Optical Glucose measurement

There are quite a few methods that use Infrared Spectroscopy principle but with different mathematical calibrations like Dynamic Concentration Correction algorithm in Raman spectrscopy [1], Clarke error grid analysis[2] etc

References:
[1]Press release on August 9, 2010 by Massachusetts Institute of technology
[2]An article from Applied Spectroscopy, Vol. 60, Issue 12, pp. 1423-1431 (2006) called "Noninvasive Near-Infrared Blood Glucose Monitoring Using a Calibration Model Built by a Numerical Simulation Method" by Katsuhiko Maruo, Tomohiro Oota, Mitsuhiro Tsurugi, Takehiro Nakagawa, Hidenobu Arimoto, Mineji Hayakawa, Mamoru Tamura, Yukihiro Ozaki, and Yukio Yamada