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Sarady, Istvan
Publications (10 of 31) Show all publications
Yalukova, O. & Sarady, I. (2006). Investigation of interaction mechanisms in laser drilling of thermoplastic and thermoset polymers using different wavelengths (ed.). Composites Science And Technology, 66(10), 1289-1296
Open this publication in new window or tab >>Investigation of interaction mechanisms in laser drilling of thermoplastic and thermoset polymers using different wavelengths
2006 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 66, no 10, p. 1289-1296Article in journal (Refereed) Published
Abstract [en]

In this paper a comparison of the percussion drilled holes in fiber reinforced polymer and non-reinforced thermoplastic sheets using three wavelengths, 1064, 532 and 266 nm is presented. At near infrared and visible wavelengths, 1064 and 532 nm, most of the bulk thermoplastic and thermoset polymers are partially transparent. The degree of transparency is dependent upon the degree of crystallinity. The most amorphous thermoplastics, such as PMMA have the highest transparency. In comparison, the fibre reinforced thermosets - graphite fibre reinforced epoxy - have low transparency. If the IR or visible laser beam is strongly focused, it can cause thermally induced degradation and sometimes burning and other damages (cracking, boiling, etc.) around the focused laser spot and the interaction zone. By using the fourth harmonics ultraviolet light (266 nm) of a diode-pumped and AOQ-switched Nd:YAG-laser with pulse duration of about 100 ns, the hole drilling process was significantly improved and the risk for thermal damage has been significantly reduced for both materials. Around the irradiated spot or drilled holes the material is influenced. This was investigated by both scanning electron microscopy and optical microscopy. There was clear evidence of a change in the interaction mechanism if UV light with high enough photon energy was used. By using UV light, bond breaking rather than thermal material removal occurred, i.e., a change from thermal to photo-chemical dissociation or photo-ablation becomes the dominant interaction mechanism.

National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-5290 (URN)10.1016/j.compscitech.2005.11.002 (DOI)000238496800011 ()2-s2.0-33646556421 (Scopus ID)35a1cd80-f6ed-11db-ac79-000ea68e967b (Local ID)35a1cd80-f6ed-11db-ac79-000ea68e967b (Archive number)35a1cd80-f6ed-11db-ac79-000ea68e967b (OAI)
Note

Validerad; 2006; 20070430 (cira)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Sjödahl, M., Gren, P., Sarady, I. & Miroshnicova, N. (2006). Laser hole drilling process studied using laser speckle correlation (ed.). In: (Ed.), Pierre Slangen; Christine Cerruti (Ed.), Speckle06: speckles, from grains to flowers ; 13 - 15 September 2006, Nimes, France ; [proceedings]. Paper presented at Speckle 06 : 13/09/2006 - 15/09/2006 (pp. 63412M). Bellingham, Wash.: SPIE - International Society for Optical Engineering
Open this publication in new window or tab >>Laser hole drilling process studied using laser speckle correlation
2006 (English)In: Speckle06: speckles, from grains to flowers ; 13 - 15 September 2006, Nimes, France ; [proceedings] / [ed] Pierre Slangen; Christine Cerruti, Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2006, p. 63412M-Conference paper, Published paper (Refereed)
Abstract [en]

This paper revisits defocused speckle correlation as a tool for measuring the response in metal sheets during percussion laser drilling processing. For the processing the 4th harmonic Nd:YAG wavelength (266 nm) was used in pulsed mode. It is shown that the method provides a cost efficient and robust alternative to speckle interferometry for the study of the small deformations that appear during laser processing. The accuracy was shown to be in the order of a few tens of μrads for the tilt component being measured which translates to a few nm in deflection when being spatially integrated. In the measurements deflections up to 50 nm was detected on the backside of silver and a copper sheet, respectively.

