紫外单光子成像系统的研究

搭建了紫外单光子成像系统，详细介绍了该系统的组成、工作原理和分辨率性能测试.由汞灯发出的紫外光经过大气散射、多块减光片得到了紫外单光子流.单光子直接打在微通道板上，微通道板产生的倍增电子由楔条形阳极收集，电荷灵敏前置放大器将阳极输出的电荷信号转变为电压信号，主放大器对前放信号进行滤波整形.利用高速数据采集卡连续采集主放大器的输出波形，通过软件对采集波形进行处理，采用图像处理技术得到了紫外单光子10min的计数图像，并对图像进行了畸变校正.此外，通过自己设计的分辨率板，测得该系统的分辨率可达150μm.该系统在极微弱光探测成像，生物发光，空间环境探测等方面具有广泛应用. 关键词： 单光子计数成像 阳极探测器 楔条形阳极 分辨率

Study of ultraviolet single photon imaging system

An ultraviolet single photon imaging system was built and its structure,working principle and spatial resolution are reported. Ultraviolet single photon can be obtained by ultraviolet lighr emitted by a mercury lamp and is attenuated by filters. Single photon irradiates on the microchannel plate directly, producing the multiplied electrons. The multiplied electrons are collected by wedge and strip anode. The charge signal coming from the anode is transformed to voltage signal by a charge_sensitive preamplifier. Then the voltage signal is filtered and shaped by a main amplifier. The output wave signal is collected by high speed data collection card continuously and processed with software. Finally, a ten-minute counting image of ultraviolet single photon is acquired and its revised image is obtained by image processing. The spatial resolution of this system can reach 150 micrometers as tested with the self-designed resolution board. The system can be used widely for very faint luminescence detecting/imaging, biological luminescence and space environment weak light detection.