Low-Concentration NO x Gas Analysis Using Single Bimodular ZnO Nanorod Sensor
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Chemistry↗
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Results for “gas analysis”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Design and Characterization of a Printed Circuit Board-Based Gas Chromatography Column for Greenhouse Gas Analysis
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Rael, Ashur Scott↗
Gas analysis with pulsed vacuum networks.
Molecular flow network theory extended to pulsed operation with gases mixtures having various molecular weights
Kendall, B. R. F.↗
Computer-controlled mass spectrometer for on-line gas analysis
System detects gases in combustion chambers and records their levels of concentration. Simplified data recording and reduction process permits analysis rate of 9 msec per peak and recording of probe position, pressures, temperatures, and mass spectrometer data on same tape. System is applicable to air pollution control.
Hafner, F. W.↗
A computer program to automate residual gas analysis
A computer program for automatic determination of gases found in an environmental chamber during spacecraft testing is discussed. Program testing is reviewed. The program is being used for the solution of experimental spectra, where the mass spectrometer is used as a contamination monitor by an untrained spectroscopist.
Shapiro, H.↗
Solar wind rare gas analysis: Trapped solar wind helium and neon in Surveyor 3 material
The He-4 and Ne-20 contents in sections of the Surveyor 3 support strut samples were determined by optical and scanning electron microscopy and are compared to the results of the Apollo solar wind composition (SWC) experiments. The He-4/Ne-20 ratio in the samples from the sunlit side of the strut was approximately 300; the ratios determined in Apollo 12 lunar fines and SWC foil were below 100. The He-4/He-3 ratios were also determined, and the ratio obtained from Surveyor 3 material is higher than those found with Apollo 11 and 12 SWC experiments. The effects of spallation by cosmic rays or solar protons, stripping by cosmic ray or energetic solar alpha particles, recycling of solar wind He and radiogenic Ne, He from terrestrial atmosphere, mass discrimination near the moon, mass dependence of trapping probability, diffusion, and contamination by lunar dust are considered.
Buehler, F.↗
Dynamic delta method for trace gas analysis
Method has been developed in which measurements are made only over viscous flow range, eliminating fractionation before the molecular leak and problems due to surface elution.
Wood, G. M.↗
Search for Xe-129 in mineral grains from Allende inclusions - An exercise in miniaturized rare gas analysis
The paper considers the use of a static mass spectrometer modified by installation of a Baur-Signer ion source and an ion-counting system to detect xenon from single grains from inclusions in the C3 meteorite Allende. The inferred iodine concentrations increased from pentlandite to melilite, but vary widely from one grain to another, indicating that the iodine resides in a minor phase which is included 'spottily' in the bulk phases. It is likely that the detectability for excess Xe achieved here could be improved; about 23,000 of fissiogenic Xe-132 was detected in the largest melelite sample analyzed, but it cannot be determined from this study whether the PU-244 is 'spotty' like I-129 or is uniformly distributed in the melilite.
Reynolds, J. H.↗
High sensitivity pulse-counting mass spectrometer system for noble gas analysis
A pulse-counting mass spectrometer is described which is comprised of a new ion source of cylindrical geometry, with exceptional optical properties (the Baur source), a dual focal plane externally adjustable collector slits, and a 17-stage Allen-type electron multiplier, all housed in a metal 21 cm radius, 90 deg magnetic sector flight tube. Mass discrimination of the instrument is less than 1 per mil per mass unit; the optical transmission is more than 90%; the source sensitivity (Faraday collection) is 4 ma/torr at 250 micron emission; and the abundance sensitivity is 30,000.
Hohenberg, C. M.↗
Selectivity enhancement in photoacoustic gas analysis via phase-sensitive detection at high modulation frequency
A method for detecting a target fluid in a fluid sample comprising a first fluid and the target fluid using photoacoustic spectroscopy (PAS), comprises a) providing a light source configured to introduce an optical signal having at least one wavelength into the fluid sample; b) modulating the optical signal at a desired modulation frequency such that the optical signal generates an acoustic signal in the fluid sample; c) measuring the acoustic signal in a resonant acoustic detector; and d) using the phase of the acoustic signal to detect the presence of the target fluid.
