By John G Webster
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Additional resources for Design of pulse oximeters
The automatic syringe then draws a volume of blood (vb) from the mixing syringe. The volume of blood and a known volume of the reagent (Vr) are mixed back and forth between the syringes. The partial pressure of oxygen of the blood-reagent solution (P,)is then measured by a blood-gas analyzer. 2) where a is the solubility coefficient of oxygen in the blood-reagent solution at the temperature at which the measurement was made. Its value is obtained from either a separate experiment or from reference tables (Adams and Hahn 1982).
Further detail of each of these parts can be found in later chapters. 1 Overview By taking advantage of the pulsatile flow of blood, the pulse oximeter is able to overcome many of the problems of earlier technologies. The pulse oximeter tracks the change in light absorbance as the blood pulses. By tracking this peak-to-peak ac component, the absorbance due to venous blood or tissue does not have any effect on the measurement. Light scattering is still a source of inaccuracy in pulse oximeters. Beer’s law does not account for the scattering of light.
C- digital subsystem converter 8 8 , t , I I I I I t I I I \ I , I 1 I I I I I 1 , I I I 1 , , I t 1 : ; I I I I t , 6 .. I t b , i Demodulator IR filter andgain - + Red filter andgain Calibration sensing circuit Modulator 1 I I I I I .............. 9 Block diagram of a pulse oximeter system. The arrows show the flow of data. The microprocessor also provides control and timing for the demodulator, modulator, and LED control circuits. The two wavelengths chosen for pulse oximetry are 660 nm and 940 nm.