This paper introduces the platform of experiments,which is used to study the relationship between ultrasonic attenuation coefficient and the consistency of suspended particulate matter.The platform adopts the AT89C51 microcontroller of ATMEL,and mainly consists of the pulse generating circuit,the drive circuit of underwatertransducer,the detection circuit,the data acquisition circuit and the serial port communication circuit with PC.After the data transmits to PC,we use curve fitting method to process data ...