用于近貼聚焦微通道板象增強(qiáng)器的新穎控制電路
A NOVEL CONTROL CIRCUIT FOR PROXIMITY FOCUSED MICROCHANNEL PLATE IMAGE INTENSIFIERS
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摘要: 近貼聚焦微通道板(MCP)象增強(qiáng)器由于具有高的時(shí)間和空間分辨率、寬廣的光譜和輸入強(qiáng)度動(dòng)態(tài)范圍、高的增益以及能記錄單次瞬變現(xiàn)象,經(jīng)常被用作超高速的光快門(mén)(光閘)。 微通道板象增強(qiáng)器與控制其快門(mén)作用的選通脈沖發(fā)生器相結(jié)合,便構(gòu)成具有高的光增益和快速響應(yīng)的超高速相機(jī)。本文比較了對(duì)一個(gè)典型第二代象增強(qiáng)器(18mm,ITT-F4111型象增強(qiáng)器)進(jìn)行脈沖控制的三種方式。在此基礎(chǔ)上,提出了在象增強(qiáng)器的光陰極進(jìn)行選通的、能產(chǎn)生大幅度毫微秒脈沖的新穎控制電路。實(shí)驗(yàn)表明,用這種控制發(fā)生器,相機(jī)的曝光時(shí)間可達(dá)到約2 ns。文中還討論了控制發(fā)生器與象增強(qiáng)器之間的匹配,并提出一個(gè)簡(jiǎn)單而有效的方法,借此可以消除在單次攝影中必須絕對(duì)避免的多次曝光現(xiàn)象。
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關(guān)鍵詞:
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. -
F. S. Hallock, SMPTE Journal, 89(1980), 709.[2]Generation. II Proximity Focused Channel Intensifier Tubes, ITT-Druckschrift F-4111.[3]J. L. Moll et al., Proc. IRE, 50(1962), 43.[4]張執(zhí)中,周旋,物理學(xué)報(bào), 30(1981), 84. -
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