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| Geometric Parameter Measurement of Ultrasonic Flowmeter Based on Laser Tracker |
| CUI Hang1,2,HU He-ming2,LI Li-xia3,GUO Chen-xi3,XIE Dai-liang1,YANG Zhuo4,CHENG Zhen4 |
1. China Jiliang University, Hangzhou, Zhejiang 310018, China;
2. National Institute of Metrology, Beijing 100029, China
3. Beijing South-to-North Water Diversion Tuancheng Lake Management Office, Beijing 100195, China
4. Beijing Hydrology Center, Beijing 100089, China |
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Abstract For large diameter ultrasonic flowmeters with probes installed on existing pipe, geometric parameters measurement contribute a lot to the flowmeter accuracy, based on laser tracker, a geometrical parameter measurement method for large-diameter ultrasonic flowmeter is established. 3-D coordinates of pipe surface points and probe cylinder points are collected by laser tracker outside the pipe. Spatial model of the pipe and probes are built by a commercial tool, and then all the geometric parameters are calculated. Two field measurements of pump station pipes are performed to estimate the flow uncertainty due to different geometric parameters using this method. The method not only solves the problem of geometric measurement outside the pipe, and the uncertainty level is also controlled at around 0.2%. Compared with the measured values by the laser tracker, it is show that there are not small deviation in the setting values by manufacturers, which needs to be paid more attention by manufacturers and owners.
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Received: 23 January 2019
Published: 28 August 2020
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Corresponding Authors:
Heming Hu
E-mail: huhm@nim.ac.cn
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2020, Vol. 41 
