المؤلفون: Kroier, Andreas, Cho, Mengu, Leitgeb, Erich, Okumura, Teppei, Toyoda, Kazuhiro

المصدر: 宇宙航空研究開発機構特別資料: 第4回宇宙環境シンポジウム講演論文集 = JAXA Special Publication: Proceedings of the 4th Spacecraft Environment Symposium. :91-94

مصطلحات موضوعية: spacecraft charging, electric discharge, 真空チャンバ, 電子温度, electron temperature, 宇宙機帯電, 持続放電, silicon solar cell, spacecraft power supply, 放電, 太陽電池アレイ, 定電流ダイオード, シリコン太陽電池, current regulating diode, 宇宙機給電, アーク放電, 発光スペクトル, metal halide lamp, aerospace environment, 金属ハライドランプ, 航空宇宙環境, arc discharge, emission spectrum, vacuum chamber, solar array, sustained arc

الوصف: A new method to simulate power generating solar arrays of spacecraft is presented. By combining a multijunction solar array, InGaP-GaAs-Ge, and a Metal Halide Lamp (MHL) secondary arcs were generated. The aim was that the arcs should be comparable to those generated by the currently used methods, which are the Solar Array Simulator (SAS) or a power supply combined with a Current Regulating Diode (CRD) circuit. The results of the experiment showed a successful generation of secondary arcs, especially of temporary sustained arcs. The arc duration is similar for all three simulation methods. The conclusion therefore is that the MHL method can be used in the same way the SAS or CRD method can be used, as it generates the same results.
資料番号: AA0063997012
レポート番号: JAXA-SP-07-030

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=jairo_______::20737a7eb38903da3889ffbef4b53befTest
http://id.nii.ac.jp/1696/00005495Test/

المؤلفون: Cho, Mengu, Ose, Takayuki, Masui, Hirokazu, Toyoda, Kazuhiro

المصدر: 宇宙航空研究開発機構特別資料: 第4回宇宙環境シンポジウム講演論文集 = JAXA Special Publication: Proceedings of the 4th Spacecraft Environment Symposium. :107-112

مصطلحات موضوعية: electric discharge, spacecraft charging, 宇宙機帯電, 磁気嵐, 高エネルギー電子, geostationary Earth orbit, プラズマ相互作用, 静止衛星, 放電, 太陽電池アレイ, high energy electron, アーク放電, 発光スペクトル, aerospace environment, electric field, space plasma, 航空宇宙環境, arc discharge, emission spectrum, 電場, geostationary satellite, Physics::Space Physics, スペースプラズマ, solar array, 静止軌道, plasma interaction, magnetic storm

الوصف: As the power level of geostationary satellites increases, discharge phenomena on solar array are becoming serious threat to safe operation. Arcs on solar array can short-circuit the satellite circuit, decrease the satellite power, and then cause the satellite permanent failure. To prevent the failure caused by charging and arcing, it is necessary to investigate the mechanism of satellite charging and arcing phenomenon. The purpose of this paper is to investigate the occurrence condition of a secondary arc by measuring arc plasma characteristics in ground test. We measured the arc plasma temperature and identified the materials emitted using spectrometer at arbitrary time during arc occurring. We investigated the difference of secondary arcs occurrence condition during secondary arcs. From the spectroscopic measurement results, we found that it was necessary for shifting to the secondary arc that the metallic vapor same as the cathode material was emitted. In case of PA (Permanent Arc) dimension changes, the probability of secondary arc and TSA (Temporary Sustained Arc) occurrence became high. And plasma temperature was not affected by PA dimension. However, the metallic vapor emission of silver was greatly affected. Thus, secondary arc occurrence greatly depends on metallic vapor emission from cathode.
資料番号: AA0063997017
レポート番号: JAXA-SP-07-030

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=jairo_______::593acedd376d3873d201a307bf75ddb9Test
http://id.nii.ac.jp/1696/00005500Test/

