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Related Concept Videos

Echo01:06

Echo

589
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,...
589
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

410
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
410

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Research Progress in Distributed Acoustic Sensing Techniques.

Ying Shang1, Maocheng Sun1, Chen Wang1

  • 1Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250101, China.

Sensors (Basel, Switzerland)
|August 26, 2022
PubMed
Summary
This summary is machine-generated.

Distributed acoustic sensing (DAS) offers long-distance detection with high resolution. This review covers DAS advancements, technologies, and applications in security, monitoring, and exploration.

Keywords:
Rayleigh backscatteringdistributed acoustic sensingoptical fiber sensoroptical time domain reflectometryperformance boost

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Area of Science:

  • Optics and Photonics
  • Sensing Technologies

Background:

  • Distributed acoustic sensing (DAS) utilizes Rayleigh scattering for acoustic detection.
  • DAS offers advantages like long-distance sensing, high spatial resolution, and wide bandwidth.

Purpose of the Study:

  • To systematically review recent advancements in DAS techniques.
  • To discuss pivotal technologies, challenges, and solutions in DAS.

Main Methods:

  • Review of research progress and operation principles of DAS.
  • Analysis of key technologies including polarization fading, coherent fading, spatial resolution, frequency response, signal-to-noise ratio, and sensing distance.

Main Results:

  • Comprehensive overview of DAS technologies and their performance metrics.
  • Detailed examination of various applications, including perimeter security, earthquake monitoring, energy exploration, underwater positioning, and railway monitoring.

Conclusions:

  • DAS technology has seen significant advancements.
  • Future developments in DAS hold potential for expanded applications and improved performance.