Nguyen Thi Huong Ly, Park Suhyun
School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Korea.
Sensors (Basel). 2020 Jan 10;20(2):388. doi: 10.3390/s20020388.
Most ultrasonic flowmeters utilize several wedge sensors for transmission and reception. Thus, the location and alignment of the sensors are critical factors that determine the performance of the ultrasonic flowmeter. In this study, we proposed an ultrasound liquid flowmeter utilizing a 128-element linear array transducer with a transmit delay control for varying the incidence angles of ultrasound wave transmission. The performance of the flowmeter was evaluated at flow rates of 0-50 L/min in a specially designed pipe system. Flow estimation was performed with the transit-time method using cross-correlation with phase zero-crossing for sub-sample estimation. While a single plane wave approach performed invasive electromagnetic measurements with only 74% accuracy as a reference, a multiple angular compensation method with 24 angles was proposed to increase the accuracy of measurements up to 93%. This study demonstrated the capability of the non-invasive single-sided ultrasonic flowmeter with a linear array transducer for liquid flow measurements in the metal pipe system.
大多数超声流量计使用多个楔形传感器进行发射和接收。因此，传感器的位置和对准是决定超声流量计性能的关键因素。在本研究中，我们提出了一种超声液体流量计，它利用具有发射延迟控制的128元件线性阵列换能器来改变超声波发射的入射角。在一个专门设计的管道系统中，对该流量计在0 - 50 L/min的流速下的性能进行了评估。采用渡越时间法，通过与相位过零的互相关进行子样本估计来进行流量估计。作为参考，单平面波方法进行侵入式电磁测量时的准确率仅为74%，而提出的具有24个角度的多角度补偿方法将测量准确率提高到了93%。本研究证明了带有线性阵列换能器的非侵入式单侧超声流量计在金属管道系统中进行液体流量测量的能力。
