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UV–Vis Spectrometers01:14

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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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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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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.
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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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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.
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In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
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Monolithic Miniature Glass Spectrometer.

Jiashun Qian1, Tao Chu1

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

Applied Spectroscopy
|August 21, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a compact, stable monolithic spectrometer with sub-nanometer resolution. A dual-band design extends its spectral range for enhanced material identification capabilities.

Keywords:
Monolithic spectrometeraberration-correcting gratingcrossed Fastie–Ebert spectrographdual-band designmini-spectrometer

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Area of Science:

  • Optical Engineering
  • Spectroscopy
  • Material Science

Background:

  • Traditional mini spectrometers face limitations in size, stability, and spectral range.
  • Accurate material identification relies on detailed spectral fingerprints.

Purpose of the Study:

  • To develop a compact and stable monolithic spectrometer.
  • To extend the spectral range for improved material identification.
  • To investigate aberration compensation techniques for enhanced performance.

Main Methods:

  • Design and fabrication of a monolithic spectrometer utilizing a plano-convex glass lens.
  • Implementation of a dual-band design to cover visible and near-infrared spectra.
  • Utilizing an aberration-correcting grating to mitigate optical distortions.

Main Results:

  • Achieved a resolution better than 0.7 nm within the 550-720 nm spectral range.
  • Demonstrated a dual-band capability extending the range to 800-900 nm.
  • Confirmed the effectiveness of aberration correction for improved spectral quality.

Conclusions:

  • The monolithic spectrometer offers a significant size and stability advantage over traditional designs.
  • The extended spectral range enhances its utility for material identification.
  • Aberration correction is crucial for maximizing the performance of compact spectrometers.