Abstract

We present a description of a new goniospectroradiometric measurement system developed at the National Physical Laboratory (NPL). The instrument incorporates a modified array spectrometer and a series of rotary stages to allow measurement of the spectral radiant intensity distribution of a variety of different types of light source from 350 to 830nm. Associated source properties such as chromaticity and correlated color temperature distributions and total spectral flux are then calculated from the radiant intensity data. A preliminary comparison with NPL’s integrating sphere-based luminous flux scale shows agreement to within 0.4%, well within the combined measurement uncertainty. Measurements of the luminous intensity and color temperature distributions and the spectral total flux of a tungsten filament flux standard, a white LED cluster and a compact fluorescent source made using the goniospectroradiometer, are also presented.

© 2008 Optical Society of America

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References

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  1. Y. Zong and Y. Ohno, “Realization of total spectral radiant flux scale and calibration service at NIST,” CIE Proceedings 26th Session Beijing (Commission Internationale de l'Elairage, 2007), Vol. D2, pp. 179-182.
  2. T. M. Goodman, J. R. Moore, N. C. Pearce, and D. K. Murray, “The establishment of a new national scale of spectral total flux,” CIE Proceedings 22nd Session Melbourne 1991(Commission Internationale de l'Elairage, 1991), Vol. 1, pp. 50-53.
  3. O. C. Jones and R. G. Berry, “A new determination of the lumen,” Metrologia 6, 81-89 (1970).
    [CrossRef]
  4. http://www.lmt.de/en/gods1620.html.
  5. CIE Publication number 70: The measurement of absolute luminous intensity distributions (1987).
  6. G. R. Hopkinson, T. M. Goodman, and S. R. Prince, A Guide to the Use and Calibration of Detector Array Equipment, Press Monograph Vol. PM142 (SPIE, 2004).
  7. Y. Zong, S. W. Brown, C. J. Johnson, K. R. Lykke, and Y. Ohno, “Simple spectral stray light correction method for array spectroradiometers,” Appl. Opt. 45, 1111-1119 (2006).
    [CrossRef] [PubMed]
  8. E. R. Woolliams, N. P. Fox, M. G. Cox, P. M. Harris, and N. J. Harrison, “Final report on CCPR K1-a: Spectral irradiance from 250 nm to 2500 nm,” Metrologia 43, 02003 (2006).
    [CrossRef]
  9. ISO 10527:2007(E)/CIE S 014-1/E:2006, “Joint ISO/CIE Standard: CIE Standard Colorimetric Observers,” CIE Publication 15:2004, Colorimetry3rd Ed., (CIE, 2004).

2006 (2)

E. R. Woolliams, N. P. Fox, M. G. Cox, P. M. Harris, and N. J. Harrison, “Final report on CCPR K1-a: Spectral irradiance from 250 nm to 2500 nm,” Metrologia 43, 02003 (2006).
[CrossRef]

Y. Zong, S. W. Brown, C. J. Johnson, K. R. Lykke, and Y. Ohno, “Simple spectral stray light correction method for array spectroradiometers,” Appl. Opt. 45, 1111-1119 (2006).
[CrossRef] [PubMed]

1970 (1)

O. C. Jones and R. G. Berry, “A new determination of the lumen,” Metrologia 6, 81-89 (1970).
[CrossRef]

Berry, R. G.

O. C. Jones and R. G. Berry, “A new determination of the lumen,” Metrologia 6, 81-89 (1970).
[CrossRef]

Brown, S. W.

Cox, M. G.

E. R. Woolliams, N. P. Fox, M. G. Cox, P. M. Harris, and N. J. Harrison, “Final report on CCPR K1-a: Spectral irradiance from 250 nm to 2500 nm,” Metrologia 43, 02003 (2006).
[CrossRef]

Fox, N. P.

E. R. Woolliams, N. P. Fox, M. G. Cox, P. M. Harris, and N. J. Harrison, “Final report on CCPR K1-a: Spectral irradiance from 250 nm to 2500 nm,” Metrologia 43, 02003 (2006).
[CrossRef]

Goodman, T. M.

