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相关概念视频

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

1.4K
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.
1.4K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

450
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
450
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

524
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.
524
IR Spectrometers01:25

IR Spectrometers

1.2K
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...
1.2K
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

785
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...
785

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In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
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单立体微型玻璃光谱仪

Jiashun Qian1, Tao Chu1

  • 1College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, China.

Applied spectroscopy
|August 21, 2023
PubMed
概括

这项研究引入了一个紧,稳定的单立体光谱仪,具有亚纳米分辨率. 双带设计扩展了其光谱范围,以增强材料识别能力.

科学领域:

  • 光学工程是指光学工程.
  • 频谱学是一种光谱学.
  • 材料科学 是一种材料科学.

背景情况:

  • 传统的迷你光谱仪面临着尺寸,稳定性和光谱范围的限制.
  • 准确的材料识别依赖于详细的光谱指纹.

研究的目的:

  • 开发一个紧且稳定的单立体光谱仪.
  • 扩大光谱范围,以改善材料识别.
  • 为了提高性能,研究偏差补偿技术.

主要方法:

  • 设计和制造使用平面凸玻璃透镜的单体光谱仪.
  • 实施双带设计,覆盖可见光和近红外光谱.
  • 使用纠正偏差的格子来减轻光学扭曲.

主要成果:

  • 在550-720nm光谱范围内实现了比0.7nm更好的分辨率.
  • 证明了双频带能力,将范围扩展到800-900 nm.
  • 证实了偏差校正的有效性,以改善光谱质量.

结论:

  • 单体光谱仪比传统设计具有显著的尺寸和稳定性优势.
关键词:
一个单一的光谱仪.纠正偏差的格子 纠正偏差的格子穿越了法斯蒂 - 埃伯特光谱仪.双频段设计 双频段设计迷你光谱仪的使用

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  • 扩大的光谱范围增强了其用于材料识别的实用性.
  • 偏差校正对于最大限度地提高紧光谱仪的性能至关重要.