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As a nondestructive testing method, magnetic particle testing is widely used in power industry. The comprehensive sensitivity of the magnetic particle detection can be tested by A1 standard shims. However, at present, the evaluation of the clarity of magnetic trace on standard shims still depends on subjective judgment of the tester. In order to eliminate the subjective factors in the evaluation, this paper proposes a standard magnetic trace evaluation method based on machine vision. Based on Python programming language and OpenCV function library, the initial obtained magnetic trace is processed by image correction, magnetic trace extraction, quantitative analysis and evaluation using computer program. On this basis, the influence of the thickness of non-magnetic layer on the comprehensive sensitivity of magnetic particle detection is investigated using this method. It is shown that the magnetic trace evaluation method based on machine vision is more objective and accurate than the conventional manual evaluation.

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磁粉检测作为一种无损检测方法,在电力行业有广泛应用,其综合灵敏度由A1型标准试片检验,然而标准试片磁痕的清晰度评价仍取决于检测人员的主观判断。为排除磁痕清晰度评价中人为主观因素,提出一种基于机器视觉的标准试片磁痕清晰度评价方法。对获取的标准试片磁痕图像,使用Python程序设计语言调用OpenCV函数库,实现对磁痕图像的掩膜获取,然后通过二值化提取磁痕以及计算磁痕与背景的直方图,定量分析与评价磁痕图像的清晰度,同时使用该方法确定了非磁性层厚度对磁粉检测综合灵敏度的影响。标准试片磁痕图像分析结果可知,基于机器视觉的标准试片磁痕提取效果良好,清晰度评价结果比传统人工评价更加客观可靠。

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邱张维佳(1993),男,博士,工程师,主要研究方向为无损检测与电站材料分析,

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邱张维佳(1993),男,博士,工程师,主要研究方向为无损检测与电站材料分析,

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邱张维佳(1993),男,博士,工程师,主要研究方向为无损检测与电站材料分析,

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基于机器视觉的标准试片磁痕评价方法
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邱张维佳 , 王志强 , 秦承鹏
热力发电 | 发电技术论坛 2023,52(1): 140-148
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热力发电 | 发电技术论坛 2023, 52(1): 140-148
基于机器视觉的标准试片磁痕评价方法
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邱张维佳 , 王志强, 秦承鹏
作者信息
  • 西安热工研究院有限公司,陕西 西安 710054
  • 邱张维佳(1993),男,博士,工程师,主要研究方向为无损检测与电站材料分析,

Research and application of magnetic trace evaluation method for standard test shims based on machine vision
Zhangweijia QIU , Zhiqiang WANG, Chengpeng QIN
Affiliations
  • Xi'an Thermal Power Research Institute Co, Ltd, Xi'an 710054, China
出版时间: 2023-01-25 doi: 10.19666/j.rlfd.202206167
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磁粉检测作为一种无损检测方法,在电力行业有广泛应用,其综合灵敏度由A1型标准试片检验,然而标准试片磁痕的清晰度评价仍取决于检测人员的主观判断。为排除磁痕清晰度评价中人为主观因素,提出一种基于机器视觉的标准试片磁痕清晰度评价方法。对获取的标准试片磁痕图像,使用Python程序设计语言调用OpenCV函数库,实现对磁痕图像的掩膜获取,然后通过二值化提取磁痕以及计算磁痕与背景的直方图,定量分析与评价磁痕图像的清晰度,同时使用该方法确定了非磁性层厚度对磁粉检测综合灵敏度的影响。标准试片磁痕图像分析结果可知,基于机器视觉的标准试片磁痕提取效果良好,清晰度评价结果比传统人工评价更加客观可靠。

磁粉检测  /  机器视觉  /  磁痕图像  /  OpenCV  /  标准试片

As a nondestructive testing method, magnetic particle testing is widely used in power industry. The comprehensive sensitivity of the magnetic particle detection can be tested by A1 standard shims. However, at present, the evaluation of the clarity of magnetic trace on standard shims still depends on subjective judgment of the tester. In order to eliminate the subjective factors in the evaluation, this paper proposes a standard magnetic trace evaluation method based on machine vision. Based on Python programming language and OpenCV function library, the initial obtained magnetic trace is processed by image correction, magnetic trace extraction, quantitative analysis and evaluation using computer program. On this basis, the influence of the thickness of non-magnetic layer on the comprehensive sensitivity of magnetic particle detection is investigated using this method. It is shown that the magnetic trace evaluation method based on machine vision is more objective and accurate than the conventional manual evaluation.

magnetic particle testing  /  machine vision  /  magnetic image  /  OpenCV  /  standard shim
邱张维佳, 王志强, 秦承鹏. 基于机器视觉的标准试片磁痕评价方法. 热力发电, 2023 , 52 (1) : 140 -148 . DOI: 10.19666/j.rlfd.202206167
Zhangweijia QIU, Zhiqiang WANG, Chengpeng QIN. Research and application of magnetic trace evaluation method for standard test shims based on machine vision[J]. Thermal Power Generation, 2023 , 52 (1) : 140 -148 . DOI: 10.19666/j.rlfd.202206167
  • 西安热工研究院有限公司自主科技项目(TN-21-TZK26)
2023年第52卷第1期
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doi: 10.19666/j.rlfd.202206167
  • 接收时间:2022-06-29
  • 首发时间:2026-01-23
  • 出版时间:2023-01-25
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  • 收稿日期:2022-06-29
基金
Independent Technology Project of Xi'an Thermal Power Research Institute Co., Ltd.(TN-21-TZK26)
西安热工研究院有限公司自主科技项目(TN-21-TZK26)
作者信息
    西安热工研究院有限公司,陕西 西安 710054
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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