Abstract

An on-line apparatus for accurate measurement of float-glass thickness and edge distortion was built and tested in industrial environments. The intelligent part of the sensor is a diffractive optical element. The theory and construction of the apparatus are described, and data from on-line measurements are presented.

© 2001 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. J. Bretschneider, “Application of optical testing procedures to quality control of flat glass,” Glastech. Ber. 61, 172–175 (1988).
  2. V. Caimann, “Optische Prüfung gezogener Flachgläser,” Glastech. Ber. 47, 131–139 (1974).
  3. M. Savolainen, K.-E. Peiponen, P. Savander, R. Silvennoinen, H. Vehviläinen, “Novel optical techniques for window glass inspection,” Meas. Sci. Technol. 6, 1016–1021 (1995).
    [CrossRef]
  4. K.-E. Peiponen, J. T. Räsänen, “Micro-optical elements for glass quality inspection,” in Proceedings of Glass Processing Days, J. Vitkala, ed. (Tamglass Ltd, Tampere, Finland, 1999), pp. 9–11.
  5. R. Silvennoinen, K.-E. Peiponen, T. Asakura, “Diffractive optical elements in materials inspection,” in International Trends in Optics and Photonics ICO IV, T. Asakura, ed. (Springer, Heidelberg, 1999).
    [CrossRef]
  6. M. Nieto-Vesperinas, Scattering and Diffraction in Physical Optics (Wiley, New York, 1991).
  7. R. Silvennoinen, K.-E. Peiponen, J. Räty, “Detection of refractive index change of liquids by diffractive element based sensor,” Opt. Rev. 6, 68–70 (1999).
    [CrossRef]
  8. A. Jääskeläinen, R. Silvennoinen, K.-E. Peiponen, J. Räty, “On measurement of complex refractive index of liquids by diffractive element-based sensor,” Opt. Commun. 178, 53–57 (2000).
    [CrossRef]

2000 (1)

A. Jääskeläinen, R. Silvennoinen, K.-E. Peiponen, J. Räty, “On measurement of complex refractive index of liquids by diffractive element-based sensor,” Opt. Commun. 178, 53–57 (2000).
[CrossRef]

1999 (1)

R. Silvennoinen, K.-E. Peiponen, J. Räty, “Detection of refractive index change of liquids by diffractive element based sensor,” Opt. Rev. 6, 68–70 (1999).
[CrossRef]

1995 (1)

M. Savolainen, K.-E. Peiponen, P. Savander, R. Silvennoinen, H. Vehviläinen, “Novel optical techniques for window glass inspection,” Meas. Sci. Technol. 6, 1016–1021 (1995).
[CrossRef]

1988 (1)

J. Bretschneider, “Application of optical testing procedures to quality control of flat glass,” Glastech. Ber. 61, 172–175 (1988).

1974 (1)

V. Caimann, “Optische Prüfung gezogener Flachgläser,” Glastech. Ber. 47, 131–139 (1974).

Asakura, T.

R. Silvennoinen, K.-E. Peiponen, T. Asakura, “Diffractive optical elements in materials inspection,” in International Trends in Optics and Photonics ICO IV, T. Asakura, ed. (Springer, Heidelberg, 1999).
[CrossRef]

Bretschneider, J.

J. Bretschneider, “Application of optical testing procedures to quality control of flat glass,” Glastech. Ber. 61, 172–175 (1988).

Caimann, V.

V. Caimann, “Optische Prüfung gezogener Flachgläser,” Glastech. Ber. 47, 131–139 (1974).

Jääskeläinen, A.

A. Jääskeläinen, R. Silvennoinen, K.-E. Peiponen, J. Räty, “On measurement of complex refractive index of liquids by diffractive element-based sensor,” Opt. Commun. 178, 53–57 (2000).
[CrossRef]

Nieto-Vesperinas, M.

M. Nieto-Vesperinas, Scattering and Diffraction in Physical Optics (Wiley, New York, 1991).

Peiponen, K.-E.

A. Jääskeläinen, R. Silvennoinen, K.-E. Peiponen, J. Räty, “On measurement of complex refractive index of liquids by diffractive element-based sensor,” Opt. Commun. 178, 53–57 (2000).
[CrossRef]

R. Silvennoinen, K.-E. Peiponen, J. Räty, “Detection of refractive index change of liquids by diffractive element based sensor,” Opt. Rev. 6, 68–70 (1999).
[CrossRef]

M. Savolainen, K.-E. Peiponen, P. Savander, R. Silvennoinen, H. Vehviläinen, “Novel optical techniques for window glass inspection,” Meas. Sci. Technol. 6, 1016–1021 (1995).
[CrossRef]

R. Silvennoinen, K.-E. Peiponen, T. Asakura, “Diffractive optical elements in materials inspection,” in International Trends in Optics and Photonics ICO IV, T. Asakura, ed. (Springer, Heidelberg, 1999).
[CrossRef]

K.-E. Peiponen, J. T. Räsänen, “Micro-optical elements for glass quality inspection,” in Proceedings of Glass Processing Days, J. Vitkala, ed. (Tamglass Ltd, Tampere, Finland, 1999), pp. 9–11.

Räsänen, J. T.

