CN114235944A - Stay cable magnetic flux leakage nondestructive testing device and method based on light source signals - Google Patents
Stay cable magnetic flux leakage nondestructive testing device and method based on light source signals Download PDFInfo
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 124
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- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 22
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- 238000001514 detection method Methods 0.000 claims abstract description 54
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- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims description 2
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Abstract
The invention relates to the field of bridge engineering, and discloses a guy cable magnetic flux leakage nondestructive testing device based on a light source signal, which comprises an excitation device arranged on a guy cable to be tested, wherein the excitation device is U-shaped, a magneto-optical detection assembly sleeved on the guy cable to be tested is arranged in the U-shaped excitation device through a connecting piece, and the excitation device and the magneto-optical detection assembly can synchronously move and rotate along the axial direction of the guy cable to be tested; the magneto-optical detection assembly comprises a shell, a power supply board, a magnetic conduction layer, a light source emitter, a light source receiver and side plates, wherein the shell is sleeved outside the magnetic conduction layer, the shell and the magnetic conduction layer are connected into a whole through the side plates on two axial sides, the power supply board and the light source emitter are sequentially arranged on the inner side of the shell, and the power supply board and the light source receiver which is arranged opposite to the light source emitter arranged on the shell are sequentially arranged on the outer side of the magnetic conduction layer. The invention can judge the defects only through the light source signal without collecting the magnetic leakage signal, thereby avoiding the loss in the signal conversion process. The invention also provides a nondestructive testing method for the inhaul cable magnetic flux leakage based on the light source signal.
Description
Technical Field
The invention relates to the field of bridge engineering, electronic technology and sensing technology, and provides a guy cable magnetic flux leakage nondestructive testing device and method based on light source signals.
Background
In the use process of the existing in-service bridge, stress fatigue and environmental corrosion of the structure often occur, and then certain health problems are generated. The guy cable is an important stressed component of a cable structure system bridge, and in order to ensure the safety, reliability and stability of the bridge structure in the operation period, the guy cable is regularly monitored and detected. In recent years, the inhaul cable detection method in the industry mainly comprises visual detection, ultrasonic detection, magnetic powder detection, magnetostrictive guided wave detection and magnetic flux leakage detection. The magnetic flux leakage detection method has the advantages of low requirement on the surface cleanliness of the stay cable, no need of contact of a detection device, convenient manual operation and controllable cost, and the technology is slightly mature in the nondestructive detection method of the stay cable.
The magnetic leakage detection is to magnetize the stay rope by using a magnetic source, and if the surface has defects such as cracks or cavitation, the magnetic permeability of a defect area is reduced, the magnetic resistance is increased, and a part of the energy of a magnetization field leaks out of the area to form a detectable magnetic leakage signal. When the magnetic force lines in the guy cable meet the defects to generate ferromagnetic discontinuity, the magnetic force lines can be focused or distorted, and the distortion is diffused to the surface of the material to form a detectable magnetic field signal. The leakage flux detection can realize quantitative inspection, the detection range is not limited by the thickness of a detected piece, meanwhile, certain characteristic dimensions (such as size, length and the like) of defects can be known according to signal processing, and as the leakage flux detection devices are all automatic devices, objective experiment results which are not influenced by the technical level of operators can be obtained. However, the detection probes of the magnetic leakage detection method are all traditional hall elements, the working mechanism of the magnetic leakage detection method is to output acquired magnetic leakage signals as electric signals, and the positions and sizes of defects are judged according to the amplitude of the electric signals. The signal accuracy is affected by the interference of more factors in the acquisition process, such as background magnetic field, noise caused by machine vibration, low signal-to-noise ratio of the traditional Hall element probe and the like. The leakage magnetic signals are weak and difficult to collect, and need to be converted into electric signals to be compared with each other to draw a conclusion, and the loss of the signals in the conversion process is large.
Therefore, how to reduce the interference factor during detection; traditional detection devices with low signal-to-noise ratios are avoided; the novel detection method for searching the magnetic leakage signal collects a certain signal which can be directly output and obtains a conclusion, and the step of signal conversion is avoided; and the improvement of the detection sensitivity and precision has very important engineering significance and practical value.
