Multi-stream data collection system for noninvasive measurement of blood constituents
The present disclosure relates to noninvasive methods, devices, and systems for measuring various blood constituents or analytes, such as glucose. In an embodiment, a light source comprises LEDs and super-luminescent LEDs. The light source emits light at least wavelengths of about 1610 nm, about 1640 nm, and about 1665 nm. In an embodiment, the detector comprises a plurality of photodetectors arranged in a special geometry comprising one of a substantially linear substantially equal spaced geometry, a substantially linear substantially non-equal spaced geometry, and a substantially grid geometry.
1. A noninvasive physiological sensor comprising:
a front-end interface comprising:
one or more detectors, each detector including a respective set of photodiodes;
one or more inputs configured to receive signals from respective one or more detectors in the sensor;
a respective two or more transimpedance amplifiers for each respective detector and configured to convert the signals from the respective sets of photodiodes into output signals for each of the respective sets of photodiodes; and
a respective averager, coupled to the respective two or more transimpedance amplifiers for each respective detector, and configured to average the output signals from the respective two or more transimpedance amplifiers into a respective output signal.
2. The noninvasive physiological sensor of claim 1 , wherein each set of photodiodes comprises two photodiodes coupled together.
3. The noninvasive physiological sensor of claim 1 , wherein each set of photodiodes comprises three photodiodes coupled together.
4. The noninvasive physiological sensor of claim 1 , wherein each set of photodiodes comprises four photodiodes coupled together.
5. The noninvasive physiological sensor of claim 1 , wherein each set of photodiodes comprises nine photodiodes coupled together.
6. The noninvasive physiological sensor of claim 1 , wherein each set of photodiodes coupled together provides a detection area of approximately 1 mm 2 .