By using a “slit-less” Fourier-transform spectrometer, we demonstrate that cardiac-pulsation amplitude of absorbance can be extracted from 3.5-level absorbance unit (AU) spectra of a human fingertip with a resolution of < 0.0005 AU and a spectral resolution of < several tens of nanometers, even with a low-cost “non-cooled” NIR detector. From the extracted spectrum over 1,000-1,400 nm, the average amounts of pulsating blood components (water, HbO2, and lipids/proteins) in a fingertip are deduced in the sub-milligram order. The results indicate the capacity of the spectrometer for a portable non-invasive blood monitor as well as for a high-end analytic instrument.
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