Cable conductor sectional area measuring method and system based on imaging method

Abstract

The invention belongs to the technical field of cable detection, and discloses a cable conductor sectional area measurement method and system based on an imaging method, and the method comprises the steps: carrying out the initial segmentation of a local region of a detected cable end face image through self-iteration clustering; carrying out homogeneous region merging by using the feature information of each region after segmentation to obtain an accurate segmentation result; extracting a target area based on the area correlation threshold, obtaining a fine segmentation image of the cable conductor, and obtaining the number of pixels occupied by the cable conductor based on the fine segmentation image; obtaining a measured value of the sectional area of the measured cable conductor according to the number of pixels and the number of pixels corresponding to the unit area of the cable conductor, wherein the pixel number corresponding to the unit area is obtained by using a standard workpiece with a known size as a measurement target to accurately measure the pixel number. The measurement method has the advantages of no damage, no contact, high detection speed and high automation degree, realizes accurate measurement of the effective sectional area of the end surface of the cable, and can be applied to conductor sectional area measurement of various types of cables.

Description

technical field [0001] The invention belongs to the technical field of cable detection, and more particularly relates to a method and system for measuring the cross-sectional area of ​​a cable conductor based on an imaging method. Background technique [0002] The quality and quantity of cables put into the project is of great significance to the safety of power supply. If unqualified cables are used in various construction and railway projects for lighting, air conditioning and other circuits, it will bury a huge safety hazard for the project. At present, the market size of the cable industry has reached trillions, but the quality of cable products is not optimistic. The unqualified rate of wire and cable products is very high. Some products use inferior copper and recycled copper. ", thick rubber layer and thin wire core, etc., reduce the conductor cross section of the cable, the conductor ratio of the alloy cable is not up to standard, or the density is uneven, and the c...

AI Technical Summary

Problems solved by technology

If unqualified cables are used in various types of construction and railway projects for lighting, air conditioning and other circuits, it will bury a huge safety hazard for the project

At present, the market size of the cable industry has reached trillions, but the quality of cable products is not optimistic. The unqualified rate of wire and cable products is very high. Some products use inferior copper and recycled copper. ", thick rubber layer and thin wire core, etc., reduce the conductor cross section of the cable, the conductor ratio of the alloy cable is not up to standard, or the density is uneven, the cable length is less than the length of its nameplate, etc.

[0003] An important index in cable detection is the cross-sectional area of ​​the cable conductor. The existing technology includes the method of measuring wire diameter, DC resistance method and weighing method; the method of measuring wire diameter is to use a caliper to measure the "diameter" of the conductor and then calculate the cross-sectional area , suitable for unstranded conductors or solid conductors; for tightly stranded power cables, the measurement error is large due to the existence of gaps during multi-strand twisting, and some cable conductors are not regular circular and cannot be used This method obtains the cross-sectional area of ​​the cable conductor; the weighing method has high accuracy and is applicable to all cables. The cost of the cable is high, and the sales and use of the power cable are seriously affected after cutting, and the operation is complicated and time-consuming. This method is rarely used in the application field; the DC resistance method is to reverse the cross-sectional area of ​​the conductor by measuring the DC resistance of the conductor. The damage to the cable is small, but the DC resistance of the conductor is also related to the length of the cable. Some manufacturers cheat on the area and length of the conductor at the same time. In this case, the DC resistance method will miss the detection.

[0004] Therefore, for the cross-sectional area indicators that cable users are concerned about, there is currently no fast, effective, and accurate detection method that can be applied on the construction site. detection

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