Place, publisher, year, edition, pages
Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2006
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 6341
National Category
Applied Mechanics Manufacturing, Surface and Joining Technology
Research subject
Experimental Mechanics; Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-34895 (URN)10.1117/12.695845 (DOI)000241191500094 ()2-s2.0-33749841251 (Scopus ID)93396380-e785-11db-8a98-000ea68e967b (Local ID)9780819464262 (ISBN)93396380-e785-11db-8a98-000ea68e967b (Archive number)93396380-e785-11db-8a98-000ea68e967b (OAI)
Conference
Speckle 06 : 13/09/2006 - 15/09/2006
Note
Validerad; 2006; 20070410 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved
Sarady, I., Miroshnikova, N., Yalukova, O. & Kaplan, A. (2005). Drilling of different materials with pulsed lasers at short wavelengths (ed.). In: (Ed.), Alexander Kaplan (Ed.), 10th NOLAMP Conference: the 10th Nordic Laser Materials Processing Conference, 17-19 August 2005, Luleå Sweden. Paper presented at Nordic Laser Materials Processing Conference : 17/08/2005 - 19/08/2005 (pp. 245-256). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Drilling of different materials with pulsed lasers at short wavelengths
2005 (English)In: 10th NOLAMP Conference: the 10th Nordic Laser Materials Processing Conference, 17-19 August 2005, Luleå Sweden / [ed] Alexander Kaplan, Luleå: Luleå tekniska universitet, 2005, p. 245-256Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2005
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-40317 (URN)f667a7b0-dcf8-11db-9cae-000ea68e967b (Local ID)91-631-7228-3 (ISBN)f667a7b0-dcf8-11db-9cae-000ea68e967b (Archive number)f667a7b0-dcf8-11db-9cae-000ea68e967b (OAI)
Conference
Nordic Laser Materials Processing Conference : 17/08/2005 - 19/08/2005
Note
Godkänd; 2005; 20070328 (cira)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Sarady, I., Yalukova, O., Sjödahl, M. & Kaplan, A. (2005). Drilling of polymeric materials with pulsed lasers at short wavelengths (ed.). In: (Ed.), Alexander Kaplan (Ed.), 10th NOLAMP Conference: the 10th Nordic Laser Materials Processing Conference, 17-19 August 2005, Luleå Sweden. Paper presented at Nordic Laser Materials Processing Conference : 17/08/2005 - 19/08/2005 (pp. 245-255). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Drilling of polymeric materials with pulsed lasers at short wavelengths
2005 (English)In: 10th NOLAMP Conference: the 10th Nordic Laser Materials Processing Conference, 17-19 August 2005, Luleå Sweden / [ed] Alexander Kaplan, Luleå: Luleå tekniska universitet, 2005, p. 245-255Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2005
National Category
Manufacturing, Surface and Joining Technology Applied Mechanics
Research subject
Manufacturing Systems Engineering; Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-32441 (URN)6f027760-fa4d-11db-b2dd-000ea68e967b (Local ID)91-631-7228-3 (ISBN)6f027760-fa4d-11db-b2dd-000ea68e967b (Archive number)6f027760-fa4d-11db-b2dd-000ea68e967b (OAI)
Conference
Nordic Laser Materials Processing Conference : 17/08/2005 - 19/08/2005
Note
Godkänd; 2005; 20070504 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Yalukova, O., Miroshnikova, N., Gren, P., Sarady, I. & Sjödahl, M. (2005). Investigation of laser percussion hole drilling by use of speckle correlation (ed.). Paper presented at . Applied Optics, 44(30), 6338-44
Open this publication in new window or tab >>Investigation of laser percussion hole drilling by use of speckle correlation
Show others...
2005 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 44, no 30, p. 6338-44Article in journal (Refereed) Published
Abstract [en]

In this paper speckle correlation is introduced as a tool to investigate the heat-influenced area during material processing with laser light. Two materials were investigated, a pure silver sheet and a sheet of SiC-diamond composite. The processing laser used in the experiments was a diode-pumped acousto-optical Q-switched Nd:YAG laser that allowed percussion hole drilling to be performed using green light through a second-harmonic crystal. The measurements were performed using a continuous-wave He-Ne laser and a digital camera. The experimental results show that the heat-influenced area is ~5000 times larger than the actual hole being drilled and that it reaches a steady-state condition toward the end of the processing cycle

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-7669 (URN)10.1364/AO.44.006338 (DOI)000232674900003 ()2-s2.0-27944441759 (Scopus ID)611a6600-6f6d-11db-962b-000ea68e967b (Local ID)611a6600-6f6d-11db-962b-000ea68e967b (Archive number)611a6600-6f6d-11db-962b-000ea68e967b (OAI)
Note
Validerad; 2005; 20060925 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Miroshnikova, N., Sjödahl, M., Gren, P. & Sarady, I. (2005). Percussion hole drilling of metals with a fourth-harmonic Nd:YAG laser studied by defocused laser speckle correlation (ed.). Paper presented at . Applied Optics, 44(17), 3403-8
Open this publication in new window or tab >>Percussion hole drilling of metals with a fourth-harmonic Nd:YAG laser studied by defocused laser speckle correlation
2005 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 44, no 17, p. 3403-8Article in journal (Refereed) Published
Abstract [en]

