The present invention generally relates to apparatus and methods for obtaining absolute values of concentrations of chromophores of a medium and/or absolute values of their ratios. In particular, the present invention relates to continuous wave spectroscopic optical systems and methods for determining...http://www.google.es/patents/US6587703?utm_source=gb-gplus-sharePatente US6587703 - System and method for measuring absolute oxygen saturation
System and method for measuring absolute oxygen saturation
