CN102053046A - System and method for detecting hydrophilic angle on surface of composite insulator - Google Patents
System and method for detecting hydrophilic angle on surface of composite insulator Download PDFInfo
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Abstract
The invention relates to the technical field of performance detection of insulators, in particular to system and method for detecting a hydrophilic angle on the surface of a composite insulator. The system comprises a mechanical transmission mechanism, a quantified dropping mechanism, a CCD (Charged Coupled Device) horizontal shooting mechanism and a detection module, wherein the mechanical transmission mechanism is used for controlling the transmission of a screw rod of a main worktable and the lifting of a water outlet dropper and a CCD rack; the quantified dropping mechanism is used for accurately controlling the water injection rate on the surface of the insulator in each detection; the CCD horizontal shooting mechanism is used for obtaining the image of water drops on the surface of the insulator; and the detection module is used for carrying out assistant processing on the image of water drops and finally obtaining the hydrophilic angle. In the method of the invention, the image is preprocessed by using gray stretching, filtration and other algorithms; the division of the image is realized by using the algorithms such as edge detection and the like; outline discrete points are fitted by using polynomial fitting; and a contact angle is obtained by carrying out derivation on the fitted polynomial. By means of the invention, the principle error of the device is reduced to a great extent; the detection accuracy is higher; the result is objective; and the whole device has simple design and low manufacturing cost and can be applied to the detection operation in site environment.
Description
Technical field
The present invention relates to insulator performance calibrating technical field, relate in particular to a kind of composite insulator surface hydrophilic angle verification system and method.
Background technology
The calibrating of insulator performance occupies critical role in Maintenance of Electric Transmission Line.At present, silicon rubber synthetic insulators relies on its excellent resistant to dodge performance, has obtained application more and more widely in electric system.But because of drench with rain at material aging, sunshine, acid rain corrodes and other industrial pollution factors, and insulator surface and material internal structure are changed.For this reason, be necessary to find a kind of effective ways that can differentiate composite insulator insulating property quality fast.Discover that the dirty performance of the moisture-proof of silicon rubber synthetic insulators excellence comes from the hydrophobic nature of silicon rubber low-energy surface, promptly the composite insulation sub-surface is the detest state to water, and this is a kind of physical property of low-energy solid material surface.In general, hydrophobic nature is good more, and the performance of insulating material is good more (referring to document 1) just.
At present, the method for measurement insulating material surface hydrophobicity mainly contains surface tension method, water spray stage method and contacts horn cupping.In view of still there not being at present the method for directly accurately measuring solid surface tension, existing method then mainly is to pay close attention to gather state or the infiltration behavior of the liquid of different surfaces tension force at insulator surface, and consider that employed partially liq in the surface tension method (as formamide etc.) also has certain invasive to human body, this method still needs further improvement.The water spray stage method is mainly paid close attention to the distribution situation of large quantity of moisture at insulator surface, judges hydrophobic nature according to " HC grade " again; This method is simple to operate, and is low to testing equipment and environment requirement, but has bigger subjectivity, and the result that range estimation is identified tends to occur than mistake, even directly influences verification result.The contact horn cupping reflects the hydrophobic nature of composite insulation sub-surface by the contact angle (also crying hydrophilic angle) of measuring the globule and material surface.This precision of method is higher, it is a kind of more satisfactory calibration method, but need in the laboratory, be realized by methods such as static contact angle surveying instrument, measuring microscopes, still be difficult to make miniature instrument at present and be used for on-the-spot the detection, be unfavorable for improving the work efficiency (referring to document 2,3) of electric system.
Document 1: material water wettability standard picture Denoising Study [J]. Jiang Wen, Wang Xianpei, Wang Quande etc. High-Voltage Technology, 2006, Vol 23 No.5.
Document 2: the development of the charged detection technique of composite insulator hydrophobic nature and application [J]. Zhao Linjie, Wang Haorui etc. south electric network technical research, 2007, Vol.3 No.2.
Document 3: the Flame Image Process of composite insulator contact angle detects [J]. Tao Weiliang, Wang Xianpei etc. and Electric Machines and Control, 2009, Vol 13 No.2.
Summary of the invention
At the technical matters of above-mentioned existence, the purpose of this invention is to provide a kind of composite insulator surface hydrophilic angle verification system and method, to realize the on-the-spot rapid automatized detection of composite insulator surface hydrophobicity energy in the transmission line of electricity.
