中文摘要：

针对传统的密度测量仪器存在的不足，根据超声波的传播特性设计了一种超声波密度计。通过超声波波速的测量来实现密度计的高精度测量。利用高分辨率、快速的信号采样电路以及数字细分算法使超声波传播时间的测量达到ns级，为密度测量的分辨率优于0．00001＆#215;103 kg／m3提供了保障。采用分布式多声道结构有利于密度测量精度的提高。

英文摘要：

To settle some problems on the traditional density measurement instrument against ac-tual application,a high precision ultrasonic densimeter is designed on the basis of the ultrasonic wave propagation characteristics.The high resolution and fast signal col ection circuit and the dig-ital subdivision algorithms which are used to make the measurement of the ultrasonic wave propa-gation time reach nanosecond and ensure the measurement resolution of the ultrasonic densime-ter better than 0.000 01 ＆#215;103 kg/m3.The distributed measuring probes are instal ed oppositely at the ektexine of the vessel which is contained the measured medium.The distributed structure de-sign is helpful to improve the accuracy of the measurement result.