المؤلفون: Cho, Mengu, Shikata, Yoshio, Hosoda, Satoshi

المصدر: 宇宙航空研究開発機構特別資料 = JAXA Special Publication: 9th Spacecraft Charging Technology Conference. :286-294

مصطلحات موضوعية: spacecraft charging, 分子スペクトル, 原子スペクトル, 電子温度, electron temperature, electrical conductivity, geosynchronous satellite, 宇宙機帯電, 発光スペクトル, molecular spectrum, 電気伝導度, aerospace environment, 航空宇宙環境, 持続的アーク, atomic spectrum, emission spectrum, 静止衛星, sustained arc

الوصف: Preliminary spectroscopic measurement of electron temperature of arc plasma which strongly related to electrical conductivity was carried out to evaluate the range of proper amount of external capacitor. Using the solar array coupon with the flaw simulating debris impact on the face sheet beside one cell edge, we observed a lot of non-permanent sustained arcs between the cell and the substrate along with the primary arcs. Comparing the spectra of primary arc and non-permanent sustained arc, spectra of non-permanent sustained arc case contained many species compared with the case of primary arc only. Aluminum and ion atoms and silicon ion that included in substrate, electrode and cell were observed. These materials would be vaporized by joule heating of arc plasma. Also, time variations of electron temperature in each discharge mode using relative intensity ratio technique for C(sub 2) Swan system spectra. Primary arc temperatures at peak current was about 5,000-15,000 K and were not much difference whether non-permanent sustained arc occurs or not. The temperatures of the non-permanent sustained arc were up to about 7,000 K and lower than that of primary arc.
資料番号: AA0049206037
レポート番号: JAXA-SP-05-001E

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=jairo_______::7039ec4d4e9de955f9d70b5072d78660Test
http://id.nii.ac.jp/1696/00006346Test/

المؤلفون: Abe, Takashi, Fujita, Kazuhisa, Wakabayashi, Akira, Ijichi, Koichi

المصدر: 宇宙航空研究開発機構研究開発報告: USERS REVカプセルの開発研究および飛行後解析 = JAXA Research and Development Report: Research and Development of USERS REV Capsule and its Post-flight Analysis. :127-135

مصطلحات موضوعية: shock wave, 衝撃波, 空力加熱, Quantitative Biology::Tissues and Organs, 衝撃層, 発光スペクトル, thermal dissociation, reentry capsule, spacecraft reentry, emission spectrum, shock layer, 宇宙機再突入, aerodynamic heating, Physics::Space Physics, USERSミッション, 熱解離, 放射加熱, radiative heating, 再突入カプセル, USERS mission

الوصف: In the READ experiment, the in-fight measurement of the radiation, emanating from the shock layer generated in front of the USERS reentry module during the reentry flight, was successfully performed. The radiation generated at the shock layer was introduced into the onboard spectrometer in the USERS reentry module through the optical fiber. During the flight experiment, the spectrum of the radiation was recorded on the on-board data recorder and was successfully recovered after retrieval of the vehicle. The measured data shows that the spectrum was contaminated by the radiation other than the radiation emanating from the shock layer, and its intensity was stronger than was expected. The spectrum at the altitude of around 90 km shows a strong influence of the ablation gas while the spectrum at the lower altitude shows an influence of the albedo of Earth surface.
資料番号: AA0048710009
レポート番号: JAXA-RR-04-045

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=jairo_______::3b546e00d9d5f7fb433d243f88163fc2Test
http://id.nii.ac.jp/1696/00002319Test/

المؤلفون: Irimajiri, Yoshihisa, Manabe, Takeshi, Ochiai, Satoshi, Yamagami, Takamasa, Saito, Yoshitaka, Kawasaki, Tomomi, Izutsu, Naoki, Namiki, Michiyoshi, Sato, Kaoru, Murata, Isao

المصدر: 宇宙航空研究開発機構研究開発報告: 大気球研究報告 = JAXA Research and Development Report: Research Reports on High Altitude Balloons. :69-76

مصطلحات موضوعية: superconducting receiver, 発光スペクトル, 気球, submillimeter wave, BSMILES, HCl, サブミリ波, stratospheric ozone, emission spectrum, パラボラアンテナ, 成層圏オゾン, balloon, 超伝導受信機, parabolic antenna

