In the solenoid coil magnetic field

the corresponding relationship among the concentration of sodium chloride solution

glucose solution and their magnetic rotation angle is researched in the temperature range of 20 ~24 ℃. The Ne-He laser with the wavelength of 632. 8 nm is used in the experiment as light source. The corresponding relationship between the concentration and rotation angle is calibrated by standard concentration gradient solution

unknown concentration of solution can be detected by using this relationship. The magnetic rotation angle of the solution is proportional to the concentration and is increased with the increase of th

e magnetic induction intensity. In the solenoid coil of 120 m T in the center

the rotation angles of sodium chloride solutions range of 0

30 g/100 m L vary from 2. 02° to 2. 82° and relative errors range of-0. 49 %

1. 15 %. The magnetic rotation angles of glucose solutions range of 0

50 g/100 m L vary from 2. 02° to 25. 69° and their relative errors range of-0. 67 %

0. 44 %. The uncertainty of this system is 0. 05°.