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基于楔条形阳极位置灵敏探测器的成像原理和二维傅里叶变换理论,提出了一种建立该类探测器成像模型的方法,进而模拟了探测器的成像效果,仿真了成像的几何非线性,仿真图像与实际图像基本符合。仿真结果表明:在阳极面板半径多出微通道板半径2P(P为阳极周期宽度)和电子云分布半宽度D为1.3P时,该类探测器的成像线性良好;电子云过小即D5P时,电子云超出楔条形阳极工作区域,成像边缘扭曲十分明显。
Based on the imaging principle of wedge-shaped anode position sensitive detector and the theory of two-dimensional Fourier transform, a method to establish the imaging model of this kind of detector is proposed. Then the imaging performance of the detector is simulated and the geometrical non-imaging Linear, the simulation image and the actual image basically in line. The simulation results show that the imaging linearity of this detector is good when the radius of the anode panel is 2P (P is the anode cycle width) and the half width D of the electron cloud is 1.3P. The electron cloud is too small, ie D < P, the wedge-shaped anode samples the cloud due to electron cloud, and there is imaging modulation distortion, which becomes more obvious as D becomes smaller. When the area of electron cloud is too large, ie, D> 5P, the electron cloud goes beyond the wedge Anode working area, the imaging edge distortion is very obvious.