改进的相干光照明强度相干成像方法

Improved Coherent Light Illumination Intensity Correlation Imaging Method

在主动照明强度相干成像方法中,考虑相干性变化对成像频谱模值的影响.建立上行链路光场空间相干性变化模型;引入相干因子建立基于相干性变化的强度相干成像模型;仿真相干性变化对强度相干成像频谱模值的影响;最后设计实验验证模型的正确性,分析所提模型和原模型恢复频谱模值与真实频谱模值的峰值信噪比.结果表明:在有激光主动照明时引入相干性因子是必要的,不同湍流相干长度下峰值信噪比较原模型提高了3.6%~6.2%.基于相干性变化建立的强度相干成像模型恢复的频谱模值质量更好.

In the active illumination intensity imaging method,the effect of coherence changes on the spectral modulus was considered.The model of the spatial coherence of the uplink coherent light field was established which the coherence factor was introduced on this basis.And the intensity correlation imaging model based on coherence change was established.The influence on spectral modulus of the intensity correlation imaging was simulated by coherence changes.The correctness of the model is verified by the design experiment.The peak signal to noise ratio of the spectral modulus of the proposed model and the original model is analyzed.According to the analysis results,it is necessary to introduce the coherence factor in active laser illumination;and the peak signal to noise ratio is improved by 3.6%~6.2%in different turbulence coherence length.The quality of the spectral modulus recovered by the proposed intensity correlation imaging model based on coherence change is better.