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1. (WO2017001249) SYSTÈME DE CAPTEUR ET PROCÉDÉ QUI UTILISE DE MULTIPLES CAPTEURS DE PPG
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS:

1. A sensor system, comprising:

a first PPG sensor (20) having a first light source (22) and a first optical detector (24);

a second PPG sensor (30) having a second light source (32) and a second optical detector (34);

a monitoring system (40) adapted to monitor detection of a first optical calibration signal, wherein the first optical calibration signal is adapted to be detected by the first optical detector (24) of the first PPG sensor (20) and is generated by the second light source (32), wherein the monitoring system is adapted to perform time calibration between the first and second PPG sensors.

2. A sensor system as claimed in claim 1, wherein the monitoring system is also adapted to monitor detection of a second optical calibration signal, wherein the second optical calibration signal is adapted to be detected by the second optical detector (34) of the second PPG sensor (30) and is generated by the first light source.

3. A system as claimed in claim 1, wherein the first and second PPG sensors are adapted to be positioned against each other when monitoring detection.

4. A system as claimed in claim 1, comprising a docking station (50), which provides a first optical coupling (52) between the first light source and the second optical detector and a second optical coupling (54) between the second light source and the first optical detector.

5. A system as claimed in claim 4, wherein the docking station (50) comprises optical fibers (52,54) for providing the first and second optical couplings.

6. A system as claimed in claim 1, wherein the first and second PPG sensors each comprise a processor for implementing ambient light compensation by which the optical

detector signal received when the light source is turned off is subtracted from the optical detector signal received when the light source is turned on.

7. A system as claimed in claim 6, wherein the monitoring system is adapted to turn off the ambient light compensation during the time calibration.

8. A pulse delay measurement device, comprising:

a sensor system as claimed in any preceding claim; and

a controller (40) for obtaining PPG signals from the first and second PPG sensors, and deriving a pulse delay (42) using the timing calibration.

9. A sensor calibration method for calibrating first and second PPG sensors, the first PPG sensor (20) having a first light source (22) and a first optical detector (24) and the second PPG sensor (30) having a second light source (32) and a second optical detector (34), the method comprising:

generating a first optical calibration signal using the second light source; optically coupling the second light source to the first optical detector; and performing time calibration between the first and second PPG sensors, wherein the optical couplings are achieved by:

positioning the first and second PPG sensors (20,30) against each other; or

placing the first and second PPG sensors (20,30) on a docking station (50), which provides an optical coupling (52) between the second light source and the first optical detector.

10. A sensor calibration method as claimed in claim 9, further comprising:

generating a second optical calibration signal using the first light source; and optically coupling the first light source to the second optical detector, wherein placing the first and second PPG sensors (20,30) on a docking station

(50), also provides an optical coupling (52) between the first light source and the second optical detector

11. A pulse delay sensing method comprising:

performing sensing calibration using the method as claimed in claim 9 or 10;

and

after the sensing calibration, obtaining PPG signals from the first and second PPG sensors, and deriving a pulse delay.

12. A computer program product comprising computer program code means which is adapted, when run on a computer, to perform the method of claim 9, 10 or 11.