Kosterev, Anatoliy↗
Low Power Consumption Laser for Next Generation Miniature Optical Spectrometers for Trace Gas Analysis
The air quality of any manned spacecraft needs to be continuously monitored in order to safeguard the health of the crew. Air quality monitoring grows in importance as mission duration increases. Due to the small size, low power draw, and performance reliability, semiconductor laser-based instruments are viable candidates for this purpose. Achieving a minimum instrument size requires lasers with emission wavelength coinciding with the absorption of the fundamental absorption lines of the target gases, which are mostly in the 3.0-5.0 mu m wavelength range. In this paper we report on our progress developing high wall plug efficiency type-I quantum-well GaSb-based diode lasers operating at room temperatures in the spectral region near 3.0-3.5 mu m and quantum cascade (QC) lasers in the 4.0-5.0 mu m range. These lasers will enable the development of miniature, low-power laser spectrometers for environmental monitoring of the spacecraft
distributed feedback laser (DFB↗
Low Power Consumption Lasers for Miniature Optical Spectrometers for Trace Gas Analysis
No abstract available
spectrometers↗
Low Power Consumption Lasers for Miniature Optical Spectrometers for Trace Gas Analysis
The air quality of any manned spacecraft needs to be continuously monitored in order to safeguard the health of the crew. Air quality monitoring grows in importance as mission duration increases. Due to the small size, low power draw, and performance reliability, semiconductor laser-based instruments are viable candidates for this purpose. Achieving a minimum instrument size requires lasers with emission wavelength coinciding with the absorption of the fundamental absorption lines of the target gases, which are mostly in the 3.0-5.0 micron wavelength range. In this paper we report on our progress developing high wall plug efficiency type-I quantum-well GaSb-based diode lasers operating at room temperatures in the spectral region near 3.0-3.5 micron and quantum cascade (QC) lasers in the 4.0-5.0 micron range. These lasers will enable the development of miniature, low-power laser spectrometers for environmental monitoring of the spacecraft.
Distributed Feedback (DFB) Diode Lasers↗
Low Power Consumption Lasers for Next Generation Miniature Optical Spectrometers for Major Constituent and Trace Gas Analysis
No abstract available
Forouhar, Siamak↗
Low Power Consumption Lasers for Next Generation Miniature Optical Spectrometers for Major Constituent and Trace Gas Analysis
The air quality of any manned spacecraft needs to be continuously monitored in order to safeguard the health of the crew. Air quality monitoring grows in importance as mission duration increases. Due to the small size, low power draw, and performance reliability, semiconductor laser-based instruments are viable candidates for this purpose. The minimum instrument size requires lasers with emission wavelength coinciding with the absorption of the fundamental frequency of the target gases which are mostly in the 3.0-5.0 micrometers wavelength range. In this paper we report on our progress developing high wall plug efficiency type-I quantum-well GaSb-based diode lasers operating at room temperatures in the spectral region near 3.0-3.5 micrometers and quantum cascade (QC) lasers in the 4.0-5.0 micrometers range. These lasers will enable the development of miniature, low-power laser spectrometers for environmental monitoring of the spacecraft.
semiconductor lasers↗
Thermal and Evolved Gas Analysis of Mars Analog Paleosols
Decades of space exploration have shown that three to four billion-year old surface environments on Mars may have been habitable. Ancient surface environments which resemble paleosols (buried sedimentary deposits which formed from subaerial weathering) on Mars have recently been named a high-priority target for biosignature investigation and Mars Sample Return because paleosol mineralogy records valuable information about past climates, and because Archean (~2.6 Ga) paleosols from Earth preserve some of the oldest biosignatures of life on land. However, there has been little effort to characterize terrestrial paleosols with Mars-like mineralogy using instruments analogous to those on current and future missions to Mars, which is imperative for understanding if putative paleosols on Mars should be targeted for future exploration. The objectives of this study were to perform the first comprehensive analysis of Mars-analog paleosols with Mars flight-analog instrumentation and to determine if organic carbon in these paleosols is detectable in the presence of a perchlorate salt.
A. P. Broz↗
Introduction to Residual Gas Analysis (RGA)
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Outgassing thermal vacuum QCM RGA↗