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665nm 와 805nm 의 파장을 이용한 인공심장용 혈증 산소포화도의 광학적 측정
박세광,권기진 ( Se Kwang Park,Ki Jin Kwon ) 한국센서학회 1993 센서학회지 Vol.2 No.1
This study describes a non-invasive optical sensor and system in order to obtain oxygen saturation of blood, in-vitro. The sensor contains LED 665nm and 805nm of wavelength for light source and PIN photodiode for light detector in flat pack. The sensor system for measurement of oxygen saturation has breadboarded, including signal amplifier, filter, displayer, A/D converter, microprocessor and memory. Experimental set-up for non-invasive measurement of oxygen saturation in-vitro was done. When the variation of oxygen saturation is compared with that of each wavelength, the variation of 665nm is more than that of 805nm by five times. As oxygen saturation varies from 100% to 60%, and the reflection ratio (R805/R665) is changed linearly. The oxygen saturation in 100%∼60% range can be measured with about 5% resolution by the developed sensor, such that if this sensor connects with the main artery and vein. the artificial heart can be controlled rapidly and precisely from measurement of the sensor.