In order to analyze the loss of the free-space optical receiver caused by the vibration, we set up the coordinate systems on both the receiving lens surface and the receiving fiber surface, respectively. Then, with Gauss optics theory, the coupling efficiency equation is obtained. And the solution is calculated with MATLAB® software. To lower the impact of the vibration, the directional tapered communication fiber receiver is proposed. In the next step, the sample was produced and two experiments were done. The first experiment shows that the coupling efficiency of the receiver is higher than that of the traditional one. The second experiment shows the bit error rate of the new receiver is lower. Both of the experiments show the new receiver could improve the receiving system’s tolerance with the vibration.
Electron bombardment of semiconductor gain as the main characteristics of electronic bombardment devices affect the overall performance of the device. According to weak signal detection theory, developed a set of multiplying electron gain test system including pre-amplifier circuit and FPGA-based high-speed signal acquisition system. The tinned semiconductor sample was tested experimentally, for the relationship between gain performance and incident electron energy. The experimental with incident electron energy(1500-2000eV) bombardment 65μm of semiconductor sample, results show the multiply electron gain with the increase of the incident electron energy, which will provide theoretical basis and technical support to further manufacture of high performance electron bombarded semiconductor sensors.
With further research on the micro channel-plate(MCP) photoelectric multiple structure of anodized transmission of composite waveguide applied in Free-Space Optical communication, the disadvantage of the models have been found. Firstly, some analyzes about the constraint conditions and performance of the MCP photoelectric multiple structure of composite waveguide have been conducted. Secondly, one device model based on one grid-controlled structure of composite waveguide has been introduced and verifiable experiments have been conducted as a support. Then, the capability of electron transport of two structures is compared by theoretical analyzes. Lastly, the difference between performances of these two structures has been confirmed by verifiable experiments with optical axis positioning by four-quadrant in a vacuum. Results of the experiment have showed that the grid-controlled structure of composite waveguide would be likely to be widely applied in the special detection for its advantages in the future.
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