For achieving the above object, the present invention adopts following technical scheme:
A kind of composite insulator surface hydrophilic angle verification system:
Mechanical transmission mechanism is used to control transmission of main worktable screw mandrel and water outlet dropper, the lifting of CCD frame; Described mechanical transmission mechanism comprises the annular base that total system can be fixed on the insulator, four pillars that stand on the base, and rail plate, main engine bed, main screw mandrel, main knob and the main worktable of the instrument that rises of shore supports, main engine bed links to each other by 4 pillars with base, base designs is an annular, be provided with 2 rail plates and screw mandrel kinematic train above the main engine bed, rail plate is used to carry main worktable; The screw mandrel kinematic train comprises main knob, main screw mandrel, links to each other with main engine bed with main worktable;
The mechanism of quantitatively dripping is used for the each insulator surface water injection rate that detects of accurately control; The described mechanism of quantitatively dripping comprises measuring pipet frame, measuring pipet, proofed sleeve, glass bead and water outlet dropper, and the measuring pipet frame is threadedly secured on the main worktable, and the water outlet dropper links to each other by proofed sleeve with measuring pipet, has glass bead in the proofed sleeve;
The horizontal photographic unit of CCD is used to obtain required insulator surface water droplet image; The horizontal photographic unit of described CCD comprises CCD frame and miniature CCD camera; CCD frame (8) is arranged to rectangle, and the side has scale, with the following pan position of mark miniature CCD camera;
Assay module is used for the water droplet image is carried out auxiliary process, and finally obtains hydrophilic angle, and described assay module comprises following submodule:
Figure pre-service submodule is used for coloured image is changed into 256 color shade images, and adopts the method for piecewise linear transform that each pixel grey scale of image is done linear stretch, realizes effective enhancing of water droplet image;
How much rotational transform submodules are used for the gray level image of water droplet is carried out the geometry rotational transform, the water droplet image is gone to horizontal level show;
The image smoothing submodule adopts spatial domain method to improve picture quality, and each pixel in the water droplet image is carried out smooth operation;
The image segmentation submodule is used the Roberts edge detection operator the level and smooth result of gained is carried out image segmentation, makes that the profile of water droplet image is more outstanding;
The binary conversion treatment submodule is used to use the threshold value method image is carried out binary conversion treatment, chooses the Ostu thresholding algorithm and determines optimum threshold value;
The water droplet profile extracts submodule, if the gray-scale value g of 8 neighborhood territory pixel points of certain pixel
f(i
k, j
k) (k=1 ..., 8) and the gray-scale value f of central pixel point (i, j) all identical, think that then this point is in the inside of image and is deleted, otherwise think that this point is in edge of image;
Edge contour match submodule selects for use the way of fitting method that water droplet edge of image contour curve is carried out match.
Main worktable in the described mechanical transmission mechanism is provided with two jacks, settles water outlet dropper and CCD frame respectively.
Be furnished with O-ring seal between the front end of main screw mandrel and bearing cap, be furnished with the pad of adjustment between main engine bed and bearing cap and also can fix by trip bolt, the front end ball bearing then can be fixed by the shaft shoulder of bearing cap and main screw mandrel;
The rear end of main screw mandrel is furnished with sleeve, is furnished with the pad of adjustment between main engine bed and end cap and also can fixes by trip bolt, and the rear end ball bearing then can be fixed by sleeve and end cap.
Have scale above the measuring pipet in the described mechanism of quantitatively dripping, be used for the water consumption that mark drips at every turn, and throughput liquid pipe support supports, to keep its plumbness.
Water outlet dropper in the described mechanism of quantitatively dripping can be regulated lifting by little knob and minor leading screw, and the side has scale, can mark the following pan position of water droplet pipe; The diameter of glass bead is larger than the diameter of water outlet dropper.
Described composite insulator surface hydrophilic angle verification system also comprises the horizontal alignment device, is positioned on the main engine bed, and liquid and bubble are contained in inside, when the bubble in 2 horizontal alignment devices all is positioned at the middle groove position of calibrating device, shows that system is positioned at horizontal level.
