多通道门选通纳秒分幅相机

Multi-channel nano-second framing camera with gate selection

采用光学分幅技术和多通道门选通法研制了纳秒分幅相机。首次应用八棱锥将图像分为8幅,每幅图像有相等的光学能量并包含与原图像相同的光学信息,每个通道使用独立的带门选通的像增强器和CCD相机,自行开发的近贴门选通像增强器用于增强弱光图像。相机系统可一次获得8幅图像,分幅速率达到1×108frame/s,最短曝光时间和时间间隔为3ns和10ns并分别可调,可记录持续时间为百纳秒到几十微秒的发光现象,动态空间分辨率达到15lp/mm。该相机已成功应用于电脉冲、等离子发光等现象的试验并获得了有意义的数据,可满足高速摄影机等设备具有高分幅速率,短曝光时间和适当间隔以及在曝光时间内固定时刻记录超快现象过程的要求。

The ultra high-speed photography is an essential diagnostic tool in research on ultra last process. The image diagnostic instrument is required to obtain high speed frarring images in high framing rate, short exposure time and suitable gap,and recording ultra fast process in fix time. A nanosecond framing camera was developed using optical framing technique and gate selection methord in this paper. An image was split into eight using octagonal pyramid mirror in the space and each split image has equal optical energy and original information. A nearly-pasted image intensifier with gate selection was also developed to enhance the weak optical image. Each channel uses an independent im- age intensifier with gate selection and an CCD camera. This system could capture eight images in sequence at the shortest exposure time and gap of 3 ns and 10 ns, and the exposure time and gap could be adjusted separately. Experimental results show that the framing speed achieves 1 × 10^8 frame/s and dynamic spatial resolution of 15 lp/mm. Several experiments, such as beam diagnose of electron pulse, plasma luminescence process have adopted this camera and many useful results are obtained.