Application of partial inversion pulse to ultrasonic time-domain correlation method to measure the flow rate in a pipe
Application of partial inversion pulse to ultrasonic time-domain correlation method to measure the flow rate in a pipe
复制标题
部分反相脉冲超声时域相关法测量管道流量
DOI：
10.1088/1361-6501/aa83df
复制
发表时间：
2017
影响因子：
2.4
通讯作者：
Shimada Takashi
中科院分区：
文献类型：
--
作者：
Wada Sanehiro;Furuichi Noriyuki;Shimada Takashi
提出了一种新型的超声脉冲--部分反转脉冲(PIP)，并将其应用于超声时域相关(UTDC)法测量管道内的速度分布和流量。通常，测量的流量取决于管道中的速度分布；因此，现场校准是检查现场流量测量准确性的唯一方法。利用UTDC进行流量计算是基于测量的速度分布的积分。与超声脉冲多普勒法相比，该方法具有速度范围不受限制、适用于无足够反射体的流场等优点。然而，此前有报道称，UTDC的可测量速度范围受到错误检测的限制。考虑到这种方法在现场流场中的应用，速度范围的问题是很重要的。为了减少误检测的影响，本研究开发了一种PIP信号，它是一种包含部分反转区域的超声信号。与传统方法相比，PIP信号的优点在于它需要很少的额外硬件成本和不额外的软件成本。通过数值计算，估计了反转对超声传播特性的影响。然后，在日本的国家标准水流率校准设施中进行了实验测量。实验结果表明，使用PIP信号进行测量比使用正常脉冲信号进行测量更准确，并产生更高的检测率。
This paper proposes the application of a novel ultrasonic pulse, called a partial inversion pulse (PIP), to the measurement of the velocity profile and flow rate in a pipe using the ultrasound time-domain correlation (UTDC) method. In general, the measured flow rate depends on the velocity profile in the pipe; thus, on-site calibration is the only method of checking the accuracy of on-site flow rate measurements. Flow rate calculation using UTDC is based on the integration of the measured velocity profile. The advantages of this method compared with the ultrasonic pulse Doppler method include the possibility of the velocity range having no limitation and its applicability to flow fields without a sufficient amount of reflectors. However, it has been previously reported that the measurable velocity range for UTDC is limited by false detections. Considering the application of this method to on-site flow fields, the issue of velocity range is important. To reduce the effect of false detections, a PIP signal, which is an ultrasound signal that contains a partially inverted region, was developed in this study. The advantages of the PIP signal are that it requires little additional hardware cost and no additional software cost in comparison with conventional methods. The effects of inversion on the characteristics of the ultrasound transmission were estimated through numerical calculation. Then, experimental measurements were performed at a national standard calibration facility for water flow rate in Japan. The experimental results demonstrate that measurements made using a PIP signal are more accurate and yield a higher detection ratio than measurements using a normal pulse signal.