A new reflective PPG LED-PD sensor module for cuffless blood pressure measurement at wrist artery

Yung Hua Kao, Paul C.-P. Chao*, Yueh Hung, Chin Long Wey

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Scopus citations


A new reflective photoplethysmography (PPG) sensor module is developed with effort to optimize the distances between light emitting diodes (LEDs) and a photodiode (PD) in the proposed module for precision cuffless, non-invasive blood pressure (BP) measurement based on PPG of wrist artery. In the developed module, four LEDs with different wavelengths of 530 nm, 660 nm, 850 nm, 940 nm are included. A new optical simulation model based on Beer-Lambert's law is established, which include LEDs, PD, epidermis, dermis, subcutaneous tissue and pulsating arteries. The distances between LEDs and PD are optimized to maximize the signal-to-noise ratio of the PPG received by PD for higher precision of the predicted BPs from arterial PPG. The results show that the optimal distance is around 2 mm for detecting arterial pulsation by wavelengths of 850 and 950 nm. Experiments were also conducted, showing favorable results of BP measurements.

Original languageEnglish
Title of host publicationIEEE SENSORS 2017 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9781509010127
StatePublished - 21 Dec 2017
Event16th IEEE SENSORS Conference, ICSENS 2017 - Glasgow, United Kingdom
Duration: 30 Oct 20171 Nov 2017

Publication series

NameProceedings of IEEE Sensors
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229


Conference16th IEEE SENSORS Conference, ICSENS 2017
CountryUnited Kingdom


  • Beer-Lambert's law
  • Blood Pressure (BP) Measurement
  • PPG Sensor

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