Wearable device coupled to time-of-flight imaging system

An optical system, comprising:

• a wearable device for measuring one or more physiological parameters, the wearable device adapted to be placed on a wrist or an ear of a user, including a light source comprising a plurality of light emitting diodes that are configured to generate an output optical light having one or more optical wavelengths;
• the wearable device comprising one or more lenses configured to receive at least a portion of the output optical light and to deliver a lens output light to tissue;
• the wearable device further comprising a detection system configured to receive at least a portion of the lens output light reflected from the tissue and to generate an output signal having a signal-to-noise ratio, wherein the detection system is configured to be synchronized to the light source;
• wherein the detection system comprises a plurality of detectors that are spatially separated from each other, and wherein at least one analog to digital converter is coupled to at least one of the spatially separated detectors;
• wherein the output signal is indicative of one or more of the physiological parameters;
• the wearable device configured to increase the signal-to-noise ratio by increasing light intensity of at least one of the plurality of light emitting diodes from an initial light intensity;
• and
• the detection system further configured to:
• generate a first signal responsive to light received while the light emitting diodes are off,
• generate a second signal responsive to light received while at least one of the light emitting diodes is on, and
• increase the signal-to-noise ratio by comparing the first signal and the second signal;
• the wearable device further coupled to an imaging system for optically detecting the user, the imaging system comprising:
• a laser diode configured to be pulsed and to generate laser diode generated light having a wavelength, wherein the wavelength is a near-infrared wavelength between 700 nanometers and 2500 nanometers, and wherein the laser diode comprises one or more Bragg reflectors;
• at least a portion of the laser diode generated light configured to be directed to the user;
• the imaging system further comprising a second plurality of detectors that receive at least a fraction of the laser diode generated light reflected from the user;
• and
• wherein the imaging system is configured to perform a time-of-flight measurement by measuring a time difference between the laser diode generated light and the at least a fraction of the laser diode generated light reflected from the user.

An optical system, comprising:

• a wearable device for measuring one or more physiological parameters, the wearable device adapted to be placed on a wrist or an ear of a user, including a light source comprising a plurality of light emitting diodes that are configured to generate an output optical light having one or more optical wavelengths;
• the wearable device comprising one or more lenses configured to receive at least a portion of the output optical light and to deliver a lens output light to tissue;
• the wearable device further comprising a detection system configured to receive at least a portion of the lens output light reflected from the tissue and to generate an output signal having a signal-to-noise ratio, wherein the detection system is configured to be synchronized to the light source;
• wherein the detection system comprises a plurality of detectors that are spatially separated from each other, and wherein at least one analog to digital converter is coupled to at least one of the spatially separated detectors;
• wherein the output signal is indicative of one or more of the physiological parameters;
• the wearable device configured to increase the signal-to-noise ratio by increasing light intensity of at least one of the plurality of light emitting diodes from an initial light intensity;
• and
• the detection system further configured to:
• generate a first signal responsive to light received while the light emitting diodes are off,
• generate a second signal responsive to light received while at least one of the light emitting diodes is on, and
• increase the signal-to-noise ratio by comparing the first signal and the second signal;
• the wearable device further configured to be coupled to an imaging system for remote sensing of the user, the imaging system comprising:
• a laser diode configured to be pulsed and to generate light having a wavelength, wherein the wavelength is a near-infrared wavelength between 700 nanometers and 2500 nanometers, and wherein the laser diode comprises one or more Bragg reflectors;
• at least a portion of the laser diode generated light configured to be directed to the user;
• the imaging system further comprising a second plurality of detectors that receive at least a fraction of the laser diode generated light reflected from the user;
• and
• wherein the imaging system is configured to perform a time-of-flight measurement by measuring a time difference between the laser diode generated light and the at least a fraction of the laser diode generated light reflected from the user.