Aiming at shortcomings of cumbersome process and large error of sound velocity measuring in traditional college physics experiment

based on technology of MCU

design and fabricate a set of digital intelligent sound velocity measurement experimental system

which makes it possible to measure sound velocity precisely by using phase comparison method. The system use MSP430 MCU as core

and software and hardware of sound velocity measurement system are designed

denoising and optimized processing are carried out

aiming at interference and error. Measurement data communicates with Lab VIEW compiled upper computer via RS—485 bus

generate data reports. This measuring instrument replaces traditional method of observing a dual trace oscilloscope’s Lissajous FIG with electronic monitoring and control mode

and test results show that the device is user-friendly and works stably

measurement precision is far higher than traditional experimental device

and has good application prospect.