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Author: W. A. Spencer Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
As part of the Defense Programs Plant Directed Research and Development Program, the Savannah River Technology Center investigated the emerging area of miniature mass sensors for hydrogen and hydrogen isotope analysis. New sensors from Ferran Scientific and a beta prototype sensor from Mass Sensors, Inc. were purchased. A small pumping platform was designed and assembled. Components for miniature ion traps were investigated based on design information from Oak Ridge National Laboratories. The systems were compared to a conventional residual gas analyzer based on a Stanford Research RGA 300. Each of the sensors investigated had distinct advantages for particular applications. The Ferran system was the least expensive and the smallest, but it had low resolution for hydrogen and deuterium mixtures. The Mass Sensor unit used a new ExB design which achieved excellent resolution of the hydrogen isotopes in a small package. One limitation with the current design was the small 3 to 4 order dynamic range and another was a need for a variable sampling rate to speed analysis over a wider mass range.
Author: W. A. Spencer Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
As part of the Defense Programs Plant Directed Research and Development Program, the Savannah River Technology Center investigated the emerging area of miniature mass sensors for hydrogen and hydrogen isotope analysis. New sensors from Ferran Scientific and a beta prototype sensor from Mass Sensors, Inc. were purchased. A small pumping platform was designed and assembled. Components for miniature ion traps were investigated based on design information from Oak Ridge National Laboratories. The systems were compared to a conventional residual gas analyzer based on a Stanford Research RGA 300. Each of the sensors investigated had distinct advantages for particular applications. The Ferran system was the least expensive and the smallest, but it had low resolution for hydrogen and deuterium mixtures. The Mass Sensor unit used a new ExB design which achieved excellent resolution of the hydrogen isotopes in a small package. One limitation with the current design was the small 3 to 4 order dynamic range and another was a need for a variable sampling rate to speed analysis over a wider mass range.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A theoretical study of the mass spectrometric analysis of mixtures of the hydrogen and helium isotopes shows that mass discrimination and low ion intensity in ion sources are the principal factors that limit accuracy. A virtual-image ion source with short focal length and high brightness avoids these limitations. Suitable analyzers and accessory equipment are available. Development and construction of an ion source with the required characteristics are within the state of the art of mass spectrometry. A high-resolution mass spectrometer with a satisfactory ion source should routinely analyze mixtures of the hydrogen and helium isotopes accurately within +-0.5 percent relative (99.7 percent CL) with ordinary operating techniques. Isotopic equilibrium, auxiliary helium analyses, and accurate standard would not be needed. Analyses accurate within +-0.3 percent relative (99.7 percent CL) could be made by using accurately mixed standards.
Author: A. D. Bailey Publisher: ISBN: Category : Aerospace telemetry Languages : en Pages : 48
Book Description
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).
Author: W. A. Spencer
Author: W. A. Spencer
Author: C. M. Stevens
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Author: Alfred Otto Nier
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Author: 
Author: A. D. Bailey
Author: H. O. Finley
Author: William R. Shields
Author: W. A. Shields