System and method for a self-calibrating non-invasive sensor
View Patent ↗A non-invasive emitter-photodiode sensor which is able to provide a data-stream corresponding to the actual wavelength of light emitted thereby allowing calibration of the sensor signal processing equipment and resulting in accurate measurements over a wider variation in emitter wavelength ranges.
1. A sensor system comprising:
a probe comprising a light source and a sensor, the sensor having a probe calibration output and a calibrated probe output, wherein the probe outputs are responsive to incident light radiation received from the light source to produce signals proportional to an amplitude and a centroid wavelength of the incident light, and the probe calibration output is generated continuously while taking a physiological measurement;
a calibration circuit in signal communication with the probe and comprising an electronic calibration output responsive to the probe calibration output, and a calibrated electronic output responsive to the calibrated probe output;
a controller in signal communication with the calibration circuit and comprising a lookup table having a wavelength value output responsive to the electronic calibration output and the calibrated electronic output, wherein the wavelength value output is determined in real-time and is then used to correct physiological data derived from the signal proportional to the amplitude of the incident light; and,
a measuring device comprising an output generated in response to the wavelength value output.
2. The sensor system of claim 1 , wherein the physiological measurement and the output of the measuring device is oxygen saturation within blood.
3. The sensor system of claim 1 , further comprising software that operates on the controller.
4. The sensor system of claim 3 , the software comprising instructions for compensating for wavelength variation of the incident light radiation caused by changes in temperature.
5. The sensor system of claim 1 , wherein the incident light radiation is coherent.
6. A sensor system comprising:
a probe comprising a light source and a sensor, the sensor having a probe calibration output and a calibrated probe output, wherein the probe outputs are responsive to incident light radiation received from the light source to produce signals proportional to an amplitude and a centroid wavelength of the incident light, and the probe calibration output is generated continuously while taking a physiological measurement;
a calibration circuit in signal communication with the probe and comprising an electronic calibration output responsive to the probe calibration output, and a calibrated electronic output responsive to the calibrated probe output;
a controller in signal communication with the calibration circuit and comprising a software-based logic responsive to the electronic calibration output and the calibrated electronic output to produce a wavelength value output is then used to correct physiological data derived from the signal proportional to the amplitude of the incident light; and,
a measuring device comprising an output generated in response to the wavelength value output.
7. The sensor system of claim 6 , wherein the physiological measurement and the output of the measuring device are oxygen saturation within blood, cardiac output, blood pressure, or vital signs.
8. The sensor system of claim 6 , further comprising software that operates on the controller.
9. The sensor system of claim 8 , the software comprising instructions for compensating for wavelength variation of the incident light radiation caused by changes in temperature.
10. The sensor system of claim 6 , wherein the incident light radiation is coherent.
11. A sensor system comprising:
a probe comprising a light source and a sensor, the sensor having a probe calibration output and a calibrated probe output, wherein the probe outputs are responsive to incident light radiation received from the light source to produce signals proportional to an amplitude and a centroid wavelength of the incident light, and the probe calibration output is generated continuously while taking a physiological measurement;
a calibration circuit in signal communication with the probe and comprising an electronic calibration output responsive to the probe calibration output, and a calibrated electronic output responsive to the calibrated probe output;
a controller in signal communication with the calibration circuit and comprising logic responsive to the electronic calibration output to provide an output to adjust light source temperature and to produce a wavelength value output that is determined in real-time and is then used to correct physiological data derived from the signal proportional to the amplitude of the incident light; and,
a measuring device comprising an output generated in response to the wavelength value output.
12. The sensor system of claim 11 , wherein the physiological measurement and the output of the measuring device are oxygen saturation within blood, cardiac output, blood pressure, or vital signs.
13. The sensor system of claim 11 , further comprising software that operates on the controller.
14. The sensor system of claim 13 , the software comprising instructions for compensating for wavelength variation of the incident light radiation caused by changes in temperature.
15. The sensor system of claim 11 , wherein the incident light radiation is coherent.
16. A sensor system comprising:
a probe comprising a light source and a sensor, the sensor having a probe calibration output and a calibrated probe output, wherein the probe outputs are responsive to incident light radiation received from the light source to produce signals proportional to an amplitude and a centroid wavelength of the incident light, and the probe calibration output is generated prior to taking a physiological measurement;
a calibration circuit in signal communication with the probe and comprising an electronic calibration output responsive to the probe calibration output, and a calibrated electronic output responsive to the calibrated probe output;
a controller in signal communication with the calibration circuit and comprising logic responsive to the electronic calibration output and the calibrated electronic output to produce a wavelength value output that is used to determine, in real-time, the physiological measurement, and is then used to correct physiological data derived from the signal proportional to the amplitude of the incident light.
17. The sensor system of claim 16 , wherein the physiological measurement is oxygen saturation within blood, cardiac output, blood pressure, or vital signs.
18. The sensor system of claim 16 , further comprising software that operates on the controller.
19. The sensor system of claim 18 , the software comprising instructions for compensating for wavelength variation of the incident light radiation caused by changes in temperature.
20. The sensor system of claim 16 , wherein the incident light radiation is coherent.