Measurement of polymers with 3D optical scanners: evaluation of the subsurface scattering effect through five miniature step gauges

Paper

M G Guerra, Søren K. S. Gregersen, Jeppe Revall Frisvad, Leonardo De Chiffre, F Lavecchia, L M Galantucci

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this work, the interaction between 3D optical scanners and objects realized with different materials and colours was investigated. The interaction is mainly related to the translucency of some materials, such as polymers, which is a category of materials in ever-increasing demand by industry. At the same time, the increase of the geometrical complexity of manufactured parts raises the need for the use of 3D optical scanners thanks to their rapidity and effectiveness. Translucency causes a subsurface scattering effect that has been modelled for certain cases and affects the dimensional accuracy of measurements, as well as the quality of reconstruction. Recently, an investigation considered its effect in dimensional verification using a structured light scanner with fringe projection. In this work, the investigation is extended to other 3D optical scanners exploiting different measuring principles: laser, structured light based on phase shifting and gray code, and photogrammetry. This was done in order to study how the subsurface scattering effect can vary with the materials, colours, and also the measuring principle used. To this end, five miniature step gauges made of different polymers and colours were used, and the effects due to their different optical properties investigated. The analysis focused on dimensional verification of bidirectional lengths, first calibrated with a traceable coordinate measuring machine. The quality of the reconstruction was also evaluated through the flatness values. According to the results obtained, translucency of materials has a dual and significant effect: a measurement bias and an increase of the uncertainty due to the different quality of reconstruction retrieved. Thus, it has to be considered properly for each case.
Original languageEnglish
Article number015010
JournalMeasurement Science and Technology
Volume31
Issue number1
Number of pages15
ISSN0957-0233
DOIs
Publication statusPublished - 2020

Keywords

  • Polymers
  • Miniature step gauges
  • Subsurface scattering
  • Translucency
  • Bidirectional lengths
  • 3D optical scanner

Cite this

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title = "Measurement of polymers with 3D optical scanners: evaluation of the subsurface scattering effect through five miniature step gauges: Paper",
abstract = "In this work, the interaction between 3D optical scanners and objects realized with different materials and colours was investigated. The interaction is mainly related to the translucency of some materials, such as polymers, which is a category of materials in ever-increasing demand by industry. At the same time, the increase of the geometrical complexity of manufactured parts raises the need for the use of 3D optical scanners thanks to their rapidity and effectiveness. Translucency causes a subsurface scattering effect that has been modelled for certain cases and affects the dimensional accuracy of measurements, as well as the quality of reconstruction. Recently, an investigation considered its effect in dimensional verification using a structured light scanner with fringe projection. In this work, the investigation is extended to other 3D optical scanners exploiting different measuring principles: laser, structured light based on phase shifting and gray code, and photogrammetry. This was done in order to study how the subsurface scattering effect can vary with the materials, colours, and also the measuring principle used. To this end, five miniature step gauges made of different polymers and colours were used, and the effects due to their different optical properties investigated. The analysis focused on dimensional verification of bidirectional lengths, first calibrated with a traceable coordinate measuring machine. The quality of the reconstruction was also evaluated through the flatness values. According to the results obtained, translucency of materials has a dual and significant effect: a measurement bias and an increase of the uncertainty due to the different quality of reconstruction retrieved. Thus, it has to be considered properly for each case.",
keywords = "Polymers, Miniature step gauges, Subsurface scattering, Translucency, Bidirectional lengths, 3D optical scanner",
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year = "2020",
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language = "English",
volume = "31",
journal = "Measurement Science and Technology",
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Measurement of polymers with 3D optical scanners: evaluation of the subsurface scattering effect through five miniature step gauges : Paper. / Guerra, M G; Gregersen, Søren K. S.; Frisvad, Jeppe Revall; De Chiffre, Leonardo; Lavecchia, F; Galantucci, L M.

In: Measurement Science and Technology, Vol. 31, No. 1, 015010, 2020.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Measurement of polymers with 3D optical scanners: evaluation of the subsurface scattering effect through five miniature step gauges

T2 - Paper

AU - Guerra, M G

AU - Gregersen, Søren K. S.

AU - Frisvad, Jeppe Revall

AU - De Chiffre, Leonardo

AU - Lavecchia, F

AU - Galantucci, L M

PY - 2020

Y1 - 2020

N2 - In this work, the interaction between 3D optical scanners and objects realized with different materials and colours was investigated. The interaction is mainly related to the translucency of some materials, such as polymers, which is a category of materials in ever-increasing demand by industry. At the same time, the increase of the geometrical complexity of manufactured parts raises the need for the use of 3D optical scanners thanks to their rapidity and effectiveness. Translucency causes a subsurface scattering effect that has been modelled for certain cases and affects the dimensional accuracy of measurements, as well as the quality of reconstruction. Recently, an investigation considered its effect in dimensional verification using a structured light scanner with fringe projection. In this work, the investigation is extended to other 3D optical scanners exploiting different measuring principles: laser, structured light based on phase shifting and gray code, and photogrammetry. This was done in order to study how the subsurface scattering effect can vary with the materials, colours, and also the measuring principle used. To this end, five miniature step gauges made of different polymers and colours were used, and the effects due to their different optical properties investigated. The analysis focused on dimensional verification of bidirectional lengths, first calibrated with a traceable coordinate measuring machine. The quality of the reconstruction was also evaluated through the flatness values. According to the results obtained, translucency of materials has a dual and significant effect: a measurement bias and an increase of the uncertainty due to the different quality of reconstruction retrieved. Thus, it has to be considered properly for each case.

AB - In this work, the interaction between 3D optical scanners and objects realized with different materials and colours was investigated. The interaction is mainly related to the translucency of some materials, such as polymers, which is a category of materials in ever-increasing demand by industry. At the same time, the increase of the geometrical complexity of manufactured parts raises the need for the use of 3D optical scanners thanks to their rapidity and effectiveness. Translucency causes a subsurface scattering effect that has been modelled for certain cases and affects the dimensional accuracy of measurements, as well as the quality of reconstruction. Recently, an investigation considered its effect in dimensional verification using a structured light scanner with fringe projection. In this work, the investigation is extended to other 3D optical scanners exploiting different measuring principles: laser, structured light based on phase shifting and gray code, and photogrammetry. This was done in order to study how the subsurface scattering effect can vary with the materials, colours, and also the measuring principle used. To this end, five miniature step gauges made of different polymers and colours were used, and the effects due to their different optical properties investigated. The analysis focused on dimensional verification of bidirectional lengths, first calibrated with a traceable coordinate measuring machine. The quality of the reconstruction was also evaluated through the flatness values. According to the results obtained, translucency of materials has a dual and significant effect: a measurement bias and an increase of the uncertainty due to the different quality of reconstruction retrieved. Thus, it has to be considered properly for each case.

KW - Polymers

KW - Miniature step gauges

KW - Subsurface scattering

KW - Translucency

KW - Bidirectional lengths

KW - 3D optical scanner

U2 - 10.1088/1361-6501/ab3edb

DO - 10.1088/1361-6501/ab3edb

M3 - Journal article

VL - 31

JO - Measurement Science and Technology

JF - Measurement Science and Technology

SN - 0957-0233

IS - 1

M1 - 015010

ER -