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摘要

背景杂散光信号的干扰制约了激光片光成像技术的发展, 本文将结构光照明技术应用到激光片光成像测量中来消除杂散光的干扰. 介绍了基于结构光照明技术的工作原理和实验测量系统, 基于Matlab软件理论分析了相位移动结构光照明技术具有完全消除杂散光的作用, 并针对稳定罗丹明B溶液进行了二维激光诱导荧光成像实验, 进一步验证了相位移动结构光照明技术具有消除杂散光影响、提高二维成像精确度的作用. 最后利用基于锁相放大原理的结构光照明技术实现了非稳态扩散罗丹明B溶液的二维荧光瞬态成像实验, 并分析了罗丹明B溶液扩散的相关规律.

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Abstract

Laser sheet imaging, also called planar laser imaging, is one of the most versatile optical imaging techniques and has been frequently used in several different areas. However, when applied to the limited operating space and strong light scattering media, the light originating from indirect reflections, multiple scattering and surrounding backgrounds can produce error especially in intensity-ratio based measurements. This work is motivated by these challenges, with the overall aim of making laser sheet imaging technique applicable for the study of eliminating the stray light interference. Therefore a novel two-dimensional imaging technique named structured laser illumination planar imaging (SLIPI) is developed based on planar laser imaging but uses a sophisticated illumination scheme i.e. spatial intensity modulation, to differentiate between the intensity contribution arising from useful signals and that from stray light. By recording and dealing with images, the SLIPI method can suppress the diffuse light and retain the useful signals. In this paper, we first use the MATLAB software to simulate the phase-shift SLIPI method, and the results show that the stray light interference can be eliminated completely. Furthermore, the phase-shift SLIPI is combined with the liquid solution (Rhodamine B solution) laser induced fluorescence (LIF) approach to imagine the concentration distribution. By recording three images, between which this encoding is changed noticeably only for the useful LIF signals, the phase-shift SLIPI method is evidenced to be able to remove the diffuse light contribution, thus improving and enhancing the visualization quality. The instantaneous SLIPI images of rapidly moving samples, a key feature to study dynamic liquid solution diffusion behavior, are also acquired. The lock-in amplifier SLIPI technique is then experimentally studied under Rhodamine B diffused solution, and the phase-shift SLIPI method can remove the unwanted background interferences and achieve the significant improvements in terms of pronounced concentration distribution within the Rhodamine B solution. The SLIPI technique is relatively inexpensive: the cost does not exceed the cost of an ordinary laser sheet arrangement noticeably, and it can combine with several other linear imaging techniques, such as Rayleigh scattering, particle image velocimetry and laser-induced phosphorescence.

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作者及机构信息

通信作者:陈爽,chenshuang827@gmail.com

基金项目:国家自然科学基金(批准号: 91641118)和中国空气动力研究与发展中心风雷青年创新基金(批准号: FLYIF20160017, PJD20180131)资助的课题

Authors and contacts

Corresponding author:Chen Shuang,chenshuang827@gmail.com

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 91641118) and the Fenglei Youth Innovation Fund of CARDC (Grant Nos. FLYIF20160017, PJD20180131)

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参考文献

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施引文献

下载: 全尺寸图片幻灯片

	背景分类	激光输出能量	相机曝光时间	相机增益	罗丹明B溶液浓度	图像正弦调制周期/像素
相位移动SLIPI技术	Case 1	100 mW	0.025 s	30	稳态溶液：1 × 10⁷mol/L	0.058593
	Case 2	100 mW	0.025 s	30	稳态溶液：1 × 10⁷mol/L	0.058593
	Case 3	100 mW	0.025 s	30	稳态溶液：1 × 10⁷mol/L	0.058593
基于锁相放大原理的SLIPI技术	Case 4	100 mW	0.025 s	30	非稳态扩散溶液: 将1 × 10⁶mol/L溶液注入到1 × 10⁷mol/L溶液.	0.144536

下载: 导出CSV

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