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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

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: Overview01:20

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 16, 2026

Non-contact, Label-free Monitoring of Cells and Extracellular Matrix using Raman Spectroscopy
13:48

Non-contact, Label-free Monitoring of Cells and Extracellular Matrix using Raman Spectroscopy

Published on: May 29, 2012

Laser Raman spectrometer for process control.

A M Karger, R P English, R J Smith

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new laser Raman spectrometer using interference filters was developed and tested. This device shows promise for process control applications, functioning with low laser power.

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    Last Updated: Jun 16, 2026

    Non-contact, Label-free Monitoring of Cells and Extracellular Matrix using Raman Spectroscopy
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    Published on: May 29, 2012

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    Area of Science:

    • Analytical Chemistry
    • Spectroscopy
    • Instrumentation Engineering

    Background:

    • Raman spectroscopy is a powerful technique for chemical analysis.
    • Developing portable and low-power instruments is crucial for field applications.
    • Interference filters offer a compact and efficient method for spectral filtering.

    Purpose of the Study:

    • To assemble and test an interference filter laser Raman spectrometer.
    • To evaluate the sensitivity and linearity of the instrument for various substances.
    • To assess the feasibility of using low laser power for practical applications.

    Main Methods:

    • Construction of a bread-board interference filter laser Raman spectrometer.
    • Testing the instrument's response to gases, volatile liquids, and their mixtures.
    • Evaluating performance with varying laser power levels.

    Main Results:

    • Demonstrated sensitivity and linearity of response for multiple analytes.
    • Confirmed functionality with less than 1 Watt of laser power.
    • Identified a trade-off between laser power and sensitivity.

    Conclusions:

    • The assembled interference filter laser Raman spectrometer demonstrates key principles for practical use.
    • The device shows potential for developing a prototype process control instrument.
    • Low-power operation is achievable, with implications for portable analytical systems.