(The) Optical Low Angle Pass Filter for High Signal-to-noise Ratio Photoplethysmography Monitoring = 높은 신호 대 잡음비를 갖는 광용적맥파를 위한 저각도 광학 투과 필터

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The photoplethysmography (PPG) signal exhibits the human vascular activity using the parameters extracted from the PPG waveform. However, the reflectance type PPG signal is liable to be distorted by noise. In this work, we present the optical low angle pass filter (OLAPF) for high signal-to-noise ratio photoplethysmography (PPG) monitoring. The highly scattered light, which loses their directionality under the human tissue act as a noise in PPG signal. The OLAPF can cut-off these scattered light using their non-directionality. The OLAPF was designed by the ray-optics analysis and numerical analysis. The fabrication of the OLAPF was done by using guided resist reflow and soft lithography method. To figure out the difference between with and without OLAPF, we made the conventional PPG sensor, which can be changed the glass on the photodetector to the OLAPF. As a result, the in-band noise overlapped the signal bandwidth of 0.5 Hz to 4 Hz with OLAPF is 2 times smaller than without the OLAPF. The low-frequency power spectral density, which has bandwidth of 0 Hz to 0.4 Hz of PPG signal with OLAPF is 3 times smaller than without OLAPF. This device can be applied not only PPG signal but also NIRS to improve the signal resolution.
Advisors
Jeong, Ki-Hunresearcher정기훈researcher
Description
한국과학기술원 :바이오및뇌공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 바이오및뇌공학과, 2017.2,[vii, 51 p. :]

Keywords

Photoplethysmography; Optical Filter; Lithography; Vascular Activity; Signal-to-noise Ratio; 광용적맥파; 광학필터; 리소그래피; 혈관활동; 신호 대 잡음비

URI
http://hdl.handle.net/10203/242989
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675205&flag=dissertation
Appears in Collection
BiS-Theses_Master(석사논문)
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