Abstract

A method to compute the correct estimates of the field performance of low light level imaging systems is described. The use of luminous equivalence ratio is suggested to correct for the errors caused due to the mismatch between the spectral distribution of the field source and the spectral distribution of the detector-calibrating source. Luminous equivalence ratios for some typical source–device combinations are computed. The results indicate that the extent of this correction becomes quite considerable for certain low light level imaging systems incorporating electrooptical devices having extended red response. A nomograph is presented to illustrate the use of this method for obtaining correct estimates of the field performance.

© 1984 Optical Society of America

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References

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  1. E. A. Richards, Infrared Phys. 8, 101 (1968).
    [CrossRef]
  2. L. M. Biberman, F. A. Rosewell, Proc. Soc. Photo-Opt. Instrum. Eng. 33, 155 (1972).
  3. L. M. Biberman, Appl. Opt. 6, 1127 (1967).
    [CrossRef] [PubMed]
  4. F. H. Barr, E. H. Eberhardt, Appl. Opt. 6, 1575 (1967).
    [CrossRef] [PubMed]
  5. F. E. Nicodemus, Appl. Opt. 7, 1649 (1968).
    [CrossRef] [PubMed]
  6. E. H. Eberhardt, Appl. Opt. 7, 2037 (1968).
    [CrossRef] [PubMed]
  7. J. W. Coltman, J. Opt. Soc. Am. 44, 234 (1954).
    [CrossRef]
  8. Photomultiplier Tubes PIT-700B (RCA Corp., New Jersey, 1971), p. 83.
  9. E. A. Richards, Adv. Electron. Electron Phys. B 28, 661 (1969).
    [CrossRef]
  10. G. R. Elion, H. A. Elion, Electro-Optics Handbook (Marcel Dekker, New York, 1979), Chap. 8, p. 176.
  11. J. Johnson, Image Intensifier Symposium, Fort Belvoir, Va., AD 220160 (1958).

1972 (1)

L. M. Biberman, F. A. Rosewell, Proc. Soc. Photo-Opt. Instrum. Eng. 33, 155 (1972).

1969 (1)

E. A. Richards, Adv. Electron. Electron Phys. B 28, 661 (1969).
[CrossRef]

1968 (3)

1967 (2)

1954 (1)

Barr, F. H.

Biberman, L. M.

L. M. Biberman, F. A. Rosewell, Proc. Soc. Photo-Opt. Instrum. Eng. 33, 155 (1972).

L. M. Biberman, Appl. Opt. 6, 1127 (1967).
[CrossRef] [PubMed]

Coltman, J. W.

Eberhardt, E. H.

Elion, G. R.

G. R. Elion, H. A. Elion, Electro-Optics Handbook (Marcel Dekker, New York, 1979), Chap. 8, p. 176.

Elion, H. A.

G. R. Elion, H. A. Elion, Electro-Optics Handbook (Marcel Dekker, New York, 1979), Chap. 8, p. 176.

Johnson, J.

J. Johnson, Image Intensifier Symposium, Fort Belvoir, Va., AD 220160 (1958).

Nicodemus, F. E.

Richards, E. A.

E. A. Richards, Adv. Electron. Electron Phys. B 28, 661 (1969).
[CrossRef]

E. A. Richards, Infrared Phys. 8, 101 (1968).
[CrossRef]

Rosewell, F. A.

L. M. Biberman, F. A. Rosewell, Proc. Soc. Photo-Opt. Instrum. Eng. 33, 155 (1972).

Adv. Electron. Electron Phys. B (1)

E. A. Richards, Adv. Electron. Electron Phys. B 28, 661 (1969).
[CrossRef]

Appl. Opt. (4)

Infrared Phys. (1)

E. A. Richards, Infrared Phys. 8, 101 (1968).
[CrossRef]

J. Opt. Soc. Am. (1)

Proc. Soc. Photo-Opt. Instrum. Eng. (1)

L. M. Biberman, F. A. Rosewell, Proc. Soc. Photo-Opt. Instrum. Eng. 33, 155 (1972).

Other (3)

G. R. Elion, H. A. Elion, Electro-Optics Handbook (Marcel Dekker, New York, 1979), Chap. 8, p. 176.

J. Johnson, Image Intensifier Symposium, Fort Belvoir, Va., AD 220160 (1958).

Photomultiplier Tubes PIT-700B (RCA Corp., New Jersey, 1971), p. 83.

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Figures (1)

Fig. 1
Fig. 1

Nomograph for estimating the field performance of a typical LLL imaging system incorporating a second generation image intensifier tube (ITT F4758).

Tables (4)

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Table I Spectral Matching Factors for Various Source–Device Combinations

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Table II Relative Spectral Distribution in Full Moon and No Moon Conditions a

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Table III Luminous Equivalence Ratios for Various Source–Device Combinations

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Table IV Estimated Field Performance of LLL Imaging System Incorporating (ITT F-4758) Image Intensifier Tube

Equations (7)

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R L ( cal ) + I ( cal ) / F L ( cal ) = s p α ( det , cal ) 680 α ( eye , cal ) [ A / lm ] ,
R L ( w λ ) = I ( w λ ) / F L ( w λ ) = s p α ( det , w λ ) 680 α ( eye , w λ ) [ A / lm ] ,
F L ( cal ) = K · F L ( w λ ) ,
K = α ( det , w λ ) / α ( det , cal ) α ( eye , w λ ) / α ( eye , cal ) .
Z = F · d · R / N ,
E p h ( w λ ) = E s c · r · T 4 f 2 ( 1 + m ) 2 [ lx ] ,
E p h ( cal ) = K · E p h ( w λ ) .

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