一种新型液体极小流量在线测量方法

doi:10.3901/JME.2025.06.066

机械工程学报 ›› 2025, Vol. 61 ›› Issue (6): 66-78.doi: 10.3901/JME.2025.06.066

• 仪器科学与技术 • 上一篇

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一种新型液体极小流量在线测量方法

黄丹平¹, 王靖丹¹, 罗凡², 廖世鹏³, 甘芳吉⁴

1. 四川轻化工大学机械工程学院宜宾 644000;
2. 中国测试技术研究院成都 610021;
3. 中国科学院成都分院计算机研究所成都 610041;
4. 四川大学机械工程学院成都 610065

收稿日期:2024-07-30 修回日期:2024-12-20 发布日期:2025-04-14
作者简介:黄丹平(通信作者)，男，1969年出生，博士，教授，硕士研究生导师。主要研究方向为流量传感器与人工智能。E-mail:hdpyx2002@163.com;王靖丹，男，1998年出生。主要研究方向为视觉检测、流量测量与人工智能。E-mail:1305853127@qq.com;罗凡，男，1980年出生，博士，研究员。主要研究方向为流量测量。E-mail:2934914@qq.com
基金资助:
国家自然科学基金(52370067)、过程装备与控制工程四川省高校重点实验室开放基金(GK202209)和四川省重点实验室(NJ2018-05)资助项目。

Novel Online Measurement Method for Minuscule Liquid Flow Rates

HUANG Danping¹, WANG Jingdan¹, LUO Fan², LIAO Shipeng³, GAN Fangji⁴

1. College of Mechanical Engineering, Sichuan University of Science & Engineering, Yibin 644000;
2. National institute of measurement and testing technology, Chengdu, 610021;
3. Chengdu Institute of Computer Application, Chinese Academy of Sciences, Chengdu, 610041;
4. College of Mechanical Engineering, Sichuan University, Chengdu, 610065

Received:2024-07-30 Revised:2024-12-20 Published:2025-04-14

摘要/Abstract

摘要： 针对极小液体流量(≤1mL/h)测量所面临的挑战，提出一种新型液体极小流量在线测量方法。该方法通过对视觉信息进行分析，求解出极小流量下，管路口液体处于滴流状态时液滴的形态尺寸变化速率，从而进一步探究其与管路中液体流速的关系。为解决在极小流量下因液滴微小抖动及形态非轴对称而产生的测量误差问题，研发一种六棱柱腔体，并结合三组视觉采集单元与同步触发控制器，可实现对悬挂液滴动态体积视觉信息数据的多视角同步采集。提出多参数对称性验证，以及一种基于多视角采集的液滴体积测量优化算法，进一步提高系统测量精度。试验结果表明，在液体极小流量状态下，所建系统形成的液滴具有较好的轴对称性；多视角液滴体积测量方法相较单一视角测量方法，其精度提升2.39%，重复性降低0.357%。在0.8～60 mL/h范围流量的测量中均能保持较高的测量精度和良好的重复性。经反复试验测试，该液体极小流量测量方法高效、便捷且具有较高的测量精度，蕴藏着广阔的应用前景，为极小流量测量问题的研究提供一条具有借鉴性的方法与思路。

关键词: 极小液体流量, 视觉信息, 多视角同步采集, 对称性验证

Abstract: To address the challenges encountered in measuring very small liquid flow rates(≤1mL/h), a novel method for the online measurement of minuscule liquid flow rates is proposed. The method involves the analysis of visual information to determine the rate of change in the morphological dimensions of droplets at the pipe outlet under conditions of extremely low flow, where the liquid is in a dripping state. This rate of change is then used to investigate the relationship between these measurements and the velocity of the liquid within the pipe. To address the measurement errors resulting from minute droplet oscillations and non-axial symmetry at extremely low flow rates, a hexagonal prism cavity has been developed. Combined with three groups of visual acquisition units and a synchronous trigger controller, the multi-angle synchronous acquisition of dynamic volume visual information data of suspended droplets can be realised. The verification of multi-parameter symmetry is proposed, along with an optimised droplet volume measurement algorithm based on multi-angle acquisition, to further enhance the precision of system measurements. The experimental outcomes demonstrate that the droplets produced by the system exhibit good axial symmetry even at very low flow rates. The multi-view droplet volume measurement optimization algorithm improves accuracy by 2.39% over single-view methods and reduces repeatability by 0.357%. Both measurement precision and repeatability are sustained at high levels across a flow rate range of 0.8 to 60 mL /h. Through extensive experimental verification, this method for measuring very low liquid flow rates is proved to be efficient, convenient, and highly accurate, offering significant potential for application and providing a referential approach for the measurement of ultra-low flow rate rates.

Key words: minuscule liquid flow, visual information, multi-view simultaneous acquisition, symmetry verification

中图分类号:

TH814

黄丹平, 王靖丹, 罗凡, 廖世鹏, 甘芳吉. 一种新型液体极小流量在线测量方法[J]. 机械工程学报, 2025, 61(6): 66-78.

HUANG Danping, WANG Jingdan, LUO Fan, LIAO Shipeng, GAN Fangji. Novel Online Measurement Method for Minuscule Liquid Flow Rates[J]. Journal of Mechanical Engineering, 2025, 61(6): 66-78.

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一种新型液体极小流量在线测量方法

Novel Online Measurement Method for Minuscule Liquid Flow Rates

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