Method and system thereof for measuring time of exposure of door-control type image intensifier

Abstract

The invention provides a method and a system thereof for measuring the time of exposure of a door-control type image intensifier, which are suitable for measuring the time of exposure of various ultra-high speed photoelectric cameras adopting the door-control type image intensifier as a shutter. The method adopts picosecond (ps) pulsed laser for illumination, n times n pieces of optical fibers thelength of which is distributed in an equidifferent way form a laser array with n times n points in the way of delay, the laser array is regarded as a shoot target and is imaged on the door-control type image intensifier by an objective lens, the door-control type image intensifier outputs an image, the image is coupled with a CCD camera, the CCD camera records the quantity of the shot laser arraypoints, the space number of the laser points is calculated and then times time interval so as to obtain the time of exposure of the door-control type image intensifier. The invention can be directlyused for marking the time of exposure of ultra-high speed photoelectric framing cameras, and has broad application prospect in the field of researching the door-control type image intensifier as wellas in the measurement of time of exposure of the ultra-high speed photoelectric framing cameras.

Description

technical field [0001] The invention belongs to the technical field of high-speed photographic testing, and in particular relates to a method for measuring the exposure time of a gated image intensifier and a measuring system thereof, which are directly applied to calibrating the performance indexes of high-speed photographic instruments. Background technique [0002] High-speed photography is a method to study the process of high-speed motion, and it is one of the important optical testing methods in the research fields of detonation physics, shock wave physics, accelerator physics and plasma experiments. High-speed photographic instruments can be divided into digital high-speed cameras (with a photographic frequency up to 10×10 4 frame / s), rotating mirror high-speed camera (shooting frequency is 1×10 4 Amplitude / s~1×10 7 frame / s), ultra-high-speed photoelectric framing camera (photography frequency > 10 8 frame / s). [0003] The ultra-high-speed photoelectric framing...

AI Technical Summary

Problems solved by technology

The gated image intensifier acts as an optical shutter in transient photography applications. As a high-speed optical shutter, the exposure time depends on the pulse width and rise time of the electrical signal applied to the cathode, so the gated image intensifier and ultra-high-speed The exposure time of photoelectric framing cameras etc. is generally characterized by fast high-voltage pulse half-width time, which is an indirect measurement method and will bring large errors. In order to solve this problem, the present invention provides a direct measurement method, which can Actual measurement of real exposure time of gated image intensifiers and ultra-high-speed photoelectric framing cameras, etc.

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