Puttmer A, Hauptmann P, Henning B
A. Puttmer is with Siemens AG, A&D GT5, 76181 Karlsruhe, Germany.
IEEE Trans Ultrason Ferroelectr Freq Control. 2000;47(1):85-92. doi: 10.1109/58.818751.
This paper presents an ultrasonic density sensor for liquids that unifies high accuracy with high durability and is suitable for on-line measurements in a wide range of tube diameters. The sensor consists of a transducer with a piezoceramic disk mounted between two reference rods of quartz glass. Additionally, a second transducer is used as a sound receiver. The density is obtained from the reflection coefficient of ultrasound at the interface between the quartz glass rod and the liquid and the transit time of sound between this interface and the second transducer. Parameters, such as high long-term stability and accuracy of +/-0.1% of full scale, were obtained by an internal acoustic reference measurement. The reference signal is generated using the sound radiated from the rear side of the piezoceramic disk. Design aspects such as sensor materials and signal-to-noise ratio are discussed, and experimental results are given in this paper. Applications of the sensor include concentration measurement, and ultrasonic mass flow measurement.
本文介绍了一种用于液体的超声波密度传感器，该传感器兼具高精度和高耐用性，适用于多种管径的在线测量。该传感器由一个换能器组成，换能器中有一个压电陶瓷圆盘安装在两根石英玻璃参考棒之间。此外，第二个换能器用作声音接收器。密度是通过超声波在石英玻璃棒与液体界面处的反射系数以及该界面与第二个换能器之间声音的传播时间来获得的。通过内部声学参考测量获得了诸如高长期稳定性和满量程精度为±0.1%等参数。参考信号是利用从压电陶瓷圆盘后侧辐射出的声音产生的。本文讨论了传感器材料和信噪比等设计方面，并给出了实验结果。该传感器的应用包括浓度测量和超声质量流量测量。