Disclosure of Invention
In view of this, the present invention provides a device and a method for nondestructive testing of cable flux leakage based on a light source signal, and aims to solve the problems that the conventional hall sensor cannot avoid interference factors and has low sensitivity and precision in the moving process.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a guy cable magnetic flux leakage nondestructive testing device based on a light source signal, which comprises an excitation device arranged on a guy cable to be tested, wherein the excitation device is in a U-shaped structure, a magneto-optical testing component sleeved on the guy cable to be tested is arranged in the U-shaped interior of the excitation device through a connecting piece, and the excitation device and the magneto-optical testing component can synchronously move and rotate along the axial direction of the guy cable to be tested; the magneto-optical detection assembly comprises a shell, a power supply board, a magnetic conduction layer, a light source emitter, a light source receiver and side plates, wherein the shell is sleeved outside the magnetic conduction layer, the shell and the magnetic conduction layer are connected into a whole through the side plates on two axial sides, the power supply board and the light source emitter are sequentially arranged on the inner side of the shell, and the power supply board and the light source receiver which is arranged opposite to the light source emitter arranged on the shell are sequentially arranged on the outer side of the magnetic conduction layer.
Further, the exciting device is by armature, S utmost point magnet under last N, N utmost point magnet under last S, the electric coil, take gyro wheel magnetic conduction connecting block to constitute, S utmost point magnet and last S utmost point magnet under last N that the homonymy was arranged are divided to armature length direction' S both sides, and S utmost point magnet and last S utmost point magnet are all setting up the end of deviating from of armature and are acting on the gyro wheel magnetic conduction connecting block of taking on waiting to examine the cable under last N utmost point magnet and last S utmost point magnet, S utmost point magnet and last S utmost point magnet all twine the electric coil under last N.
Furthermore, a connecting piece is arranged on the armature, and the connecting piece adopts a non-magnetic material; the magnetic conduction connecting block with the roller adopts permalloy with magnetic conductivity higher than air, and the magnetic conduction connecting block with the roller is provided with a concave arc surface matched with the excircle of the stay rope to be detected facing to the corresponding end of the stay rope to be detected.
Further, the sizes of the upper N-pole magnet, the lower N-pole magnet, the upper S-pole magnet, the lower S-pole magnet and the upper S-pole magnet and the lower N-pole magnet and the number of turns of the electric coil are determined by the number of steel strands inside the stay cable to be detected, and the stay cable to be detected is enabled to reach a magnetic saturation state.
Furthermore, the power panel adopts a flexible PCD electric panel and is internally provided with a wireless communication module.
Furthermore, the shell and the side plates are all provided with magnetic shielding light shading plates.
Furthermore, the shell, the magnetic conduction layer and the side plates are arranged into an open-loop type two-petal structure, and detachable fasteners are arranged on circumferential seals corresponding to the shell.
Further, the light source emitters and light source receivers are arranged in a lattice distribution structure and are arranged relative to the axial full length of the shell and radial 1/4-1/2 arc lengths.
Further, the light source receiver of a single point is composed of a magnetic liquid film, a cavity and a spectrometer probe, wherein the magnetic liquid film faces the light source emitter, and the spectrometer probe is located in the cavity, below the magnetic liquid film and faces the magnetic conduction layer.
Furthermore, the thickness of the magnetic liquid film is 18-22 microns, one or more of ferroferric oxide, ferric oxide, Co or Ni is selected as magnetic particles, and water is used as base liquid.
The invention also discloses a nondestructive testing method for the inhaul cable magnetic flux leakage based on the light source signal, which is implemented by utilizing the testing device and comprises the following steps:
1) the detection device is sleeved on a to-be-detected inhaul cable and then is brought to an appointed position by a cable climbing robot;
2) starting a light source emitter, collecting the wavelength N1 where the first group of counts peak values are located by a spectrometer probe, outputting the wavelength N1 to be recorded at a PC (personal computer) end, and solving the light transmittance T1 at the peak values;
3) starting an excitation device, enabling the stay cable to be detected to reach a magnetic saturation state, then collecting the wavelength N2 where the second group of counts peak values are located again by the probe of the spectrograph, outputting the wavelength N2 to be recorded at the PC end, and obtaining the light transmittance T2 at the peak values;
4) comparing the two groups of wavelengths and the light transmittance, and finding out a position with larger difference in the dot matrix, namely the defect position of the detection area;
5) after the first rectangular area signal is collected, the excitation device is closed, the magnetic conduction connecting block with the roller is driven by the motor to rotate circumferentially, and the power supply of the excitation device is turned on after the signal reaches the next detection area, so that the annular area can be detected;
6) above-mentioned flow is so repeated, accomplishes to examining after examining the cable top and detects.
