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First page or project page of “Wearable, compact photo- and speckle plethysmography device for continuous non-invasive vital signs monitoring” (opens in a new tab)

Paperdoi:10.1117/12.3001630

Wearable, compact photo- and speckle plethysmography device for continuous non-invasive vital signs monitoring

Venue listed2024Added Oct 29, 2026

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Authors: Lena Schnitzler, Jorge Herranz Olazábal, Ilde Rosa Lorato, Marc Verhoeven, Evelien Hermeling, Jesse Kling (Imec the Netherlands)

Optical Diagnostics and Sensing: Toward Point-of-Care Diagnostics 48:21, 2024

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First page or project page of “Wearable, compact photo- and speckle plethysmography device for continuous non-invasive vital signs monitoring” (opens in a new tab)

TL;DR

Researchers at imec built a compact wearable that pairs a laser diode with a small camera to record PPG and speckle plethysmography (SPG) at the same time, with real-time display and software-tunable settings. It is presented as a first step toward a fully integrated, low-cost SPG/PPG wearable for continuous vital-sign monitoring.

  • Form factor: other

Abstract

Continuous real-time monitoring of hemodynamic variables has become very relevant in modern medicine not only in clinical settings, but also for consumer wearables. Wearable technologies allow for vital sign monitoring (VSM) and help to promptly react in urgent situations. Photoplethysmography (PPG), an optical method based on absorption changes, is a well-known technique for non-invasive monitoring of cardiovascular biomarkers. However, PPG quality can be significantly compromised by skin melanin content, low perfusion, and ambient light changes. Unreliability under these conditions could potentially lead to severe consequences if threatening events remain undetected. Speckle Plethysmography (SPG) is based on the measurement of speckle variations and shows a robust signal quality independent of skin melanin content and ambient light, which indicates that SPG is a more reliable technology for continuous VSM. We present a compact, wearable device for simultaneous PPG and SPG VSM. The system consists of a laser diode illuminating the tissue, and a camera that captures the reflected light, forming a speckle pattern. Additionally, an acquisition platform (portable computer) is used to send the information wirelessly to a computer. The system allows for software-controlled tuning of parameters to optimize signal quality. SPG and PPG are calculated from the images, visualized in real-time and recorded to analyze cardiovascular biomarkers such as heart rate, heart rate variability and others. This compact wearable device is the first step towards full SPG/PPG sensor integration to enable robust, low-cost, wearable, non-invasive VSM.

Verbatim from Semantic Scholar (opens in a new tab) · Abstract via Semantic Scholar; © the authors/publisher

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Tasks & signals

Signals

PPGSPG

Keywords

Speckle PlethysmographyWearableLaser DiodeCameraImecHardware

How it works

How Method works: Setup → Method → TargetSetup: Signals (SPG, PPG); Wavelengths (laser diode (λ not in abstract)); Form factor (other). Method: Method.SetupSignals: SPG, PPGSignalsSPG, PPGWavelengths: laser diode (λ not in abstract)Wavelengthslaser diode (λ not in abstract)Form factor: otherForm factorotherMethodMethod
Wavelengths
laser diode (λ not in abstract)

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Schnitzler, L., Olazábal, J. H., Lorato, I. R., Verhoeven, M., Hermeling, E., & Kling, J. (2024). Wearable, compact photo- and speckle plethysmography device for continuous non-invasive vital signs monitoring. Optical Diagnostics and Sensing: Toward Point-of-Care Diagnostics , 2024, 48, 21. https://doi.org/10.1117/12.3001630
Schnitzler, Lena, Jorge Herranz Olazábal, Ilde Rosa Lorato, Marc Verhoeven, Evelien Hermeling, and Jesse Kling. 2024. "Wearable, compact photo- and speckle plethysmography device for continuous non-invasive vital signs monitoring." Optical Diagnostics and Sensing: Toward Point-of-Care Diagnostics , 2024 48: 21. https://doi.org/10.1117/12.3001630.
Schnitzler, L., Olazábal, J. H., Lorato, I. R., Verhoeven, M., Hermeling, E. and Kling, J. (2024) 'Wearable, compact photo- and speckle plethysmography device for continuous non-invasive vital signs monitoring', Optical Diagnostics and Sensing: Toward Point-of-Care Diagnostics , 2024, 48, p. 21. doi: 10.1117/12.3001630.
Schnitzler, Lena, et al. "Wearable, compact photo- and speckle plethysmography device for continuous non-invasive vital signs monitoring." Optical Diagnostics and Sensing: Toward Point-of-Care Diagnostics , 2024, vol. 48, 2024, p. 21. https://doi.org/10.1117/12.3001630.
L. Schnitzler, J. H. Olazábal, I. R. Lorato, M. Verhoeven, E. Hermeling, and J. Kling, "Wearable, compact photo- and speckle plethysmography device for continuous non-invasive vital signs monitoring," Optical Diagnostics and Sensing: Toward Point-of-Care Diagnostics , 2024, vol. 48, p. 21, 2024, doi: 10.1117/12.3001630.
@article{schnitzler2024wearable,
  title         = {{Wearable, compact photo- and speckle plethysmography device for continuous non-invasive vital signs monitoring}},
  author        = {Schnitzler, Lena and Olazábal, Jorge Herranz and Lorato, Ilde Rosa and Verhoeven, Marc and Hermeling, Evelien and Kling, Jesse},
  year          = {2024},
  journal       = {Optical Diagnostics and Sensing: Toward Point-of-Care Diagnostics , 2024},
  volume        = {48},
  pages         = {21},
  doi           = {10.1117/12.3001630}
}

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