CAJ | 학술논문

研制了光栅衍射型超广角激光告警样机，推导了系统探测灵敏度的估算公式，用1064 nm脉冲激光在半视场角0°～78°范围内测试了样机的最小可探测能量密度。结果表明，半视场角0°～42°范围内，入射激光能量密度保持1.8 nJ/cm2基本不变的情况下，告警系统1级成像光斑的灰度值约由20逐渐减小为7；48～78°范围内，告警系统的最小可探测能量密度约由2 nJ/cm2逐渐增大为7 nJ/cm2；分析表明，随激光入射角度增大，告警系统像差增大导致成像光斑面积变大是引起告警系统最小可探测能量密度变大的主要原因。
연제료광책연사형초엄각격광고경양궤，추도료계통탐측령민도적고산공식，용1064 nm맥충격광재반시장각0°～78°범위내측시료양궤적최소가탐측능량밀도。결과표명，반시장각0°～42°범위내，입사격광능량밀도보지1.8 nJ/cm2기본불변적정황하，고경계통1급성상광반적회도치약유20축점감소위7；48～78°범위내，고경계통적최소가탐측능량밀도약유2 nJ/cm2축점증대위7 nJ/cm2；분석표명，수격광입사각도증대，고경계통상차증대도치성상광반면적변대시인기고경계통최소가탐측능량밀도변대적주요원인。
A model machine of super wide angle laser warning system based on grating diffraction was developed,and the sensitivity estimate-formula of the system was derived,then the minimum detectable energy density of the machine was tested by using 1064nm pulse laser in the half field angle range 0°~78°.Results show that the grey value of ima-ging light spot in this warning system decreases from 20 to 7 when the incident laser energy intensity remains 1.8 nJ/cm2 in the angle scope of 0°~42°,and the minimum detectable energy density increases from 2nJ/cm2 to 7nJ/cm2 with the incident angle from 48°to 78°.With the incident angle increasing,the optical aberration of the system increa-ses,it causes the imaging spot to be bigger.That is the main reason for the increasing of the minimum detectable ener-gy density.