Atmospheric Transmission of Laser Radiation PDF Download
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Author: R. A. McClatchey
Publisher:
ISBN:
Category : LASER (Computer file)
Languages : en
Pages : 144
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Book Description
Author: R. A. McClatchey
Publisher:
ISBN:
Category : LASER (Computer file)
Languages : en
Pages : 144
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 140
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Book Description
A computer code called LASER has been developed and documented and will be made available to interested users. LASER is a version of HITRAN which computes the monochromatic extinction coefficients for both molecular and particulate components of the atmosphere and provides results for a series of atmospheric models from sea level to 100 km in altitude. A detailed description of the calculations leading to these extinction coefficient charts is provided, and charts are provided for a number of specific laser frequencies in order to bring up to date previously published results. In addition, high spectral resolution atmospheric transmission spectra have been provided covering the regions of CO2, CO, and DF laser emission. These plotted spectra represent an up-to-date version of previously published material.
Author: Ernst J. Schiel
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
The emphasis in this program was the development of a high data rate system for use in transmission through the atmosphere. This system was designed to have a large signal-to-noise ratio for distances up to 20 km and can, therefore, tolerate large insertion losses due to unfavorable weather conditions. This system has a maximum capacity of 10 megabits/sec and either PFM, PPM, or PCM can be used. With presently available military PCM equipment, simultaneous transmission of 196 audio channels is feasible. Specifically presented in this paper are: the design and construction of the transmitter and receiver, signal-to-noise considerations, and operational characteristics of the system. An experimental injection laser communication link was set up over a 13 km range. The transmitter was located at Fort Monmouth, N.J. The path of the laser beam traversed various terrain including a wide river, parking lots, woods and suburban areas. The average height of the laser beam above the ground was approximately 25 meters and its path across the water was approximately 1 km. (Author).
Author: Hugo Weichel
Publisher: SPIE Press
ISBN: 9780819404879
Category : Science
Languages : en
Pages : 114
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Book Description
Author: R. A. McClatchey
Publisher:
ISBN:
Category : Absorption spectra
Languages : en
Pages : 122
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Book Description
With the development of the CO laser having emission lines in the range from 1200/cm to greater than 2000/cm, it is of importance to establish which of the more than 200 lines can be transmitted through a variety of atmospheric paths. The spectral region of CO emission spans a very important water vapor absorption band and, in addition, there is absorption by CO2, O3, N2O and CH4. Absorption lines associated with all of these molecules were included in the calculation of synthetic spectra covering the region of CO emission. After limiting the number of CO emission lines to be considered in detail according to a criterion based on atmospheric attenuation, a series of tables was constructed providing quantitative attenuation information for each of 88 laser lines and for 10 different atmospheric models. Data based on two different aerosol scattering models are included in these tables. (Author).
Author: S. S. R. Murty
Publisher:
ISBN:
Category : Carbon dioxide lasers
Languages : en
Pages : 45
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Book Description
The molecular absorption coefficients of carbon dioxide, water vapor, and nitrous oxide are calculated at the P16, P20, P22, and P24 lines of the CO2 laser for temperatures from 200 to 300 K and for pressures from 100 to 1100 mb. The temperature variation of the continuum absorption coefficient of water vapor is taken into account semi-empirically from Burch's data. The total absorption coefficient from the present calculations falls within +/- 20 percent of the results of McClatchey and Selby. The transmission loss which the MSFC CO2 pulsed laser Doppler system experiences has been calculated for the January 1973 flight-test conditions for the five P-lines. The total transmission loss is approximately 7 percent higher at the P16 line and 10 percent lower at the P24 line compared to the P20 line. Comparison of the CO2 laser with HF and DF laser transmission reveals the P2(8) line at 3.8 [mu]m of the DF laser is much better from the transmission point of view for altitudes below 10 km.
Author: Robert W. Fenn
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 224
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Book Description
Author: Robert A. McClatchey
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 148
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Book Description
With the development of HF and DF lasers having emission lines in the range from 2800 to 3700/cm−1 (HF) and 2000 to 2750/cm−1 (DF), it is of importance to establish which of the more than 100 lines can be transmitted through a variety of atmospheric paths. The spectral region of HF emission spans a very important water vapor absorption band and, in addition, there is strong absorption by CO2 and weaker absorption by ozone and methane. The spectral region of DF emission covers the very strong 4.3 micrometer CO2 absorption band and weaker absorption by N2O and HDO at higher frequencies (low DF vibrational transitions). There is some weak ozone absorption also in the region of DF emission. Absorption lines associated with all of these molecules were included in the calculation of synthetic spectra covering the region of HF and DF emission. After limiting the number of emission lines to be considered in detail according to a criterion based on atmospheric attenuation, a series of tables was constructed providing quantitative attenuation information for each of 97 laser lines and for 10 different atmospheric models. Data based on two different aerosol scattering models are included in these tables.
Author: V.E. Zuev
Publisher: Springer Science & Business Media
ISBN: 9400952198
Category : Science
Languages : en
Pages : 303
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Book Description
Unique properties of laser radiation including its monochromatic properties, polarization, high spectral intensity, coherence, narrow beam divergence, the possibility of controlling the pulse duration and radiation spectrum and, finally, the fact that extremely high power and energy create very favorable conditions for the extensive application of lasers to communi cation systems, systems for the lidar sensing and ultra-high-precision ranging, navigation, remote monitoring of the environment, and many other systems operating in the atmosphere. The operative efficiency of the above systems depends significantly on the state of the atmosphere and the corresponding behavior of laser radia tion propagating through it. This circumstance has stimulated the studies of the above regularities during the passt 10-15 years. For the investiga tions to be carried out the scientists were forced to develop new theories and methods for studying the problem experimentally. Moreover, during such investigations some previously unknown phenomena were observed, among them the nonlinear effects accompanying high-power laser radiation propagating through the atmosphere are of paramount importance. Among the nonlinear effects caused by high-power laser radiation inter action with the atmosphere, the effects accompanying the propagation of high-power radiation through the atmospheric aerosols are of particular interest. Aerosols always occur in the atmosphere. It should be noted that the microphysical and optical characteristics of atmospheric aerosols vary widely, this fact causes a great variety in the features of their inter action with radiation.
Author:
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 854
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Book Description
