摘要:
近贴聚焦微通道板(MCP)象增强器由于具有高的时间和空间分辨率、宽广的光谱和输入强度动态范围、高的增益以及能记录单次瞬变现象,经常被用作超高速的光快门(光闸)。 微通道板象增强器与控制其快门作用的选通脉冲发生器相结合,便构成具有高的光增益和快速响应的超高速相机。本文比较了对一个典型第二代象增强器(18mm,ITT-F4111型象增强器)进行脉冲控制的三种方式。在此基础上,提出了在象增强器的光阴极进行选通的、能产生大幅度毫微秒脉冲的新颖控制电路。实验表明,用这种控制发生器,相机的曝光时间可达到约2 ns。文中还讨论了控制发生器与象增强器之间的匹配,并提出一个简单而有效的方法,借此可以消除在单次摄影中必须绝对避免的多次曝光现象。
Abstract:
The proximity focused microchannel plate (MCP) image intensifier can be used as a fast optical shutter, due to its high temporal and spatial resolution, large spectral and input intensity range, high gain, and possibility of transient recording of single-shot events.A microchannel plate image intensifier combining with a gating pulse generator constitutes the simplest image converter camera with high gain and fast response. Three different gating manners for a typical second generation converter tube (18 mm,ITT-F4111 type) are compared. A new control circuit for gating the photocathode of the image intensifier is developed, and it generates high amplitude nanosecond pulses. The experimental result shows that a camera exposure time of about 2 ns has been obtained with this gating generator. The matching of the gating generator with the image intensifier is also discussed. a simple and efficient method is presented to eliminate the multi-exposure effect which must be avoided in single-shot photography.
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