利用超声波的测量仪表多数是根据超声波信号在被测介质中传播时间的变化来测量其物理量。因此,超声波仪表的精度和所检测到的传播时间的准确度密切相关。 本文所介绍的超声波传播时间的检测方法能够和超声波的衰减无关,准确地检测出超声波在介质中的传播时间,因此能广泛地应用 Most of the use of ultrasonic measuring instruments based on the ultrasonic signal in the measured medium propagation time changes to measure its physical quantity. Therefore, the accuracy of the ultrasonic instrument is closely related to the accuracy of the detected propagation time. The ultrasonic propagation time detection method introduced in this paper can detect the propagation time of the ultrasonic wave in the medium accurately regardless of the attenuation of the ultrasonic wave and therefore can be widely applied