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Wang L.,Shanghai Institute of Mechanics and Electricity Engineering
Communications in Computer and Information Science | Year: 2012

Negative differential resistance (NDR) devices such as Esaki tunnel diodes (TD), Gunn diodes and resonant tunneling diodes (RTD) are excellent in the realization of high frequency oscillators. However, for tunnel diodes and RTDs, which have large negative differential conductance, the output power tends to be low due to the DC instability, parasitic oscillations and the small area devices employed. In this paper, the maximum device areas for different NDR oscillator topologies, such as waveguide topology and planar topology, were calculated. The result shows that NDR devices for planar oscillators can be much larger (ranging from 3 to 1600 times) than those could be used in waveguide oscillators. A derivation of the maximum RF output power of a parallel RTD oscillator circuit is given and the simulations show that ∼1 mW output power could be achieved at 800 GHz for a single diode oscillator. © 2012 Springer-Verlag. Source


Li Y.H.,Shanghai Institute of Mechanics and Electricity Engineering
IET Conference Publications | Year: 2012

A visible light projector with high frame rate is the premise of realizing the high frame rate for fiber array plane infrared scene transducer. A LCoS reflection visible light projector was discussed in this paper which including LCoS microdisplay, device drive controller, light engine and optical projection system. The key performance of the LCoS reflection visible light projector was tested. The results show that the spatial resolution can be to 512x512, frame rate to 200Hz. This kind of visible light projector can be used in visible to infrared image transducer in HWIL simulation. Source


Li F.,Shanghai Institute of Mechanics and Electricity Engineering | Xu G.,Shanghai Institute of Mechanics and Electricity Engineering
IET Conference Publications | Year: 2012

An ant colony algorithm is presented to detect dim targets against the complex cluttered background in IR image. Firstly the image is decomposed to obtain its SVD value and SVD eigenvector to detect the possible targets. Then, the results of the SVD are used as heuristic information, guiding ant colony with the pheromone together. By the distribution of pheromone on the route that the ants passed updates, and the pheromones on the possible target points increases, the searching routes converge on targets image progressively based on the pheromone updating rule. Finally, we can extract the real targets by final intensity of the legacy of the pheromones. Simulations and experiments show the infrared image can be detected from complicated background compared with the method based on constant weight coefficient filtering and max median filtering. Source


Li Z.,Shanghai Institute of Mechanics and Electricity Engineering | Geng X.,Shanghai Institute of Mechanics and Electricity Engineering | Li F.,Shanghai Institute of Mechanics and Electricity Engineering | Zhang L.,Shanghai Institute of Mechanics and Electricity Engineering
Communications in Computer and Information Science | Year: 2012

On the basis of analysis atmosphere, a new method of calculating the atmosphere transmissibility is introduced. The 3D model of atmospheric transmission of infrared radiation is established for calculating atmospheric transmittance, thermal emission, and single scatter solar radiance along sensor-to-target lines-of-sight (LOS) within a three-dimensionally varying atmosphere. This model analysis the various factors which affect the infrared radiation of atmospheric transmission. The calculation results of atmosphere transmissibility not only consider the atmosphere layering situation along the vertical direction but also atmosphere molecules distribution variable along the horizontal direction. Finally, the simulation images show in this paper. © 2012 Springer-Verlag. Source


Li Q.,Shanghai Institute of Mechanics and Electricity Engineering | Li F.,Shanghai Institute of Mechanics and Electricity Engineering | Lu Z.F.,Shanghai Institute of Mechanics and Electricity Engineering | Li Z.,Shanghai Institute of Mechanics and Electricity Engineering
IET Conference Publications | Year: 2012

Image modeling of complex IR scene is a key technology of infrared imaging simulation. The complex IR scene usually contains target, decoy and background, ect. Since there are a few forms of thermal interaction between these factors, it is very difficult to modeling the complex IR scene fidelity. A new method to obtain the infrared complicated scene in this paper is proposed. The final image composite by any numbers of objects after the objects in scene modeled separately. Example of simulation is that a target throw out decoys while flight through the clouds. The result images show that IR complex scene can be simulated correctly, and the radiation interaction can be displayed clearly. Source

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