Atmospheric Transmission of CO2 Laser Radiation with Application to Laser Doppler Systems PDF Download
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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: 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:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 124
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Book Description
Author: S. S. R. Murty
Publisher:
ISBN:
Category : Atmosphere
Languages : en
Pages : 116
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Book Description
Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 824
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 728
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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:
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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Book Description
Author: Valentine Korah
Publisher:
ISBN:
Category : Antitrust law
Languages : en
Pages : 2354
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Book Description
Author: R. A. McClatchey
Publisher:
ISBN:
Category : Atmospheric radiation
Languages : en
Pages : 84
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Book Description
High resolution transmittance curves are presented for the spectral region 320-1400 wave numbers. These spectra are useful as a guide for selecting laser wavelengths for atmospheric propagation studies in this spectral region. In addition, this report provides specific information concerning the attenuation coefficients of 41 CO2 rotational laser lines in the 10.4 micrometer band system (v3 to v1). Charts for predicting the atmospheric attenuation of the CO2 laser lines are provided for each of five climatological model atmospheres and two haze models. The current report extends the work presented in two earlier reports on (1) CO laser attenuation in the 1400-2120/cm−1 (4.72-7. 14 micrometers) region: AFCRL-71-0370 and (2) HF and DF laser attenuation in the 2120-3740/cm (2.67-4.72 micrometers) region: AFCRL-72-0312. This report, when combined with the two previous reports described above, provides synthetic spectra for the entire region from 2.67-31.25 micrometers.
Author: W Duley
Publisher: Elsevier
ISBN: 0323150136
Category : Technology & Engineering
Languages : en
Pages : 444
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Book Description
CO2 Lasers: Effects and Applications examines and summarizes the important applications of the device in different areas of study like physics, chemistry, and engineering. In some parts of the book, the reader is assumed to be knowledgeable in university level mathematics or some specialized area in physics or chemistry. The book consists of 10 chapters where the first two establish the general concepts on lasers and CO2 lasers, respectively. Chapter 3 takes the reader further and presents a comprehensive review of optical components for use such as detectors, windows, and mirrors. Because the CO2 laser is mostly used as a heat source, the theory of laser-surface heating is relevant in the discussion. This theory is presented in Chapter 4. Chapters 5 and 6 meanwhile present a summary of observations on cutting, welding, and some related topics. The following chapters discuss the different applications of CO2 lasers in different areas and processes. Some of these applications include in the generation of thermal effect, laser deposition of thin films, spectroscopy, laser photochemistry, and meteorology and communication systems. The text is a good source of reference to both students and scientists in the areas of physics, chemistry, and engineering.