The invention has the beneficial effects that: the guy cable magnetic flux leakage nondestructive testing device based on the light source signal greatly solves the problems that the traditional Hall element sensor cannot avoid interference factors and has low sensitivity and precision in the moving process; through optimizing the collection mode that traditional magnetic leakage detection need gather the magnetic leakage signal and turn into the signal of telecommunication again to can guarantee simultaneously that precision, sensitivity are high, and the interference killing feature ability is strong, still need not gather the magnetic leakage signal and can judge the defect, avoid the loss on the way of the signal conversion, have good application prospect.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a three-dimensional schematic diagram of the nondestructive testing device of the present invention;
FIG. 2 is a schematic front view of FIG. 1;
FIG. 3 is a schematic axial cross-section of FIG. 1;
FIG. 4 is a three-dimensional view of a light source emitter having a lattice structure;
FIG. 5 is a three-dimensional view of a light source receptor having a lattice structure;
FIG. 6 is a detailed view of a lattice light source receiver;
FIG. 7 is an open loop schematic;
FIG. 8 is a schematic view of the operation of the actuator;
FIG. 9 is a schematic view of the defect-free inspection operation;
FIG. 10 is a schematic diagram of the working principle of defect detection;
reference numerals: the device comprises an excitation device 1, a connecting piece 2, a magneto-optical detection component 3 and a stay cable to be detected 4; 1-1 armature, 1-2 upper N and lower S pole magnets, 1-3 upper S and lower N pole magnets, 1-4 electric coils and 1-5 magnetic conduction connecting blocks with rollers; 3-1 parts of a shell, 3-2 parts of a power panel, 3-3 parts of a magnetic conduction layer, 3-4 parts of a light source emitter, 3-5 parts of a light source receiver, 3-6 parts of a circumferential seal, 3-7 parts of a fastener and 3-8 parts of a side plate; 3-51 parts of magnetic liquid film, 3-52 parts of cavity and 3-53 parts of spectrometer probe.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in FIGS. 1-8, the nondestructive testing device for cable flux leakage based on light source signals in the present embodiment is composed of an excitation device 1, a connecting member 2, and a magneto-optical testing assembly 3. Wherein, excitation device 1 is established on waiting to examine cable 4, is U type structure, and excitation device 1's U type is inside to set up the cover through connecting piece 2 and to examine optomagnetic detection subassembly 3 on examining cable 4, and excitation device 1 and optomagnetic detection subassembly 3 homoenergetic are followed and are examined 4 axial of cable and be synchronous motion and rotate.
The excitation device 1 includes: the magnetic cable comprises an armature 1-1, an upper N lower S pole magnet 1-2, an upper S lower N pole magnet 1-3, an electric coil 1-4 and a magnetic conduction connecting block with a roller 1-5, namely the armature is divided into three parts on the basis of a U-shaped magnet, the two sides of the length direction of the armature 1-1 are respectively provided with the upper N lower S pole magnet 1-2 and the upper S lower N pole magnet 1-3 which are fixedly connected with one side, the upper N lower S pole magnet 1-2 and the upper S lower N pole magnet 1-3 are respectively provided with the magnetic conduction connecting block with the roller 5 which is acted on the cable 4 to be detected at the deviating end deviating from the armature 1-1, the upper N lower S pole magnet 1-2 and the upper S lower N pole magnet 1-3 are respectively wound with the electric coil, and the roller can be attached to the surface of the cable 4 to be detected and driven by the motor to rotate circumferentially.
