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Raman Spectroscopy Instrumentation: Overview

Raman Spectroscopy Instrumentation: Overview

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...

Raman Spectroscopy: Overview

Raman Spectroscopy: Overview

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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...

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Updated: Jun 12, 2026

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

Published on: April 12, 2017

Non-invasive analysis in micro-reactors using Raman spectrometry with a specially designed probe.

Sergey Mozharov¹, Alison Nordon, John M Girkin

¹WestCHEM, Department of Pure and Applied Chemistry and CPACT, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK.

|June 15, 2010

Summary

A new optical interface enhances Raman spectrometry for micro-reactor monitoring, improving sensitivity and spatial resolution. This advanced probe enables real-time reaction tracking and optimization, surpassing conventional methods.

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Area of Science:

Analytical Chemistry
Chemical Engineering
Optical Physics

Background:

Raman spectrometry is crucial for reaction monitoring in micro-reactors.
Conventional probes often lack the required sensitivity and spatial resolution.
Optimizing optical interfaces is key to improving micro-reactor analysis.

Purpose of the Study:

To design and evaluate an advanced optical interface for enhanced Raman spectrometry in micro-reactors.
To compare the performance of the new interface against conventional commercial probes.
To determine optimal optical parameters for maximizing sensitivity and spatial resolution.

Main Methods:

Design of a novel optical interface utilizing a miniature aspheric lens.
Investigation of different optical fiber diameters and numerical apertures (NA).
Real-time monitoring of an esterification reaction within a 150 micrometer deep micro-reactor channel.

Main Results:

The miniature aspheric lens outperformed microscope objectives for laser focusing.
62.5 micrometer diameter, 0.28 NA optical fibers yielded optimal sensitivity and signal-to-background ratio for liquid analysis.
The probe successfully monitored esterification in real-time with a 2-second spectral measurement time.

Conclusions:

The developed optical interface significantly enhances Raman spectrometry for micro-reactor applications.
The optimized interface provides superior sensitivity and spatial resolution compared to commercial probes.
Rapid, real-time measurements revealed previously undetected reaction dynamics and micro-reactor phenomena.