ABSTRACT
A simple and high-accuracy self-mixing interferometer based on single high-order orthogonally polarized feedback effects is presented. The single high-order feedback effect is realized when dual-frequency laser reflects numerous times in a Fabry-Perot cavity and then goes back to the laser resonator along the same route. In this case, two orthogonally polarized feedback fringes with nanoscale resolution are obtained. This self-mixing interferometer has the advantages of higher sensitivity to weak signal than that of conventional interferometer. In addition, two orthogonally polarized fringes are useful for discriminating the moving direction of measured object. The experiment of measuring 2.5nm step is conducted, which shows a great potential in nanometrology.
ABSTRACT
The hemorheological performance of mammals and human will change with the time after the blood is withdraw from the subject. The whole blood apparent viscosity, erythrocyte deformability and aggregation of some mammals and human were measured. Our results showed that the hemorheological characteristics of mice, rats, guinea pigs, dogs and human began to change respectively after the threshold time of 0.5, 1, 3, 7, 12 h when the blood were stored in vitro. Moreover there exist a relationship: t=3.18W(0.32) between the threshold time (t) and the animal weight (W) and the related coefficient is 0.992.
