Since 90° scattering method and surface scattering method only suitable for low and high turbidity range measurement

a novel wide-range turbidity measurement scheme is proposed by incorporating both the above two methods. A new type of turbidity detecting structure integrates the two measurement methods in one turbidity sensor probe is designed based on this idea

which can greatly broaden turbidity measurement range and effectively reduce volume and cost of sensor. Experimental results show that the turbidity sensor can precisely measure turbidity of solution under test in a wide range of 0

4 000 NTU

with measurement precision within ± 5 % FS

on the premise of assuring measurement precision

measurement range is improved obviously.