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Yue H.,Dalian University of Technology | Wu A.,Dalian University of Technology | Feng Y.,Lanzhou Institute of Physics | Zhang X.,Dalian University of Technology | Li T.,Dalian University of Technology
Thin Solid Films | Year: 2011

Al-doped ZnO thin films were deposited by radio frequency magnetron sputtering using a ZnO target with 2 wt.% Al2O3. The structures and properties of the films were characterized by the thin film X-ray diffraction, high resolution transmission electron microscopy, Hall system and ultraviolet/visible/near-infrared spectrophotometer. The Al-doped ZnO film with high crystalline quality and good properties was obtained at the sputtering power of 100 W, working pressure of 0.3 Pa and substrate temperature of 250 °C. The results of further structure analysis show that the interplanar spacings d are enlarged in other directions besides the direction perpendicular to the substrate. Apart from the film stress, the doping concentration and the doping site of Al play an important role in the variation of lattice parameters. When the doping concentration of Al is more than 1.5 wt.%, part of Al atoms are incorporated in the interstitial site, which leads to the increase of lattice parameters. This viewpoint is also proved by the first principle calculations. © 2011 Elsevier B.V. All rights reserved.


Zhang T.,Lanzhou Institute of Physics
Proceedings of the International Astronautical Congress, IAC | Year: 2013

LIPS-200 ion electric propulsion system has been developed by Lanzhou institute of physics (LIP) since 1990s and its first flight test was conducted on SJ-9A satellite launched on October 10, 2012. After the checkout and activation in orbit were finished, the first firing operation has been implemented successfully on November 7, 2012. The first-phase test plan was completed until December 9, 2012, and the second-phase test plan was implemented continuously. In this paper, the initial test results of the LIPS-200 on SJ-9A satellite in the first phase are presented in details. Copyright ©2013 by the International Astronautical Federation.


Tianping Z.,Lanzhou Institute of Physics
Proceedings of the International Astronautical Congress, IAC | Year: 2013

LIPS-200 ion electric propulsion system for the NSSK mission on DFH-3B satellite platform has been developing by Lanzhou Institute of Physics since 2010. The LIPS-200 system is composed of a system control unit, 4 ion thrusters, 2 power processing units(PPU), and a xenon storage and feed subsystem including 2 xenon tanks, a pressure regulator unit and 4 flow controllers. In this paper, the development status of the LIPS-200 ion electric propulsion system is summarized and the next development program is presented. Copyright © 2013 by the International Astronautical Federation. All rights reserved.


Xue D.-T.,Lanzhou Institute of Physics
Yuhang Xuebao/Journal of Astronautics | Year: 2011

The electrostatically suspended accelerometers are one of the main payloads in the gravity field measurement satellite. The accelerometer sensor heads (flight model) must be calibrated on-ground with gravity inclination before and after environmental test. As different coupling mechanism between sensitive axes from the conventional accelerometers, the model equation used during calibrating the accelerometers is differential. As the misalignment angles are extremely bigger than the gravitational tilt angle on-ground in the accelerometer range, the parameters each of the model equation could not be verified by using the conventional static calibration methods. For approximately estimating the scale factor and verifying consistency of the model equation parameters each of the twin accelerometers with the dynamic calibration method and obtaining the second order non-linearity coefficient with the electrical analogue method on the dedicated pendulum bench, one must adopt some technical artifices to make the third order non-linearity coefficient ignored. The techniques for preventing the spectrum leakage and depressing the magnitude of noise disturbance in the amplitude spectrum are put forward. The concrete executive plan and the effect of the electrical analogue method are unfurled by demonstration.


Xue D.-T.,Lanzhou Institute of Physics
Yuhang Xuebao/Journal of Astronautics | Year: 2011

In this paper, the specification items of the accelerometers are reduced to five kinds, of which the relation to the requirements is explained. It is accentuated that the sample rate of 10 SPS and the corresponding 3Hz bandwidth of the closed loop transfer function are indispensable. It is pointed out that the laboratory calibration shall be disturbed by the ambient vibration noise, so usual calibration methods are not applicable without exception, and main difficulty of the static calibration is accurately determining misalignment angles; the scale factors could be approximately estimated and the consistency of various parameters of the model equation for the twain accelerometers could be observed through the dynamic calibration with a dedicated pendulum bench; in order to implement various performance tests for accelerometers in the dedicated pendulum bench, the proof mass of the accelerometer is required to be levitated under the ground gravity; the function of the free fall test is limited and the test is not quantitative assessment test for the performance index of accelerometers; the analytic confirmation method is adopted to verify the noise of accelerometers before launch, and in order to reduce the noise, one must depend on the exhaustive theoretic analysis and experimental validation, find out the various influence factors and degrees one by one, take forceful means and faithfully improve the insufficiencies.

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