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Chip-scale optical airflow sensor.

Yumeng Luo1, Xiaoshuai An1, Liang Chen1

  • 1School of Microelectronics, Southern University of Science and Technology, Shenzhen, 518055 China.

Microsystems & Nanoengineering
|January 20, 2022
PubMed
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A novel miniaturized optical airflow sensor uses a Gallium Nitride (GaN) chip and PDMS membrane for fast, wide-range detection. This compact device shows promise for industrial, biomedical, and environmental airflow monitoring.

Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Airflow sensors are critical for industrial, biomedical, and environmental monitoring.
  • There is a need for compact, rapid-response sensors with a wide measurement range for in situ airflow detection.

Purpose of the Study:

  • To develop a miniaturized optical airflow sensor with enhanced performance.
  • To demonstrate the sensor's capability for in situ airflow monitoring and potential applications.

Main Methods:

  • Fabrication of a miniaturized optical airflow sensor using a Gallium Nitride (GaN) chip and a flexible Polydimethylsiloxane (PDMS) membrane.
  • Integration of light emission and photodetection onto a single GaN chip.
  • Utilizing a droplet-based molding process for the PDMS membrane to convert airflow into optical reflectance changes.
Keywords:
Electrical and electronic engineeringOptical sensors

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Main Results:

  • The sensor achieved a wide measurement range, detecting airflow rates up to 53.5 m/s.
  • Demonstrated a fast response time of 12 ms.
  • Successfully monitored airflow without external light coupling components.

Conclusions:

  • The developed miniaturized optical airflow sensor offers a promising solution for various applications.
  • The sensor's compact design, fast response, and wide measurement range make it suitable for in situ monitoring.
  • Potential applications include industrial processes, environmental monitoring, and biomedical uses like human breathing detection.