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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...

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Related Experiment Video

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Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels
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Published on: September 8, 2016

Molecular backscatter heterodyne lidar: a computational evaluation.

B J Rye

    Applied Optics
    |February 21, 2008
    PubMed
    Summary

    Heterodyne lidar using infrared systems can measure wind, temperature, and pressure. These systems require power levels similar to current direct detection lidars, despite a weaker Rayleigh cross section.

    Area of Science:

    • Atmospheric physics
    • Optical remote sensing

    Background:

    • Molecular scattering lidar systems are crucial for atmospheric measurements.
    • Infrared lidar offers potential advantages for atmospheric profiling.

    Purpose of the Study:

    • To evaluate the feasibility of heterodyne lidar for observing molecular scattering in the infrared spectrum.
    • To compare the performance of infrared heterodyne lidar with existing visible/ultraviolet direct detection systems.

    Main Methods:

    • Theoretical analysis of heterodyne lidar performance for molecular scattering.
    • Modeling of Rayleigh-Brillouin scattering in infrared atmospheric conditions.

    Main Results:

    • Infrared heterodyne lidar requires comparable mean power levels to current direct detection lidars.

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  • Rayleigh-Brillouin scattering in the infrared results in a narrow spectral triplet.

    • Conclusions:

    • Infrared heterodyne lidar is a viable technology for atmospheric measurements.
    • The spectral characteristics of infrared Rayleigh-Brillouin scattering are advantageous for wind, temperature, and pressure profiling.