An improved method and apparatus for diffuse reflectance spectroscopy. A specular control device is provided that can discriminate between diffusely reflected light that is reflected from selected depths or layers within the tissue. The specular control device permits a spectroscopic analyzer to receive...http://www.google.com.au/patents/US7623906?utm_source=gb-gplus-sharePatent US7623906 - Diffuse reflectance spectroscopy
