Dr. Xianxiang Chen Profile

Dr. Xianxiang Chen

at Institute of Electronics

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Proceedings Article | 16 August 2011 Paper

Double-probe spaceborne electric field sensor for earthquake precursor detection in ionosphere

Xian-xiang Chen, Ren Ren, Ji Yang, Dong-min Fang, Shan-hong Xia

Proceedings Volume 8196, 81960I (2011) https://doi.org/10.1117/12.899582

KEYWORDS: Satellites, Plasma, Signal processing, Electric field sensors, Sensors, Earthquakes, Signal detection, Space operations, Plasma systems, Resistors

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Electric field abnormal is one of the most important earthquake precursor phenomena in the ionosphere. The ionosphere electric field abnormal has the characteristic of wide frequency band (frequency range from DC to several MHz), which is suitable to be detected by the double-probe spaceborne electric field sensor (DSEFS). The DSEFS is composed of four sensing probes, four booms outside of the satellite and one signal acquisition and processing system (SAPS) inside the satellite. The four booms are used to set the four probes away form the satellite platform and form a tetrahedron in the space. The plasma potential around the probe is coupled to the probe though equivalent resistor and capacitor in parallel, which is the result of the probe charging. The plasma potential is acquired with a preamplifier with very high input impedance in the probe. In order to insure the detection precision, the value of equivalent resistor can be adjusted with a bias current provided by the SAPS. The probe potential is further acquired and processed by the SAPS to form three dimensional orthogonal electric field detection results. In order to insure the detection precision of the plasma electric field, the Spacecraft and Plasma Interaction System (SPIS) simulation software was used to simulate the interaction between satellite, sensor probes, booms and surrounding plasma. There are two major contributions in the paper. Firstly the layout of the sensor probes outside the satellite was optimized to reduce the influence of wake effect. Secondly, the fixing mode between the boom and satellite was optimized to reduce the influence of satellite potential change on the probe charging characteristic.

Proceedings Article | 16 August 2011 Paper

Numerical simulation of the influence of cylindric electrode length on double-probe spaceborne electric field sensor

Xian-xiang Chen, Ji Yang, Ren Ren, Dong-min Fang, Shan-hong Xia

Proceedings Volume 8196, 81960J (2011) https://doi.org/10.1117/12.899583

KEYWORDS: Optical spheres, Satellites, Plasma, Electrodes, Electric field sensors, Computer simulations, Numerical simulations, Earthquakes, Signal processing, Plasma systems

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Double-probe spaceborne electric field sensor (DSEFS) was used to detect the ionospheric electric field abnormal of earthquake precursor. The DSEFS is comprised of four probes and four booms outside the satellite and one signal acquisition and processing system inside the satellite. Four cylindric electrodes called C2 of the probes were used to connect the booms and the probes. The length of C2 is one of the most important geometric parameter need to be optimized to ensure the detecting precision of DSEFS. In order to understand the operation of the electric field probes and optimize its performance, Spacecraft Plasma Interaction System (SPIS) software and DEMETER detected data were used to study the influence of C2 length on the DSEFS detection precision. The simulation results showed that when the C2 length is bigger than 2 Debye lengths, the influence of the boom potential had almost no disturbance on the DSEFS probes. In the case of short C2 length, when the boom had a potential which is positive with respect to the probes, the local electric field between the boom and the probe was the dominant factor, the probe collected currents monotonously increased with the increasing of C₂ length. When the boom has a negative potential with respect to the probe, the probe collected current did not monotonously increased with the increasing of C2 length, when the length of C2 is relatively short (less than 20cm), the effect of boom sheath was the dominant factor, the probe collected current increased with the increasing of C2 length; when the length of C2 is larger than 20cm, the local electric field became the dominant factor, the probed colleted current decreased with the increasing of C2 length. The computer simulation result provided good guidance on optimization design of the C2 length of DSEFS.

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