Download or read book On Orbit Optical Observations of the ESEX 26kW Ammonia Arcjet written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the course of eight flight firings of the ESEX 26 kW arcjet in March and April, 1999, optical observations from on-board and ground-based sensors were obtained. Images from the on-board still camera indicate that the nozzle temperature distribution is consistent with arcjet heating models and ground observations. Images of the thruster plume at 656 nm confirm predictions that the luminescent plume in the space environment is more diffuse and compact than the plume from a thruster operated in the laboratory at a higher background pressure. Finally, observations using a ground-based telescope reveal a mixed greybody/line emission spectrum over the range 325-675 nm. The spectral features and line ratios are similar to those observed in ground-based measurements.

Download or read book On orbit Optical Observations of the ESEX 26kW Ammonia Arcjet written by L. K. Johnson and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On Orbit Observations of the ESEX 26 KW Ammonia Arcjet written by and published by . This book was released on 1999 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 30 kW ammonia arcjet aboard an Air Force research spacecraft operated successfully. During the course of eight arcjet firings in March and April, 1999, optical observations from on-board and ground-based sensors were obtained. Images from the on-board still camera indicate that the nozzle temperature distribution is consistent with arcjet heating models and ground observations. Images of the thruster plume at 656 nm confirm predictions that the luminescent plume in the space environment is more diffuse and compact than the plume from a thruster operated in the laboratory at higher background pressure. Finally. observations using a ground-based telescope reveal a mixed greybody/line emission spectrum over the range 325-675 nm. The spectral features and line ratios are similar to those observed in ground-based measurements.

Download or read book Observations of the Effect on Spacecraft Function and Communications by the ESEX 26kW Ammonia Arcjet written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests designed to detect the influence of operating the Electric Propulsion Space Experiment (ESEX) 26 kW ammonia arcjet on normal spacecraft communications and operations showed. Two on-board antennas sensitive to the 2, 4, 8, and 12 GHz frequencies detected no increase in signal amplitude that is clearly identifiable with arcjet operation. Analysis of the bit-error rate (BER) tests, a sensitive diagnostic for quantitatively measuring the effect of the arcjet plume on ground/spacecraft round trip communication, revealed no obvious correlation between arcjet operation and the observed increases in bit-error rate. Finally, a series of qualitative observations consistently indicated the benign nature of arcjet operation on normal spacecraft events. For example, commands uplinked without abnormal rejection rate and telemetry downlinked successfully during arcjet operation.

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electromagnetic Effects of the ESEX 26 KW Ammonia Arcjet on Normal Spacecraft Communications and Operations written by and published by . This book was released on 1999 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arcjet thrusters employ an arc discharge to heat propellant which expands through a nozzle to produce thrust. Spacecraft designers who desire to exploit arcjet technology have expressed concern about interference from the electromagnetic environment produced by the thrusters. One of the four major interest areas of the ESEX program was to determine the electromagnetic effect of operating a 30 kW class arcjet upon normal spacecraft communications and operations. To accomplish this task, noise levels were recorded in four frequency bands (2, 4, 8, and 12 GHz) by two onboard antennas. The electromagnetic noise levels observed during all arcjet firings were indistinguishable from those observed during the baseline non-firing periods. Communication bit error rates were also measured during arcjet firings and comparison with non-firing BER data revealed that spacecraft command and control communications were not significantly affected by arcjet firings.

Download or read book 35th AIAA ASME SAE ASEE Joint Propulsion Conference and Exhibit written by and published by . This book was released on 1999 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Overview of the On Orbit Results from the Electric Propulsion Space Experiment ESEX written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The United States Air Force (USAF) Research Laboratory's Electric Propulsion Space Experiment (ESEX) was launched and successfully operated - demonstrating the compatibility and readiness of a 26 kW ammonia arcjet subsystem for satellite applications. ESEX is one of nine experiments on the USAF's Advanced Research and Global Observation Satellite (ARGOS). Data were acquired to characterize the thruster in four different areas: electromagnetic interactions, contamination effects, optical properties of the plume, and thruster system performance. The results demonstrated that the critical system components (including the arcjet, power processor, and propellant system) operated well, and verified the interoperability of high power electric propulsion with generic satellite operations.

Download or read book Aerospace America written by and published by . This book was released on 1999 with total page 702 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 1993 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 30th AIAA ASME SAE ASEE Joint Propulsion Conference written by and published by . This book was released on 1994 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 31st AIAA ASME SAE ASEE Joint Propulsion Conference and Exhibit written by and published by . This book was released on 1995 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 32nd AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit written by and published by . This book was released on 1996 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Jane s Space Directory written by Jane's Information Group and published by . This book was released on 1996-09 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: An annual book providing overviews of the world's space programmes and organizations. Coverage includes past, current and future programmes, details of individual companies and their activities, military space programmes such as SDI, and Soviet activities. Available on CD-ROM and EIS.

Download or read book Karl Fischer Titration written by Eugen Scholz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Karl Fischer titration is used in many different ways following its publication in 1935 and further applications are continually being explored. At the present time we are experiencing another phase of expansion, as shown by the development of new titration equipment and new reagents. KF equipment increasingly incorporates microprocessors which enable the course of a titration to be programmed thus sim plifying the titration. Coulometric titrators allow water determinations in the micro gram-range: the KF titration has become a micro-method. The new pyridine-free re agents make its application significantly more pleasant and open up further possibili ties on account of their accuracy. To make the approach to Karl Fischer titrations easier, we have summarized the present knowledge in this monograph and we have complemented it with our own studies and practical experience. As this book should remain "readable", we have tried to keep the fundamentals to a minimum. Historical developments are only mentioned if they seem to be necessary for understanding the KF reaction. The ap plications are described more fully. Specific details which may interest a particular reader can be found in the original publications cited. The referenced literature is in chronological order as the year of publication may also prove informative. Thus, [6902] for example denotes 69 for 1969 being the year of publication and 02 is a non-recurring progressive number. The referenced litera ture includes summaries which we hope will be of help to find the "right" publica tion easily.

Download or read book Space Stations written by Ernst Messerschmid and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: Construction has begun on the International Space Station (ISS)the largest and most complex extraterrestrial construction project ever. This book on space stations, and the ISS in particular, describes component technologies, systems integration, and the potential utilization of these stations. Co-authored by Messerschmid, one of the first German astronauts, it addresses students and engineers in space technology, but will interest astronomy and space enthusiasts as well.

Download or read book Aerospace Propulsion written by Dennis G. Shepherd and published by Elsevier Publishing Company. This book was released on 1972 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: