KR20150107355A - Apparatus for Detecting Surface Defect of Cable - Google Patents

Apparatus for Detecting Surface Defect of Cable Download PDF

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Publication number
KR20150107355A
KR20150107355A KR1020140030124A KR20140030124A KR20150107355A KR 20150107355 A KR20150107355 A KR 20150107355A KR 1020140030124 A KR1020140030124 A KR 1020140030124A KR 20140030124 A KR20140030124 A KR 20140030124A KR 20150107355 A KR20150107355 A KR 20150107355A
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South Korea
Prior art keywords
cable
inspection
unit
image
photographing
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KR1020140030124A
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Korean (ko)
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정용락
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정용락
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Publication of KR20150107355A publication Critical patent/KR20150107355A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
    • G01N21/894—Pinholes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
    • G01N21/898—Irregularities in textured or patterned surfaces, e.g. textiles, wood
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/952—Inspecting the exterior surface of cylindrical bodies or wires
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Wood Science & Technology (AREA)
  • Quality & Reliability (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

The present invention has a monitor and an operating plate and is provided with a cable and a cable for guiding the cables toward the inner inspection area so as to provide even illumination and photographing uniformly at all angles along the surface of the cable to broaden the detection area of the cable, A main body frame formed so as to be able to flow therein; A rolling guide portion fixedly installed on the main body frame and positioned on an inflow path of a cable introduced from the outside to movably support the cable; An illumination means for vertically symmetrically structuring the inspecting region of the body frame to irradiate light in a vertical direction toward the surface of the cable; And a photographing unit for photographing the image; A position adjuster for separately supporting the inspection portions of the vertically symmetrical structure and adjusting a position of the inspection portion in such a manner that the position of the inspection portion can be raised or lowered corresponding to a cable located in an inspection region of the main frame; And a defect detector for calculating the size and position of defects that deviate from the reference illuminance range from the image input from the inspection unit to determine whether the cable is defective and outputting the defect on the monitor.

Description

[0001] Apparatus for Detecting Surface Defect of Cable [0002]

The present invention relates to a cable surface defect detection apparatus and, more particularly, to a cable surface defect detection apparatus and method for detecting a cable surface defect, and more particularly, To a defect detecting apparatus.

Generally, during the production process of various types of cables such as enamel wires and various wires, inspection work is performed to detect defects of cables in order to prevent the production of defective products from defects such as lumps, bubbles, scratches, It must pass.

However, in the past, inspection was performed manually by the operator, such as checking with the naked eye or touching with the hand while waiting on the production line. However, due to the subjective variation depending on the operator, it is impossible to detect whether there is a minute defect on the surface of the cable There is a problem in that a reliable inspection operation is not performed as a whole, resulting in a large amount of defects and reliability of products.

Accordingly, a defective part detecting device for a cable using an eddy current is used by providing an agitated electric signal to the coil and measuring the amount of agitated electric signal which is damped by the eddy current induced in the metal when approaching the metal material.

However, in the defect inspection apparatus using the eddy current described above, it is difficult to precisely detect the defect due to the sensitive vibration due to the high speed progress of the cable because of the characteristics of the rolling operation. Therefore, the operator is visually inspecting the appearance of the product again.

Korean Patent Laid-Open Publication No. 7036/2007 (Jan. 17, 2005) discloses a conventional technique for solving the above-described problems. The base includes a base provided on a path of a continuously moving wire, A rotating shaft which is seated on a pair of support rolls installed inside the moving block, and a rotating member which is seated on the upper surface of the moving roll, A driving motor connected to either one of the pair of support rolls, a plurality of cameras equidistantly arranged on the circumferential surface of the rotary member, a monitor electrically connected to the camera to output an image photographed by the camera, And cooling means for spraying cooling water on the surface, thereby preventing the generation of mass quality defects in the work There is known a surface defect inspection apparatus for wire rods.

However, in the above-described conventional inspection apparatuses, there is no facility for photographing and inspecting wire rods or cables from a plurality of cameras, and for illuminating the cables at the time of photographing, so that the image sharpness of a video image by a camera is lowered, There is a problem that the detection accuracy is low.

In addition, in the related art, since the camera is configured to capture a cable after simply arranging the camera in correspondence with a cable, there is a limitation in the inspection area that only a partial surface inspection is possible because the photographing area that can be inspected from one camera is narrow, There is a problem that the shadow is displayed on the input image and obstructs the detection operation.

In addition, since the photographing position of the camera is conventionally fixed, it is difficult to focus the photographing of the camera according to cables of various sizes, and the productivity is deteriorated due to the delay of the operation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a means for taking a picture at a position separated from an illumination area together with a means for illuminating the entire circumference of the cable, It is an object of the present invention to provide a cable surface defect detection apparatus capable of improving the accuracy of detection of a cable defect and maximizing a detection region, as well as improving the sharpness of the cable.

In addition, since the present invention provides means for adjusting the position of the inspection equipment corresponding to the cable, it is possible to flexibly change the shooting focus according to various sizes of cable, And to provide a defect detecting apparatus.

A cable surface defect detection apparatus provided by the present invention comprises: a body frame having a monitor and an operation plate, the body frame being formed such that a cable can be introduced toward an inside inspection area; A rolling guide portion fixedly installed on the main body frame and positioned on an inflow path of a cable introduced from the outside to movably support the cable; An illumination means for vertically symmetrically structuring the inspecting region of the body frame to irradiate light in a vertical direction toward the surface of the cable; And a photographing unit for photographing the image; A position adjuster for separately supporting the inspection portions of the vertically symmetrical structure and adjusting a position of the inspection portion in such a manner that the position of the inspection portion can be raised or lowered corresponding to a cable located in an inspection region of the main frame; And a defect detector for calculating the size and position of defects that deviate from the reference illuminance range in the image input from the inspection unit to determine whether the cable is defective and outputting the defect on the monitor.

The rolling guide portion includes a support member fixed on the main frame and having a Y-shape, a guide roller mounted on the top of the support member in a mutually symmetrical manner and rotatably disposed in contact with the movement of the cable, .

The lighting unit of the inspection unit includes an illumination bracket fixedly mounted on the position adjusting unit and having an illumination area opened at both sides so as to allow a cable to flow therein, And a plurality of illumination sources which are uniformly arranged as a whole at 360 °.

The defect detection unit compares the image input from the photographing unit of the inspection unit with each region, calculates information on the image by region, compares the image with the previously stored reference image, Is applied as an output signal.

According to the cable surface defect detection apparatus of the present invention, the illumination means for irradiating the surface of the cable in the vertical direction with the illumination means and the imaging means mounted in the diagonal direction toward the illumination region are constituted to enhance the sharpness of the image for defect detection It is possible to detect a defect of a minute size easily, and it is possible to produce a good product with excellent accuracy of detection of the defect, and to obtain a effect of detecting a surface defect from the shadow of a defect while preventing a shadow by the photographing means from appearing in the input image .

In addition, since the cable surface defect detection apparatus according to the present invention constitutes a rolling guide portion that rotatably supports the cable from the feed force of the cable, it is possible to smoothly move the cable, thereby improving the productivity of the entire product from the quick detection process have.

In addition, since the cable surface defect detecting apparatus according to the present invention comprises the position adjusting unit capable of raising and lowering the position of the inspection unit, it is easy to set the center between the cable and the inspection unit, And the workability can be greatly improved by changing the elastic position according to the cable.

1 is a front sectional view showing an embodiment according to the present invention.
2 is a side sectional view showing an embodiment according to the present invention.
3 is a configuration diagram showing lighting means of an inspection unit according to an embodiment of the present invention;
4 is a configuration diagram showing a photographing means of an inspection unit according to an embodiment of the present invention;
5 is a front sectional view showing a use state of the position adjusting unit according to an embodiment of the present invention.

A main body frame having a monitor and an operating plate and being formed such that a cable can be introduced toward the inside examination area; A rolling guide portion fixedly installed on the main body frame and positioned on an inflow path of a cable introduced from the outside to movably support the cable; An illumination means for vertically symmetrically structuring the inspecting region of the body frame to irradiate light in a vertical direction toward the surface of the cable; And a photographing unit for photographing the image; A position adjuster for separately supporting the inspection portions of the vertically symmetrical structure and adjusting a position of the inspection portion in such a manner that the position of the inspection portion can be raised or lowered corresponding to a cable located in an inspection region of the main frame; And a defect detector for calculating the size and position of defects out of the reference illuminance range from the image input from the inspection unit to determine whether the cable is defective and outputting the defect on the monitor. do.

The rolling guide portion includes a support member fixed on the main frame and having a "Y" shape, a guide mounted on the upper end of the support member in a mutually symmetrical manner, A cable surface defect detecting apparatus including a roller is characterized by the technical construction.

The illumination unit of the inspection unit may include an illumination bracket fixedly mounted on the position adjustment unit and having an illumination area opened at both sides so as to allow the cable to flow therethrough, And a plurality of illumination sources uniformly arranged at an angle of 360 degrees with respect to the reference plane.

In addition, in the defect detection unit, the image input from the photographing means of the inspection unit is binarized for each region to calculate information on the image information for each region, and the information is compared with the reference image stored as the detection object information, And an output signal for determining an area of the image as an object to be detected is applied to the cable surface defect detection device.

Next, a preferred embodiment of a cable surface defect detecting apparatus according to the present invention will be described in detail with reference to the drawings.

1 and 2, a cable surface defect detection apparatus according to an embodiment of the present invention includes a main body frame 10, a rolling guide unit 20, an inspection unit 30, a position control unit 40, and a defect detector 50. [

As shown in FIG. 1, the main body frame 10 has a structure in which the structures of the present invention, which are divided into an inside out and a outside out, are mountable. For example, the main body frame 10 has a space in which the main components such as the inspection unit 30 and the position adjustment unit 40 are disposed, such as the rolling guide unit 20, On the outside of the main body frame 10, there are provided a monitor 11 and an operating plate 13 which can manipulate or confirm the operation state from the operator.

The monitor 11 is mounted on the upper side of the front of the body frame 10 in accordance with the eye level of the operator and is capable of outputting the inspection information detected through the inspection unit 30 through the defect detection unit 50 A character or numerical information including image information is outputted and configured to be structured so as to be verifiable from the operator.

It is preferable that the operation plate 13 is mounted on the front of the main body frame 10 so as to be positioned on a height at which an input operation according to an operator can be smoothly performed.

The operation plate 13 is preferably mounted on the body frame 10 so as to be rotatable. That is, when the operation plate 13 is used, it is mounted on the main body frame 10 so as to maintain the folded state in the unused state with respect to the operation plate 13, So that the operator can easily operate the apparatus.

The body frame 10 is formed with an inspection region T1 on the inner side thereof. That is, the main body frame 10 is provided with an inspection area T1 having a structure in which a cable can flow into the inside of the inspecting unit 30, so that the cable can be detected.

The inspection area T1 has a structure in which both side surfaces of the main body frame 10 are opened so that a cable linearly moving in one direction can flow in and out from the outside.

The rolling guide unit 20 serves to movably support a cable introduced into the inspection area T1 of the main frame 10. [

The rolling guide unit 20 is installed on the main frame 10 so as to be positioned on the inflow path of the cable flowing from the outside into the inspection area T1.

As shown in FIG. 1, the rolling guide portions 20 are located within the main body frame 10 at mutually spaced intervals, and two pairs of the rolling guide portions 20 are formed. That is, the rolling guide portion 20 is provided at a position where the cable flows into the main frame 10, and at a position where the cable flows out from the main frame 10.

The rolling guide unit 20 includes a support member 21 fixedly mounted on the main frame 10 and a guide roller 23 rotatably mounted on the upper end of the support member 21.

The support member 21 is formed in such a shape as to be able to easily support the lower side of the cable having a circular sectional shape and to have a "Y" shape.

Since the support member 21 is configured to adjust the position of the guide roller 23 up and down, it is also possible to change the support position for the cable size and type.

The guide roller 23 is configured to be symmetrical to the left and right on the upper end of the support member 21.

The guide roller 23 is rotatably connected to the support member 21. That is, the guide roller 23 is rotatably provided in a surface contact with the movement of the cable.

It is preferable that a sheet-like material (for example, a urethane foam material or the like) is applied to the outer circumferential surface of the guide roller 23 to improve the moving performance of the cable.

By constructing the rolling guide portion 20 that rotatably supports the cable from the feeding force as described above, it is possible to smoothly move the cable and improve the productivity of the entire product from the quick detection process.

The inspecting unit 30 inspects the surface of the cable and detects whether or not the cable is defective.

1 and 2, the inspection unit 30 includes an illumination unit 31 that irradiates light to a cable located in the inspection area T1 of the body frame 10, And photographing means 35 for photographing the surface of the illuminated cable.

The illuminating means 31 and the photographing means 35 constituting the inspection unit 30 are vertically divided into a vertical structure and a vertical structure with respect to the inspection region T1 of the body frame 10, Structure.

The lighting unit 31 is configured to irradiate light in a vertical direction toward the surface of the cable located in the inspection area T1 of the main body frame 10, And an illumination source 33 mounted on the illumination bracket 32 so as to emit light.

As shown in Figs. 1 and 2, the lighting bracket 32 has an illumination area T2 in which both sides are opened so that a cable can be introduced. That is, the illumination bracket 32 has an illumination area T2 that supports the illumination source 33 and is a space through which light can be irradiated by the illumination source 33, And the side surface is opened so that the cable can be taken from the photographing means 35 as well as the cable.