Defocused speckle correlation is introduced as a tool for measuring the response in metal sheets during percussion laser drilling. For this procedure the fourth-harmonic Nd:YAG wavelength (266 nm) was used in pulsed mode. The method provides a cost-efficient and robust alternative to speckle interferometry for the study of the small deformations that appear during laser processing. The accuracy was shown to be of the order of a few tens of microradians for the tilt component that is measured, which translates to a few nanometers in deflection when the component is spatially integrated. In the measurements, deflections in the form of craters as large as 50 nm were detected on the back sides of silver and copper sheets. The diameters of the craters were 300 μm in the silver and 150 μm in the copper sheet; the output diameter of the hole was ~5 μm

National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-7484 (URN)10.1364/AO.44.003403 (DOI)000229720000002 ()2-s2.0-20844461531 (Scopus ID)5e1a0f90-6f73-11db-962b-000ea68e967b (Local ID)5e1a0f90-6f73-11db-962b-000ea68e967b (Archive number)5e1a0f90-6f73-11db-962b-000ea68e967b (OAI)
Note
Validerad; 2005; 20060925 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Koh, Y. S. & Sarady, I. (2005). Surface cleaning of iron artefacts by lasers (ed.). In: (Ed.), Klaus Dickmann; Costas Fotakis; John F. Asmus (Ed.), Lasers in the Conservation of Artworks: LACONA V proceedings, Osnabrück, Germany, Sept. 15-18, 2003. Paper presented at International Conference Lasers in the Conservation of Artworks : 15/09/2003 - 18/09/2003 (pp. 95-100). Berlin: Encyclopedia of Global Archaeology/Springer Verlag, Part II
Open this publication in new window or tab >>Surface cleaning of iron artefacts by lasers
2005 (English)In: Lasers in the Conservation of Artworks: LACONA V proceedings, Osnabrück, Germany, Sept. 15-18, 2003 / [ed] Klaus Dickmann; Costas Fotakis; John F. Asmus, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2005, Vol. Part II, p. 95-100Conference paper, Published paper (Refereed)
Abstract [en]

In this paper the general method and ethics of the laser cleaning technique for conservation are presented. The results of two experiments are also presented; experiment 1 compares cleaning of rust by an Nd:YAG laser and micro-blasting whilst experiment 2 deals with removing the wax coating from iron samples by a TEA CO2 laser. The first experiment showed that cleaning with a pulsed laser and higher photon energy obtained a better surface structure than micro blasting. The second experiment showed how differences in energy density affect the same surface.

Place, publisher, year, edition, pages
Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2005
Series
Springer Proceedings in Physics, ISSN 0930-8989 ; 100
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-39600 (URN)10.1007/3-540-27176-7_12 (DOI)e6cd5080-0af6-11dc-9854-000ea68e967b (Local ID)978-3-540-22996-4 (ISBN)e6cd5080-0af6-11dc-9854-000ea68e967b (Archive number)e6cd5080-0af6-11dc-9854-000ea68e967b (OAI)
Conference
International Conference Lasers in the Conservation of Artworks : 15/09/2003 - 18/09/2003
Note
Godkänd; 2005; 20070525 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Miroshnikova, N. V., Yalukova, O. M., Sjödahl, M. & Sarady, I. (2004). Study of mechanisms by which the radiation of powerful pulsed CO2 and Nd:YAG lasers acts on various materials, using the method of digital speckle photography (ed.). Paper presented at . Journal of optical technology (Print), 71, 514-519
Open this publication in new window or tab >>Study of mechanisms by which the radiation of powerful pulsed CO2 and Nd:YAG lasers acts on various materials, using the method of digital speckle photography
2004 (English)In: Journal of optical technology (Print), ISSN 1070-9762, E-ISSN 1091-0786, Vol. 71, p. 514-519Article in journal (Refereed) Published
Abstract [en]

This paper describes a method of digital speckle photography that can be used to study the mechanisms by which powerful radiation from pulsed CO2 and Nd:YAG lasers acts on various materials. Rough-surfaced plates made from aluminum oxide and steel were used as experimental samples. The results of the experiments are presented in the form of three-dimensional graphs that clearly display the characteristics and dynamics of the processes being studied.

