Improvement of the contrast of photoplethysmographic measurements for the monitoring of physiological parameters

Photoplethysmography (PPG) is a non-invasive optical technique for detecting temporal variations in blood volume in tissues. PPG is used to monitor physiological parameters such as heart rate, pulse oximetry and blood pressure. PPG is a widely used method in physiological measurement systems, whether for consumer connected objects (smart watches, smartphones) or medical systems (oximeters). Even if these objects have invaded the market, the performances in terms of accuracy and robustness of the measurement are disappointing, and very rarely meet the medical requirements. This is why it seems essential to develop new acquisition methods to improve the contrast of PPG measurements. The objective of the thesis we propose is to better extract the component of interest of the PPG signal by playing on the optical contrasts by shaping the illumination and the detection used (spectrum, polarization, coherence).

The selected PhD student will have strong skills in instrumental optics and physics and basic knowledge in data processing and modeling. Knowledge in biophotonics is desirable.

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