SYSTEMS AND METHODS FOR SENSOR CALIBRATION IN PHOTOPLETHYSMOGRAPHY

摘要

Various methods and systems for obtaining calibration coefficients for pulse oximeter sensors are provided. A method includes passing current through a light emitting element in an oximeter sensor and measuring, utilizing a first voltage sensing lead, a first voltage present at an electrical input of the light emitting element. The method also includes measuring, utilizing a second voltage sensing lead, a second voltage present at an electrical output of the light emitting element and determining a forward voltage of the light emitting element based on the first and second voltages. Utilizing the determined forward voltage, a wavelength of light emitted from the light emitting element is calculated. Utilizing the calculated wavelength of the emitted light, at least one calibration coefficient for the oximeter sensor is determined.

主权项

1. A wireless photoplethysmography system, comprising:
a wireless photoplethysmography sensor, comprising:
a sensor body, comprising:
an emitter configured to emit light;a detector configured to receive the light emitted by the emitter and to generate a signal based on the light received from the emitter;a memory storing a plurality of calibration coefficients or calibration curves corresponding to respective wavelengths of light that may be emitted by the emitter;a calibration circuit coupled to an electrical input of the emitter to measure a first voltage present at the electrical input and coupled to an electrical output of the emitter to measure a second voltage present at the electrical output;a processor configured to determine a voltage difference between the first voltage and the second voltage when a current is passed through the emitter, and to select an appropriate calibration coefficient or calibration curve for the wireless photoplethysmography sensor from the plurality of calibration coefficients or calibration curves stored on the memory based on the voltage difference; anda wireless transmitter configured to wirelessly transmit the signal and the appropriate calibration coefficient or calibration curve to a monitor, wherein the appropriate calibration coefficient or calibration curve enables the monitor to calculate a physiological parameter based on the signal.