An optical turbidity meter based on the vertical polarization light scattering measurement scheme was proposed to reduce the influence caused by the background light. The polarization light was generated by using a polarizer after the normal light source and the other polarizer were placed before the detector to reduce the measurement error. A high performance operational amplifier circuit with low temperature drift and low noise was used to drive the light source and for signal processing, which can dramatically increase the turbidity measurement accuracy. Experimental results show that the turbidity meter can accurately measure the turbidity of the solution within the test range of 0~400 NTU with the measurement error less than 5%F.S under different ambient light conditions, showing its strong ability of anti-interference .