A plurality of the illumination sources (33) are provided on the illumination bracket (32). That is, as shown in FIG. 3, a total of 16 illumination sources 33 (see FIG. 3) are provided from the illumination bracket 32 having eight illumination sources 33 at various angles on a single illumination bracket 32, ).

As shown in FIG. 3, the illumination sources 33 are arranged on the illumination bracket 32 at regular intervals. The illumination sources 33 are arranged in the inspection area T1 of the main frame 10, So as to be uniformly illuminated on the surface as a whole.

It is preferable that the illumination source 33 includes an LED lamp 33a for generating a light source and a cover member 33b for diffusing light according to the light source of the LED lamp 33a toward the cable .

The LED lamp 33a may be configured to have a structure in which a plurality of LED lamps 33a are arranged in one of the illumination sources 33. That is,

The cover member 33b may be made of a synthetic resin material such as polycarbonate (PC) resin.

As shown in FIG. 1, the photographing means 35 photographs the illuminated region T2 illuminated from the illuminating means 31, and photographs the illuminated region T2 in a diagonal direction with respect to the surface of the cable.

1 and 4, the photographing means 35 is provided with a support bracket 36 fixedly installed on the position adjusting portion 40. The photographing means 35 is provided on the support bracket 36, And a plurality of inspection cameras 38 are installed so that they can be photographed at various angles on the basis of the inspection cameras 38.

A plurality of inspection cameras 38 are installed on the support bracket 36. That is, as shown in FIG. 4, the inspection camera 38 includes three inspection cameras 38 on one support bracket 36, and has six inspection cameras 38 .

The inspection camera 38 photographs a cable located in the inspection area T1 and detects the cable surface of the part of the cable located in the illumination area T2 of the lighting unit 31, To 35 [deg.].

The position adjusting unit 40 is configured to vertically and separately support the inspection unit 30 having a vertically symmetrical structure. That is, the position adjusting unit 40 is configured to support the structure of the inspection unit 30 located on the upper side of the inspection area T1 of the inspection unit 30, So as to support the configuration of the inspection unit 30 located on the lower side with respect to the inspection unit 30.

The position adjustment unit 40 adjusts the position of the inspection unit 30 on the basis of a cable located within the inspection area T1 so that the position of the inspection unit 30 can be elevated up and down.

The position adjusting unit 40 drives the position adjusting unit 30 to adjust the position of the checking unit 30 in accordance with the cable located in the inspection area T1 of the body frame 10. [ That is, the position adjusting unit includes a fixed frame 41 fixedly installed on the main body frame 10, and a lift frame 43 (see FIG. 1) supporting the lighting unit 31 and the photographing unit 35 of the inspection unit 30 integrally And an elevation driving means 45 for applying an elevation power to the elevating frame 43. [

The lifting and lowering frame 43 is vertically movable from the fixed frame 41 toward the direction in which the cable is positioned.

The lifting frame 43 supports the lighting means 31 and the photographing means 35 of the inspection unit 30 so as to be disposed on positions corresponding to each other at a predetermined interval. That is, the lifting frame 43 supports the lighting means 31 and the photographing means 35 in a moving direction of the cable so that the lighting means 31 and the photographing means 35 are disposed at a certain distance from each other.

The elevation driving means (45) is configured to apply elevating power to the elevating frame (43).

1 and 2, the lifting and driving means 45 includes a lifting cylinder 43 fixed on the fixed frame 41 and having one end connected to the lifting frame 43 to transmit power, 46, and a guiding unit 47 fixedly mounted on the lifting frame 43 and guiding vertical movement.

The guide means 47 includes a circular bar-shaped guide bar 47a having a structure extending toward the fixed frame 41 and a vertical bar-shaped guide bar 47a vertically moving the guide bar 47a in accordance with the driving of the elevating cylinder 46. [ And a guide member 47b for guiding the guide member 47b.

It is preferable to configure the guide means 47 so as to have two left and right sides with respect to the elevating cylinder 46.

As described above, the position adjusting unit 40, which can elevate the position of the checking unit 30, can easily set the center between the cable and the inspection unit 30 and can easily set the photographing focus of the photographing unit 35 It is possible to improve the detection efficiency of surface defects and greatly improve the workability by changing the elastic position according to the cable.

The defect detector 50 calculates a size and a position of defects that deviate from the reference illuminance range in the image input from the inspection unit 30 to determine whether the cable is defective or not.

The defect detector 50 is configured to be programmed in an industrial PC provided on one side of the main body frame 10.

The defect detection unit 50 processes the image input from the inspection camera 38 of the photographing means 35. That is, the defect detector 50 removes the noise on the image inputted according to the image signal, divides the image inputted from the photographing unit 35 of the inspection unit 30 by each region, and outputs a threshold value value for each region, And then binarize the whole image.

