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Related Concept Videos

Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
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Reflection of Waves

When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.

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Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces
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Published on: July 26, 2016

Optical Bragg imaging of acoustic fields after reflection.

Nico F Declercq1, Michael S McPherson, Mack A Breazeale

  • 1Laboratory for Ultrasonic Nondestructive Evaluation, UMI Georgia Tech, CNRS 2958, Georgia Institute of Technology, George W Woodruff School of Mechanical Engineering, 57070 Metz, France. nico.declercq@me.gatech.edu

The Journal of the Acoustical Society of America
|June 17, 2010
PubMed
Summary

This study introduces a novel reflection-based acoustic Bragg imaging technique. This method overcomes limitations of traditional methods, enabling new nondestructive testing applications in industry and medicine.

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Area of Science:

  • Acoustics
  • Optics
  • Materials Science

Background:

  • Bragg diffraction principles apply to both X-rays and visible light interacting with periodic structures.
  • Acoustic Bragg imaging uses ultrasonic fields to diffract light, visualizing object structures.
  • High-frequency ultrasound (25-30 MHz) causes significant attenuation, limiting traditional acoustic Bragg imaging in nondestructive testing (NDT).

Purpose of the Study:

  • To present a reflection-based acoustic Bragg imaging technique.
  • To explore potential industrial and biomedical NDT applications of this new method.

Main Methods:

  • Investigated a reflection-based approach to acoustic Bragg imaging.
  • Analyzed the feasibility of imaging through ultrasonic fields in a reflective configuration.

Main Results:

  • The reflection-based method offers a potential solution to overcome ultrasonic attenuation issues.
  • This technique may enable NDT applications where traditional transmission-based methods fail.

Conclusions:

  • Reflection-based acoustic Bragg imaging presents a promising advancement for NDT.
  • This technique could expand the use of acoustic Bragg imaging in industrial and biomedical fields.