Study on the cross-polarization method for extracting internal information of objects

In noninvasive near-infrared (NIR) noncontact measurement, a cross-polarization method is employed to eliminate undesired surface reflection and extract useful internal information. Experiments on various samples (both in vitro and in vivo) at different source-detector separations (SDSs) were conducted to investigate the effectiveness of this method. In conclusion, the cross-polarization method is proved to be effective in eliminating surface reflection as well as conducive to the measurement of objects’ internal information and this method is more suitable for scattering objects with smooth surfaces and complex interiors. Furthermore, a larger SDS can lead to a better measurement effect. This study can be a reference for tissue constituent sensing.