The defect detection unit 50 detects defects in the cable from the binarized region image. The defect detection unit 50 finds a set of pixels forming a closed curve in the image, calculates information on the area, size, and shape of each set, And outputs an output signal for determining an area of the image to be detected only when the detected information is compared with the stored reference image.

The detection result determined by the defect detection unit 50 applies a signal to be output on the monitor 11.

The defect detector 50 records and stores data of an input image and detection contents, and records and stores information data such as a cable position and a detection time.

5, the cable, which is movable from the outside, is positioned on the guide roller 23 of the rolling guide portion 20 and is moved to the inspection region T1 The introduced cable is irradiated by the lighting means 31 of the inspection portion 30 to illuminate the surface and to illuminate the surface of the illuminated cable in the illumination region T2 by the photographing means 35 of the inspection portion 30 And detects whether or not surface defects are present. The inspection unit 30 drives the lifting cylinder 46 of the position adjustment unit 40 to move the illumination unit 31 and the image pickup unit 35 of the inspection unit 30 up and down. . Thereafter, the defect image is photographed by the defect inspection unit 30, and the defect image is compared with the reference image to detect the result of the surface defect, and the defect image is output on the monitor 11.

In other words, according to the cable surface defect detection apparatus of the present invention configured as described above, since the lighting means for irradiating the surface of the cable in the vertical direction and the photographing means mounted in the oblique direction toward the illumination region are constituted, It is possible not only to detect a defect of a minute size easily but also to improve the detection accuracy of the defect so as to produce a good product and to prevent a shadow caused by a photographing means from appearing in an input image, Can be detected.

Although the preferred embodiments of the cable surface defect detection apparatus according to the present invention have been described above, the present invention is not limited thereto, but can be variously modified and embodied within the scope of the claims, the specification of the present invention and the accompanying drawings , Which are also within the scope of the present invention.

10: main body frame 11: monitor 13: operating plate
20: Rolling guide portion 21: Support member 23: Guide roller
30: Inspection unit 31: Lighting means 32: Lighting bracket
33: illumination source 33a: LED lamp 33b: cover member
35: photographing means 36: support bracket 38: inspection camera
40: position adjusting section 41: fixed frame 43: lift frame
45: lifting drive means 46: lifting cylinder 47: guide means
47a: Guide bar 47b: Guide member 50: Defect detection part
T1: inspection area T2: illumination area α: inclination angle of the inspection camera

Claims (4)

A main body frame having a monitor and an operation plate and formed so that a cable can flow into the inside inspection area;
A rolling guide portion fixedly installed on the main frame and positioned on an inflow path of a cable introduced from the outside to movably support the cable;
An illumination means for vertically symmetrically structuring the inspecting region of the body frame to irradiate light in a vertical direction toward the surface of the cable; And a photographing unit for photographing the image;
A position adjuster for separately supporting the inspection portions of the vertically symmetrical structure and adjusting a position of the inspection portion in such a manner that the position of the inspection portion can be raised or lowered corresponding to a cable located in an inspection region of the main frame;
And a defect detector for calculating the size and position of defects that deviate from the reference illuminance range from the image input from the inspection unit to determine whether the cable is defective and outputting the defect on the monitor.
The method according to claim 1,
The rolling guide portion includes a support member fixed on the main frame and having a "Y" shape, a guide mounted on the upper end of the support member to be symmetrical with respect to each other, And a roller.
The method according to claim 1,
The lighting unit of the inspection unit includes an illumination bracket fixedly mounted on the position adjusting unit and having an illumination area having both sides open so as to allow the cable to flow therein, And a plurality of illumination sources uniformly arranged at an angle of 360 degrees with respect to the cable surface defect detection device.
The method according to claim 1,
The defect detection unit compares the image input from the photographing unit of the inspection unit with each region, calculates information on the image by region, compares the image with the previously stored reference image, Is applied to the cable surface defect detection device.
KR1020140030124A 2014-03-14 2014-03-14 Apparatus for Detecting Surface Defect of Cable KR20150107355A (en)

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CN107764224A (en) * 2017-11-22 2018-03-06 长飞光纤光缆四川有限公司 A kind of optical cable defect inspection method and system
CN109030514A (en) * 2018-08-15 2018-12-18 河海大学 Power station surge shaft defect detecting device
CN109030514B (en) * 2018-08-15 2024-03-26 河海大学 Hydropower station surge shaft defect detection device
US11403743B2 (en) * 2018-11-30 2022-08-02 Tyco Electronics (Shanghai) Co. Ltd. Cable detection apparatus
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