The magneto-optical detection assembly 3 includes: 3-1 parts of a shell, 3-2 parts of a power panel, 3-3 parts of a magnetic conduction layer, 3-4 parts of a light source emitter, 3-5 parts of a light source receiver, 3-6 parts of a circumferential seal, 3-7 parts of a fastener and 3-8 parts of a side plate; the shell 3-1 is sleeved outside the magnetic conduction layer 3-3 and is connected into a whole through side plates 3-8 at two axial sides, a power supply plate 3-2 and a light source emitter 3-4 are sequentially arranged on the inner side of the shell 3-1, and another power supply plate 3-2 and a light source receiver 3-5 which is arranged opposite to the light source emitter 3-4 arranged on the shell 3-1 are sequentially arranged on the outer side of the magnetic conduction layer 3-3. Namely, the photo-magnetic detection component 3 is divided into a first interface formed by a shell 3-1 and a power panel 3-2 and a second interface formed by another power panel 3-2 and a magnetic conduction layer 3-3 from outside to inside, a rectangular area on the first interface is provided with a light source emitter 3-4 of a multiplied by b, and a corresponding projection rectangular area on the second interface is provided with a light source receiver 3-5 of a multiplied by b, so as to ensure that a light emitting end and a light receiving end are in radial one-to-one correspondence. Thus, light source emitters 3-4 and light source receptors 3-5 are each arranged in a matrix configuration and are disposed relative to housing 3-1 for the full axial length and radial directions 1/4-1/2 arc lengths.
In this embodiment, the casing 3-1, the magnetic conduction layer 3-3, and the side plate 3-8 are designed as an open-loop two-segment structure, and the detachable fasteners 3-7 are disposed on the circumferential seals 3-6 corresponding to the casing 3-1. Namely, the circumferential end parts of the two interfaces are fixedly connected by circumferential seals 3-6, and the axial end parts of the two interfaces are fixedly connected by side plates 3-8; thus, the magneto-optical detection component can be arranged in an open loop mode, locked and unlocked by the detachable fasteners 3-7 and sleeved on the stay cable 4 to be detected. And the shell 3-1 and the side plates 3-8 are made of magnetic shielding light shading plates. The fasteners 3-7 are bolt-and-nut members.
In the embodiment, a connecting piece 2 is arranged on an armature 1-1 of an excitation device 1, and the bottom surface of the connecting piece 2 is fixedly connected with the surface of a shell 3-1 of a magneto-optical detection component 3, so that the excitation device 1 and the magneto-optical detection component 3 always keep an integral structure during circumferential rotation and cable climbing. And the connecting piece 2 adopts non-magnetic conductive material.
In the embodiment, the sizes of the upper N-pole magnet 1-2, the lower S-pole magnet 1-3, the upper S-pole magnet 1-3 and the lower S-pole magnet 1-4 and the number of turns of the electric coils 1-4 are determined according to the number of steel strands inside the stay cable 4 to be detected, so that the stay cable 4 to be detected can be ensured to reach a magnetic saturation state.
The light source receiver 3-5 of single point of dot matrix in this embodiment is composed of magnetic liquid film 3-51, cavity 3-52, spectrometer probe 3-53, the magnetic liquid film 3-51 faces the light source emitter 3-4, the spectrometer probe 3-53 is in the cavity 3-52 and under the magnetic liquid film 3-51 and faces the magnetic conduction layer 3-3. The thickness of the magnetic liquid film 3-51 is 20 microns, one or more of ferroferric oxide, ferric oxide, Co or Ni is selected as magnetic particles, and water is selected as base liquid.
The power panel 3-2 in this embodiment adopts a flexible PCD electric board, and a wireless communication module is arranged in the power panel and connected with an external PC terminal, so as to ensure signal transmission received by a spectrometer probe.
The magnetic conductive connecting blocks 1-5 with the rollers in the embodiment adopt permalloy with the magnetic conductivity higher than that of air, and the size of the permalloy changes along with the outer diameter of the stay cable 4 to be detected.
The side plates 3-8 in this embodiment are provided with balls in the radial direction of the corresponding surface facing the stay 4 to be detected, so that the magneto-optical detection assembly can slide and rotate on the stay to be detected. And the ball is made of magnetic shielding and shading materials.
