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Angle-selective optical filter for highly sensitive reflection photoplethysmogram.

Chan-Sol Hwang1, Sung-Pyo Yang1, Kyung-Won Jang1

  • 1Department of Bio and Brain Engineering and KAIST Institute for Health Science and Technology, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea.

Biomedical Optics Express
|October 31, 2017
PubMed
Summary
This summary is machine-generated.

We developed an angle-selective optical filter (ASOF) to improve photoplethysmography (PPG) sensors. This novel filter significantly reduces noise, enabling more sensitive and detailed vascular monitoring.

Keywords:
(120.5240) Photometry(170.3890) Medical optics instrumentation(220.4000) Microstructure fabrication(230.3990) Micro-optical devices

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Area of Science:

  • Biomedical Optics
  • Optical Engineering
  • Materials Science

Background:

  • Photoplethysmography (PPG) sensors are crucial for non-invasive physiological monitoring.
  • Scattered light and noise under human tissue limit the sensitivity and accuracy of PPG signals.
  • Existing filters struggle to effectively mitigate complex optical noise in PPG applications.

Purpose of the Study:

  • To develop and characterize a novel angle-selective optical filter (ASOF) for enhancing the sensitivity of reflection PPG sensors.
  • To investigate the microfabrication process and optical performance of the ASOF.
  • To demonstrate the ASOF's capability in reducing noise and improving PPG signal quality.

Main Methods:

  • Microfabrication of slanted aluminum (Al) micromirror arrays embedded in polymer resin using geometry-guided resist reflow, replica molding, and oblique angle deposition.
  • Characterization of angular transmittance properties of the ASOF.
  • Evaluation of the ASOF's impact on PPG signal noise reduction (in-band and low-frequency).

Main Results:

  • The ASOF effectively blocks scattered light, with precisely controlled angular transmittance based on micromirror angles.
  • For a 30-degree mirror angle, the ASOF accepts light from -90 to +50 degrees, with maximum transmittance at -55 degrees.
  • Demonstrated over a twofold reduction in in-band PPG noise and a threefold reduction in low-frequency noise.
  • Enabled the distinction of the diastolic peak in PPG signals, revealing diverse vascular information.

Conclusions:

  • The developed ASOF significantly enhances the sensitivity of PPG sensors by reducing optical noise.
  • The microfabrication technique offers precise control over optical filtering characteristics.
  • This technology presents a new avenue for advanced PPG monitoring and optical tomography applications.