基于机器视觉的水表小流量检定方法研究

doi:10.3969/j.issn.1000-1158.2021.09.08

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Abstract In the view of the current water meter small flow verification time is long,the manual reading is not accurate and other reasons, a verification method of water meter in small flow based on machine vision is proposed. The plum blossom rotor image of water meter is acquired by industrial camera with adaptive sampling frequency. According to the theory of image overlap, the image of the rotor at the beginning of the verification is used as the background, and the subsequent images overlap on this background. During the rotation of the rotor, the number of rotating teeth is counted from the periodic changing of the percent of white and black areas in the overlap image. The indicated volume of the water meter is obtained by the pulse equivalent with the double-time method. Liquid flow standard device is used to calibrate water meter with the actual volume got by the weighing tank through static mass method. The error of water meter can be calculated. The experimental results manifest that the result obtained by this verification method is consistent to the manual reading with shorten verification time and less water in small flow. The method can solve the reading interference from bubbles, and the verification efficiency can be improved.

Key words： metrology water meter verification machine vision small flow plum blossom rotor

Received: 15 January 2020 Published: 24 September 2021

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TB937

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	Articles by authors
	LIN Ke-nan
	ZHUANG Yuan
	HUANG Yong-mei

Cite this article:

LIN Ke-nan,ZHUANG Yuan,HUANG Yong-mei. Research on Small Flow Verification Method of Water Meter Based on Machine Vision[J]. Acta Metrologica Sinica, 2021, 42(9): 1167-1171.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2021.09.08 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2021/V42/I9/1167

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