Turbidity detection system based on scattering and transmission method
                                                          QI Shengbo1, YIN Baoan1, YU Jingdong2
(1.College of Engineering, Ocean University of China, Qingdao 266100, China;2.Qingdao Sencott Intelligent Instrument Co., Ltd., Qingdao 266200, China）

Abstract: Aiming at the problems of various turbidity measurement modes, different application ranges and the accuracy of turbidity detection error compensation, the measurement mode, light source driving, automatic range switching, software calibration and temperature compensation of turbidity detection system were researched. A new probe structure and turbidity detection circuit based on scattering method and transmission method were designed based on the principle study of turbidity measurement. The turbidity information was collected by the new type of probe, and the software of the detection system was calibrated by means of sectional calibration, and the temperature compensation of the detection system was carried out. The results indicate that the turbidity detection system can detect the turbidity signal in real time, and has the functions of automatic range switching, data processing, software calibration and temperature compensation. The system can accurately measure the turbidity of the solution to be measured in the range of 0-1 000 NTU.And the measurement accuracy is within ±1% FS.

Key words: turbidity detection; 90 degree scattering method; transmission method; sectional calibration; temperature compensation