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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
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Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.

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Related Experiment Video

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Three-dimensional Optical-resolution Photoacoustic Microscopy
08:31

Three-dimensional Optical-resolution Photoacoustic Microscopy

Published on: May 3, 2011

Airborne synthetic aperture acoustic imaging.

M Soumekh1

  • 1Lincoln Lab., MIT, Lexington, MA.

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|January 1, 1997
PubMed
Summary

This study introduces a new airborne synthetic aperture acoustic (SAA) imaging model and inversion technique. It offers superior accuracy compared to synthetic aperture radar (SAR) for near-range targets, especially when vehicle speed approaches wave speed.

Area of Science:

  • Acoustics
  • Signal Processing
  • Imaging Systems

Background:

  • Traditional synthetic aperture radar (SAR) imaging models assume low vehicle speeds relative to wave propagation.
  • Near-range imaging applications present unique challenges due to high relative speeds.
  • Accurate system modeling is crucial for effective inversion and image reconstruction.

Purpose of the Study:

  • To develop a novel system model and inversion technique for airborne synthetic aperture acoustic (SAA) imaging.
  • To accurately represent acoustic interactions at near ranges with high relative speeds.
  • To improve imaging accuracy compared to existing SAR methods.

Main Methods:

  • Developed a system model accounting for vehicle speeds comparable to acoustic wave propagation.

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  • Utilized spectral decomposition of spherical phase functions for wavefront reconstruction.
  • Investigated processing challenges and acoustic FM-CW source selection.

    • Main Results:

    • The proposed SAA system model demonstrates superior accuracy over SAR counterparts.
    • The wavefront reconstruction method effectively processes SAA data.
    • The model's validity is shown for scenarios with high relative speeds.

    Conclusions:

    • The developed SAA system model and inversion provide a more accurate approach for near-range acoustic imaging.
    • This method overcomes limitations of traditional SAR models in high-speed scenarios.
    • The findings have implications for advanced acoustic imaging applications.