An Intelligent Turbidimeter for Monitoring Suspended Sediment

摘要

Turbidity is regard as a key technical parameter in the water quality measurement. However, turbidimeter for water quality measurement is based on scattered light measurement. The electrooptical characteristic of light emitter and detector has a close relationship with the environmental temperature. Fluctuations in water temperature can potentially affect electronic components and cause output signal errors in turbidimeter. Decrease or eliminate temperature errors is necessary. In this paper, we present the design and testing of an intelligent turbidimeter which could compensate the temperature errors by soft programming. Laboratory testing showed that the method carried by MCU which is used to compensate the temperature errors by soft programming is simple and effective; it can improve the error compensation precision on turbidimeter greatly. Further testing results showed nearly linear relations between the concentration of the standard solutions and the measured turbidity. The measurement reproducibility is very high and the maximum shift is 0.02 NTU. The generic design and good performance of the turbidimeter suggests potential for application in water quality measurement.