基于模拟乘法器的超声多普勒黏度测量实验系统

Ultrasonic Doppler experiment system for viscosity measurement based on analogue multiplier

基于模拟乘法器的超声多普勒黏度测量实验系统以落球法为基础,以频移信号处理电路和数字存储示波器作为数据测量单元的核心,根据多普勒效应原理准确地测算出落球的终极速度,进而得出液体的黏度.该系统可以开展与多普勒效应相关的设计性实验.实验过程中信号的转换、传输及数据测量清晰明了,利于培养学生的综合实验能力和创新能力.

This paper introduces an ultrasonic Doppler experiment system for viscosity measurement based on analogue multiplier. Using the falling-ball method, frequency-shift signal processing circuits and digital storage oscilloscope, the end speed of the ball can be measured accurately ; then the viscosity of the liquid can be calculated according to the principle of Doppler effect. Furthermore, a number of designing experiments related to the Doppler effect can be carried out using this system. The signal conversion, transmission and processing in the experiment are clear and transparent, which is helpful for the training of students; abilities of comprehension and innovation.