文章基本信息

标题：Design and Implementation of Ultrasonic Velocity Measuring Module Based on Phase-Locked Loop
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作者：Ding, Yingqiang ; Peng, Dan ; Han, Gangtao 等
期刊名称：Journal of Computers
印刷版ISSN：1796-203X
出版年度：2012
卷号：7
期号：12
页码：2876-2883
DOI：10.4304/jcp.7.12.2876-2883
语种：English
出版社：Academy Publisher
摘要：Due to the important relationship between ultrasonic velocity and some properties of sample, the measurement of velocity of ultrasound is widely needed in various fields. In this paper, based on phase-locked loop technique, a new hybrid circuit is designed for ultrasonic velocity measurement and named as UV-PLL. In order to improve the stability of phase and achieve the ability of fast locking, an auxiliary capturing circuit, which consists of phase shift circuit and capturing circuit, is designed and implemented in this module. Additionally, two methods for estimating the propagation delay is compared and described in detail. The UV-PLL module is validated through the ultrasonic velocity measurement in distilled water at different temperatures. Experimental results show that the maximum relative deviation of velocity measurement is less than 0.15% and the loop can be quickly locked, indicating that this module can meet the requirements of online measurement and can be widely applied.
关键词：ultrasound;velocity;phase-locked loop (PLL);auxiliary capturing circuit;amplitude