Utilizing the characteristic of the ultrasonic longitudinal wave,a new method that judges the density of oil by measuring time difference and phase place is put forward,and an instrument is designed.

• 利用超声波纵波的特性,提出一种利用超声波在油料中传播的时间差和相位差两项指标综合判定油料密度的方法,并设计了检测装置。