巻号一覧
43 巻, 9 号
「パワーレーザーの宇宙航空応用」特集号
選択された号の論文の11件中1～11を表示しています
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「パワーレーザーの宇宙航空応用」特集号
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レーザー解説
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佐宗 章弘2015 年 43 巻 9 号 p. 586-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスWe have edited this special issue in order to update the status of aerospace applications of power laser technology and related research and developments. In particular, the application of laser pulse ablation to space debris deorbiting seems to be a necessary and promising application to contribute to sustainable Insert “of” environment.抄録全体を表示PDF形式でダウンロード (154K) -
和田 智之, 小川 貴代2015 年 43 巻 9 号 p. 587-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスLaser is one of strong tools for remote sensing in space. Previous works and future planes with space bone Lidar are reviewed. Development of laser technology is key issues for these applications. Thermal vacuum experiment of the space laser was introduced. Our laser was stable in the temperature region from -40 degree to 60 degree in the vacuum. As a future plan, we introduce JEM-EUSO project for detection of extreme high energy particle over 1020 eV.抄録全体を表示PDF形式でダウンロード (2145K) -
加藤 明2015 年 43 巻 9 号 p. 592-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスThe orbital environment has so deteriorated to such a serious extent that space activities must comply with the world debris mitigation guidelines, the UN Debris Mitigation Guidelines, for example. However, the recent intentional destruction of spacecraft, the accidental break-up of spent rocket bodies, and orbital collisions among satellites are accelerating the deterioration. Now, world experts are seeking active debris removal that will be essential in the near future to ensure the sustainability of space activities. This article describes the recent debris environment, the risk of debris impact, and the necessity of debris removal.抄録全体を表示PDF形式でダウンロード (1827K) -
内田 成明2015 年 43 巻 9 号 p. 599-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスIn low earth orbits, orbital debris, which has begun to cause significant problems for human space activities for more than three decades, is divided into two size groups: larger than and smaller than 10 cm. Even though the former is the main source of new debris, the latter can cause catastrophic damage to spacecrafts. Due to their great number, small debris poses an immediate threat and requires urgent attention. Since there is a lack of information about the orbits of debris, the author proposed space debris mitigation scheme using a spaceborne laser system with auto-laser-targeting capability based on a nonlinear optical phenomenon called optical phase conjugation. We discuss the requirements of a laser unit and telescope system based on the geometrical characteristics of debris collisions with satellites.抄録全体を表示PDF形式でダウンロード (933K) -
堀澤 秀之2015 年 43 巻 9 号 p. 606-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスThis is a review of laser propulsion for space propulsion applications by today including a range of specific impulses of 200 ~ 5000 s, momentum coupling coefficients of 0.1~10 kN/MW, and thrust efficiencies of over 100% due to exothermic effects of high-energy propellants, such as GAP. Formulation of momentum generation and some examples of propulsion systems were introduced.抄録全体を表示PDF形式でダウンロード (1225K) -
佐宗 章弘, 戎崎 俊一2015 年 43 巻 9 号 p. 611-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスPower laser can be utilized in various aerospace applications, for example, aerodynamic performance modifi cation for high-speed fl ight, and laser propulsion in which remote energy delivery leads to large payload capability and even a unique method of remotely nudging space debris. Related research topics are presented in this article.抄録全体を表示PDF形式でダウンロード (1964K) -
藤田 和久2015 年 43 巻 9 号 p. 616-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスI review Laser Space Solar Power System (L-SSPS) researches for wireless power transmission using laser technology. I describe the L-SSPS design concept and such key technologies as solar collectors, solar-pumped laser systems, laser transmission, and laser photovoltaic. Among recent activities, I present the estimates of laser transmission through an atmosphere using a mesoscale meteorological model as a new trend in the L-SSPS research fi eld.抄録全体を表示PDF形式でダウンロード (1264K) -
葛山 浩, 小紫 公也2015 年 43 巻 9 号 p. 621-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスAn air-breathing pulse-laser powered orbital launcher has been proposed as an alternative to conventional chemical launch systems. This paper introduces the concept of the launching system, and discusses its feasibility through launch trajectory analyses. Results show that the launcher can transfer 0.084 kg of payload per 1 MW beam power to a geosynchronous earth orbit. The cost becomes a quarter of existing systems if one can divide a single launch into 24,000 multiple launches using a 5 GW-class laser. Moreover, a suitable laser type and required technology for the launcher are discussed.抄録全体を表示PDF形式でダウンロード (1410K)
レーザーオリジナル
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川上 言美, 岡村 秀樹, 内田 成明, 小紫 公也2015 年 43 巻 9 号 p. 628-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスThe growing amount of small space debris poses a serious threat to space development. One proposed solution to this problem is the removal of small space debris using laser ablation. For this method, the automatic targeting and pointing capability of phase conjugate light (PCL) can be used. In this study, a fl ashlamp-pumped Nd:YAG rod in a laser oscillator is used as the phase conjugator. An investigation of the dependence of PCL energy on pumping energy reveals a maximum PCL output of 20 mJ. Moreover, wavefront correction is demonstrated using a dynamic phase object. Finally, PCL generation is confi rmed using an aluminum target.抄録全体を表示PDF形式でダウンロード (715K) -
明石 直, 大井川 佑治, 細川 大志, 堀澤 秀之2015 年 43 巻 9 号 p. 633-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスTo estimate the thrust performance of a short-pulse (ns-pulse) laser assisted pulsed plasma thruster (ns- LAPPT), impulse bit measurement and mass shot measurement were conducted, and results were compared to those of μs-LAPPTs. From the results, impulse bits and mass shots increased with charge energy. Significantly higher impulse bits were obtained with ns-LAPPTs than μs-LAPPTs. The maximum impulse bit and mass shot for a charge energy of 3.0 J were 25 μNs and 0.7 μg/pulse, respectively. From the results, the specific impulse and thrust efficiency were 3,800 s and 15 %, respectively.抄録全体を表示PDF形式でダウンロード (1091K)
一般論文
レーザーオリジナル
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三島 陽介, 羽原 英明, Prashant K. SINGH, Amitava ADAK, Gourab CHATTERJEE, Amit ...2015 年 43 巻 9 号 p. 638-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスHigh-energy electrons are generated when a high intensity(1019 W/m2), 30-femtosecond laser pulse irradiates a grating target at the resonant condition of surface plasmon excitation. The number of observed electrons for the grating target is 16 times higher than that for a plane foil target. A finite difference time domain simulation demonstrates a sharp dip of refl ectivity by surface plasmon excitation at this condition, and a particle-in-cell simulation well reproduces the trend of electron energy spectra measured in the experiment. The acceleration mechanism of the fast electrons can be explained by J × B acceleration, based on the agreement of the measured slope temperatures with those provided by numerical scaling laws.抄録全体を表示PDF形式でダウンロード (460K)
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