Multi-wavelength analysis of substances levels in human blood

In the paper a spectroscopic multi-wavelength non-invasive measurement of substances levels in human body is analyzed. It is assumed that measurements can be done in any part of body. Three different techniques are compared: one using single wavelength of light, and two multi-wavelength ones: using two wavelength with and without additional data for white light. Concentration levels of two compounds are predicted: glucose and ethanol. Results are then interpolated by a fourth order polynomial equation. Two-wavelength analysis gives better results than that when only one wavelength is measured, but even better approach consists of result tuning using wide spectrum data.