Optical fiber phased array multi-beam scanning system based on array detector

Abstract

The invention provides an optical fiber phased array multi-beam scanning system based on an array detector, which mainly solves the accuracy problem of beam scanning and comprises a beam generation subsystem (1), a phase control subsystem (2), a coupling optical subsystem (3) and the array detector (4). The coupling optical subsystem is a multi-mode optical fiber bundle arranged in space, the array detector is a linear array or area array detector, and central sub-view-field sampling output by the optical fiber phased array is achieved in a matched mode. Phase noise compensation is carried outthrough a phase control subsystem (based on an SPGD algorithm) according to the light beam space scanning time sequence to form a to-be-scanned multi-light-beam dot matrix; and then a preset scanningvoltage is applied to the multiple paths of optical fiber light beams, and if the light intensity sampling of the array detector is lower than a threshold value, scanning voltage fine tuning calibration at a corresponding position is performed by utilizing a phase control subsystem. Phase feedback control is performed by using the array detector, and accurate pointing of space and rapid coverageof a field of view are simultaneously realized through multi-beam scanning.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and in particular relates to an optical fiber phased array scanning system, which can be used for multi-beam scanning to simultaneously realize accurate spatial orientation and fast coverage of a field of view. [0002] technical background [0003] Beam scanning technology is a technology that precisely controls and positions the direction of the laser beam. Common beam scanning technologies include mechanical, micro-electromechanical and purely electronic control. Optical fiber phased array belongs to pure electric control type. Compared with mechanical type and micro-electromechanical type, optical fiber phased array has the characteristics of small inertia, fast scanning speed and high sensitivity. It is used in high-energy laser synthesis, multi-target detection and tracking, It has been widely used in complex target imaging and other fields. However, the optical fiber phase...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a fiber optic phased array multi-beam scanning system based on an array detector to solve the problem of inaccurate scanning of fiber optic phased array multi-beams in the prior art

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