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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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...
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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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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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Remote Raman Sensing Using a Single-Grating Monolithic Spatial Heterodyne Raman Spectrometer: A Potential Tool for

Evan M Kelly1, Miles J Egan1, Arelis Colόn2

  • 1Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, Honolulu, HI, USA.

Applied Spectroscopy
|October 12, 2022
PubMed
Summary
This summary is machine-generated.

A new single-grating monolithic SHRS (1g-mSHRS) offers a compact, robust Raman spectrometer for planetary exploration. This instrument provides high spectral resolution and range with reduced alignment sensitivity, ideal for remote sensing applications.

Keywords:
1g-mSHRSS/NSHRSSpatial heterodyne Raman spectrometermineralsorganic compoundsremote Raman sensingsignal-to-noise ratiosingle-grating monolithic spatial heterodyne spectrometer

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Area of Science:

  • Spectroscopy
  • Planetary Science Instrumentation

Background:

  • Remote dispersive Raman spectrometers face challenges like large size, low light throughput, limited spectral range, and sensitivity to misalignment.
  • Spatial heterodyne Raman spectrometers (SHRS) offer improvements, with one-grating SHRS (1g-SHRS) variants being more compact.

Purpose of the Study:

  • To investigate a single-grating monolithic SHRS (1g-mSHRS) by integrating a 1g-SHRS with a monolithic setup.
  • To assess the 1g-mSHRS as a candidate for planetary exploration instruments.

Main Methods:

  • Developed a monolithic device integrating the beamsplitter, grating, and mirror.
  • Characterized the 1g-mSHRS by measuring time-resolved remote Raman spectra of inorganic salts, organics, and minerals at 3 meters.
  • Evaluated the instrument's spectral resolution, range, alignment sensitivity, and light throughput.

Main Results:

  • The 1g-mSHRS achieved a compact footprint (35 × 35 × 25 mm, 80 g) with high spectral resolution (∼9 cm-1) and a large spectral range (7327 cm-1).
  • Demonstrated decreased sensitivity to alignment and high light throughput.
  • Successfully measured remote Raman spectra of various sample types at 3 meters.

Conclusions:

  • The 1g-mSHRS is a promising candidate for planetary exploration due to its compact size, ease of alignment, and robust performance.
  • Its features, including high spectral resolution, large spectral range, and low alignment sensitivity, address limitations of traditional dispersive Raman spectrometers for remote sensing.