Non-Invasive Optical Sensor for Hemoglobin Determination
نویسندگان
چکیده
Hemoglobin (Hb) is an important component of red blood cells. This paper presents an optical non-contact technique that provides Hb concentration measurement. The absorption coefficient of blood differs at different wavelength this fact is used to calculate the optical characteristics of blood. In this newly developed system, absorption of light by oxygenated and deoxygenated hemoglobin is measured at two wavelength 660nm and 940nm. The particular wavelength of light is obtained from red and IR LED. Constant current circuit is designed to drive the LEDs. Transmitted light through an area of skin on finger was detected by a photodiode. Ratio of red to IR signal after normalization is calculated for determination of Hb. Signal acquisition by this method is totally noninvasive. The sensors assembled in this investigation are fully integrated into wearable finger clips. Keywords-blood, hemoglobin, infrared, LED, noninvasive, optical method
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