The principle and an experiment device are introduced by which the measurement of the relative concentration of lotion is carried out continuously with the double beam system of laser.
采用双光路激光系统，对清洗液的相对浓度进行了连续测量，给出了测定原理和实验装置。
2
Bymeasurement of the scanning Angle of the laserbeam, the displacement of the metal plate can be calculated.
通过对光束扫描角度的测量，就可计算出金属板的位移量。
3
A new measurement method of refractive index of plane-parallel plate has been introduced in this paper, which is performed by thin laserbeam.