Abstract

The surface quality of an optical lens can be quantitatively measured using a scatter ratio test. A collimated light beam is focused by the test lens upon an opaque spot. A detector behind the spot measures light scattered past the spot. The spot is then displaced to the side so that total energy out of the lens is measured by the detector. The scatter ratio is the ratio of the two detector outputs. The test is shown to be reproducible and insensitive to operator effects. It is shown to be an effective process control tool for detecting changes in surface finish. The relationship between stylus measurements of lens surface roughness and the scatter ratios is shown.

© 1983 Optical Society of America

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References

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  1. , “Optical Components for Fire Control Instruments; General Specification Governing the Manufacture, Assembly and Inspection Of,” MIL-0-13830A, available from Commanding Officer, Naval Supply Depot, 518 Tabor Ave., Philadelphia 19120.
  2. , “Definitions, Methods of Testing, and Specifications for Appearance Imperfections of Optical Elements and Assemblies,” PH 3.617–1980, American National Standards Institute, 1430 Broadway, New York 10018.
  3. R. J. Hudak, Opt. News 7, No.3, 7 (1981).
    [CrossRef]
  4. T. V. Vorburger, E. C. Teague, Precis. Eng. 3, 61 (Apr.1981).
    [CrossRef]
  5. Herculene Drafting Media, Matte One Side, Product 191155.
  6. , “A Surface View,” Quality 16 (June1982).
  7. R. H. Woodward, P. L. Goldsmith, Cumulative Sum Techniques (Oliver & Boyd, London, 1964).
  8. P. L. Goldsmith, H. Whitfield, Technometrics 3, 11 (1961).
    [CrossRef]
  9. G. B. Wetherill, Cumulative Sum Chart (Chapman & Hall, London, 1977).
  10. Cumulative Sum Techniques, ICI Monograph 3 (Van Nostrand, Princeton, 1964).
  11. H. M. Traux, Ind. Qual. Contol. 18, No. 6, 18 (1961).
  12. W. D. Ewan, Technometrics 5, 1 (1963).
    [CrossRef]
  13. G. E. P. Box, W. G. Hunter, J. S. Hunter, Statistics for Experimenters (Wiley, New York, 1978).

1982 (1)

, “A Surface View,” Quality 16 (June1982).

1981 (2)

R. J. Hudak, Opt. News 7, No.3, 7 (1981).
[CrossRef]

T. V. Vorburger, E. C. Teague, Precis. Eng. 3, 61 (Apr.1981).
[CrossRef]

1963 (1)

W. D. Ewan, Technometrics 5, 1 (1963).
[CrossRef]

1961 (2)

P. L. Goldsmith, H. Whitfield, Technometrics 3, 11 (1961).
[CrossRef]

H. M. Traux, Ind. Qual. Contol. 18, No. 6, 18 (1961).

Box, G. E. P.

G. E. P. Box, W. G. Hunter, J. S. Hunter, Statistics for Experimenters (Wiley, New York, 1978).

Ewan, W. D.

W. D. Ewan, Technometrics 5, 1 (1963).
[CrossRef]

Goldsmith, P. L.

P. L. Goldsmith, H. Whitfield, Technometrics 3, 11 (1961).
[CrossRef]

R. H. Woodward, P. L. Goldsmith, Cumulative Sum Techniques (Oliver & Boyd, London, 1964).

Hudak, R. J.

R. J. Hudak, Opt. News 7, No.3, 7 (1981).
[CrossRef]

Hunter, J. S.

G. E. P. Box, W. G. Hunter, J. S. Hunter, Statistics for Experimenters (Wiley, New York, 1978).

Hunter, W. G.

G. E. P. Box, W. G. Hunter, J. S. Hunter, Statistics for Experimenters (Wiley, New York, 1978).

Teague, E. C.

T. V. Vorburger, E. C. Teague, Precis. Eng. 3, 61 (Apr.1981).
[CrossRef]

Traux, H. M.

H. M. Traux, Ind. Qual. Contol. 18, No. 6, 18 (1961).

Vorburger, T. V.

T. V. Vorburger, E. C. Teague, Precis. Eng. 3, 61 (Apr.1981).
[CrossRef]

Wetherill, G. B.

G. B. Wetherill, Cumulative Sum Chart (Chapman & Hall, London, 1977).

Whitfield, H.

P. L. Goldsmith, H. Whitfield, Technometrics 3, 11 (1961).
[CrossRef]

Woodward, R. H.

R. H. Woodward, P. L. Goldsmith, Cumulative Sum Techniques (Oliver & Boyd, London, 1964).

Ind. Qual. Contol. (1)

H. M. Traux, Ind. Qual. Contol. 18, No. 6, 18 (1961).

Opt. News 7 (1)

R. J. Hudak, Opt. News 7, No.3, 7 (1981).
[CrossRef]

Precis. Eng. (1)

T. V. Vorburger, E. C. Teague, Precis. Eng. 3, 61 (Apr.1981).
[CrossRef]

Quality (1)

, “A Surface View,” Quality 16 (June1982).

Technometrics (2)

P. L. Goldsmith, H. Whitfield, Technometrics 3, 11 (1961).
[CrossRef]

W. D. Ewan, Technometrics 5, 1 (1963).
[CrossRef]

Other (7)

G. E. P. Box, W. G. Hunter, J. S. Hunter, Statistics for Experimenters (Wiley, New York, 1978).

G. B. Wetherill, Cumulative Sum Chart (Chapman & Hall, London, 1977).

Cumulative Sum Techniques, ICI Monograph 3 (Van Nostrand, Princeton, 1964).

R. H. Woodward, P. L. Goldsmith, Cumulative Sum Techniques (Oliver & Boyd, London, 1964).

Herculene Drafting Media, Matte One Side, Product 191155.

, “Optical Components for Fire Control Instruments; General Specification Governing the Manufacture, Assembly and Inspection Of,” MIL-0-13830A, available from Commanding Officer, Naval Supply Depot, 518 Tabor Ave., Philadelphia 19120.

, “Definitions, Methods of Testing, and Specifications for Appearance Imperfections of Optical Elements and Assemblies,” PH 3.617–1980, American National Standards Institute, 1430 Broadway, New York 10018.

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Figures (3)

Fig. 1
Fig. 1

Scatter ratio test.

Fig. 2
Fig. 2

Scatter ratio from average roughness.

Fig. 3
Fig. 3

CUSUM use.

Equations (2)

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SR ¯ = 0.0226
SR ¯ = 0.0218

Metrics