Author: W. F. Kolbe
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 12
Book Description
Millimeter and Submillimeter Wave Absorption by Atmospheric Pollutants and Constituents
Millimeter and Submillimeter Wave Absorption by Atmospheric Pollutants and Constituents
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Calculated absorption coefficients and rotational transition frequencies are given for a number of polar molecules of interest to pollution and energy research. The results, which are presented in graphical form for microwave frequencies up to 1400 GHz, illustrate the increased absorption line intensities occurring in the submillimeter region. For most species these absorption coefficients attain their maximum values in this region. Included in the calculations are the gases SO2, H2CO, O3, H2O, H2S, OCS, CO, NO, OH, SO, NH3, and CS. A discussion of the techniques currently available for the detection in the submillimeter region of these species is also given.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Calculated absorption coefficients and rotational transition frequencies are given for a number of polar molecules of interest to pollution and energy research. The results, which are presented in graphical form for microwave frequencies up to 1400 GHz, illustrate the increased absorption line intensities occurring in the submillimeter region. For most species these absorption coefficients attain their maximum values in this region. Included in the calculations are the gases SO2, H2CO, O3, H2O, H2S, OCS, CO, NO, OH, SO, NH3, and CS. A discussion of the techniques currently available for the detection in the submillimeter region of these species is also given.
Detection and Measurements of Air Pollutants and Constituents by Millimeter-wave Microwave Spectroscopy
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The properties of millimeter-wave spectrometers as highly specific and sensitive experimental research tools for monitoring gaseous pollutants of interest in pollution research are presented. A spectrometer system operating at frequencies in the vicinity of 70 GHz and employing a semi-confocal Fabry--Perot resonator as the sample cell is described. The resonator is voltage tuned by means of a piezoelectric transducer which enables it to track the microwave source frequency. The operation and performance of the spectrometer are discussed and illustrated by measurements of diluted samples of sulfur dioxide. The noise from the microwave source, the absorption cell and the receiver, which ultimately limits the achievable sensitivity are discussed along with considerations for future sensitivity improvements.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The properties of millimeter-wave spectrometers as highly specific and sensitive experimental research tools for monitoring gaseous pollutants of interest in pollution research are presented. A spectrometer system operating at frequencies in the vicinity of 70 GHz and employing a semi-confocal Fabry--Perot resonator as the sample cell is described. The resonator is voltage tuned by means of a piezoelectric transducer which enables it to track the microwave source frequency. The operation and performance of the spectrometer are discussed and illustrated by measurements of diluted samples of sulfur dioxide. The noise from the microwave source, the absorption cell and the receiver, which ultimately limits the achievable sensitivity are discussed along with considerations for future sensitivity improvements.
Energy Research Abstracts
Absorption of Millimeter to Submillimeter Waves by Atmospheric Water Molecules
Modeling Atmospheric Absorption and Phase Dispersion in the Millimeter and Submillimeter Wave Regions
Author: Joseph H. Pierluissi
Publisher:
ISBN:
Category : Atmospheric radiation
Languages : en
Pages : 40
Book Description
Publisher:
ISBN:
Category : Atmospheric radiation
Languages : en
Pages : 40
Book Description
Scientific and Technical Aerospace Reports
ERDA Energy Research Abstracts
A Study of Millimeter and Submillimeter Wave Attenuation and Dispersion in the Earth's Atmosphere
Author: M. Greenebaum
Publisher:
ISBN:
Category :
Languages : en
Pages : 45
Book Description
A summary is presented of new calculations of atmospheric absorption line parameters and of a slant-path absorption model (SLAM) intended for use in the millimeter and submillimeter wave spectral regions. Results of a literature survey concerning altitude-dependent attenuation and dispersion in this spectral region, as well as weather-dependent scattering and fading strengths, are also summarized. Recommendations are given for reducing the uncertainties in the model predictions. A list of 318 absorption lines of the molecular oxygen isotopes of principal concern in atmospheric transmission below 300/cm is included, together with their integrated strengths at 296K, line widths, lower-state energies, and identifying quantum numbers, in the format of the AFCRL Atmospheric Absorption Line Parameters Compilation.
Publisher:
ISBN:
Category :
Languages : en
Pages : 45
Book Description
A summary is presented of new calculations of atmospheric absorption line parameters and of a slant-path absorption model (SLAM) intended for use in the millimeter and submillimeter wave spectral regions. Results of a literature survey concerning altitude-dependent attenuation and dispersion in this spectral region, as well as weather-dependent scattering and fading strengths, are also summarized. Recommendations are given for reducing the uncertainties in the model predictions. A list of 318 absorption lines of the molecular oxygen isotopes of principal concern in atmospheric transmission below 300/cm is included, together with their integrated strengths at 296K, line widths, lower-state energies, and identifying quantum numbers, in the format of the AFCRL Atmospheric Absorption Line Parameters Compilation.