一种新型多径超声气体流量计

Y. Ben, Zhong-ning Zhang, Shu-Yi Zhang
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引用次数: 2

摘要

一般来说,影响超声波传递时气体流量计测量精度的主要因素有两个:管道内气体流速分布的计算和超声波从一个换能器传递到另一个换能器的传递时间的测量。本文考虑到这些影响因素,提出了一种基于单片机和单板机主从控制的超声波气体流量计设计方案。为了计算整个管道内的速度分布,采用多轨迹(5轨迹)测量位于管道5个不同剖面的每对相应换能器之间的超声波传递次数,可以更准确地描述管壁附近的气体速度,特别是在低气体速度下。同时,利用软件对超声波束挠度随气速变化的变化进行修正,以提高时间间隔的精度。此外,采用峰值传输电路优化了系统的自适应能力,提高了系统的信噪比,减小了超声波束偏转引起的测量误差。最后,本文在上述改进的基础上提出了一种新的流量计算算法。结果表明,与传统方法相比,该方法具有更好的准确度、可量程性、稳定性和重复性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A new type of ultrasonic gas flowmeter with multi-tracks
In general, two major factors effect on the measurement precision of ultrasonic transit-time gas flowmeter: the calculations of gas velocity distribution in the pipe and the measurements of the transit time of ultrasonic transmitting from one transducer to another. In this paper, considering the affect factors, a new design of ultrasonic gas flow meter is proposed, which is operated by a master slave control based on a single board computer and a MCU. In order to calculate the velocity distribution in the whole pipe, the multi-tracks (5 tracks) are used to measure the transit times of ultrasonic waves between each pair of the corresponding transducers located at five different profiles of the pipe, by which the gas velocity near the pipe wall can be described more accurately, especially at a low gas velocity. Meanwhile, the ultrasonic beam deflection altered with the change of the gas velocity is modified by software in order to improve the accuracy of time interval. In addition, the peak value transmission circuit is employed to optimize the self-adaptive ability of the system, which can also raise the SNR and reduce the measurement error resulting from the ultrasonic beam deflection. At last, this work proposed a new algorithm for flow calculation based on the improvements mentioned above. These results show that the method has better accuracy, rangeability, stability and repeatability compared to traditional ones.
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