Mir-based measurements of the ultraviolet emissions from rocket exhaust plume interactions with the atmosphere at 380-km altitude

Karabadzhak, G. F.; Plastinin, Yu. A.; Szhenov, E.; Afanasjev, A.; Drakes, J. A.; McGregor, W. K.; Bradley, Donald V.; Teslenko, V. P.; Shvets, N. I.; Volkov, O. N.; Kukushkin, V. K.; Gimelshein, S. F.; Fliflet, Deborah Levin

doi:10.2514/6.2000-105

Cited by 11 publications

(15 citation statements)

References 5 publications

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“…Figure 27 provides the plume glow profiles derived from the images in Figure 26. Distinctive feature of the new profiles in comparison with those taken before from the "Progress" main engine 5 is that ACS plume profiles look wider in peripheral regions. Also, a small bend persists in every profile about one degree away from the plume center.…”

Section: The Glow Imagesmentioning

confidence: 99%

“…84 Combustion chamber pressure, P -6.2⋅10 5 Pa Combustion chamber temperature, T -2680 K Nozzle throat radius, R th -0.0061 m Nozzle exit radius, R ex -0.04375 m For more accurate 2-D modeling the motor nozzle shape is required. A conventional Laval nozzle contour may serve as a good prototype for the real motor's one.…”

Section: Motorsmentioning

confidence: 99%

“…Also, studying of the Shuttle UV-glow has been limited by the NH(A→X) emission, whereas "Mir" experiments were aimed mainly to understanding of the nature and specific features of the OH(A→X) emission i . Analysis of the plume images obtained on board of the "Mir" station since 1993 resulted in an idea that OH(A→X) emissions must be one of the main contributor to the UV-glow radiation intensity measured by the imager 2,3,4,5 . Strong NH(A→X) radiation observed in the Shuttle plume 1 was supposed to be filtered off by the imager.…”

Section: Introductionmentioning

confidence: 99%

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Studying of Atomic and Molecular Interaction Processes in Rarified Hypervelocity Expanding Flows by Methods of Emissive Spectroscopy

Karabadzhak¹

2004

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Section: The Glow Imagesmentioning

confidence: 99%

Section: Motorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studying of Atomic and Molecular Interaction Processes in Rarified Hypervelocity Expanding Flows by Methods of Emissive Spectroscopy

Karabadzhak¹

2004

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“…The most commonly used UV imaging detectors are image intensifiers combined with narrow-band filters transparent in the 240 to 280 nm band [3]. At this wavelength range, called "solar blind", the daytime detection of UV light occurs with practically no background of solar radiation, which is absorbed by the ozone layer in the upper atmosphere and does not reach the Earth surface.…”

Section: Introductionmentioning

confidence: 99%

A Novel UV Photon Detector with Resistive Electrodes

Bidault

Fonte

Francke

et al. 2006

Nuclear Physics B - Proceedings Supplements

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In this study we present first results from a new detector of UV photons: a thick gaseous electron multiplier (GEM) with resistive electrodes, combined with CsI or CsTe/CsI photocathodes.The hole-type structure considerably suppresses the photon and ion feedback, whereas the resistive electrodes protect the detector and the readout electronics from damage by any eventual discharges.This device reaches higher gains than a previously developed photosensitive RPC and could be used not only for the imaging of UV sources, flames or Cherenkov light, for example, but also for the detection of X-rays and charged particles.

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“…As it was explained above, at the wavelength range of 260-280 nm daytime detection of UV signals emitted from the fire or the electrical discharges UV Only Image occurs with practically no background of solar radiation. Today the existing UV imaging detectors are mostly MCPsbased image intensifiers combined with narrow band filters transparent in the wavelength interval of 260-280 nm [8]. The sensitivity of these types of detectors is limited by the low transmission of the filters and high thermoelectronic noise level (typically 10 3 Hz per cm 2 of the photocathode surface).…”

Section: Introductionmentioning

confidence: 99%

Advanced Gaseous Photodetectors for Hyperspectroscopy and Other Applications

Rodionov

Bidault

Crotty

et al.

IEEE Nuclear Science Symposium Conference Record, 2005

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Abstract--Hyperspectroscopy is a new method of surface image taking, providing simultaneously high position and spectral resolutions which allow one to make some conclusions about chemical compositions of the surfaces. We are now studying applications of the hyperspctroscopic technique to be used for medicine. This may allow one to develop early diagnostics of some illnesses, as for example, skin cancer. For image taking advanced MCPs are currently used, sensitive in the spectral interval of 450-850 nm. One of the aims of this work is to extend the hyperspectrocpic method to the UV region of spectra: 185-280 nm. For this we have developed and successfully tested innovative 1D and 2D UV sealed photosensitive gaseous detectors with resistive electrodes. These detectors are superior MCPs due to the very low rate of noise pulses and thus due to the high signal to noise ratio. Other important features of these detectors are that they have excellent position resolutions -30 µm in digital form, are vibration stable and are spark protected. The first results from the application of these detectors for spectroscopy, hyperspectroscopy and the flame detection are presented.

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Mir-based measurements of the ultraviolet emissions from rocket exhaust plume interactions with the atmosphere at 380-km altitude

Cited by 11 publications

References 5 publications

Studying of Atomic and Molecular Interaction Processes in Rarified Hypervelocity Expanding Flows by Methods of Emissive Spectroscopy

Studying of Atomic and Molecular Interaction Processes in Rarified Hypervelocity Expanding Flows by Methods of Emissive Spectroscopy

A Novel UV Photon Detector with Resistive Electrodes

Advanced Gaseous Photodetectors for Hyperspectroscopy and Other Applications

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