T. M. Goodman, J. R. Moore, N. C. Pearce, and D. K. Murray, “The establishment of a new national scale of spectral total flux,” CIE Proceedings 22nd Session Melbourne 1991(Commission Internationale de l'Elairage, 1991), Vol. 1, pp. 50-53.

G. R. Hopkinson, T. M. Goodman, and S. R. Prince, A Guide to the Use and Calibration of Detector Array Equipment, Press Monograph Vol. PM142 (SPIE, 2004).

Harris, P. M.

E. R. Woolliams, N. P. Fox, M. G. Cox, P. M. Harris, and N. J. Harrison, “Final report on CCPR K1-a: Spectral irradiance from 250 nm to 2500 nm,” Metrologia 43, 02003 (2006).
[CrossRef]

Harrison, N. J.

E. R. Woolliams, N. P. Fox, M. G. Cox, P. M. Harris, and N. J. Harrison, “Final report on CCPR K1-a: Spectral irradiance from 250 nm to 2500 nm,” Metrologia 43, 02003 (2006).
[CrossRef]

Hopkinson, G. R.

G. R. Hopkinson, T. M. Goodman, and S. R. Prince, A Guide to the Use and Calibration of Detector Array Equipment, Press Monograph Vol. PM142 (SPIE, 2004).

Johnson, C. J.

Jones, O. C.

O. C. Jones and R. G. Berry, “A new determination of the lumen,” Metrologia 6, 81-89 (1970).
[CrossRef]

Lykke, K. R.

Moore, J. R.

T. M. Goodman, J. R. Moore, N. C. Pearce, and D. K. Murray, “The establishment of a new national scale of spectral total flux,” CIE Proceedings 22nd Session Melbourne 1991(Commission Internationale de l'Elairage, 1991), Vol. 1, pp. 50-53.

Murray, D. K.

T. M. Goodman, J. R. Moore, N. C. Pearce, and D. K. Murray, “The establishment of a new national scale of spectral total flux,” CIE Proceedings 22nd Session Melbourne 1991(Commission Internationale de l'Elairage, 1991), Vol. 1, pp. 50-53.

Ohno, Y.

Y. Zong, S. W. Brown, C. J. Johnson, K. R. Lykke, and Y. Ohno, “Simple spectral stray light correction method for array spectroradiometers,” Appl. Opt. 45, 1111-1119 (2006).
[CrossRef] [PubMed]

Y. Zong and Y. Ohno, “Realization of total spectral radiant flux scale and calibration service at NIST,” CIE Proceedings 26th Session Beijing (Commission Internationale de l'Elairage, 2007), Vol. D2, pp. 179-182.

Pearce, N. C.

T. M. Goodman, J. R. Moore, N. C. Pearce, and D. K. Murray, “The establishment of a new national scale of spectral total flux,” CIE Proceedings 22nd Session Melbourne 1991(Commission Internationale de l'Elairage, 1991), Vol. 1, pp. 50-53.

Prince, S. R.

G. R. Hopkinson, T. M. Goodman, and S. R. Prince, A Guide to the Use and Calibration of Detector Array Equipment, Press Monograph Vol. PM142 (SPIE, 2004).

Woolliams, E. R.

E. R. Woolliams, N. P. Fox, M. G. Cox, P. M. Harris, and N. J. Harrison, “Final report on CCPR K1-a: Spectral irradiance from 250 nm to 2500 nm,” Metrologia 43, 02003 (2006).
[CrossRef]

Zong, Y.

Y. Zong, S. W. Brown, C. J. Johnson, K. R. Lykke, and Y. Ohno, “Simple spectral stray light correction method for array spectroradiometers,” Appl. Opt. 45, 1111-1119 (2006).
[CrossRef] [PubMed]

Y. Zong and Y. Ohno, “Realization of total spectral radiant flux scale and calibration service at NIST,” CIE Proceedings 26th Session Beijing (Commission Internationale de l'Elairage, 2007), Vol. D2, pp. 179-182.

