Wearable device for differential measurement on pulse rate and blood flow

A measurement system adapted to be worn by a user comprising:

• an array of laser diodes configured to generate a light having an initial light intensity and one or more optical wavelengths, wherein the array of laser diodes comprises a plurality of emitters;
• wherein at least a portion of the one or more optical wavelengths is a near-infrared wavelength between 700 nanometers and 2500 nanometers, wherein at least a portion of the array of laser diodes comprises one or more Bragg reflectors, wherein the at least a portion of the array of laser diodes is further configured to be modulated with a pulsed output with a pulse duration of approximately 0.5 to 2 nanoseconds and a pulse repetition rate between about 10 Megahertz and 1 Gigahertz, wherein the array of laser diodes is further coupled to driver electronics;
• a first lens configured to receive at least a portion of the light from the array of laser diodes and configured to direct at least some of the portion of the light from the array of laser diodes to an object;
• a photodiode array, at least one second lens and one or more spectral filters in front of at least a part of the photodiode array, wherein the photodiode array is further coupled to a processor, and wherein the photodiode array comprises a plurality of pixels coupled to CMOS transistors;
• wherein the photodiode array is configured to receive at least a portion of light reflected from the object, and wherein the photodiode array is further configured to be synchronized to the at least a portion of the array of laser diodes comprising one or more Bragg reflectors;
• wherein the processor is configured to perform a time-of-flight measurement based on a time difference between a first time in which the at least a portion of the array of laser diodes generate light and a second time in which the photodiode array receives a received portion of light reflected from the object;
• wherein the processor is further configured to perform the time-of-flight measurement at least in part by measuring a temporal distribution of photons in the received portion of light;
• wherein the measurement system including the processor is configured to be coupled to a first camera configured to be coupled to a third lens and the processor, the first camera configured to capture one or more images including at least a part of the object;
• wherein the processor is configured to combine at least a portion of the one or more images and the at least a portion of the time-of-flight measurement to create a combined portion;
• and
• the processor further being coupled to a second camera, the second camera being configured to be illuminated by one or more light emitting diodes generating incoherent light and being configured to operate in a near-infrared wavelength range, wherein the second camera is configured to at least in part monitor at least one eye of the user.