With reference to fig. 9-10, the following working principle of the present invention is explained in detail:
the stay cable magnetic flux leakage nondestructive testing device based on the light source signal is pre-installed in the cable climbing robot, when the stay cable to be tested is subjected to health detection, a bolt-nut fastener is detached, and the stay cable is sleeved on the end portion of the stay cable to be tested and then locked in a closed loop mode. The outer surface of the magneto-optical detection assembly is shielded, and the interior of the magneto-optical detection assembly is always kept in a dark state. After the power supply is started, the cable climbing robot drives the detection device to rise in a fixed value, and the rising distance of each section is the axial length of the annular detection device. When the cable climbing robot reaches a designated area, the lattice light source emitters start to work, light source signals emitted by the lattice light source emitters are equal in size and constant, and after the light source signals are collected by the lattice light source receivers corresponding to the radial direction, the spectrometer probe obtains the wavelength N1 where the first group of counts peak values are located and outputs the wavelength N1 to be recorded at the PC end, and the light transmittance T1 at the peak values is obtained. At the moment, the excitation device is electrified, and the excited magnetic force line forms a magnetic force line closed loop in the armature → permalloy → upper N and lower S pole magnets → the cable to be tested → upper S and lower N pole magnets → permalloy → the armature, so that the cable to be tested is ensured to be in a magnetic saturation state. Because the magnetic shielding materials are coated on the surfaces of the electromagnet shell and the seal, magnetic lines of force can be reflected by the electromagnet shell and the seal, and the excitation magnetic field can not generate magnetic force action on the magnetic liquid film inside. When the magnetic force lines meet the defect of the rectangular area position where the dot matrix light source is located, the magnetic force lines are focused or distorted, the distortion is diffused to the surface of the material to form a leakage magnetic field, and the magnetic conduction layer close to the surface of the inhaul cable guides the magnetic force lines to be radially diffused and not to be dispersed. At the moment, the magnetic liquid film in the dot matrix light source receiver near the leakage magnetic field can be under the action of magnetic force, and the magnetic particles which are originally arranged in a disordered way are guided to be regularly arranged along the leakage magnetic field. The light source signal at the moment is collected by the corresponding radial lattice light receiver, the spectrometer obtains the wavelength N2 where the second group counts peak value is located, the wavelength is output and recorded at the PC end, and the light transmittance T2 at the peak value is obtained. And comparing the two groups of light transmittance and the two groups of wavelengths of each point in the array to obtain the position and the size of the defect in the rectangular area. And after the first rectangular area signal is acquired, the power supply of the excitation device is turned off, and the magnetic particles recover the disordered arrangement. At this moment, the magnetic conduction connecting block with the roller is driven by the motor to rotate circumferentially, and the power supply of the excitation device is turned on after the magnetic conduction connecting block reaches the next detection area, so that the first section of annular area can be detected. Above-mentioned flow is so repeated, accomplishes the cable health detection after waiting to examine the cable top.
The acquisition of the light source signal in the magnetic flux leakage detection process is not interfered by a background magnetic field and machine vibration; a detection probe with low signal-to-noise ratio is not required; the signal conversion is not needed after the detection of the magnitude of the magnetic leakage; the method has the advantages of high precision, high sensitivity and signal straightening.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A guy cable magnetic flux leakage nondestructive testing device based on a light source signal comprises an excitation device (1) arranged on a guy cable (4) to be tested, and is characterized in that the excitation device is of a U-shaped structure, a magneto-optical detection assembly (3) sleeved on the guy cable to be tested is arranged in the U-shaped of the excitation device through a connecting piece (2), and the excitation device and the magneto-optical detection assembly can synchronously move and rotate along the axial direction of the guy cable to be tested; the magneto-optical detection assembly comprises a shell (3-1), a power panel (3-2), a magnetic conduction layer (3-3), a light source emitter (3-4), a light source receiver (3-5) and side plates (3-8), wherein the shell is sleeved outside the magnetic conduction layer, the shell and the magnetic conduction layer are connected into a whole through the side plates on two axial sides, the power panel and the light source emitter are sequentially arranged on the inner side of the shell, and the power panel and the light source receiver arranged opposite to the light source emitter arranged on the shell are sequentially arranged on the outer side of the magnetic conduction layer.
