Download or read book Miniature Mass Spectrometers for Upper Atmosphere Composition Measurements written by A. D. Bailey and published by . This book was released on 1966 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: A basic quadrupole mass spectrometer system for neutral and ionized gaseous composition measurements of the upper atmosphere is described. Emphasis is placed on the electronic circuits used with a particular miniature quadrupole rod assembly and ionizer. Circuits described include the power converter, scan waveform generator, dc and rf excitation generators, logarithmic output current amplifier, ion source filament emission regulator and signal-conditioning circuits for telemetering. A summary of performance specifications and critical design dimensions is included. (Author).

Download or read book Miniature Mass Spectrometers for Upper Atmosphere Composition Measurements written by A. D. Bailey and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A basic quadrupole mass spectrometer system for neutral and ionized gaseous composition measurements of the upper atmosphere is described. Emphasis is placed on the electronic circuits used with a particular miniature quadrupole rod assembly and ionizer. Circuits described include the power converter, scan waveform generator, dc and rf excitation generators, logarithmic output current amplifier, ion source filament emission regulator and signal-conditioning circuits for telemetering. A summary of performance specifications and critical design dimensions is included. (Author)

Download or read book Design of Miniaturized Time of Flight Re 2ectron Mass Spectrometer for Upper Atmosphere Density Measurements written by Michelle Lynn Pyle and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Variations of gas and plasma density and composition in Earth0́9s thermosphere and ionosphere are key indicators of interactions between diƠ̐0erent layers of Earth0́9s atmosphere. The nature of interactions between neutral and ion species in the upper atmosphere is an active area of study in Heliophysics and there is much to learn about the dynamic relationship between the ionosphere and neutral thermosphere. Mass Spectrometers are among an array of instruments used to explore Earth0́9s upper atmosphere and other space environments. In the past, data from mass spectrometers Ơ̐2own in low earth orbit has been used to improve atmospheric models and to study the dynamics of the ionosphere and thermosphere. Historically, these instruments are substantial in size and deployed on larger satellite platforms. Data from these larger instruments generally provide information from a speciƠ̐1c point in time at a single location. Studies of atmospheric density and composition with multiple locations for each time point could be performed by CubeSat swarms if proper instrumentation were available to Ơ̐1t CubeSat payload restrictions. The proposed miniaturized time-of-Ơ̐2ight (TOF) mass spectrometer (M.S.) will have a mass resolution and range suƠ̐3cient for measuring the composition of Earth0́9s thermosphere and ionosphere while operating within the power and space constraints of a CubeSat. The capabilities of this instrument could dramatically reduce the cost of future missions while simultaneously enhancing the science return. The design employs miniaturization of TOF-MS technology, including resolution reƠ̐1nement techniques used for larger instruments and standard concepts for TOF-MS components such as acceleration grids, a Bradbury-Nielsen wire gate, a gridless ion mirror, and microchannel plate detector.

