Ohmeda Biox 3700 - Page 15

1118-301
Two wavelengths of light, red and infrared, are utilized to gauge the
presence of oxygenated and reduced hemoglobin.
600
700 800 900
WAVELENGTH (ran)
(INFRARED)
840nm
1000
EXTINCTION versus WAVELENGTH GRAPH
Oxygenated hemoglobin (Hb02) exhibit markedly different
absorption (extinction) characteristics to red light @
660nm and infrared light @ 940 nm.
InH Son ? I Phot°detector converts the light, which is partially absorbed
and modulated as it passes through the tissue sample, into an electronic
signal. Since Hb02 and Hb allow different amounts of light to reach the
photodetector at the selected wavelengths, the electronic signal varies
heC^Mn0" tk Ught S°UrCe iS "°n" and the oxy^nation of the arterial
hemoglobin. The oximeter amplifies the electronic signals received.
Mni°? !n c igUai Si?nal Processin« averts the light intensity informa-
front panel 2 * "" ValU6S ^ disPlays thera on the oximeter
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