Appl. Opt. (1)

Metrologia (2)

O. C. Jones and R. G. Berry, “A new determination of the lumen,” Metrologia 6, 81-89 (1970).
[CrossRef]

E. R. Woolliams, N. P. Fox, M. G. Cox, P. M. Harris, and N. J. Harrison, “Final report on CCPR K1-a: Spectral irradiance from 250 nm to 2500 nm,” Metrologia 43, 02003 (2006).
[CrossRef]

Other (6)

ISO 10527:2007(E)/CIE S 014-1/E:2006, “Joint ISO/CIE Standard: CIE Standard Colorimetric Observers,” CIE Publication 15:2004, Colorimetry3rd Ed., (CIE, 2004).

Y. Zong and Y. Ohno, “Realization of total spectral radiant flux scale and calibration service at NIST,” CIE Proceedings 26th Session Beijing (Commission Internationale de l'Elairage, 2007), Vol. D2, pp. 179-182.

T. M. Goodman, J. R. Moore, N. C. Pearce, and D. K. Murray, “The establishment of a new national scale of spectral total flux,” CIE Proceedings 22nd Session Melbourne 1991(Commission Internationale de l'Elairage, 1991), Vol. 1, pp. 50-53.

http://www.lmt.de/en/gods1620.html.

CIE Publication number 70: The measurement of absolute luminous intensity distributions (1987).

G. R. Hopkinson, T. M. Goodman, and S. R. Prince, A Guide to the Use and Calibration of Detector Array Equipment, Press Monograph Vol. PM142 (SPIE, 2004).

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Figures (16)

Fig. 1
Fig. 1

Schematic diagram of the NPL goniospectroradiometer showing the configuration when measuring the spectral radiant intensity of a light source at different zenith angles for compact light sources (i.e., without the mirror in the light path). A section of the mirror has been removed to show the mounting of the array spectrometer behind the mirror.

Fig. 2
Fig. 2

Schematic diagram of the NPL goniospectroradiometer configured for measurements on compact light sources (i.e., without the mirror in the light path). A section of the mirror has been removed to show the mounting of the array spectrometer behind the mirror.

Fig. 3
Fig. 3

Transmittance of a 3 mm thick GG435 colored glass filter measured using six different array spectrometers.

Fig. 4
Fig. 4

Measured regular transmittance of four stray light blocking filters used on the NPL goniospectroradiometer.

Fig. 5
Fig. 5

Transmittance of colored glass filters measured using tungsten lamp and Andor array spectrometer with and without stray light blocking filters.

Fig. 6
Fig. 6

Measured luminous intensity distribution of a 1 kW tungsten filament flux standard.

Fig. 7
Fig. 7

Measured CCT distribution of a 1 kW tungsten filament flux standard.

Fig. 8
Fig. 8

Measured spectral total flux of a 1 kW tungsten filament flux standard.

Fig. 9
Fig. 9

Measured luminous intensity distribution of a white LED cluster.

Fig. 10
Fig. 10

Measured CCT distribution of a white LED cluster.

Fig. 11
Fig. 11

Scatterplot showing x and y chromaticity coordinates for a white LED cluster measured in different directions around the source.

Fig. 12
Fig. 12

Measured spectral total flux of a white LED cluster.

Fig. 13
Fig. 13

Measured luminous intensity distribution of a 2D compact fluorescent lamp.

Fig. 14
Fig. 14

Measured CCT of a 2D compact fluorescent lamp.

Fig. 15
Fig. 15

Scatterplot showing x and y chromaticity coordinates for a compact fluorescent lamp measured in different directions around the source.

Fig. 16
Fig. 16

Measured spectral total flux of a 2D compact fluorescent lamp.

Equations (2)

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Φ e ( λ ) = 0 2 π 0 π I e ( λ , C , γ ) sin γ d γ d C .
Φ e ( λ ) = n = 1 N I e ( λ , γ n , C n ) P n sin γ d A .

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