Nonminimum Phase Behavior of Laser Material Processing (cd-rom)

Gerardus Richardus, Bernardus, Engelina Römer, N.P. Weerkamp, J. Meijer, S. Postma, S. Postma

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

Optical sensors are increasingly applied in laser material processing to monitor and control the lasermaterial interaction zone. Dynamic models, relating the sensor signals (e.g. as temperature or molten area) to the process inputs (e.g. laser power or beam velocity), provide the basis for the design and tuning of a feedback controller. These models can show nonminimum phase (NMP) behavior. This means that the sensor signal of a minimum phase process directly changes in the direction of its steady-state value, whereas the sensor signal of the NMP process is initially in the opposite direction. This paper illustrates and discusses the NMP behavior found in three different laser processes. Firstly, the behavior is shown theoretically for laser heating, using a Finite Element Model (FEM). Here the beam velocity is used as an input and the temperature (as well as molten area) is the model output. Secondly, the NMP behavior is shown experimentally for laser alloying of titanium. In this case again the beam velocity is applied as input, whereas a pyrometer signal is considered as output. Finally, laser welding of mild steel is discussed. Here the laser power is considered as input, and the intensity of the plasma radiation as output. Whether or not a process shows NMP behavior is essential information in the design and tuning of model based feedback controllers
Original languageUndefined
Title of host publicationProceedings of the ICALEO'01
Place of PublicationJacksonville, Florida, USA
Pages10-
Number of pages1
Publication statusPublished - 15 Oct 2001
Event20th International Congress on Applications of Lasers & Electro-Optics, ICALEO 2001 - Jacksonville, United States
Duration: 15 Oct 200118 Oct 2001
Conference number: 20

Conference

Conference20th International Congress on Applications of Lasers & Electro-Optics, ICALEO 2001
Abbreviated titleICALEO
CountryUnited States
CityJacksonville
Period15/10/0118/10/01

Keywords

  • IR-79829
  • METIS-202996

Cite this

Römer, G. R. B. E., Weerkamp, N. P., Meijer, J., Postma, S., & Postma, S. (2001). Nonminimum Phase Behavior of Laser Material Processing (cd-rom). In Proceedings of the ICALEO'01 (pp. 10-). Jacksonville, Florida, USA.
Römer, Gerardus Richardus, Bernardus, Engelina ; Weerkamp, N.P. ; Meijer, J. ; Postma, S. ; Postma, S. / Nonminimum Phase Behavior of Laser Material Processing (cd-rom). Proceedings of the ICALEO'01. Jacksonville, Florida, USA, 2001. pp. 10-
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Römer, GRBE, Weerkamp, NP, Meijer, J, Postma, S & Postma, S 2001, Nonminimum Phase Behavior of Laser Material Processing (cd-rom). in Proceedings of the ICALEO'01. Jacksonville, Florida, USA, pp. 10-, 20th International Congress on Applications of Lasers & Electro-Optics, ICALEO 2001, Jacksonville, United States, 15/10/01.

Nonminimum Phase Behavior of Laser Material Processing (cd-rom). / Römer, Gerardus Richardus, Bernardus, Engelina; Weerkamp, N.P.; Meijer, J.; Postma, S.; Postma, S.

Proceedings of the ICALEO'01. Jacksonville, Florida, USA, 2001. p. 10-.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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T1 - Nonminimum Phase Behavior of Laser Material Processing (cd-rom)

AU - Römer, Gerardus Richardus, Bernardus, Engelina

AU - Weerkamp, N.P.

AU - Meijer, J.

AU - Postma, S.

AU - Postma, S.

PY - 2001/10/15

Y1 - 2001/10/15

N2 - Optical sensors are increasingly applied in laser material processing to monitor and control the lasermaterial interaction zone. Dynamic models, relating the sensor signals (e.g. as temperature or molten area) to the process inputs (e.g. laser power or beam velocity), provide the basis for the design and tuning of a feedback controller. These models can show nonminimum phase (NMP) behavior. This means that the sensor signal of a minimum phase process directly changes in the direction of its steady-state value, whereas the sensor signal of the NMP process is initially in the opposite direction. This paper illustrates and discusses the NMP behavior found in three different laser processes. Firstly, the behavior is shown theoretically for laser heating, using a Finite Element Model (FEM). Here the beam velocity is used as an input and the temperature (as well as molten area) is the model output. Secondly, the NMP behavior is shown experimentally for laser alloying of titanium. In this case again the beam velocity is applied as input, whereas a pyrometer signal is considered as output. Finally, laser welding of mild steel is discussed. Here the laser power is considered as input, and the intensity of the plasma radiation as output. Whether or not a process shows NMP behavior is essential information in the design and tuning of model based feedback controllers

AB - Optical sensors are increasingly applied in laser material processing to monitor and control the lasermaterial interaction zone. Dynamic models, relating the sensor signals (e.g. as temperature or molten area) to the process inputs (e.g. laser power or beam velocity), provide the basis for the design and tuning of a feedback controller. These models can show nonminimum phase (NMP) behavior. This means that the sensor signal of a minimum phase process directly changes in the direction of its steady-state value, whereas the sensor signal of the NMP process is initially in the opposite direction. This paper illustrates and discusses the NMP behavior found in three different laser processes. Firstly, the behavior is shown theoretically for laser heating, using a Finite Element Model (FEM). Here the beam velocity is used as an input and the temperature (as well as molten area) is the model output. Secondly, the NMP behavior is shown experimentally for laser alloying of titanium. In this case again the beam velocity is applied as input, whereas a pyrometer signal is considered as output. Finally, laser welding of mild steel is discussed. Here the laser power is considered as input, and the intensity of the plasma radiation as output. Whether or not a process shows NMP behavior is essential information in the design and tuning of model based feedback controllers

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BT - Proceedings of the ICALEO'01

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Römer GRBE, Weerkamp NP, Meijer J, Postma S, Postma S. Nonminimum Phase Behavior of Laser Material Processing (cd-rom). In Proceedings of the ICALEO'01. Jacksonville, Florida, USA. 2001. p. 10-