Study on a Novel Method of On-line Viscosity Measuring Based on Singlechip

The off-line viscosity measuring destroys the real time performance and the precision, and the change of temperature causes a biggish impact to the output of the bridge circuit. This paper proposed an improved method based on singlechip AT89C55WD, which realized the on-line signals gathering and the data processing of many kinds of signals, to measure the fluid viscosity. The configuration of the sensor was given, which was designed independently after many times tests and error analysis, and the bridge circuit was improved again. The temperature measurement was carried out based on the DS18B20-PAR chip, and the temperature compensation was adopted based on the back propagation(BP) neural network algorithm, thus the output signal of the viscosity sensor will be a monodrome function for the survey, the temperature influence was eliminated greatly. Furthermore the multi-sensors Kalman filtering technology and the software fault-tolerant technology as well as the partition non-linearity compensation were applied, thus the cross-interference among the sensors was weakened greatly.