Fitbit, Inc.

Kyle P Nadeau

Peter W Richards

Paul Francis Stetson

Chris Hanrahan Sarantos

Javier L Prieto

Kevin Pu Weekly

Aniket Sanjay Deshpande

Julian Maclaren

Vahe Tshitoyan

Christopher Hanrahan Sarantos

Systems, devices, and methods for tracking one or more physiological metrics (e.g., heart rate, blood oxygen saturation, and the like) of a user are described. For example, one or more light sources and one or more light detectors may be positioned on a wearable device such that light can be emitted towards the user's skin and further such that light reflected back to the wearable device can be measured and used to generate values for the one or more physiological metrics.

Multiple source-detector pair photoplethysmography (PPG) sensor

Structures and techniques are provided for shaping or steering a light field for an optical biological parameter sensor such that the light is partially or wholly collimated and enters a person's skin at an oblique angle to the person's skin such that the light has a direction component oriented towards or away from a photodetector of the optical biological parameter sensor.

Light field management in an optical biological parameter sensor

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San Francisco, CA, United States of America

Kyle P Nadeau