Temporial difference of Ir spectra from the finger tip has the arterial pulse which is the area of interest in the present high speed spectrophoyometer. Influence of basal components like resting blood, bones, skin and muscles are removed from pulsatile blood component [1].
There are some of the other methods that exploit the effect the glucose called erythrocyte scattering, new photoacoustic phenomenon, optical coherence tomography, thermo-optical studies on human skin, Raman spectroscopy studies, fluorescence measurements, and use of photonic crystals [2].
References:
[1]Proceedings of the 29th Annual International Conference of the IEEE EMBS Cité Internationale, Lyon, France August 23-26,2007 called "A New Non-invasive Method for Measuring Blood Glucose Using Instantaneous Differential Near Infrared Spectrophotometry" by
Y. Yamakoshi, M. Ogawa, T. Yamakoshi, M. Satoh, M. Nogawa S. Tanaka, T. Tamura, P. Rolfe,
& K. Yamakoshi.
[2]O. S. Khalil, “Non-invasive Glucose Measurement Technologies: AnUpdate from 1999 to the Dawn of the New Millennium,’’ Diabetes Technol. Ther., vol. 6, pp. 660-697, 2004
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