Optical perspiration sensor using frustrated total internal reflection
AssigneeIntel Corporation
InventorsKyu Hyun Kim, David N. Hutchison
Life of this patent
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Abstract
Systems and methods may provide for receiving an electrical measurement signal from a first photodetector coupled to a first waveguide and determining a total intensity level of reflected light in the first waveguide based on the electrical measurement signal. Additionally, a perspiration level of skin in contact with the first waveguide may be determined based on the total intensity level of the reflected light in the first waveguide. In one example, an electrical control signal is received from a second photodetector coupled to a second waveguide that is physically isolated from the skin, wherein the total intensity level of the reflected light in the first waveguide is determined further based on the electrical control signal.
Claims20
A system comprising:
- a battery to supply power to the system;
- an enclosure that houses the system, the enclosure having a wearable form factor and surfaces defining an aperture;
- a first waveguide, wherein the aperture of the enclosure exposes at least one surface of the first waveguide;
- a first photodetector coupled to the first waveguide;
- a measurement stage to receive an electrical measurement signal from the first photodetector;
- a second waveguide;
- a second photodetector coupled to the second waveguide;
- a control stage coupled to the second photodetector, the control stage to receive an electrical control signal from the second photodetector;
- an intensity quantifier coupled to the measurement stage and to the control stage, the intensity quantifier to determine a total intensity level of reflected light in the first waveguide based on the electrical measurement signal and on the electrical control signal;
- and
- a perspiration quantifier coupled to the intensity quantifier, the perspiration quantifier to determine a perspiration level of skin in contact with the first waveguide based on the total intensity level of the reflected light.
A method comprising:
- receiving an electrical measurement signal from a first photodetector coupled to a first waveguide and an electrical control signal from a second photodetector coupled to a second waveguide;
- determining a total intensity level of reflected light in the first waveguide based on the electrical measurement signal and on the electrical control signal;
- and
- determining a perspiration level of skin in contact with the first waveguide based on the total intensity level of the reflected light.
At least one non-transitory computer readable storage medium comprising a set of instructions which, when executed by a computing system, cause the computing system to:
- receive an electrical measurement signal from a first photodetector coupled to a first waveguide and an electrical control signal from a second photodetector coupled to a second waveguide;
- determine a total intensity level of reflected light in the first waveguide based on the electrical measurement signal and on the electrical control signal;
- and
- determine a perspiration level of skin in contact with the first waveguide based on the total intensity level of the reflected light.
An apparatus comprising:
- a measurement stage to receive an electrical measurement signal from a first photodetector coupled to a first waveguide;
- a control stage to receive an electrical control signal from a second photodetector coupled to a second waveguide;
- an intensity quantifier coupled to the measurement stage and to the control stage, the intensity quantifier to determine a total intensity level of reflected light in the first waveguide based on the electrical measurement signal and on the electrical control signal;
- and
- a perspiration quantifier coupled to the intensity quantifier, the perspiration quantifier to determine a perspiration level of skin in contact with the first waveguide based on the total intensity level of the reflected light.
Dependencies are inferred from the claim text.