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Related Concept Videos

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Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Related Experiment Video

Updated: May 26, 2026

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
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Two-channel hyperspectral LiDAR with a supercontinuum laser source.

Yuwei Chen1, Esa Räikkönen, Sanna Kaasalainen

  • 1Department of Navigation and Positioning, Finnish Geodetic Institute, P.O. Box 15 02431 Masala, Finland. yuwei.chen@fgi.fi

Sensors (Basel, Switzerland)
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a new supercontinuum laser system for simultaneously measuring distance and vegetation reflectance. This technology can distinguish vegetation from inorganic materials using the Normalized Difference Vegetation Index (NDVI).

Keywords:
NDVIhyperspectral LiDARprototyperange finder

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Area of Science:

  • Optics and Photonics
  • Remote Sensing Technology
  • Forestry Applications

Background:

  • Supercontinuum laser sources offer broadband directional light via nonlinear optical interactions.
  • Simultaneous distance and reflectance measurements are crucial for material identification.
  • The Normalized Difference Vegetation Index (NDVI) is a key parameter for vegetation analysis.

Purpose of the Study:

  • To demonstrate a technique for distinguishing vegetation from inorganic materials using NDVI.
  • To assess the potential of a spectral range-finding system for coniferous tree analysis.
  • To measure three-dimensional parameters of Norway spruce using a supercontinuum laser.

Main Methods:

  • Development of a two-channel, spectral range-finding system utilizing a supercontinuum laser source.
  • Application of cascaded nonlinear optical interactions within an optical fiber framework.
  • Simultaneous measurement of distance (from echo waveform) and reflectance (at 600 nm and 800 nm).

Main Results:

  • The system successfully demonstrated the capability to distinguish vegetation targets from inorganic materials.
  • The Normalized Difference Vegetation Index (NDVI) was effectively calculated for Norway spruce.
  • Three-dimensional parameters of the coniferous tree were assessed using the spectral range-finding system.

Conclusions:

  • Supercontinuum laser-based spectral range-finding systems show promise for vegetation analysis.
  • The developed prototype system, built with commercial components, is effective for NDVI determination.
  • This technology can simultaneously provide range and spectral information for environmental monitoring.