摘要
由于强散射介质的散射作用,使得传统光学成像系统难以有效探测其内部目标。针对这一难点,提出了一种对强散射介质内部目标进行高分辨率实时成像的方法。基于强散射介质波前校正原理,采用汇聚照明方式,通过纯相位型空间光调制器,对散射介质表面点目标进行校正,使其清晰成像。在此基础上,保持调制图样不变,将汇聚照明改为扩展照明,即可实现对校正点附近较大视场和景深范围内目标的实时清晰成像。基于此方法搭建的实验系统很好地实现了强散射介质内部目标的实时成像,通过比较传统光学系统在无散射介质条件下和散射成像系统在有强散射介质条件下的成像质量,结果表明,散射成像系统具有更高的成像锐度。
The scattering effect of strongly scattering medium makes the traditional optical imaging system can not detect the internal targets of scattering medium. To resolve this problem, a method is proposed to real-time detect the object locates in the strongly scattering medium with high resolution. According to the principle of wave front shaping theory, in condition of convergent lighting, pure phase spatial light modulator is employed to obtain a clear image of a spot target on the surface of the scattering medium. After the illumination is expanded, objects near the pre- corrected point can be clear imaged with a large field of view and a long depth of field with the modulation pattern unchanged. The experimental results prove this method can achieve high acuity real-time imaging. The imaging quality of the traditional optical imaging system without scattering medium and the scattering imaging system with scattering medium is compared. The experimental results show that the scattering imaging system has a better imaging acuity than the conventional optical imaging system.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2015年第2期158-164,共7页
Acta Optica Sinica
基金
国家高技术研究发展计划(2014AA022302)
关键词
成像系统
散射介质成像
波前校正
高分辨率
空间光调制器
imaging systems
imaging through turbid media
wave front shaping
high resolution
spatial light modulator
