METHODS AND DEVICES FOR DETECTING INTENSITY OF LIGHT WITH TRANSLUCENT DETECTOR
An optical measurement device includes a light source, a first detector, and a second detector. The light source emits light to a measurement site of a patient and one or more detectors detect the light from the light source. At least a portion of a detector is translucent and the light passes through the translucent portion prior to reaching the measurement site. A detector receives the light after attenuation and/or reflection or refraction by the measurement site. A processor determines a light intensity of the light source, a light intensity through a tissue site, or a light intensity of reflected or refracted light based on light detected by the one or more detectors. The processor can estimate a concentration of an analyte at the measurement site or an absorption or reflection at the measurement site.
1 . (canceled)
2 . A method of determining a physiological parameter using an optical measurement device, the method comprising:
causing a light source to emit light, wherein a first detector positioned along a light path between the light source and a measurement site detects incident light emitted by the light source as it emerges from the light source, wherein at least some light emitted by the light source passes through a portion of the first detector prior to reaching the measurement site;
detecting, using a second detector, attenuated light, the attenuated light having been attenuated by the measurement site;
receiving, using one or more hardware processors, a first signal generated by the first detector, the first signal corresponding to the detected incident light;
receiving, using the one or more hardware processors, a second signal generated by the second detector, the second signal corresponding to the detected attenuated light; and
determining, using the one or more hardware processor, a physiological parameter based at least in part on the first signal and second signal.
3 . The method of claim 2 , wherein a region of the first detector that detects the incident light is different from the portion of the first detector through which light passes to reach the measurement site.
4 . The method of claim 2 , wherein the first signal is indicative of an intensity of the incident light.
5 . The method of claim 2 , the method further comprising determining an intensity of the incident light based at least in part on the first signal.
6 . The method of claim 2 , wherein the physiological parameter corresponds to a blood glucose concentration.
7 . The method of claim 2 , wherein the first detector is proximal to the light source with respect to the measurement site, wherein the measurement site comprises non-biological material.
8 . The method of claim 2 , wherein the first detector is proximal to the light source with respect to the measurement site, wherein the measurement site comprises biological material.
9 . A detector for measuring incident light emitted by a light source, the detector comprising:
a first anti-reflective coating;
a second anti-reflective coating; and
a photodiode positioned between the first anti-reflective coating and second anti-reflective coating, wherein at least a portion of the photodiode is translucent.
10 . The detector of claim 9 , wherein the photodiode is 1-15 nm thick.
11 . The detector of claim 9 , comprising a detecting region configured to detect incident light.
12 . The detector of claim 11 , comprising a translucent region configured to allow passage of incident light through the detector.
13 . The detector of claim 12 , wherein the detecting region is different from the translucent region.
14 . The detector of claim 12 , wherein the detecting region overlaps with the translucent region.
15 . The detector of claim 9 , further comprising a wafer positioned between the photodiode and the second anti-reflective coating.
16 . The detector of claim 15 , wherein the wafer is 1-10 μm thick.
17 . The detector of claim 15 , wherein the wafer is a N-type Indium Phosphide (N—InP) wafer.
18 . An optical measurement device comprising a light source and the detector of claim 9 configured to detect incident light emitted from the light source, wherein the detector is positioned in a light path of the light source.
19 . The optical measurement device of claim 18 , wherein the optical measurement device is configured to measure a physiological parameter, and the detector configured to measure incident light emitted from the light source prior to reaching a measurement site of a patient.
20 . The optical measurement device of claim 19 , wherein the optical measurement device comprising a second detector configured to detect attenuated light, the attenuated light having been attenuated by the measurement site.
21 . The optical measurement device of claim 19 , wherein the detector is configured to detect attenuated light, the attenuated light having been attenuated by the measurement site.