الوصف: 2004年9月7日、成層圏中のO3、HClなどを観測することを目的に、気球搭載型超伝導サブミリ波リム放射サウンダ(BSMILES)の第2回目の放球実験が行われた。BSMILESには直径300mmのオフセットパラボラアンテナ、液体ヘリウム冷却の620GHz帯超伝導受信機(SISミクサ)、音響光学型分光計(AOS)、3軸光ファイバジャイロなどが搭載されている。BSMILESはB100型気球により放球され、高度約35kmにおいてオゾン、塩化水素などのスペクトルの観測を行い、観測終了後海上回収された。今回の実験で、システムは回収後再利用可能であることが実証された。
The second flight of BSMILES (Balloon-borne Superconducting Submillimeter-Wave Limb-Emission Sounder) was conducted on September 7, 2004 to observe stratospheric O3, HCl and so on. An offset parabolic antenna with a diameter of 300 mm, a 620 GHz-band SIS (Superconductor-Insulator-Superconductor) mixer cooled by liquid helium, an AOS (Acousto-Optical Spectrometer), and 3-axes fiber-optic gyroscope are carried in BSMILES. The gondola was lifted to an altitude of about 35 km by a balloon of 100,000 cu m in volume. The system operated normally and emission line spectra of O3, HCl etc. were successfully obtained. The experiment concludes that the retrieved system is reusable.
資料番号: AA0048133005
レポート番号: JAXA-RR-04-015

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=jairo_______::1de94c0ba4ba051249516f470a50c5dcTest
http://id.nii.ac.jp/1696/00002372Test/

المؤلفون: Mitsuo, Kazunori, Kurita, Mitsuru, Nakakita, Kazuyuki, Fujii, Keisuke, Watanabe, Shigeya, Ito, Masatake, Katagiri, Shinya, Wada, Yuji

المصدر: 宇宙航空研究開発機構研究開発報告 = JAXA Research and Development Report.

مصطلحات موضوعية: 温度依存性, supersonic transport, bi-luminophore paint, 発光スペクトル, wind tunnel model, pressure dependence, 超音速輸送機, 圧力分布, 風洞試験, pressure sensitive paint, pressure distribution, emission spectrum, 風洞模型, low speed wind tunnel, 圧力測定, 感圧塗料, pressure measurement, 圧力依存性, wind tunnel test, temperature dependence, 低速風洞, 複発光団塗料

الوصف: JAXA総合技術研究本部(Institute of Aerospace Technology: IAT)風洞技術開発センター(Wind Tunnel Technology Center: WINTEC)では、感圧塗料(Pressure-Sensitive Paint: PSP)を利用した表面圧力場計測技術の研究開発を行なっている。PSP計測は従来の電子式センサーによる計測と比較して、安価で手軽に風洞模型全面の圧力場を可視化することができる利点がある。しかし、PSPの発光強度は圧力だけではなく温度にも依存するため、計測精度を高めるためにはPSP温度補正が不可欠である。過去の実験において、IR(InfraRed)カメラを利用した温度補正により計測精度を改善することに成功している。しかし、赤外線(IR)カメラ計測では、周辺温度の写りこみや、マーカーが検出できないなどの問題があり、さらに2種類の異なる計測システムを操作する煩雑さがあるため実用計測システムには不向きである。そこで、上記したIRカメラ併用システムの問題を解消する計測システムとして、PSPに感温色素を混合した複合感圧塗料(複合PSP)の研究を開始した。複合PSPに使用する感温色素は、大阪大学と共同開発をした。複合PSPシステムの技術実証として、JAXA2m×2m低速風洞試験に適用し、複合PSP計測システムの有効性を評価した。その結果、従来の方法(通風直後の無風時画像を用いた計測法)よりも定量的に計測精度を向上させることができ、本システムの温度補正機能が有効であることが実証された。一様流速U(sub ∞)=50m/sにおいて計測精度は約150Paを達成した。また、複合PSPシステムの利点として、IRカメラを併用するシステムよりも使い勝手が良く、実用システムとして有望であることが確認できた。
Pressure-Sensitive Paint (PSP) system is a useful measurement tool for acquiring overall pressure images on an aerodynamic model. However, the luminescent intensity of PSP depends on both pressure and temperature. Thereby, Bi-luminophore PSP (bi-PSP) has been developed in order to correct the error due to temperature dependence of the PSP. The bi-PSP contained pressure- and temperature-sensitive dye. Tetranuclear europium (III) complexes and PdTFPP were used as temperature- and pressure-sensitive dye, respectively. The Eu complex was developed as a temperature sensor of the bi-PSP in cooperation with Osaka University. The luminescence intensity of the Eu complex was highly sensitive to temperature and insensitive to pressure. The bi-PSP was examined using a painted coupon and its characteristics were clarified. As a verification test, pressure distributions on a SuperSonic Transport (SST) model at low-speed flow were acquired by the bi-PSP measurement system. The root-mean-square difference of C(sub P) between PSP and tap data at 50 m/s was approximately 0.1 (150 Pa) at flow speed of 50 m/s, indicating that this bi-PSP system can accurately measure pressure as an IR (InfraRed) camera combined PSP system. Furthermore, this bi-PSP system was more convenient rather than an IR combined PSP system for practical use.
資料番号: AA0063916000
レポート番号: JAXA-RR-07-023