2. The cable magnetic flux leakage nondestructive testing device based on the light source signal as claimed in claim 1, wherein the excitation device is composed of an armature (1-1), an upper N lower S pole magnet (1-2), an upper S lower N pole magnet (1-3), an electric coil (1-4) and a magnetic conduction connecting block (1-5) with a roller, the two sides of the armature in the length direction are respectively provided with an upper N lower S pole magnet and an upper S lower N pole magnet which are arranged on the same side, the upper N lower S pole magnet and the upper S lower N pole magnet are respectively provided with a magnetic conduction connecting block with a roller, which is acted on the cable to be tested, at the deviating end deviating from the armature, and the upper N lower S pole magnet and the upper S lower N pole magnet are respectively wound with an electric coil.
3. The guy cable magnetic flux leakage nondestructive testing device based on the light source signal is characterized in that a connecting piece is arranged on the armature, and the connecting piece is made of a non-magnetic material; the magnetic conduction connecting block with the roller adopts permalloy with magnetic conductivity higher than air, and the magnetic conduction connecting block with the roller is provided with a concave arc surface matched with the excircle of the stay rope to be detected facing to the corresponding end of the stay rope to be detected.
4. The light source signal-based cable flux leakage nondestructive testing device of claim 2, wherein the sizes of the upper N lower S pole magnet and the upper S lower N pole magnet and the number of turns of the electric coil are determined by the number of steel strands inside the cable to be tested, and the cable to be tested is enabled to reach a magnetic saturation state.
5. The guy cable magnetic flux leakage nondestructive testing device based on the light source signal is characterized in that the power panel adopts a flexible PCD (personal digital assistant) power panel, and a wireless communication module is arranged in the power panel.
6. The guy cable magnetic flux leakage nondestructive testing device based on the light source signal is characterized in that the shell and the side plates are both provided with magnetic shielding light shielding plates.
7. The guy cable magnetic flux leakage nondestructive testing device based on the light source signal is characterized in that the outer shell, the magnetic conduction layer and the side plates are arranged into an open-loop two-petal structure, and detachable fasteners (3-7) are arranged on circumferential seals (3-6) corresponding to the outer shell.
8. The guy cable magnetic flux leakage nondestructive testing device based on the light source signal is characterized in that the light source emitter and the light source receiver are both in a lattice distribution structure and are arranged relative to the axial full length of the shell and the radial directions of 1/4-1/2 arc lengths.
9. The guy cable magnetic flux leakage nondestructive testing device based on the light source signal is characterized in that a light source receiver of a single point is composed of a magnetic liquid film (3-51), a cavity (3-52) and a spectrometer probe (3-53), wherein the magnetic liquid film faces to a light source emitter, and the spectrometer probe is positioned in the cavity and below the magnetic liquid film and faces to a magnetic conduction layer; the thickness of the magnetic liquid film is 18-22 microns, one or more of ferroferric oxide, ferric oxide, Co or Ni is selected as magnetic particles, and water is used as base liquid.
10. A guy cable magnetic flux leakage nondestructive testing method based on a light source signal, which is characterized in that the testing device of any one of claims 1 to 9 is adopted, and the method comprises the following steps:
1) the detection device is sleeved on a to-be-detected inhaul cable and then is brought to an appointed position by a cable climbing robot;
2) starting a light source emitter, collecting the wavelength N1 where the first group of counts peak values are located by a spectrometer probe, outputting the wavelength N1 to be recorded at a PC (personal computer) end, and solving the light transmittance T1 at the peak values;
3) starting an excitation device, enabling the stay cable to be detected to reach a magnetic saturation state, then collecting the wavelength N2 where the second group of counts peak values are located again by the probe of the spectrograph, outputting the wavelength N2 to be recorded at the PC end, and obtaining the light transmittance T2 at the peak values;
4) comparing the two groups of wavelengths and the light transmittance, and finding out a position with larger difference in the dot matrix, namely the defect position of the detection area;
5) after the first rectangular area signal is collected, the excitation device is closed, the magnetic conduction connecting block with the roller is driven by the motor to rotate circumferentially, and the power supply of the excitation device is turned on after the signal reaches the next detection area, so that the annular area can be detected;
6) above-mentioned flow is so repeated, accomplishes to examining after examining the cable top and detects.
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