Download or read book Design and Characterization of a Time of flight Mass Spectrometer for Composition Measurements in the Upper Atmosphere written by E. Addison Everett and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In-situ composition measurements of the mesosphere/lower thermosphere (MLT) are challenging; this region is only accessible via high-speed sounding rockets, ambient pressures extend into the 10-3 Torr range, and particles of interest range in mass from electrons to meteoric smoke and dust particles. Time-of-flight mass spectrometers (TOF-MS) are capable of making fast, accurate measurements over a wide mass range. However, since they rely on pressure-sensitive microchannel plate (MCP) detectors and high voltages, they have rarely been applied at these altitudes. A new TOF-MS for making in-situ composition measurements in the MLT has been developed at the Space Dynamics Laboratory. This instrument employs modest acceleration potentials and a pressure-tolerant MCP detector. A Bradbury-Nielsen gate is used to produce short, well-defined ion pulses to reduce the temporal and spatial uncertainty of sampled ions. A prototype TOF-MS was constructed and used to demonstrate TOF-MS technology under conditions relevant to in-situ MLT measurements. Operational boundaries and capabilities of this new instrument were identified through laboratory experiments combined with computer modeling. The prototype instrument achieved a maximum resolution of 100 at m/z 40 (Ar), sufficient to resolve major atmospheric species of interest. During experiments at elevated pressures, the MCP detector maintained low background count rates (/second) at pressures as high as 10-3 Torr. A novel getter-based vacuum system was evaluated for use with the new TOF-MS, and a computer model was developed to simulate instrument pressure during a rocket flight. Results from these experiments suggest that when combined with an appropriately sized sampling aperture, this pumping system can extend the measurement range of the instrument to lower altitudes by 10 0́3 20 km, compared to an unpumped instrument. A computer model was developed to study the effects of critical operating parameters on instrument performance; the most important factor affecting resolution was found to be the initial energy spread of sampled ions. Sensitivity and number density measurement analyses suggest the new instrument will measure major species in the MLT at better than 10% uncertainty. Composition measurements made with the new TOF-MS will contribute to a better understanding of the MLT.

Download or read book Radio frequency Mass Spectrometer for the Investigation of the Ionic Composition of the Upper Atmosphere written by V. G. Istomin and published by . This book was released on 1961 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of COSPAR Symposium on Solar Particle Event of November 1969 written by James C. Ulwick and published by . This book was released on 1972 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt: A COSPAR-sponsored Symposium on Solar Particle Events was held at Boston College at Chestnut Hill, Massachusetts on 16, 17, and 18 June 1971. The purpose of the symposium was to present measurements and observations made during the November 1969 Solar Proton Event. This particular event was unique in that extensive solar, magnetospheric and aeronomic measurements by rocket, satellite and ground based techniques were made to provide a comprehensive picture of the phenomenology and morphology of this event. In addition, present knowledge of solar proton events and their effects on the polar ionosphere was reviewed and discussed. This included theoretical studies as well as results from investigations of other solar proton events. The symposium comprised invited as well as contributed papers. A total of 49 papers presented at the symposium are included in these proceedings.

Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1966 with total page 1336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publication AP written by Air Pollution Technical Information Center and published by . This book was released on 1971 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Mass Spectrometer for the Simultaneous Measurement of the Neutral and the Ion Composition of the Upper Atmosphere written by Johannes Geiss and published by . This book was released on 1970 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Instrumentation Papers written by and published by . This book was released on 1966 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1980 with total page 1280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Soviet Space Science Research written by George E. Wukelic and published by Taylor & Francis. This book was released on 2024-04-12 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Soviet Space-Science Research (1968) provides a comprehensive and authoritative English language summary of Soviet space-science research of the 1960s.

Download or read book Remote Sensing of Earth Resources written by NASA Scientific and Technical Information Facility and published by . This book was released on 1970 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The National Union Catalogs 1963 written by and published by . This book was released on 1964 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structure and Dynamics of the Upper Atmosphere written by International School of Atmospheric Physics and published by Elsevier Publishing Company. This book was released on 1974 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applications of Inorganic Mass Spectrometry written by John R. de Laeter and published by John Wiley & Sons. This book was released on 2001-08-27 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seit über 50 Jahren gehört die Massenspektrometrie zu den wichtigsten analytischen Methoden. Neben einem technologiehistorischen Überblick konzentriert sich dieser Band auf die Analytik von Metallen und Elementen. Beschrieben werden Anwendungen aus der Meteorologie, Kerntechnik, Astrochemie, Geowissenschaft und Umwelttechnik. Dabei wird auf zahlreiche spezielle Verfahren eingegangen, u.a. auf die Sektorfeld- und die Sekundärionen-MS, auf induktiv gekoppelte Plasmen und beschleunigergestützte MS. Erläutert werden auch Isotopenverfahren zur Altersbestimmung von Proben.