Infrared continuum absorption by atmospheric water vapor in the 8-12-µm window

Applied Optics

Volumn 15, Issue 9, 1976, Pages 2085-2090

  Roberts, Robert E ^a   Selby, John E A ^b   Biberman, Lucien M ^a  

^a INSTITUTE FOR DEFENSE ANALYSES   (United States)

^b AIR FORCE RESEARCH LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ATMOSPHERIC OPTICS;

EID: 0016995093     PISSN: 1559128X     EISSN: 21553165     Source Type: Journal    
DOI: 10.1364/AO.15.002085     Document Type: Article

References (32)

1. A. F. Milton, G. L. Harvey, J. C. Kershenstein, and M. D. Milo- losko, "A Comparison of the 3-5 µm and 8-12 µm Regions for Advanced Thermal Imaging Systems Using the lowtran II Atmospheric Transmission Model," NRL Memorandum Report 3098 (August 1975).
2. L. M. Biberman, "Effect of Weather at Hannover, Germany, on Performance of Electro-Optical Systems," in Part I: Theory, Methodology, and Data Base, IDA Report (in press), 1976.
3. J. C. Gille, "Methods of Calculating Infrared Transfer in the Atmosphere-A Review," Proceedings UCLA International Conference on Radiation and Remote Probing of the Atmo- sphere, J. G. Kuriyan, Ed. (Western Periodicals, North Holly- wood, Calif., 1974), p. 395.
4. J. E. A. Selby and R. A. McClatchey, "Atmospheric Transmit- tance from 0.25 to 28.5 µm: Computer Code LOWTRAN III," AFCRL-TR-75-0255, ERP 513 and references cited therein (7 May 1975).
5. R. Moulton, Night Vision Laboratory, Fort Belvoir, Va., private communication (November 1975).
6. These conditions are typified by the transmission data analyzed in this paper, namely, D. Lane, "Comparative Measurements of Infra-Red Transmission over a Long Overseas Path," EMI Report DMP3858 and DMP3736 (1970). These reports include mea- surements made under predominantly maritime conditions for L = 20 km during both winter
7. D. E. Burch, "Investigation of the Absorption of Infrared Radiation by Atmospheric Gases," Semiannual Technical Report, Aeronutronic Division, Philco Ford Corporation, Aeronutronic Report U-4784 (31 January 1971).
8. J. H. McCoy, D. B. Rensch, and R. K. Long, Appl. Opt. 8, 1471 (1969).
9. For broadband measurements the extinction coefficients are defined by the appropriate bandwidth-average transmission.
10. -1 and L in km.
11. In our analyses and fit of the 8-12-µm window we will include continuum data out to 30 µm.
12. 3 in this region; however, it is not important for sea level broadband measurements as discussed here.
13. 2 mixture (1975) made available to us by R. K. Long, private communication (December 1975).
14. V. N. Arefev, V. I. Dianov-Klokov, V. F. Radionov, and N. I. Sizov, Opt. Spektrosk. 39, 560 (1975) reported in a review article by T. G. Adiks, V. N. Arefev, and V. I. Dianov-Klokov, Sov. J. Quantum Electron. 5, № 5, 481 (May 1975).
15. For the present analysis it is not necessary forto be identically zero. The important point is that it be a constant, independent of
16. Our analysis of the EMI measurements was actually based upon the complete computer data tapes rather than the summaries represented by the above EMI report.6
17. The summer and winter means were 16° and 8°, respectively.
18. The methods employed include (a) linear filtering combined with linear regression on the filtered data, (b) straightforward linear regression on the entire 103-point data base, and (c) linear regression on the fifteen best transmission measurements for each absolute humidity; the best data were simply chosen by selecting the lowest extinction coefficient for each
19. In the 7. 9-11.3-µm region, has a weaker water vapor dependence thanand is also usually smaller in magnitude.
20. Varanasi, S. Chou, and S. S. Penner, J. Quant. Spectrosc. Radiat. Transfer 8, 1537 (1968).
21. 2O continuum in the 8-12-µm region have been made available to us by D. Gryvnak, private communication (November 1975).
22. 2 broadening coefficient (see discussion later in text).
23. C. M. R. Platt, J. Geophys. Res. 77, 1597 (1972) and references cited therein.
24. -l," Final Report for Period 16 October 1973-30 September 1974, Aeronutronic Division, Philco Ford Corporation, AFCRL-TR-74-0377 (September 1974).
25. 4 /[Λ(µm)J.
26. 2 = 0.89.
27. The original data measurements also included points from 10 µm to 12 µm; however, these are coincident with the most recent measurements indicated as solid circles (O).
28. 8
29. -1).
30. The broadband EMI transmission measurements were made with a carbon arc light source with a blackbody temperature of about 3800 K. Hence, the photon density near 8 µm is substantially larger than at 12 µm.
31. K. J. Bignell, Q. J. R. Meteorol. Soc. 96, 390 (1970).
32. Felix Franks, Ed., "Water: A Comprehensive Treatise," in The Physics and Physical Chemistry of Water" (Plenum, New York, 1972), Vol. 1.