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• W1992850510 abstract "shutter strobe circuit used for image converter tube, double -proximityfocused image intensifier and photomultiplier with microchannel plateGao Jikui, Jing WanyingXian Institute of Optics and Precision Mechanics, Academia SinicaABSTRACTThis paper mainly deals with the present status of the development of nanosecond imageconverter framing cameras and nanosecond double- proximity image intensifier framing camerasin our country, and discusses shutter pulse generator circuits of these cameras.l-z Themixing circuit consisting of avalanche transistor series and pulse thyratron maintainsstrong anti -interference. Its trigger delay time is 14ns, the trigger jitter is about -500ps, the shortest output pulse width is 15ns, its amplitude is 550v and the pulse spacing is15Ons. The circuit consisting of avalanche transistor series and rapid restorer diode has300v of output pulse amplitude, lOns of pulse width and 5Ons of pulse spacing. It is suit-able for a new type of image converter tube which is not strict with pulse waveform. But,the strobe circuit of multichannel double -proximity image intensifier camera can provides2ns of pulse width, 2ns of pulse spacing and -300V of amplitude. When it is used with dou-ble- proximity tube, this kind of strobe circuit can obtain a dynamic resolution of betterthan 4.71p /mm. When it is used for MCP -PMT ns pulse generator, its largest synchronouspulse frequency is 30 kc; pulse width is 4 -40ns; adjustable amplitude is 200 -300. These cir-cuits can be used for controlling low -light silicon target pick -up tubes, for testing highvoltage electric device characteristics, for ns pulse source and laser modulation by impro-ving them slightly.The existing ns image converter framing cameras are limited in their applications, sincetheir framing rates can not be high enough to satisfy the requirements for measuring tran-sient phenomena. In 1982, we developed a ns ring- shaped grating image converter framing cam-era with an exposure time of 15ns and a frame spacing of 15Ons. The reason why these dataindexes are not high enough is that the ring -shaped grating image converter tube is verystrict with the front and back edges and the flat- topped oscillation of the shutter strobepulse waveform added to the control -grating of the ring- shaped grating image convertertube. The time of switching devices selected as gate pulses can not be very short. Theswitching devices are in a state of big current pulse discharging, the restoring time of thetube is longer from leading to stopping, so it is difficult for several gate pulses to formrather short spacing and steep -front and back serial pulses on the same common load. Thus,the dynamic space resolution of the image converter tube does not meet the applied require-ments because of the poor gate pulse waveform. The gate pulse generator switching device inthis kind of framing camera adopts a mixing circuit consisting of the avalanche transistorseries and the pulse thyratron (Fig. 1). The output pulse amplitude of this circuit is 550V,rising edge: 2.5ns, falling edge: 4.5ns, trigger delay: 14ns, jitter: 500ps. It adopts lowimpedance matched output. As the circuit has advantages of short trigger delay, little jit-ter and strong anti -electromagnetic interference ability the satisfied results have beenobtained in the test of once - through strong electromagnetic interference.Because of the reasons described above, it is impossible for this kind of image converterframing camera to provide a short exposure time and frame spacing. Hence, its applicationsare limited.In order to raise the framing rate of the image converter framing camera, at present, weare developing a modern version of ns framing image converter tube which is not strict withthe gate pulse waveform and the pulse amplitude, even if the pulse waveform is triangular.The dynamic space resolution of the tube is not much influnced and the pulse amplitude isnot highly required. Therefore, according to its requirements, we have developed a gatepulse generator circuit (Fig. 2) with rather high framing rate. Each branch circuit swit-ching device of this circuit adopts a fast -speed and high voltage avalanche transistorseries. The rapid restorer diodes ( D1 -D4) are connected to each discharging circuit res-pectively, and the isolating diodes (D5-D7) are added between each branch circuit respec-tively. The output pulse amplitude of the circuit is 200 -300V; the shortest pulse width is5 -1Ons; the pulse spacing is 5Ons. It is only when strict anti -interference measures havebeen taken, can the synchronous pulse circuit operate steadily. It is impossible to obtainseveral frames of pictures for tens of ns illuminous event with such kind of high speedframing camera.In order to overcome the shortcomings of not having achieved high framing rate for theimage converter tube because of controlling circuit (Fig. 3) of a trichannel double -proxim-" @default.
• W1992850510 created "2016-06-24" @default.
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• W1992850510 date "1989-06-07" @default.
• W1992850510 modified "2023-09-23" @default.
• W1992850510 title "A Shutter Strobe Circuit Used For Image Converter Tube, Double-Proximity Focused Image Intensifier And Photomultiplier With Microchannel Plate" @default.
• W1992850510 doi "https://doi.org/10.1117/12.969114" @default.
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