Research On Mechanism Of Gated-self Imaging Based On Microchannel Plate Waveguide Gate Structure

Gated imaging technology is developed on the basis of laser active imaging technology.The research of strobe imaging technology is to shield other noise signals in the laser active imaging,and only receive the reflected light signals from the target to improve the imaging quality.The traditional laser active gated imaging technology is mainly based on the laser flight time or the distance between the detector and the target.This gated imaging technology has some shortcomings,such as insufficient ranging accuracy,large margin reserved for the gate,and too long afterglow time of the fluorescent screen.Based on the analysis of the traditional gated imaging technology,this paper proposes a new gated imaging scheme.Firstly,the basic principle of strobe imaging technology and the traditional synchronous control scheme are described,and the technical bottleneck is analyzed.In this paper,the mathematical model of gated imaging technology is discussed,and the influences of gate width,laser pulse energy,signal-to-noise ratio and target detectability probability on gated imaging are analyzed in theory,which provides a theoretical basis for the later simulation analysis.Secondly,according to the principle of the second electron multiplication of microchannel plate,combined with the transition characteristics of photoelectrons between the electrodes of vacuum devices and the transient luminescence characteristics of csppbbr3 quantum dot materials,a new type of gated imaging device is proposed.The structure design and working principle of the new gated imaging device are presented.The design basis of the composite gate structure,which is the key component of the device,is described.The manufacturing process of the composite gate is given.The influence of the afterglow of the fluorescent screen on the gated imaging is discussed.Finally,we designed a gated pulse source for verification,and tested the performance of the pulse source.We verified that the modulated composite gate can generate two channels of electrical signals,one of which is used to trigger gating and the other is used for imaging.We tested the transient luminescent characteristics of cspbbr3 quantum dots as anode,and verified that cspbbr3 quantum dots can be used as short afterglow fluorescence The feasibility of screen fluorescent material,the numerical simulation and imaging simulation of self gating imaging are given.Through the experiment and simulation analysis,it shows that the self gated imaging device can improve the quality of gated imaging by improving the consistency of synchronous control and using the short afterglow fluorescence characteristics of csppbbr3 quantum dot material to reduce the gate width and improve the time resolution.