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Related Concept Videos

Sleep Apnea01:21

Sleep Apnea

Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...

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Flying Insect Detection and Classification with Inexpensive Sensors
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A Sleep Sensor Made with Electret Condenser Microphones.

Teru Kamogashira1, Tatsuya Yamasoba2, Shu Kikuta3

  • 1Department of Otolaryngology and Head and Neck Surgery, Faculty of Medicine, University of Tokyo, Tokyo 113-8655, Japan.

Clocks & Sleep
|June 25, 2025
PubMed
Summary

A new portable sleep sensor uses an inexpensive microphone to monitor breathing during sleep. This cost-effective device offers a convenient alternative to traditional methods for diagnosing sleep disorders like sleep apnea.

Keywords:
electret condenser microphoneextremely low frequencyflow measurementhome sleep apnea testinfrasoundobstructive sleep apneasleep-disordered breathing

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Area of Science:

  • Biomedical Engineering
  • Sleep Medicine
  • Sensor Technology

Background:

  • Respiratory monitoring is crucial for sleep quality assessment and diagnosing sleep disorders like sleep apnea syndrome.
  • Traditional methods (e.g., polysomnography) are expensive, complex, and limited to clinical settings, hindering widespread screening.
  • There is a need for accessible, cost-effective, and portable solutions for respiratory monitoring.

Purpose of the Study:

  • To develop a portable, wireless sleep sensor for non-invasive respiratory monitoring.
  • To utilize an electret condenser microphone (ECM) for cost-effective airflow measurement.
  • To enable convenient and extensive screening for sleep-related breathing disorders.

Main Methods:

  • Developed a portable sensor using an electret condenser microphone (ECM) for nasal airflow measurement.
  • Implemented constant current circuits for ECM biasing and optimized circuit constants.
  • Integrated XBee wireless communication module (ZigBee standard) for data transmission.
  • Powered the device with batteries, achieving ~50 hours of uptime, ±50 Pa pressure range, and 20 Hz sampling.

Main Results:

  • The customized ECM configuration effectively detects subtle airflow changes related to breathing patterns.
  • The wireless module ensures portability, minimal invasiveness, and user comfort during sleep.
  • The sensor provides real-time respiratory data with practical specifications for extended monitoring.

Conclusions:

  • The developed portable wireless sensor is a practical and efficient solution for respiratory monitoring outside clinical settings.
  • This technology facilitates accessible and cost-effective screening for sleep disorders.
  • It offers a user-friendly alternative for continuous sleep-related breathing assessment.