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=jairo_______::d4700130c3259267f74c3327020873abTest
http://id.nii.ac.jp/1696/00002145Test/

المؤلفون: Honma, Kozo, Shingu, Hirokimi, Yamamoto, Hiromichi

المصدر: 宇宙航空研究開発機構研究開発報告 = JAXA Research and Development Report.

مصطلحات موضوعية: airborne equipment, imaging spectropolarimeter, optical property, 液晶同調フィルタ, LCTF, 航空機搭載装置, flight data acquisition system, tunable filter, optical measuring instrument, FDAS, liquid crystal tunable filter, 水質, water quality, 放出スペクトル, remote sensing, 光学フィルタ, emission spectrum, 光学測定装置, リモートセンシング, 飛行実験データ収集システム, optical filter, 同調フィルタ, 画像化分光偏光放射計, 光学特性

الوصف: Polarimetric analysis of sunlight reflected from the Earth's surface is expected to play an important role in future Earth environmental observation, and an imaging spectropolarimeter using a Liquid Crystal Tunable Filter (LCTF) for the visible wavelength band has been developed by the Japan Aerospace Exploration Agency (JAXA) over the past several years for such analysis. In order to bring the optical sensor into practical use, efforts are currently under way to incorporate it in a sensor package for an airborne observation system. This report first presents the concept and architecture of an LCTF imaging spectropolarimeter that senses radiation in the 400-720 nm visible wavelength band. Next, an outline is presented of the onboard observation system using the spectropolarimeter and the LCTF rotation mechanism that is the strongest point of the sensor. Third, the relation between the polarimetric sensor output and reference data on water muddiness is presented from the results of a preliminary trial conducted using muddy-water models, to apply the sensor to water pollution measurement. Fourth, the target areas for the field experiments are shown and the apparatus and procedures for each field experiment using the observation system are described. The areas include rivers, lakes, etc. polluted by the waste water from rice fields. Spectral characteristics of sunlight reflected from the observed spots are then shown by relative spectral radiance as the analyzed results of experimental data. In addition, the results of flight experiments are shown to confirm the ability to measure muddiness of rivers, lakes, etc. from the air. The utility of the optical observation system for airborne remote sensing is clear, based on the results of characteristic analyses of spectral images of the target areas and the spectral radiance of sunlight reflected from the target surfaces. Finally, it is concluded that the way has been paved both for completing the onboard optical observation system using the visible LCTF spectropolarimeter and for determining surface conditions from the properties of the spectral images and the spectral data acquired by the observation system.
資料番号: AA0049793000
レポート番号: JAXA-RR-05-040

