Making of Intelligent Simulation Experiment of Sound Velocity Measurement

Ultrasound is used as the wave source for the sound velocity measurement experiment. Ultrasonic wave is used to form standing wave in the reflection interval, the position of two adjacent wave anti nodes is used to determine the half wavelength, and the sound velocity in the experimental state is measured. The specific experimental apparatus applies a spiral structure. The hand-wheel rotates through one cycle and the ultrasound emitter moves 1mm accordingly. Therefore, the circumference of the drum-wheel driven by the hand-wheel is equally divided into 100 scales, each scale is for one grid, and a spin of one grid is one percent of 1mm, thus the accuracy can be 0.001mm. But there usually exists half pitch deviation because of the clockwise and counterclockwise rotation of the drum wheel clockwise and counterclockwise usually produces half pitch. For the sound velocity measurement experiment it is unacceptable to rotate the drum-wheel at different directions back and forth. In order to avoid this nuisance, we propose a computer-based simulation experiment system and this system can help to obtain a higher precision which is up to four significant digits when compared to the practical experiment. This simulation system can effectively avoid operational mistakes by the experimenter. The experimental data henceforth will be of ideal precision. This system is also capable of repetitive operation which can make up for the deficiency of practical experiments.