Abstract

Infrared atmospheric transmission from 0.5 μ to 15 μ is shown as measured over three horizontal paths of 1000 ft, 3.4 statute mi, and 10.1 statute mi. The intense source, a 60-in. carbon arc searchlight, permits a resolution throughout of about 10 wave numbers. Work is continuing in an effort to obtain data taken under a wide range of atmospheric and meteorological conditions. The data presented here represent an average relatively clear winter day, a moderately dense fog and a snowstorm.

© 1957 Optical Society of America

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References

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  1. F. E. Fowle, Smithsonian Inst. Pubis. Misc. Collections 68, No. 8 (1917).
  2. Heinz Fischer, (October, 1946).
  3. J. D. Strong, (November30, 1945).
  4. T. Elder and J. Strong, J. Franklin Inst. 255, 189 (1953).
    [Crossref]
  5. Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).
  6. Arnuf, Bricard, Cure, and Veret, “Transmission by haze and fog, in the spectral region 0.35 to 10 microns,” paper presented by A. Arnulf at the Fourth Congress of the International Commission of Optics, March 28–April 3, 1956, Cambridge, Massachusetts.
  7. Howard, Burch, and Williams, J. Opt. Soc. Am. 46, 186, 236, 242, 334, 452 (1956).
    [Crossref]
  8. L. F. Drummeter, “Infrared absorption of water vapor at 1.8 microns,” thesis, Johns Hopkins University, 1949.
  9. W. H. Cloud, ONR-Johns Hopkins Report, “The 15 micron band of CO2 broadened by nitrogen and helium,” January1, 1952.
  10. T. H. Cosden, (July8, 1955).

1956 (1)

1953 (1)

T. Elder and J. Strong, J. Franklin Inst. 255, 189 (1953).
[Crossref]

1951 (1)

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

1917 (1)

F. E. Fowle, Smithsonian Inst. Pubis. Misc. Collections 68, No. 8 (1917).

Arnuf,

Arnuf, Bricard, Cure, and Veret, “Transmission by haze and fog, in the spectral region 0.35 to 10 microns,” paper presented by A. Arnulf at the Fourth Congress of the International Commission of Optics, March 28–April 3, 1956, Cambridge, Massachusetts.

Arnulf, A.

Arnuf, Bricard, Cure, and Veret, “Transmission by haze and fog, in the spectral region 0.35 to 10 microns,” paper presented by A. Arnulf at the Fourth Congress of the International Commission of Optics, March 28–April 3, 1956, Cambridge, Massachusetts.

Bricard,

Arnuf, Bricard, Cure, and Veret, “Transmission by haze and fog, in the spectral region 0.35 to 10 microns,” paper presented by A. Arnulf at the Fourth Congress of the International Commission of Optics, March 28–April 3, 1956, Cambridge, Massachusetts.

Burch,

Cloud, W. H.

W. H. Cloud, ONR-Johns Hopkins Report, “The 15 micron band of CO2 broadened by nitrogen and helium,” January1, 1952.

Cosden, T. H.

T. H. Cosden, (July8, 1955).

Cure,

Arnuf, Bricard, Cure, and Veret, “Transmission by haze and fog, in the spectral region 0.35 to 10 microns,” paper presented by A. Arnulf at the Fourth Congress of the International Commission of Optics, March 28–April 3, 1956, Cambridge, Massachusetts.

Drummeter, L. F.

L. F. Drummeter, “Infrared absorption of water vapor at 1.8 microns,” thesis, Johns Hopkins University, 1949.

Elder, T.

T. Elder and J. Strong, J. Franklin Inst. 255, 189 (1953).
[Crossref]

Fischer, Heinz

Heinz Fischer, (October, 1946).

Fowle, F. E.

F. E. Fowle, Smithsonian Inst. Pubis. Misc. Collections 68, No. 8 (1917).

Gebbie,

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Harding,

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Hilsum,

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Howard,

Pryce,

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Roberts,

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Strong, J.

T. Elder and J. Strong, J. Franklin Inst. 255, 189 (1953).
[Crossref]

Strong, J. D.

J. D. Strong, (November30, 1945).

Veret,

Arnuf, Bricard, Cure, and Veret, “Transmission by haze and fog, in the spectral region 0.35 to 10 microns,” paper presented by A. Arnulf at the Fourth Congress of the International Commission of Optics, March 28–April 3, 1956, Cambridge, Massachusetts.

Williams,

J. Franklin Inst. (1)

T. Elder and J. Strong, J. Franklin Inst. 255, 189 (1953).
[Crossref]

J. Opt. Soc. Am. (1)

Proc. Roy. Soc. (London) (1)

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Smithsonian Inst. Pubis. Misc. Collections (1)

F. E. Fowle, Smithsonian Inst. Pubis. Misc. Collections 68, No. 8 (1917).

Other (6)

Heinz Fischer, (October, 1946).

J. D. Strong, (November30, 1945).

Arnuf, Bricard, Cure, and Veret, “Transmission by haze and fog, in the spectral region 0.35 to 10 microns,” paper presented by A. Arnulf at the Fourth Congress of the International Commission of Optics, March 28–April 3, 1956, Cambridge, Massachusetts.

L. F. Drummeter, “Infrared absorption of water vapor at 1.8 microns,” thesis, Johns Hopkins University, 1949.

W. H. Cloud, ONR-Johns Hopkins Report, “The 15 micron band of CO2 broadened by nitrogen and helium,” January1, 1952.

T. H. Cosden, (July8, 1955).

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Figures (4)

Fig. 1
Fig. 1

Windshields used with the three searchlights installed on Tilghman Island (10.1-mi path).

Fig. 2
Fig. 2

Windshield used with searchlight installed at the North Beach (Md.) end of the 3.4-mi path. The small light source on the platform left of the windshield is used to record visual transmission.

Fig. 3
Fig. 3

Spectrometers used to record atmospheric transmission from 0.5 μ to 15 μ. The LiF spectrometer (foreground) scans the region from 0.5 μ to 5.2 μ and the NaCl spectrometers cans the region from 2.72 μ to 15 μ.

Figs. 4–8
Figs. 4–8

Atmospheric transmission spectra.

Tables (2)

Tables Icon

Table I Ratio of transmissions over 3.4-mi path during snow storm.

Tables Icon

Table II Ratio of transmissions over 3.4-mi path through fog mixed with light rain.