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=jairo_______::6b36f3215df6355f2f437e3301f485c3Test
http://id.nii.ac.jp/1696/00002240Test/

المؤلفون: Takahashi, Masahiro, Tanaka, Hiroyuki, Mitsuishi, Masaya, Miyashita, Tokuji, Obata, Makoto, Yano, Shigenobu

المصدر: 宇宙航空研究開発機構特別資料: 第2回学際領域における分子イメージングフォーラム = JAXA Special Publication: Proceedings of the 2nd Interdisciplinary Forum on Molecular Imaging. :35-36

مصطلحات موضوعية: absorption spectrum, 高分子ナノシート, ラングミュア・ブロジェット法, thin film, optical property, 発光スペクトル, tetraphenylporphyrin, Langmuir-Blodgett method, dodecylacrylamide, 発光, DDA/PtTPP, テトラフェニルポルフィリン, oxygen sensor, emission spectrum, 薄膜, ポルフィリン, 吸光, light absorption, light emission, 吸収スペクトル, 酸素センサ, ドデシルアクリルアミド, porphyrin, polymer nanosheets, 光学特性

الوصف: 資料番号: AA0063158010
レポート番号: JAXA-SP-06-017

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=jairo_______::7e786035cdb91e1036cca3488896f216Test
http://id.nii.ac.jp/1696/00005859Test/

المؤلفون: Iijima, Yoshimi, Sakaue, Hirotaka

المصدر: 宇宙航空研究開発機構特別資料: 第2回学際領域における分子イメージングフォーラム = JAXA Special Publication: Proceedings of the 2nd Interdisciplinary Forum on Molecular Imaging. :53-54

مصطلحات موضوعية: 温度依存性, 温度測定, 発光スペクトル, pressure dependence, 発光, functional paint, pressure sensitive paint, 蛍光, paint, emission spectrum, light emission, 機能性塗料, 圧力測定, 感圧塗料, fluorescence, 塗料, PtTFPP, pressure measurement, 圧力依存性, temperature dependence, PTMST, 白金ポルフィリン, temperature measurement

الوصف: 資料番号: AA0063158018
レポート番号: JAXA-SP-06-017

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=jairo_______::a91f25c19295545f196d234171051bd5Test
http://id.nii.ac.jp/1696/00005867Test/

عناروين إضافية: Evolution of the electron yield curves of insulators as a function of impinging electron fluence and energy

مستخلص: Electron emission and concomitant charge accumulation near the surface of insulators is central to understanding spacecraft charging. We present a study of changes in electron emission yields as a result of internal charge build up due to electron dose. Evolution of total, backscattered and secondary yield results over a broad range of incident energies are presented for two representative insulators, Kapton and Al2O3. Reliable yield curves for un-charged insulators are measured and quantifiable changes in yields are observed due to less than 100 fC/sq mm fluence. We find excellent agreement with a phenomenological argument based on insulator charging predicted by the yield curve; this includes a decrease in the rate of change of the yield as incident energies approach the crossover energies and as accumulated internal charge reduces the landing energy to asymptotically approach a steady state surface charge and unity yield. We also find that the exponential decay of yield curves with fluence exhibit an energy dependent decay constant, alpha(E). Finally, we discuss physics based models for this energy dependence. To understand fluence and energy dependence of these charging processes requires knowledge of how charge is deposited within the insulator, the mechanisms for charge trapping and transport within the insulator, and how the profile of trapped charge affects the transport and emission of charges from insulators.
JAXA Special Publication
宇宙航空研究開発機構特別資料

مصطلحات الفهرس: 電子及び電気工学, 宇宙船設計、試験及び性能, electron emission, insulator, emission spectrum, spacecraft charging, aerospace environment, charge accumulation, dielectric, surface potential, charge distribution, 電子放出, 絶縁体, 発光スペクトル, 宇宙機帯電, 航空宇宙環境, 電荷蓄積, 誘電体, 表面電位, 電荷分布, Conference Paper, jaxa, 特別資料, SP