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相关概念视频

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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相关实验视频

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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高对比率优化总内部反射镜用于紧的中波红外目标仿真系统.

Zongyu Du1, Gaofei Sun1,2,3, Songzhou Yang1,2,3

  • 1School of Opto-Electronic Engineering, Changchun University of Science and Technology, Changchun 130022, Jilin, China.

iScience
|February 6, 2024
PubMed
概括

本研究引入了一种优化的全内反射 (TIR) 镜,以增强中波红外 (MWIR) 目标模拟系统中的成像对比度. 新设计显著提高了模拟图像质量和红外目标对比率.

关键词:
工程 工程师 工程师 工程师光学是什么?光学是什么?光学是什么?物理 物理学 物理

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 红外技术 红外技术
  • 光学工程是指光学工程.

背景情况:

  • 在中波红外 (MWIR) 目标模拟系统中,现有的全内反射 (TIR) 镜存在低图像对比率,降低模拟图像质量.
  • 这种限制影响了红外目标模拟在各种应用中的有效性.

研究的目的:

  • 建议和设计一个优化的TIR (OTIR) 镜,使用斯内尔定律来克服MWIR目标模拟中的低对比率问题.
  • 为了提高模拟红外目标的成像对比度和整体质量.

主要方法:

  • 为MWIR应用开发了基于斯内尔定律的优化TIR (OTIR) 镜设计.
  • 利用辐射理论在仿真系统中创建OTIR镜的约束模型.
  • 研究了数字微镜设备状态对光束方向的影响,并为三镜OTIR配置推导了设计方程.

主要成果:

  • 模拟证实,OTIR镜可提高紧型MWIR目标模拟系统中的对比比.
  • 实验验证表明,在700K的输出对比率大约为298:1的输出对比率.
  • 与测试范围内的光源温度升高时,对比度持续增加.

结论:

  • 设计的OTIR镜有效地提高了MWIR目标模拟系统的对比率.
  • 这种进步导致更高质量的模拟红外目标图像.
  • OTIR 镜为提高红外目标模拟准确度提供了一个实用的解决方案.