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Related Concept Videos

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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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

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Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
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Related Experiment Video

Updated: Jun 25, 2025

Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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Periodic open and closed resonators as a biosensor using two computational methods.

Zaky A Zaky1, M Al-Dossari2, Ahmed S Hendy3

  • 1TH-PPM Group, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62521, Egypt. zaky.a.zaky@science.bsu.edu.eg.

Scientific Reports
|May 24, 2024
PubMed
Summary

This study introduces a novel sensor for measuring carbon dioxide in exhaled breath, offering insights into respiratory and metabolic health. The developed resonator sensor demonstrates high sensitivity and efficiency for disease diagnostics.

Keywords:
Acoustic wavesCarbon dioxide concentrationGas sensorParallel resonatorsPhononic crystal

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Area of Science:

  • Biomedical Engineering
  • Sensor Technology
  • Respiratory Diagnostics

Background:

  • Volatile compounds in exhaled breath provide vital health information, including respiratory and metabolic status.
  • Carbon dioxide levels in breath are key indicators of metabolic rate and overall health.

Purpose of the Study:

  • To develop and evaluate a novel periodic open and closed resonator sensor for precise carbon dioxide measurement in dry exhaled breath.
  • To assess the sensor's suitability for diagnosing respiratory diseases.

Main Methods:

  • Utilized transfer matrix and green methods to simulate acoustic wave interaction with the proposed resonator sensor.
  • Analyzed band gaps and transmittance spectra to validate sensor performance.

Main Results:

  • The sensor achieved a sensitivity of , a figure of merit of 10,254 , a detection limit of , and a quality factor of .
  • The simulation results showed good agreement between the green and transfer matrix methods.
  • The sensor design demonstrated high efficiency, indicating its potential for disease diagnostics.

Conclusions:

  • The proposed resonator sensor is effective for measuring carbon dioxide in exhaled breath.
  • The sensor shows promise as a diagnostic tool for various diseases, including chronic obstructive pulmonary disease.
  • Cylindrical-adapted sensors are crucial for simultaneous fluid transport and detection in medicine, industry, and biology.