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What kind of radiation is used in a spectrometer

Fiber and communications infrastructure knowledge brief Published 14 Jul 2024

Prepared for preliminary research by the ROGER FIBRE knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Spectrometers use electromagnetic radiation, typically light in the ultraviolet, visible, or infrared range, generated by lamps or lasers depending on the application.

Types of Radiation

Spectrometers operate by analyzing electromagnetic radiation that interacts with a sample. The radiation can span a wide range of the spectrum, including ultraviolet (UV), visible, and infrared (IR) light, and in specialized instruments, even X-rays or gamma rays for non-optical spectrometry. The choice of radiation depends on the type of spectrometer and the material being studied.

Radiation Sources

There are two main classes of radiation sources used in spectrometry: Continuum Sources: These emit a broad range of wavelengths. Examples include tungsten lamps for visible light, deuterium lamps for UV, and heated solids. The emitted light is then narrowed using optical elements like prisms or diffraction gratings to select the desired wavelength.

Line Sources: These produce radiation at specific, discrete wavelengths. Examples include gas discharge lamps (argon, xenon, hydrogen, or deuterium) and lasers. Gas lamps excite atoms in a sealed chamber to emit characteristic spectral lines, while lasers generate highly monochromatic light through stimulated emission.

How Radiation is UsedIn a spectrometer, the selected radiation interacts with the sample by being absorbed, transmitted, or reflected. The spectrometer then measures changes in intensity or wavelength to produce a spectrum, which can reveal the sample's composition, structure, or other properties. Optical spectrometers often use diffraction gratings or prisms to disperse the light into its constituent wavelengths for detection.

Summary

In essence, spectrometers rely on electromagnetic radiation as the probing medium. The radiation can be broad-spectrum or monochromatic, sourced from lamps or lasers, and is chosen based on the spectral region of interest and the type of analysis being performed. This versatility allows spectrometers to study materials across a wide range of scientific fields, from chemistry to astronomy.

What kind of radiation is used in a spectrometer - ROGER FIBRE ATELIER [PDF]

What kind of radiation is used in a spectrometer

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