Atmospheric Transmission in the Infrared

Taylor, John; Yates, Harold W.

doi:10.1364/josa.47.000223

Cited by 80 publications

(19 citation statements)

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“…One additional spectrum ( Fig. 11) was recorded for a short path under maximum resolution with the prism spectrometer by using LiF, CaF, NaCl, and KBr prisms to cover the interval from 0.5 to 26 j' with a resolution ranging from 1 to 2 wave numbers in the region beyond 2 p. Another set of three spectra, one each over the 0.3-, 5.5-, and 16.25-km paths, was published in an earlier report (12) and is not included here. A wide range of precipitable water is represented from 0.11 cm in the 0.3-km path to a maximum of 38 cm in the 16.25-km pathand values of the visual scattering coefficient range from 0.048 km-1 to 0.24 km-1 .…”

Section: Resultsmentioning

confidence: 99%

“…3). The successful use of the carbon axc in this program required considerable care, and the interested reader is referred to the first report on this program for a detailed discussion of its operation (12). For the 0.3-kim and the 5.5-km paths, one light was used as the source, for the 27.7-km path two lights were used, and for the 16.25-km path three lights were used.…”

Section: Naval Research Laboratorymentioning

confidence: 99%

“…Flux collection for each monoehromator was accomplished by a 16-in. focal length, f/3.8 parabolic mirror arranged so that by reflection from two secondary mirrors, the images of several sources placed side by side would be rotated through 90 degrees and appear vertically along the entrance slit of the instrument (12). For the installation on M1auna Loa, one instrument was used, the Medel 12-C Spectrometer, and prisms were changed to cover the full spectrum.…”

Section: Naval Research Laboratorymentioning

confidence: 99%

“…Through such conditions, the received radiation level was usually too low for measurement. Only two successful measurements were made in fouil-weather conditions, one through a light snowstorm and one through fog mixed with light rain (12). The results of these two measurements are listed in Tables 1 and 2, where the transmission ratios between selected wavelength regions are shown.…”

Section: -mentioning

confidence: 99%

“…The present report is the final summary of this effort. Two earlier reports have described the problem and the instrumentation and have given some of the first results (12,13). In an effort to be concise, much detail and some of the results contained in these earlier reports have not been reproduced here.…”

Section: Introduction 1 Introductionmentioning

confidence: 99%

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Infrared Transmission of the Atmosphere

Yates¹,

Taylor²

1960

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The transmission of the atmosphere in the spectral range from 0.5 to 15 p has been studied over three sea-level paths 0.3, 5.5, and 16.25 km in length, with an average spectral resolution, A/AX, of 300. The conditions encountered covered a wide range, from 0.11 cm precipitable water in the 0.3-km path to a maxt-and values of the visual scattering coefficient were measured from 0.048 km-1 to 9.24 km-1 . Data have beet, evaluated on selective transmission vs watervapor concentration for the infrared "window" regions, and the behavior of the scattering coefficient with wavelength has been plotted for representative atmospheres. Similar data were plotted for several measuremeni ,-., -over a range of 27.7 km at an altitude of 10,000 F. PROBLEM STATUSThis is a final report on Problem N03-05, which was terminated Sept. 30, 1959. AUTHORIZATION

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Section: Resultsmentioning

confidence: 99%

Section: Naval Research Laboratorymentioning

confidence: 99%

Section: Naval Research Laboratorymentioning

confidence: 99%

Section: -mentioning

confidence: 99%

Section: Introduction 1 Introductionmentioning

confidence: 99%

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Infrared Transmission of the Atmosphere

Yates¹,

Taylor²

1960

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Losses Suffered by Coherent Light Redirected and Refocused Many Times in an Enclosed Medium

DeLange¹

1965

Bell System Technical Journal

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If a beam of light is to be transmitted for any considerable distance along the surface of the earth, it will have to be redirected at intervals in order to follow the terrain and focused repeatedly to counteract diffraction. The directing and focusing elements, whether lenses or mirrors, will introduce some loss in addition to that produced by the transmission medium itself. The experiment described in this paper was performed to determine the magnitude of the total loss encountered with such transmission and to determine how much of this loss is due to each of the contributing factors. A beam of light, enclosed in a metal pipe, was redirected many times by confocally‐spaced spherical mirrors, and the loss as a function of the distance over which the beam had been transmitted was determined. At the operating wavelength of 6328 Å these losses, which were found to be almost entirely due to mirror deficiencies, amounted to about 1 per cent per reflection. As a result of the loss being largely in the mirrors the loss per mile depends to a considerable extent upon the spacing between these optical elements. The expected loss for a number of assumed spacings is tabulated. The experimental results encourage the belief that beams of coherent light can be redirected and focused many times without excessive loss, and that the mechanical stability required can be obtained — in the laboratory at least.

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Absorption and emission in the atmospheric window from 770 to 1,250 cm⁻¹

Roach

Goody

1958

Quart J Royal Meteoro Soc

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Combined absorption and emission spectra have been recorded in the atmospheric window from 770 to 1,250 cm−1 both in London and in the relatively clean air of Ascot, Berks. The absorption spectra have been partially analysed in terms of selective and continuous extinction. The continuous extinction outweighs the selective in both Ascot and London. There is good agreement between the observed selective absorption and existing theoretical and laboratory data upon gases known to be present in the atmosphere. The opacity of the continuum shows an increase towards low frequency, and it is much greater in London than in Ascot; in both places it is positively correlated with water vapour. The average effective emission temperature of the continuum is not significantly different from that of water vapour. The only hypothesis which seems to fit all the observations is that in London the continuum extinction is largely caused by aerosol extinction while in Ascot this is only of minor importance. This requires that the extinction at Ascot be caused by wings of distant lines; this old suggestion of Elsasser is re‐examined and found to be plausible. Attention is drawn to the important contribution which the continuum can make to the heat balance of the atmosphere below 2 km.

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Atmospheric Transmission in the Infrared

Cited by 80 publications

References 3 publications

Infrared Transmission of the Atmosphere

Infrared Transmission of the Atmosphere

Losses Suffered by Coherent Light Redirected and Refocused Many Times in an Enclosed Medium

Absorption and emission in the atmospheric window from 770 to 1,250 cm⁻¹

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Atmospheric Transmission in the Infrared

Cited by 80 publications

References 3 publications

Infrared Transmission of the Atmosphere

Infrared Transmission of the Atmosphere

Losses Suffered by Coherent Light Redirected and Refocused Many Times in an Enclosed Medium

Absorption and emission in the atmospheric window from 770 to 1,250 cm−1

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Absorption and emission in the atmospheric window from 770 to 1,250 cm⁻¹