation heat flux measurement during a fire...
Conference Paper
Laser techniques are one of the technologies that can be used for modification of material surface optical properties. Decorative or identification marking of products is one of possible applications. Basic characteristics of laser technology utilization for stainless steel marking are presented in this contribution. Possibilities and limitations o...
Conference Paper
Detailed analysis of the entire reheating process obeying energy balance is presented. A complex mathematical model involving radiative heat transfer, conduction and simple combustion is systematically used to design an optimization control algorithm with respect to real technological and process constraints, which are handled in straight manner. A...
Patent
Device for thermal and mechanical protection of detectors for contactless temperature measurements (CZ: Zařízení pro tepelnou a mechanickou ochranu detektorů pro bezkontaktní měření teplot); Utility model - national; app. no. 2011-25219; reg. no. 24244; reg. date 25.11.2011; Owner: Západočeská univerzita, Plzeň, CZ; Authors: Michal Švantner http:/...
Patent
Device for in-process testing of solar panels (CZ: Zařízení pro mezioperační testování solárních panelů); Utility model - national; app. no. 2011-24850; reg. no. 23264; reg. date 16.09.2011; Owner: Západočeská univerzita, Plzeň, CZ; Authors: Michal Švantner, Petr Kras http://isdv.upv.cz/portal/pls/portal/portlets.pts.det?xprim=1715901&lan=cs&s_maj...
Conference Paper
Full-text available
Laser ablation is the method for material removing from a surface using pulsed lasers. It is used for surface structuring, laser drilling or laser marking. A change of the corrosion behavior of a base material caused by thermal effects during laser processing is an important problem of this technology. Possibilities of surface modification of stain...
Conference Paper
Thermoelastic instabilities occur in frictional systems, for example in braking systems. They manifest themselves as a local intensive temperature increase, so called hot-spots, and it is accompanied by other unwanted processes, for example by vibrations or intensive wear of friction components. This contribution deals with analysis of thermal stre...
Article
This paper deals with processes of thermoelastic instability occurring on brake systems that become evident as a non-uniform distribution of temperature with hot spots on contact surfaces. Thermoelastic instability is accompanied by the exponential rising of temperature amplitudes of hot spots during its initial linear phase. The authors discuss di...
Conference Paper
A hole-drilling residual stress measurement method is one of the most frequently used methods. Theoretically, this method is usable for different materials independently of their thermal and electrical conductivity, magnetic properties, crystalline structure etc. However, the measured material should be drilled out without producing any additional...
Article
Thermal box-barriers (TBB) are used for the thermal protection of measuring systems during exposure in a high temperature environment of various furnaces. This paper deals with problems of TBB design. TBB characteristics and limitations are discussed. The four-layer TBB structure is proposed for the high temperature application. The computer simula...
Article
Full-text available
The thermal conductivity of electrolytic iron has been measured in the temperature range from 100 to 390K. Electrolytic iron is a standard material for the measurement of thermal conductivity. The thermal conductivity was measured on a commercial device Thermal Transport Option (TTO) of a Physical Properties Measurement System (PPMS) produced by th...
Article
The hole drilling residual stress measuring method is based on drilling a small hole in a material sample and measuring the strain relieved in the hole vicinity by a special strain gauge rosette. The temperature and thermal strain induced by the drilling process can cause significant errors in the relieved strain measurement. The paper deals with c...
Article
The hole drilling technique is one of the most frequently used methods of residual stress determination. This technique is based on drilling a small hole in the material. Relieved strain around the hole is measured and the residual stress is then evaluated using calibration coefficients. Possibilities of calibration coefficient computation using fi...
Article
A computer simulation model of billet heating process in continuous pusher-type furnace is presented. The Exodus stochastic simulation method is used to solve the heat conduction partial differential equation. This paper deals with the application of the Exodus method in the furnace optimal heating-control system. A comparison of the computed resul...
Article
The paper deals with methods and results of thermography analyses of the hole-drilling residual stress measuring technique. Surface IR properties of the drilling mill and sample with strain gauge rosette of millimeter dimensions are determined by the emissivity and reflectivity measurements. Dynamic surface temperature field measurement is accompan...
Article
The paper deals with the measurement in continuous industrial furnaces. Measuring technique and measuring device are presented. Temperature evolutions are measured on the experimental billet and records of the furnace heating-control system are shown. Furnace distributions of temperature, heat flux, and heat transfer coefficient are determined by m...