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相关概念视频

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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IR Spectrometers01:25

IR Spectrometers

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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...
1.1K
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

3.0K
Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
3.0K
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

391
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
391
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

219
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
219
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

645
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
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相关实验视频

Updated: Jul 1, 2025

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
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设计方法用于设计光谱仪的初始结构.

Zhaoqing Yang, Meng Xue, Hanming Guo

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    此摘要是机器生成的。

    一种新的工程初始结构方法 (MEIS) 通过考虑组件大小和位置来改进光谱仪设计,避免干扰. 与以前的光学方法相比,这种方法提供了一种更合理和更有效的方法.

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    科学领域:

    • 光学工程的光学工程.
    • 频谱仪的设计设计.

    背景情况:

    • 传统的光学初始结构方法 (MOIS) 仅专注于光学特性,忽视了组件尺寸.
    • 这种监督导致初始和优化参数之间的显著差异,降低了初始结构的实际价值.

    研究的目的:

    • 在光谱仪中引入更有效的工程初始结构 (MEIS) 设计方法.
    • 纳入物理约束,如组件大小和相对位置,以防止光学元件干扰.

    主要方法:

    • 使用射线追踪来推断反干扰条件.
    • 通过几何光学推导成像公式.
    • 快速计算组件参数和初始结构获取与间距边缘.

    主要成果:

    • 使用MEIS成功设计了一种使用MEIS的宽带高分辨率光谱仪 (700-1000nm,0.5nm分辨率).
    • MEIS导致了更合理的组件放置,并消除了复杂的优化.
    • 观察到图像平面位置,轮距 (<0.5毫米) 和偏斜角度 (0.5°) 的最小变化.

    结论:

    • MEIS为快速有效的光谱仪设计提供了宝贵的参考.
    • 该方法确保初始结构在物理上可行,并避免组件干扰.
    • MEIS显著改善了以前仅光学设计方法的局限性.