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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...

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...

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Related Experiment Video

Updated: May 8, 2025

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis

Published on: December 16, 2016

Remote detection and identification of plastics with hyperspectral Raman imaging lidar.

Toshihiro Somekawa, Shinri Kurahashi, Shohei Matsuda

|December 24, 2024

Summary

A new hyperspectral Raman imaging lidar system can remotely detect and identify common plastics from 6 meters away. This technology offers a promising approach for monitoring marine plastic pollution.

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Last Updated: May 8, 2025

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis

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Published on: December 16, 2016

Separation and Identification of Conventional Microplastics from Farmland Soils

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Published on: March 21, 2025

Biomolecular Imaging of Cellular Uptake of Nanoparticles using Multimodal Nonlinear Optical Microscopy

Biomolecular Imaging of Cellular Uptake of Nanoparticles using Multimodal Nonlinear Optical Microscopy

Published on: May 16, 2022

Area of Science:

Spectroscopy
Remote Sensing
Environmental Science

Background:

Marine plastic pollution is a significant environmental concern.
Accurate identification and monitoring of plastic species are crucial for effective mitigation strategies.

Purpose of the Study:

To develop and demonstrate a hyperspectral Raman imaging lidar system for remote plastic detection and identification.
To provide a foundational technology for enhanced marine plastic pollution monitoring.

Main Methods:

Utilized a frequency-doubled, Q-switched Nd:YAG laser at 532 nm.
Employed an imaging spectrograph with a gated intensified CCD spectrometer.
Achieved stand-off detection at 6 meters with a 1 × 150 mm² field of view.

Main Results:

Successfully demonstrated remote detection and identification of typical plastic species.
Validated the system's capability for stand-off analysis of plastics.

Conclusions:

The developed hyperspectral Raman imaging lidar system shows significant potential for real-time, remote monitoring of plastic pollution.
This technology lays the groundwork for improved solutions in addressing marine plastic debris.