National Category
Applied Mechanics Manufacturing, Surface and Joining Technology
Research subject
Experimental Mechanics; Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-2388 (URN)10.1364/JOT.71.000514 (DOI)000223776000005 ()00024240-b04d-11db-840a-000ea68e967b (Local ID)00024240-b04d-11db-840a-000ea68e967b (Archive number)00024240-b04d-11db-840a-000ea68e967b (OAI)
Note
Validerad; 2004; 20070130 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Miroshnikova, N., Yalukova, O., Sjödahl, M. & Sarady, I. (2004). Study of the interaction mechanism between different materials and pulses from CO2-and Nd:YAG-lasers using Digital Speckle Photography (ed.). In: (Ed.), (Ed.), Laser-assisted micro- and nanotechnologies 2003: . Paper presented at Intensive Laser Action and Technological Applications (International symposium) : 30/06/2003 - 03/07/2003. Bellingham, Wash: SPIE - International Society for Optical Engineering
Open this publication in new window or tab >>Study of the interaction mechanism between different materials and pulses from CO2-and Nd:YAG-lasers using Digital Speckle Photography
2004 (English)In: Laser-assisted micro- and nanotechnologies 2003, Bellingham, Wash: SPIE - International Society for Optical Engineering, 2004Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Bellingham, Wash: SPIE - International Society for Optical Engineering, 2004
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 5399
National Category
Applied Mechanics Manufacturing, Surface and Joining Technology
Research subject
Experimental Mechanics; Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-34757 (URN)9098a0a0-fee1-11db-b19d-000ea68e967b (Local ID)9098a0a0-fee1-11db-b19d-000ea68e967b (Archive number)9098a0a0-fee1-11db-b19d-000ea68e967b (OAI)
Conference
Intensive Laser Action and Technological Applications (International symposium) : 30/06/2003 - 03/07/2003
Note
Validerad; 2004; Bibliografisk uppgift: Also known as LAM-X. Held with the 11th International conference on laser-matter interaction (LMI-XI) and the 1st International conference on education in lasers and laser-based technologies (ELT-1) during the framework of the 3rd International symposium on intensive laser action and technological applications (ILATA-III).; 20070510 (cira)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Miroshnikova, N., Yalukova, O., Sjödahl, M. & Sarady, I. (2004). Study of the interaction mechanisms between different materials and pulses from CO2- and Nd:YAG-lasers using digital speckle photography (ed.). Paper presented at Nonresonant Laser-Matter Interaction (NLMI-11) : 29/06/2003 - 02/07/2003. Proceedings of SPIE, the International Society for Optical Engineering, 5506, 42-50
Open this publication in new window or tab >>Study of the interaction mechanisms between different materials and pulses from CO2- and Nd:YAG-lasers using digital speckle photography
2004 (English)In: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, E-ISSN 1996-756X, Vol. 5506, p. 42-50Article in journal (Refereed) Published
Abstract [en]

Pulsed irradiation from CO2- and Nd:YAG lasers focused on the front side of different plates produces nearly instantaneous surface changes on the rear side of the plate. The responses of the materials depend on physical parameters such as pulse energy and duration, photon energy, the absorption and mechanical characteristics of the target material. The equipment built up for visualization of these phenomena consists of a cw. He-Ne laser, a digital CCD camera and a fast computer. The analysis is done using Digital Speckle Photography (DSP). Using focused and defocused laser speckle patterns, DSP enables measurement of in-plane strain fields, Brownian motion and residual micro-structural changes in the material caused by a laser pulse. Results are obtained at the frame rate of the digital camera and allow the creation of animated real-time or "movie" sequences. Results from CO2- and Nd:YAG pulse interaction on Al2O3 ceramics and steel plates will be presented. The Brownian motion during the relaxation phase is more or less localized to the impacted area for both materials and both wavelengths but the relaxation times differ significantly. Steel also exhibits some residual material changes and doesn't recover completely while Al2O3 returns to its initial state some time after the impact

National Category
Applied Mechanics Manufacturing, Surface and Joining Technology
Research subject
Experimental Mechanics; Manufacturing Systems Engineering
Identifiers
urn:nbn:se:ltu:diva-31478 (URN)10.1117/12.579998 (DOI)000223391500006 ()2-s2.0-8844262630 (Scopus ID)5a89d790-adc1-11de-8293-000ea68e967b (Local ID)5a89d790-adc1-11de-8293-000ea68e967b (Archive number)5a89d790-adc1-11de-8293-000ea68e967b (OAI)
Conference
Nonresonant Laser-Matter Interaction (NLMI-11) : 29/06/2003 - 02/07/2003
Note

Validerad;2004;20090930 (ysko);Konferensartikel i tidskrift;Bibliografisk uppgift: Volumne: 5506

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2019-04-30Bibliographically approved

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