When photons hit your blood: Laser sensors for advanced cardiovascular monitoring
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Author
Burgat, B.
Theurillat, P.
Farnier, A.
Schaffter, V.
Proença, M.
Renevey, P.
Springmann, V.
Scapuso, N.
Moreira De Sousa, A.
Rusconi, R.
DOI
Abstract
Photoplethysmography (PPG) is a non-invasive optical measurement modality widely used in wearables and medical devices to monitor a variety of vital signs including heart rate, blood oxygenation saturation or blood pressure. However, PPG signals may be limited in elderly individuals and in patients with low perfusion or high arterial stiffness, those who need reliable monitoring the most. In these challenging conditions, techniques such as Laser Doppler Flowmetry (LDF) and speckle contrast imaging can provide complementary information to PPG, potentially supporting more robust blood pressure assessment and enabling exploration of additional vascular biomarkers. We developed an integrated sensing platform combining laser-based sensors with PPG and electrocardiogram (ECG) to capture a broader range of cardiovascular signals. Initial tests at rest and during cuff occlusion show promising results, with speckle-based signals delivering high-quality information related to blood flow, complementing PPG measurements.
Publication Reference
CSEM Scientific and Technical Report 2025, p. 25–26
Year
2025