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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.
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Mixture Detection Using a Deep-UV Raman-LIBS Autofocus-Based Compact Chemical Spectroscopic Sensor.

Atchutananda Surampudi1, Anil Aryal2, Tilak Hewagama3

  • 1Charles L. Brown Department of Electrical and Computer Engineering, University of Virginia (UVA), Charlottesville, Virginia 22904, United States.

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Summary
This summary is machine-generated.

We developed a compact, handheld chemical sensor combining deep-UV Raman and laser-induced breakdown spectroscopy (LIBS) for versatile in situ analysis. This lightweight, single-laser system achieves high sensitivity for mixture detection in diverse samples.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Sensor Technology

Background:

  • Traditional integrated chemical sensors often require multiple laser wavelengths, increasing complexity and bulk.
  • Handheld devices for in situ chemical analysis are highly desirable for field applications but face limitations in sensitivity and portability.

Purpose of the Study:

  • To develop a compact, lightweight, and multifunctional chemical sensor integrating deep-UV Raman and laser-induced breakdown spectroscopy (LIBS).
  • To demonstrate the sensor's capability for sensitive mixture detection using a single laser source and autofocus mechanism.

Main Methods:

  • A single 266 nm deep-UV laser source (1.5 ns pulse, 10 mW) was used in a 3D-printed, palm-sized unit (38 g).
  • The system integrates Raman and LIBS modalities with an autofocus mechanism for seamless mode switching.
  • The complete system, including laser and spectrometer, weighs under 500 g.

Main Results:

  • Demonstrated mixture detection down to 0.1% in complex mineral, isotope, and organic-inorganic samples.
  • Deep-UV excitation enhanced Raman signal strength and reduced fluorescence interference.
  • The compact sensor achieved high sensitivity, previously requiring bulky intensified CCDs.

Conclusions:

  • The single-laser, deep-UV sensor offers a simplified, portable, and robust solution for in situ chemical analysis.
  • This technology is suitable for mobile applications, including environmental monitoring and planetary exploration.
  • The design significantly reduces optical complexity and system footprint compared to existing integrated approaches.