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Related Concept Videos

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...
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...

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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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EXPRESS: Wave Lensing Effects on a Remote Raman Sensor: Enhanced Mean and the Intensity Distribution of Raman

Paige K Williams, Whitney E Schuler, Zechariah B Kitzhaber

    Applied Spectroscopy
    |May 26, 2026
    PubMed
    Summary
    This summary is machine-generated.

    Surface waves significantly impact remote water sensing. Wave-induced lensing creates strong Raman scattering "flashes," altering signal strength and sampling depth for airborne optical measurements.

    Keywords:
    QuantitativeRaman scatteringinstrumentationmodelingwater

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    Area of Science:

    • Optics
    • Environmental Science
    • Remote Sensing

    Background:

    • The water OH Raman band is a standard for remote fluorescence measurements.
    • Surface waves can perturb optical signals through a lensing effect, changing signal strength and sampling depth.

    Purpose of the Study:

    • To investigate the impact of wave-induced lensing on water's Raman scattering signals.
    • To analyze signal variability and develop a model for wave effects on remote optical sensing.

    Main Methods:

    • Utilized a small remote optical sensor in a diving pool.
    • Observed Raman scattering from water under varying wave conditions.
    • Developed a mathematical model for weak lensing effects from sinusoidal waves.

    Main Results:

    • Observed wave-induced Raman "flashes" stronger than sunlight focusing effects.
    • Noted an approximately logarithmic distribution of signal strengths.
    • Measured an increase in average signal strength in the presence of waves.
    • Reported the impact of avalanche multiplication noise on flat water Raman scattering.

    Conclusions:

    • Wave-induced lensing significantly affects remote sensing of water's Raman signal.
    • The developed model helps interpret observed signal variability due to surface waves.
    • Understanding these effects is crucial for accurate airborne optical measurements in aquatic environments.