The apparatus uses 880 , 950nm nir led as light source , interference filter as homochromy device , si photronic as detector . digital signal comes from ad transformation , processed by microprocessor system 以880 、 950nm的近红外led为光源， 14个窄带干涉滤光片为单色器，以硅光电池为检测器，经ad转换得到数字信号，送单片机处理。
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