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Related Concept Videos

Design Example01:23

Design Example

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Sound Waves: Resonance01:14

Sound Waves: Resonance

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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Perception of Sound Waves01:01

Perception of Sound Waves

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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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.
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Related Experiment Video

Updated: Mar 26, 2026

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
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Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

Published on: January 29, 2013

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Ringing phenomenon based whispering-gallery-mode sensing.

Ming-Yong Ye1, Mei-Xia Shen1, Xiu-Min Lin1

  • 1Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, College of Physics and Energy, Fujian Normal University, Fuzhou 350007, China.

Scientific Reports
|January 23, 2016
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Summary
This summary is machine-generated.

Whispering-gallery-mode (WGM) microresonators enable highly sensitive sensing. Researchers demonstrate a novel WGM sensing method utilizing the ringing phenomenon for faster, more stable measurements, overcoming laser wavelength drift noise.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Whispering-gallery-mode (WGM) microresonators are crucial for highly sensitive sensing applications.
  • Traditional WGM sensing relies on slow laser sweeps and fiber tapers.
  • Fast laser sweeps over high-Q WGMs induce a ringing phenomenon, typically used for Q-factor and mode-coupling measurements.

Purpose of the Study:

  • To experimentally demonstrate a novel WGM sensing approach based on the ringing phenomenon.
  • To show that this new method offers significantly reduced sensing times.
  • To prove the robustness of this sensing technique against laser wavelength drift noise.

Main Methods:

  • Utilizing the ringing phenomenon observed during fast laser sweeps over high-Q WGMs.
  • Experimental setup involving WGM microresonators and tunable continuous-wave lasers.
  • Analysis of the ringing phenomenon for sensing applications.

Main Results:

  • Successful experimental demonstration of WGM sensing using the ringing phenomenon.
  • Achieved sensing in a considerably shorter timeframe compared to conventional methods.
  • Demonstrated immunity to noise arising from laser wavelength drift.

Conclusions:

  • The ringing phenomenon in WGM microresonators can be effectively utilized for sensing.
  • This novel approach provides a faster and more stable alternative for WGM sensing.
  • The method offers advantages in overcoming environmental noise and improving measurement efficiency.