摘要
针对烟雾环境中偏振前向传输在短波红外波段是否具有偏振信号增强的问题,实验研究了烟雾环境中水平线偏振光在532 nm和1 550 nm波长下的前向传输偏振特性。烟雾环境由烟饼燃烧所制,其主要由悬浮氯化铵颗粒和水汽组成,且氯化铵颗粒在烟饼点燃7~16 min内稳定沉积。搭建了532 nm和1 550 nm两套单波长激光前向传输测试平台,用以测量水平线偏振光在烟雾环境中的前向传输偏振特性。分析测量误差主要由激光源的光强波动误差、测量时间变化误差、偏振器件的安装误差和转角误差引起,计算了532 nm和1 550 nm激光前向传输测试平台的测量误差峰值分别约为1.03%和0.89%。测试烟饼燃烧7~16 min时的偏振状态保持率RoPS,测试结果表明:相比532 nm波长,水平线偏振光在1 550 nm波长前向传输后具有更优异的偏振状态保持特性,且随着烟雾浓度降低,两者之间的偏振状态保持差异逐渐缩小。文中研究通过实验验证了所制烟雾环境中水平线偏振光在1 550 nm波长前向传输后具有优异的偏振信号,这可为短波红外偏振技术的实际应用提供一定的实验支撑。
There are potential of polarization signal enhancement in smog environments at shortwave infrared wavelengths. The polarization characters for forward propagation at 532 nm and 1 550 nm wavelengths were investigated by experiments. The smoke environment was made by burning smoke cake. It mainly composes of NH;Cl particles and water vapor. NH;Cl particles deposited stably when smoke cake burned in 7-16 min. The laser test platforms at 532 nm and 1 550 nm wavelengths were developed to measure forward propagation character of horizontally linearly polarized light. Measurement errors of 532 nm and 1 550 nm laser test platforms were nearly 1.03% and 0.89%, respectively. It mainly included fluctuation error of laser, time variation error, installation error and rotation error. The polarization state retention rate RoPS was tested when smoke cake burned in 7-16 min. The experimental results show that horizontally linearly polarized light has superior forward propagation performance at 1 550 nm wavelength. And as the smoke concentration decreases,the difference of RoPS values gradually reduce. The work verifies the persistence of horizontally linearly polarized light at 1 550 nm wavelength. It can provide experimental support for application of infrared polarization technology.
作者
曾祥伟
李亚红
张燕
褚金奎
Zeng Xiangwei;Li Yahong;Zhang Yan;Chu Jinkui(College of Transportation,Ludong University,Yantai 264025,China;College of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China;Yantai Addcare Bio-Tech Limited Company,Yantai 264006,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2022年第3期355-360,共6页
Infrared and Laser Engineering
基金
国家自然科学基金(62105136,11904044)。
关键词
偏振传输
前向散射
短波红外
polarization propagation
forward scattering
shortwave infrared
