R. Marbach et Hm. Heise, OPTICAL DIFFUSE-REFLECTANCE ACCESSORY FOR MEASUREMENTS OF SKIN TISSUEBY NEAR-INFRARED SPECTROSCOPY, Applied optics, 34(4), 1995, pp. 610-621
An optimized accessary for measuring the diffuse reflectance spectra o
f human skin tissue in the near-infrared spectral range is presented.
The device includes an on-axis ellipsoidal collecting mirror with effi
cient illumination optics for small sampling areas of bulky body speci
mens. The optical design is supported by the results of a Monte Carlo
simulation study of the reflectance characteristics of skin tissue. Be
cause the results evolved from efforts to measure blood glucose noninv
asively, the main emphasis is placed on the long-wavelength near-infra
red range where sufficient penetration depth for radiation into tissue
is still available. The accessory is applied for in vivo diffuse refl
ectance measurements.