Edge contour match submodule in the described assay module, to the function expression differentiate of curve fitting gained, the derivative value of arbitrfary point can characterize curve at this tangent slope k, then the angle of this some place's tangent line and horizontal axis:
Obtain curve respectively at the tangent line at left and right sides end points place and the angle of horizontal axis by following formula, be the receding angle θ that the globule and insulator form
rWith advancing angle θ
a
A kind of composite insulator surface hydrophilic angle calibration method comprises:
1. coloured image is changed into 256 color shade images, and adopt the method for piecewise linear transform that each pixel grey scale of image is done linear stretch, realize effective enhancing of water droplet image;
2. the gray level image to water droplet carries out the geometry rotational transform, the water droplet image is gone to horizontal level show;
3. adopt spatial domain method to improve picture quality, each pixel in the water droplet image is carried out smooth operation;
4. use the Roberts edge detection operator the level and smooth result of gained is carried out image segmentation, make that the profile of water droplet image is more outstanding;
5. use the threshold value method image is carried out binary conversion treatment, choose the Ostu thresholding algorithm and determine optimum threshold value;
If the 6. gray-scale value g of 8 neighborhood territory pixel points of certain pixel
f(i
k, j
k) (k=1 ..., 8) and the gray-scale value f of central pixel point (i, j) all identical, just think that this point is in the inside of image and is deleted, otherwise think that promptly this point is in edge of image;
7. select for use the way of fitting method that water droplet edge of image contour curve is carried out match, function expression differentiate to the curve fitting gained, the derivative value of arbitrfary point can characterize curve at this tangent slope k, then the angle of this some place's tangent line and horizontal axis:
Obtain curve respectively at the tangent line at left and right sides end points place and the angle of horizontal axis by following formula, be the receding angle θ that the globule and insulator form
rWith advancing angle θ
a
The present invention has the following advantages and good effect:
1) the present invention is in each testing process, and the principle of work of the mechanism of dripping has guaranteed that the amount of dripping can accurately be limited in the scope of regulation, can be by the accurate number of degrees of measuring pipet are realized quantitatively dripping;
2) primary optical axis of miniature CCD camera was contour with the water delivering orifice of water outlet dropper all the time during the structural design of the horizontal photographic unit of CCD of the present invention had guaranteed to take, and tangent with the insulator surface level;
3) the present invention can reduce the errors of principles of device to a great extent, and accuracy of detection is higher relatively, and the result is objective, whole device simplicity of design, and manufacturing cost is not high, can be applicable under the site environment in the detecting operation.
Description of drawings
Fig. 1 is the assembling synoptic diagram of dynamo-electric hardware fuselage in the verification system of composite insulator surface hydrophilic provided by the invention angle.
Fig. 2 is a mechanical transmission mechanism vertical view in the verification system of composite insulator surface hydrophilic provided by the invention angle.
Fig. 3 is the A-A cut-open view of Fig. 2.
Fig. 4 is the B-B cut-open view of Fig. 2.
Fig. 5 is the longitudinal profile structural map of water outlet dropper among Fig. 1.
Fig. 6 is a CCD driving circuit section schematic diagram among Fig. 1.
Fig. 7 is the FB(flow block) of calibrating software program provided by the invention.
1-liquid pipe support, 2-measuring pipet, 3-proofed sleeve, 4-glass bead, 5-water outlet dropper, 6-master's worktable, 7-main knob, 8-CCD frame, 9-miniature CCD camera, 10-horizontal alignment device, 11-minor leading screw, the little knob of 12-, 13-master's screw mandrel, 14-main engine bed, 15-pillar, 16-base, the 17-rail plate, the 18-trip bolt, 19-adjusts pad, 20-bearing cap, the 21-O-ring seal, 22-ball bearing, 23-end cap, 24-sleeve.
Embodiment
The technical scheme that the present invention proposes is based on CCD (Charge-coupled Device, the novel hydrophilic angle verification system and the method for insulator surface charge-coupled image sensor), on contact horn cupping basis, introduce CCD technology and digital image processing techniques, the on-the-spot robotization that has realized the hydrophilic angle of composite insulator detects, and calibration operation is carried out easily.
System provided by the invention is a core with CCD, finishes insulator quantitatively dripping in detecting, the tangent shooting work of level, reduces the errors of principles that causes because of the amount of dripping or shooting angle difference; And can in PC, carry out Flame Image Process to the globule picture that obtains, calculate the hydrophilic angular data of insulator surface.The design of this system is made up of dynamo-electric hardware fuselage and calibrating software program, dynamo-electric hardware fuselage comprises: the mechanical transmission mechanism that is used to control transmission of main worktable screw mandrel and water outlet dropper, the lifting of CCD frame, be used for the each mechanism of quantitatively dripping of detecting the insulator surface water injection rate of accurately control, be used to obtain the horizontal photographic unit of CCD of required insulator surface water droplet image.Assay module partly is mainly used in carries out auxiliary process to the water droplet image, and finally obtains hydrophilic angle.
