Search

The high speed imaging system of pulse nuclear radiation source consists of pinhole imaging, ultrafast fluorescent materials, electron optical shutter and high speed TV techniques. We have successfully carried out a research into a high speed framing imaging system. This system has been used in both laboratory and underground nuclear test measurements. Spatial and temporal resolutions of the system are better than 0.5 mm and 5 ns respectively. The principle and applications of the system will be described in the paper.

We have made a nanoseconds framing camera with the second generation image intensifiers and have photographed the images of 5 ns framing time with GZ2-2030T image intensifiers. The resolution is 10 Ip/mm. The photographable photo-dynamic region is 100 times. The shutting action is achieved by appling a -800 V gating pulse to the quiscently zero-biased MCP input--output interface. Gating speeds and the quiescently bias influnce on them, maximum photographable photo-dynamic region, the spatial response of the phosphor screen for uniform photo-cathode illumination have characterized. The characterization system,gating and bias­ ing circuit will be presented. INTRODUCTION In high speed phenomena studies, it is often required to photograph instantaneous varia­ tion events in nanoseconds to picaseconds and to study their reacting cases. The mechanical cameras have been powerless already in this case. It became realities, only when the image converter tubes came out and streak various kinds of intensi­ fiers were rapidly developed. We have cooperated with Xian Institute of Optical and Pre­ cision Mechanics to make a camera with 305 2 image converter tubes and to photograph suc- cesfully the images in nonaseconds framing time. We hope to probe into the posibility make the nanoseconds framing camera with the second generation image intensifiers by the aid of the study of their gating properties.