A ballistocardiography monitor based on optical fiber interferometer

Shuyang Chen, Fengze Tan, Weimin Lyu, Changyuan Yu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


Ballistocardiography (BCG) is a non-invasive method to detect the heartbeat signal, which reflects the body recoils introduced by cardiac ejection. Compared with traditional heartbeat monitors, such as Electrocardiography (ECG), the BCG detection method can acquire heartbeat signals without any wearable devices, which is user-friendly. The device can be integrated into a cushion, which is convenient for users to monitor the heartbeat in long-term. In this paper, a BCG monitor based on the Mach-Zehnder interferometer (MZI) with a new phase modulation method is demonstrated. A low-cost and compact phase shifter is introduced to solve the problem of signal fading in the fiber-optic interferometer. The baseline drift produced from breath and noise can be removed by the phase modulation and accuracy BCG signal can be detected in the sitting position. Compared with existing BCG monitors, such as accelerometer-based and bathroom scales-based, our optical fiber interferometer-based BCG monitor has many merits including sensitivity, stable, and immune to electromagnetic interference (EMI). In conclusion, the BCG monitor based on optical fiber sensor has great potential in the long-term and real-time heartbeat monitoring.

Original languageEnglish
Title of host publicationOptoelectronic Devices and Integration IX
EditorsXuping Zhang, Baojun Li, Changyuan Yu, Xinliang Zhang
ISBN (Electronic)9781510639096
Publication statusPublished - Oct 2020
EventOptoelectronic Devices and Integration IX 2020 - Virtual, Online, China
Duration: 12 Oct 202016 Oct 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceOptoelectronic Devices and Integration IX 2020
CityVirtual, Online


  • Ballistocardiography monitor
  • Mach-Zehnder interferometer
  • Optical fiber sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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