Abstract Many laboratory experimental techniques used for investigating fine fluid structure, such as fiber spinning, microfluidic flow, and electrospinning, require high quality images with good contrast. Common processes of observation and image recording rely heavily on highly technical light and camera setups which can be difficult to operate in some processing conditions and expensive as well. Here, we report a facile technique using LED backlight imaging to investigate ultrathin fluid profile in two different processes, melt electrospinning and tubeless siphoning. The setup comprises of a simple LED light source facing toward the camera, directly shining into the camera lens. The object under investigation was placed between the camera and the light source. The high-quality captured images and video recordings enable the precise analysis of the cone diameter and jet solidification in case of melt electrospinning, and extensional behavior profiles for tubeless siphoning. The LED backlight setup with high resolution camera is a useful tool to investigate sub-micron scale dimensions in fiber spinning, microfluidic flow, solution electrospinning, contact angle measurement for surface properties analysis, etc.

中文翻译：

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一种用于研究亚微米级加工的简易 LED 背光原位成像技术

摘要 许多用于研究精细流体结构的实验室实验技术，如纤维纺丝、微流体流动和静电纺丝，都需要具有良好对比度的高质量图像。观察和图像记录的常见过程在很大程度上依赖于高度技术性的光和相机设置，这些设置在某些处理条件下可能难以操作且成本高昂。在这里，我们报告了一种使用 LED 背光成像的简便技术来研究两种不同工艺中的超薄流体剖面，熔体静电纺丝和无管虹吸。该设置包括一个面向相机的简单 LED 光源，直接照射到相机镜头中。被调查的物体被放置在相机和光源之间。高质量捕获的图像和视频记录能够在熔体静电纺丝的情况下精确分析锥体直径和射流凝固，以及无内管虹吸的拉伸行为曲线。带有高分辨率相机的 LED 背光设置是研究纤维纺丝、微流体流动、溶液静电纺丝、接触角测量以进行表面特性分析等亚微米尺度尺寸的有用工具。