He Z.-J.,Key Laboratory of Infrared and Low Temperature Plasma of Anhui Province |
Ma L.-F.,Academy of Army Officers |
Wang J.-C.,Key Laboratory of Infrared and Low Temperature Plasma of Anhui Province |
Zhao D.-P.,Key Laboratory of Infrared and Low Temperature Plasma of Anhui Province |
Wang Q.-C.,Key Laboratory of Infrared and Low Temperature Plasma of Anhui Province
Journal of Applied Optics | Year: 2014
In order to acquire the polarization information of target and background and improve the accuracy of detection for ground target, a spectral polarization imaging detection system was proposed, which could modulate the polarization state through revolving the polarizer and select spectra through revolving the filter so as to achieve spectral polarization imaging detection. An experiment was designed to validate the result of the polarization degree acquired from the system. The result shows that the system can reach the detection accuracy up to 4%. Additional, the detection experiment about the camouflage coating target which was under typical woodland background was conducted by the system. The result of image processing indicates that the target is prominent in the background, the polarization's difference is up to 0.292 between target and soil, while 0.283 between target and grass.
Chen Z.,China Institute of Technology |
Lin Z.,China Institute of Technology |
Shi J.,China Institute of Technology |
Ma L.,Academy of Army Officers
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2015
A novel technique was developed to diagnose the electron density and its distribution in the low temperature plasma with emission spectroscopy demarcated by Langmuir probe. Theoretically speaking, for a weakly varying electron tempe rature, the plasma emission intensity could be approximated to depend linearly on the electron density, which can be diagnosed with Langmuir probe. Sine the spa tial distribution of the plasma emission intensity can also be measured, the lin ear dependence of the electron density on the emission intensity can be derived by data processing. In the case of the surface wave plasma source, the linear de pendence of the electron density on the emission intensity was evaluated in the newly-developed technique. The calculated and measured results of the electron density and its spatial distribution were found to be in fairly good agreement. We suggest that the new method be of some technological interest in diagnosis of other low temperature plasma. ©, 2015, Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology. All right reserved.
Chen Z.-S.,China Institute of Technology |
Ma L.-F.,Academy of Army Officers |
Wang J.-C.,China Institute of Technology
International Journal of Antennas and Propagation | Year: 2015
The distribution of the electron density along a plasma antenna can influence the antenna's performance. But little has been done in this regard in former studies. In this paper, a model of a practical plasma antenna with an inhomogeneous distribution of electron density is founded according to the transmission-line equivalent theory of a metal monopole, from which the current distribution and the radiation pattern of a plasma antenna with appropriate parameters are calculated. The results show that the electrical current distribution, the maximum radiation direction, and the beamwidth of a plasma antenna vary with electron density distributions. To validate the model, the plasma antenna with the same parameters is also simulated based on electromagnetic software HFSS. It is found that the results from the two ways are almost consistent. © 2015 Zong-sheng Chen et al.