Measurement of pulse wave signals and blood pressure by a plastic optical fiber FBG sensor

Yuki Haseda, Julien Bonefacino, Hwa Yaw Tam, Shun Chino, Shouhei Koyama, Hiroaki Ishizawa

Research output: Journal article publicationJournal articleAcademic researchpeer-review

52 Citations (Scopus)


Fiber Bragg grating (FBG) sensors fabricated in silica optical fiber (Silica-FBG) have been used to measure the strain of human arteries as pulse wave signals. A variety of vital signs including blood pressure can be derived from these signals. However, silica optical fiber presents a safety risk because it is easily fractured. In this research, an FBG sensor fabricated in plastic optical fiber (POF-FBG) was employed to resolve this problem. Pulse wave signals were measured by POF-FBG and silica-FBG sensors for four subjects. After signal processing, a calibration curve was constructed by partial least squares regression, then blood pressure was calculated from the calibration curve. As a result, the POF-FBG sensor could measure the pulse wave signals with an signal to noise (SN) ratio at least eight times higher than the silica-FBG sensor. Further, the measured signals were substantially similar to those of an acceleration plethysmograph (APG). Blood pressure is measured with low error, but the POF-FBG APG correlation is distributed from 0.54 to 0.72, which is not as high as desired. Based on these results, pulse wave signals should be measured under a wide range of reference blood pressures to confirm the reliability of blood pressure measurement uses POF-FBG sensors.

Original languageEnglish
Article number5088
JournalSensors (Switzerland)
Issue number23
Publication statusPublished - 1 Dec 2019


  • Blood pressure
  • Fiber Bragg grating
  • Non-invasive measurement
  • Partial least squares regression
  • Plastic optical fiber
  • Pulse wave signals

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering


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