K.-E. Peiponen, J. T. Räsänen, “Micro-optical elements for glass quality inspection,” in Proceedings of Glass Processing Days, J. Vitkala, ed. (Tamglass Ltd, Tampere, Finland, 1999), pp. 9–11.

Räty, J.

A. Jääskeläinen, R. Silvennoinen, K.-E. Peiponen, J. Räty, “On measurement of complex refractive index of liquids by diffractive element-based sensor,” Opt. Commun. 178, 53–57 (2000).
[CrossRef]

R. Silvennoinen, K.-E. Peiponen, J. Räty, “Detection of refractive index change of liquids by diffractive element based sensor,” Opt. Rev. 6, 68–70 (1999).
[CrossRef]

Savander, P.

M. Savolainen, K.-E. Peiponen, P. Savander, R. Silvennoinen, H. Vehviläinen, “Novel optical techniques for window glass inspection,” Meas. Sci. Technol. 6, 1016–1021 (1995).
[CrossRef]

Savolainen, M.

M. Savolainen, K.-E. Peiponen, P. Savander, R. Silvennoinen, H. Vehviläinen, “Novel optical techniques for window glass inspection,” Meas. Sci. Technol. 6, 1016–1021 (1995).
[CrossRef]

Silvennoinen, R.

A. Jääskeläinen, R. Silvennoinen, K.-E. Peiponen, J. Räty, “On measurement of complex refractive index of liquids by diffractive element-based sensor,” Opt. Commun. 178, 53–57 (2000).
[CrossRef]

R. Silvennoinen, K.-E. Peiponen, J. Räty, “Detection of refractive index change of liquids by diffractive element based sensor,” Opt. Rev. 6, 68–70 (1999).
[CrossRef]

M. Savolainen, K.-E. Peiponen, P. Savander, R. Silvennoinen, H. Vehviläinen, “Novel optical techniques for window glass inspection,” Meas. Sci. Technol. 6, 1016–1021 (1995).
[CrossRef]

R. Silvennoinen, K.-E. Peiponen, T. Asakura, “Diffractive optical elements in materials inspection,” in International Trends in Optics and Photonics ICO IV, T. Asakura, ed. (Springer, Heidelberg, 1999).
[CrossRef]

Vehviläinen, H.

M. Savolainen, K.-E. Peiponen, P. Savander, R. Silvennoinen, H. Vehviläinen, “Novel optical techniques for window glass inspection,” Meas. Sci. Technol. 6, 1016–1021 (1995).
[CrossRef]

Glastech. Ber. (2)

J. Bretschneider, “Application of optical testing procedures to quality control of flat glass,” Glastech. Ber. 61, 172–175 (1988).

V. Caimann, “Optische Prüfung gezogener Flachgläser,” Glastech. Ber. 47, 131–139 (1974).

Meas. Sci. Technol. (1)

M. Savolainen, K.-E. Peiponen, P. Savander, R. Silvennoinen, H. Vehviläinen, “Novel optical techniques for window glass inspection,” Meas. Sci. Technol. 6, 1016–1021 (1995).
[CrossRef]

Opt. Commun. (1)

A. Jääskeläinen, R. Silvennoinen, K.-E. Peiponen, J. Räty, “On measurement of complex refractive index of liquids by diffractive element-based sensor,” Opt. Commun. 178, 53–57 (2000).
[CrossRef]

Opt. Rev. (1)

R. Silvennoinen, K.-E. Peiponen, J. Räty, “Detection of refractive index change of liquids by diffractive element based sensor,” Opt. Rev. 6, 68–70 (1999).
[CrossRef]

Other (3)

K.-E. Peiponen, J. T. Räsänen, “Micro-optical elements for glass quality inspection,” in Proceedings of Glass Processing Days, J. Vitkala, ed. (Tamglass Ltd, Tampere, Finland, 1999), pp. 9–11.

R. Silvennoinen, K.-E. Peiponen, T. Asakura, “Diffractive optical elements in materials inspection,” in International Trends in Optics and Photonics ICO IV, T. Asakura, ed. (Springer, Heidelberg, 1999).
[CrossRef]

M. Nieto-Vesperinas, Scattering and Diffraction in Physical Optics (Wiley, New York, 1991).

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (7)

Fig. 1
Fig. 1

Geometry of the measurement of float-glass thickness.

Fig. 2
Fig. 2

Curve describing the scaling factor of the CCD camera.

Fig. 3
Fig. 3

Variation (error with respect to the real value of 6 mm) in glass thickness as a function of the incident angle.

Fig. 4
Fig. 4

Image of the DOE.

Fig. 5
Fig. 5

Schematic diagram of the sensor. Enlargement of digitized spot array from 2. 2-mm float glass is also shown.

Fig. 6
Fig. 6

Scanner and sensor head. The moving glass ribbon is under the sensor head.

Fig. 7
Fig. 7

User interface and measured data. Left-hand side (up) shows the thickness profile of one scan and the edge distortion of float glass (down). Right-hand side shows the color-coded history of the variation in thickness for a ribbon ∼2 km long.

Equations (5)

Equations on this page are rendered with MathJax. Learn more.

β=arcsinsin α/n2,
x1=d tan β,
x2=2x1 cos α.
C=x2/cos γ.
C=2 tanarcsinsin α/n2cos αcos γ d=Sd.

Metrics