Self-triggered gated laser imaging method

Abstract

The invention discloses a self-triggering gated laser imaging method, and belongs to the technical field of the laser active imaging detection. The self-triggering gating in the invention is represented as follows: a pulse power supply adds backward voltage at 50-100V between an exiting end surface electrode of a primary micro-channel plate and an incident end surface electrode of a secondary micro-channel plate under an ordinary state; when an electronic beam image exited from the primary micro-channel plate is located between two laser pulses on the time, the electronic beam image is actually corresponding to a background noise light image at this time, and can be blocked by the backward voltage; when the electronic beam image exited from the primary micro-channel plate is located in thelaser pulse on the time, a part of electrons with large kinetic energy of the electronic beam image reaches a trigger signal bypass electrode and inputs trigger current into a trigger circuit, and the trigger current is greater than the preset current threshold, so that the trigger circuit outputs a gating signal same as the laser pulse duration; after receiving the gating signal, the pulse powersupply instantaneously converts the output backward voltage into forward voltage at 200-250V, and the electronic beam image normally passes through a micropore array grid at this time.

Description

technical field [0001] The invention relates to a self-triggering and gating laser imaging method, which belongs to the technical field of laser active imaging detection. Background technique [0002] The existing range-gated laser active imaging detection technology is that the laser imaging light source emits infrared short-pulse laser, which is divided into beams after being collimated. One beam illuminates the target and is reflected by the target to become a detection image signal and imaged on the gating camera; the other beam After the target is illuminated, it is reflected by the target as an external trigger source and received by an external trigger device (such as APD) as a delayed reference pulse; the delay time of the synchronous control circuit is determined according to the distance between the laser imaging light source and the target, and determined according to the imaging detection depth of field The duration of the opening of the gate, at the moment of ga...

AI Technical Summary

Problems solved by technology

It’s just that the spectroscopic scheme adopted by this scheme makes part of the laser light not used for imaging, which will inevitably reduce the optical power of the detection image signal, which is not conducive to the improvement of the signal-to-noise ratio of imaging detection

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