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Flying Insect Detection and Classification with Inexpensive Sensors
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An inexpensive sensor for noise.

Laura Hallett1, Marcus Tatum2, Geb Thomas3

  • 1a Department of Occupational and Environmental Health , The University of Iowa , Iowa City , Iowa.

Journal of Occupational and Environmental Hygiene
|February 9, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed an affordable noise sensor for workplace hazard monitoring. The inexpensive sensors accurately measure sound levels, enabling cost-effective noise sensor networks.

Keywords:
Hazardnetwork sensornoisesoundsound pressure level

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Area of Science:

  • Occupational Health and Safety
  • Acoustics Engineering
  • Sensor Technology

Background:

  • Workplace noise is a significant hazard, but expensive equipment limits widespread monitoring.
  • Direct-reading noise instruments are costly, hindering the development of comprehensive sensor networks.

Purpose of the Study:

  • To develop an affordable noise sensor (under $100) capable of measuring A-weighted sound pressure levels.
  • To evaluate the accuracy of these sensors against a Type 2 sound level meter (SLM).
  • To assess the feasibility of using these sensors in an inexpensive noise monitoring network.

Main Methods:

  • Development of a compact noise sensor utilizing an electret condenser microphone, amplifier, and microcontroller.
  • Laboratory evaluation of 50 sensors across various sound levels (ambient to 94 dBA) using pink noise and a calibrator.
  • Comparison of sensor readings with a Type 2 sound level meter (SLM).

Main Results:

  • Ninety-four percent of the developed noise sensors (46 out of 50) met the ±2 dBA accuracy requirement compared to the SLM.
  • Sensor accuracy improved with increasing sound levels, with bias decreasing significantly from ambient conditions to 94 dBA.
  • Overall bias was minimal (0.83%) within the 75-94 dBA range.

Conclusions:

  • The developed inexpensive noise sensors are accurate and reliable for workplace noise monitoring.
  • These sensors offer a cost-effective solution for establishing stationary sensor networks for continuous noise assessment.
  • The technology is adaptable for various applications, including industrial noise monitoring in manufacturing environments.