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Author: Clair L. Wyatt Publisher: ISBN: Category : Languages : en Pages : 36
Book Description
An infrared spectrometer used to obtain atmospheric emission spectra from a rocket at altitudes between 45 and 200 km in the ICECAP Auroral Measurements Program is described. The instrument continuously scanned the 6.75-23.2 micrometers spectral region at the rate of 2 scans per second. The instrument resolution of the spectrometer, which employed a circular-variable interference filter (CVF), ranged from 3 to 4 percent.
Author: Clair L. Wyatt Publisher: ISBN: Category : Languages : en Pages : 36
Book Description
An infrared spectrometer used to obtain atmospheric emission spectra from a rocket at altitudes between 45 and 200 km in the ICECAP Auroral Measurements Program is described. The instrument continuously scanned the 6.75-23.2 micrometers spectral region at the rate of 2 scans per second. The instrument resolution of the spectrometer, which employed a circular-variable interference filter (CVF), ranged from 3 to 4 percent.
Author: James W. Rogers Publisher: ISBN: Category : Auroras Languages : en Pages : 132
Book Description
A liquid-helium-cooled, long-wavelength infrared (LWIR) spectrometer was successfully launched by the Air Force Geophysics Laboratory onboard a Black Brant VC rocket (A18.006-2) on 22 Mar 1973 from the University of Alaska's Poker Flat Research Range at Chatanika, Alaska. This flight was part of the Defense Nuclear Agency ICECAP 73 Program. The spectrometer, which employs a circular-variable filter (CVF), was developed by AFGL and Utah State University and has provided the first measurements of the altitude profile of the infrared spectrum of the upper-atmospheric emissions between 7 and 24 micrometers. During an IBC II aurora, data were obtained on the 15-micrometer carbon dioxide emission from 65 to 150 km and on the 9.6 micrometer ozone emission between 45 and 100 km. In addition, emission data on the long-wavelength wing of the 6.3 micrometer water band between 6.7 and 7.6 micrometers were also obtained between 50 and 75 km. Above 100 km, significant unidentified emission was observed at 9.3 micrometers with weaker features at 6.9, 7.3, 8.0, 11.1, and 12.3 micrometers. This report documents in detail the data obtained along with the rocket and payload performance, the auroral conditions at launch and a comparison with theoretical models.
Author: James W. Rogers Publisher: ISBN: Category : Atmosphere, Upper Languages : en Pages : 124
Book Description
A liquid-helium-cooled, long-wavelength infrared (LWIR) spectrometer was successfully launched on 14 Feb 1974 from the University of Poker Flat Research Range at Chatanika, Alaska, part of the DNA ICECAP 74 Program. The Spectrometer, which employs a circular-variable filter, was almost identical to one flown on 22 Mar 1973 that provided the first measurements of the altitude profile of the infrared spectrum of the upper-atmospheric emissions between 7 and 24 micrometers. The 1973 measurements were from an energetically pumped atmosphere during the occurrence of an IBC II aurora. The objective of the 1974 flight was to obtain emission data from an aurorally quiet atmosphere to determine the contribution of the auroral energy input to the data obtained in 1973. The payload was successfully launched during nonauroral conditions, and data were obtained on the 15 micrometer carbon dioxide (nu 2) emission from 74 to 160 km and on the 9.6 micrometer ozone (nu 3) emission between 74 and 110 km. Above 110 km, significant unidentified emission was again observed at 9.3 micrometers.
Author: James W. Rodgers Publisher: ISBN: Category : Atmosphere, Upper Languages : en Pages : 56
Book Description
A liquid-helium-cooled long-wavelength infrared spectrometer was successfully launched on 22 March 1973 from the Poker Flats Research Facility, Alaska. This spectrometer, which employed a circular variable filter (CVF), was developed over a period of five years and provided the first measurements of the infrared spectrum of the upper atmospheric emissions between 7 and 24 micrometers. The data processing proceeded in a step-by-step manner to provide accurate final data with error limits and an understanding of the spectrometer performance. Each step of the data processing is presented in this report which will provide engineers with information on the spectrometer performance and data analysts with the basis for the final assignment of error limits. Similar procedures can also be used for the data reduction of other CVF flights.
Author: Clair L. Wyatt Publisher: ISBN: Category : Infrared spectroscopy Languages : en Pages : 26
Book Description
The report concerns the development of high-vacuum liquid-helium cooled circular-variable filter spectrometers. These spectrometers have been successfully used in rocketborne applications to make in situ measurements of the overhead spectral radiance, as a function of rocket height, of the atmospheric emission species in the long wavelength region of the infrared. This research led to the advancement of the state-of-the-art in such aerospace infrared measurements and in several related areas such as the detector-preamplifier interface and cold bearing design. A total of five rocket flights were conducted which resulted in measurements of the overhead radiance, as a function of rocket altitude between 45 and 200 km, of the atmospheric emissions in the 7 to 24 micrometer range of the infrared.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 662
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Walter J. Williams Publisher: ISBN: Category : Languages : en Pages : 18
Book Description
A Littrow grating spectrometer designed to operate in a liquid helium dewar at a temperature of 4K was constructed as the major effort in this program. The problems associated with construction of such an instrument and the methods used to solve them are discussed. The spectrometer was designed to be used on a balloon-borne platform and to measure the atmospheric emission as a function of wavelength and altitude. Use of the spectrometer in this fashion requires that the liquid helium dewar used to house the spectrometer be equipped with an appropriate infrared window. This window is a source of background noise for the spectrometer and in order to achieve sensitivity the window is cooled by liquid nitrogen to 77K. Techniques for keeping atmospheric H2O and CO2 from freezing on to the window were developed and incorporated into the final balloon-borne system.
Author: Robert R. O'Neil Publisher: ISBN: Category : Atmospheric radiation Languages : en Pages : 20
Book Description
Atomic and molecular emissions from 1600 angstroms to 2800 angstroms and from 1.5 to 22 microns were measured by on-board instruments at altitude range 70 to 128 km. The observed dominant emissions are N2 Wu-Bensch, C02 at 4.3 micron and N0 at 5.4 micron.
Author: Clair L. Wyatt
Author: Clair L. Wyatt
Author: James W. Rogers
Author: James W. Rogers
Author: James W. Rodgers
Author: Clair L. Wyatt
Author: 
Author: 
Author: Walter J. Williams
Author: 
Author: Robert R. O'Neil