Abstract

According to the response of photoelectric device to a light source, the formula of spectral matching factor of photo cathode-object combination is deduced. The spectral matching factors of Super S25 and New S25 photo cathodes for green vegetation and rough concrete are calculated and compared. For Super S251, the spectral-matching factors for green vegetation and rough concrete are 0.707 and 0.743, respectively, under the full-moon radiation and are 0.504 and 0.577, respectively, under the clear-star radiation. For Super S252, the full-moon factors are 0.561 (green vegetation) and 0.732 (rough concrete), and those for clear-star radiation are 0.338 (green vegetation) and 0.471 (rough concrete). For New S25, the full-moon factors are 0.741 (green vegetation) and 0.762 (rough concrete), and those for clear-star radiation are 0.603 (green vegetation) and 0.657 (rough concrete). An analysis of results shows that the spectral-matching factor has influence on the performance of a low-light level night vision system and is essential for evaluating the visual range of a night-vision system.

© 2004 Optical Society of America

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References

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  1. G. Giakoumakis, “Matching factors for various light-source-photodetector combinations,” Appl. Phys. A 52, 7–9 (1991).
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    [CrossRef] [PubMed]
  3. L. Wei, C. Benkang, “Spectral matching factors of GaAs photocathode for reflecting spectrums of scenes,” Acta Photon. Sin. 28, 857–859 (1999).
  4. L. Wei, C. Benkang, “Spectral matching factors of S25 photocathodes for reflecting spectrum of objects. 1. Dark green paint and green vegetation,” Acta Opt. Sin. 20, 279–282 (2000).
  5. E. H. Eberhardt, “Source-detector spectral matching factors,” Appl. Opt. 7, 2037–2047 (1968).
    [CrossRef] [PubMed]
  6. B. Chang, Multialkali Photocathode Mechanism, Character and Application (Mechanical Industry Press, Beijing, China, 1995) pp. 92–93.
  7. E. A. Richards, “Contrast-enhancement in imaging devices by selection of input photosurface spectral response, Adv. Electron. Electron. Phys. 28, 661–675 (1969).
    [CrossRef]

2000 (1)

L. Wei, C. Benkang, “Spectral matching factors of S25 photocathodes for reflecting spectrum of objects. 1. Dark green paint and green vegetation,” Acta Opt. Sin. 20, 279–282 (2000).

1999 (1)

L. Wei, C. Benkang, “Spectral matching factors of GaAs photocathode for reflecting spectrums of scenes,” Acta Photon. Sin. 28, 857–859 (1999).

1991 (1)

G. Giakoumakis, “Matching factors for various light-source-photodetector combinations,” Appl. Phys. A 52, 7–9 (1991).

1984 (1)

1969 (1)

E. A. Richards, “Contrast-enhancement in imaging devices by selection of input photosurface spectral response, Adv. Electron. Electron. Phys. 28, 661–675 (1969).
[CrossRef]

1968 (1)

Benkang, C.

L. Wei, C. Benkang, “Spectral matching factors of S25 photocathodes for reflecting spectrum of objects. 1. Dark green paint and green vegetation,” Acta Opt. Sin. 20, 279–282 (2000).

L. Wei, C. Benkang, “Spectral matching factors of GaAs photocathode for reflecting spectrums of scenes,” Acta Photon. Sin. 28, 857–859 (1999).

Bhave, B. D.

Chang, B.

B. Chang, Multialkali Photocathode Mechanism, Character and Application (Mechanical Industry Press, Beijing, China, 1995) pp. 92–93.

Eberhardt, E. H.

Giakoumakis, G.

G. Giakoumakis, “Matching factors for various light-source-photodetector combinations,” Appl. Phys. A 52, 7–9 (1991).

Monga, J. C.

Richards, E. A.

E. A. Richards, “Contrast-enhancement in imaging devices by selection of input photosurface spectral response, Adv. Electron. Electron. Phys. 28, 661–675 (1969).
[CrossRef]

Wei, L.

L. Wei, C. Benkang, “Spectral matching factors of S25 photocathodes for reflecting spectrum of objects. 1. Dark green paint and green vegetation,” Acta Opt. Sin. 20, 279–282 (2000).

L. Wei, C. Benkang, “Spectral matching factors of GaAs photocathode for reflecting spectrums of scenes,” Acta Photon. Sin. 28, 857–859 (1999).

Acta Opt. Sin. (1)

L. Wei, C. Benkang, “Spectral matching factors of S25 photocathodes for reflecting spectrum of objects. 1. Dark green paint and green vegetation,” Acta Opt. Sin. 20, 279–282 (2000).

Acta Photon. Sin. (1)

L. Wei, C. Benkang, “Spectral matching factors of GaAs photocathode for reflecting spectrums of scenes,” Acta Photon. Sin. 28, 857–859 (1999).

Adv. Electron. Electron. Phys. (1)

E. A. Richards, “Contrast-enhancement in imaging devices by selection of input photosurface spectral response, Adv. Electron. Electron. Phys. 28, 661–675 (1969).
[CrossRef]

Appl. Opt. (2)

Appl. Phys. A (1)

G. Giakoumakis, “Matching factors for various light-source-photodetector combinations,” Appl. Phys. A 52, 7–9 (1991).

Other (1)

B. Chang, Multialkali Photocathode Mechanism, Character and Application (Mechanical Industry Press, Beijing, China, 1995) pp. 92–93.

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Figures (6)

Fig. 1
Fig. 1

Spectral response of three photo cathodes. 1, New S25; 2, Super S251; 3, Super S252.

Fig. 2
Fig. 2

Relative spectral distribution of the flux reflected from the object. (a) Rough concrete, (b) green vegetation.

Fig. 3
Fig. 3

Calculation of spectral matching factors for green vegetation under full-moon radiation.

Fig. 4
Fig. 4

Calculation of spectral matching factors for green vegetation under clear-star radiation.

Fig. 5
Fig. 5

Calculation of spectral matching factors for rough concrete under full-moon radiation.

Fig. 6
Fig. 6

Calculation of spectral matching factors for rough concrete under clear-star radiation.

Tables (1)

Tables Icon

Table 1 Spectral Matching Factors of S25 Photocathodes for Scenes

Equations (4)

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

Sλ= SλSm.
ϖλ=ρλPλ,
ϖλ= ϖλϖm.
αS, ϖ λ=  Sλϖλdλ ϖλdλ.

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