Non-invasive indoor activity monitoring using photonic based accelerometers

Ana Catarina Nepomuceno, Nélia Alberto, Paulo André, Ayman Radwan, Paulo Antunes, M. Fátima Domingues

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

1 Scopus citations


In this work, a solution to monitor users' activity within an indoor scenario is proposed. It is based on non-wearable and non-invasive sensing, and it is specially fitted for the elders' home monitoring. The localization of a person is estimated through an optical sensing network that detects the floor vibration produced by the footstep when walking. Optical fiber Bragg sensors are integrated within high sensitive accelerometers to detect such vibration. Three similar accelerometers were developed from which sensitivities of 269 pm/G, 225 pm/G, and 209 pm/G were found. Allied to vibration detection, an algorithm is employed to retrieve one's position from the data. In preliminary localization tests, the system has demonstrated an accuracy under 5 cm over a 3.2 m2 detection area, proving itself to be a promising solution for the targeted application.

Original languageBritish English
Title of host publicationOptical Sensing and Detection VII
EditorsFrancis Berghmans, Ioanna Zergioti
ISBN (Electronic)9781510651548
StatePublished - 2022
EventOptical Sensing and Detection VII 2022 - Virtual, Online
Duration: 9 May 202215 May 2022

Publication series

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


ConferenceOptical Sensing and Detection VII 2022
CityVirtual, Online


  • Accelerometer
  • elder's monitoring
  • fiber Bragg gratings
  • indoor positioning


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