Mechanical transmission mechanism comprises the annular base that total system can be fixed on the insulator, four pillars that stand on the base, and rail plate, main engine bed, main screw mandrel and the main worktable of the instrument that rises of shore supports.Main engine bed is approximate frame type structure, it avris and frame in be fixed with two rail plates that are parallel to each other respectively; Main screw mandrel also is fixed in the frame of main engine bed, and the axis direction of screw mandrel is parallel to the glide direction of two guide rails equally; By regulating the main knob of main screw mandrel one side, can control main worktable it is moved stably along the rail plate direction.Water outlet dropper, CCD frame pass through mutually with main worktable, by regulating the little knob on the main worktable, can realize the lifting and the locking of water outlet dropper and CCD frame.
The basic functional principle and the base buret of mechanism of quantitatively dripping is similar, comprise by screw thread and be fixed in measuring pipet frame on the main worktable, measuring pipet by the clamping of measuring pipet frame, be enclosed within the proofed sleeve on measuring pipet bottom and water outlet dropper top, and can free vertical lifting, regulate the water outlet dropper of locking by the little knob on the main worktable.The water outlet dropper outside indicates scale, the decline length of expression dropper.In addition, a glass ball is equipped with in the inner middle section approximately of proofed sleeve, and the slightly larger in diameter of glass bead plays further to limit injection flow in proofed sleeve.
The horizontal photographic unit of CCD is made up of CCD frame and miniature CCD camera.The CCD frame can be on main worktable vertical lifting, can realize being locked by regulating little knob; The miniature CCD camera is fixed in CCD frame bottom, guarantees that its optical axis strictness is perpendicular to the CCD frame.The CCD frame outside indicates scale, the dropping distance of expression miniature CCD camera optical axis.
Assay module certain applications digital image processing techniques are further handled obtaining image, adopt grey level stretching, filtering scheduling algorithm to carry out pretreatment image, adopt the rim detection scheduling algorithm to realize image segmentation, adopt fitting of a polynomial that the profile discrete point is carried out match, and differentiate obtain contact angle to polynomial fitting.Automatically realize composite insulator surface hydrophilic angle with detection by quantitative, reach quick judgement insulator hydrophobicity can purpose.
The invention will be further described in conjunction with the accompanying drawings with specific embodiment below:
Technical scheme of the present invention is made up of dynamo-electric hardware fuselage and calibrating software program, dynamo-electric hardware fuselage comprises: the mechanical transmission mechanism that is used to control transmission of main worktable screw mandrel and water outlet dropper, the lifting of CCD frame, be used for the each mechanism of quantitatively dripping of detecting the insulator surface water injection rate of accurately control, be used to obtain the horizontal photographic unit of CCD of required insulator surface water droplet image.The calibrating software program is mainly used in the water droplet image is carried out auxiliary process, and finally obtains hydrophilic angle.The structure assembly relation of dynamo-electric hardware fuselage of the present invention can be referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, and the basic procedure of calibrating software program can be referring to Fig. 7.
Mechanical transmission mechanism comprises the annular base (16) that total system can be fixed on the insulator, four pillars (15) that stand on the base, and rail plate (17), main engine bed (14), main screw mandrel (13), main knob (7) and the main worktable (6) of the instrument that rises of shore supports.As Fig. 1, Fig. 2, shown in Figure 4, main engine bed (14) links to each other by 4 pillars (15) with base (16), and base (16) is designed to annular and is convenient to system and puts.Be provided with 2 rail plates (17) and screw mandrel kinematic train above the main engine bed (14).Rail plate (17) is used to carry main worktable (6); The screw mandrel kinematic train comprises main knob (7), main screw mandrel (13), links to each other with main engine bed (14) with main worktable (6); As shown in Figure 3, main worktable (6) is provided with two jacks, settles water outlet dropper (5) and CCD frame (8) respectively.
Mechanical transmission mechanism as shown in Figure 4 fastening, is furnished with O-ring seal (21) between the front end of main screw mandrel (13) and bearing cap (20), be furnished with adjustment pad (19) between main engine bed (14) and bearing cap (20) and can pass through trip bolt (18) and fix, front end ball bearing (22) then can be fixed by the shaft shoulder of bearing cap (20) and main screw mandrel (13).The rear end of main screw mandrel (13) is furnished with sleeve (24), is furnished with adjustment pad (19) between main engine bed (14) and end cap (23) and can pass through trip bolt (18) fixing, and rear end ball bearing (22) then can pass through sleeve (24) and end cap (23) to be fixed.
The mechanism of quantitatively dripping comprises measuring pipet frame (1), measuring pipet (2), proofed sleeve (3), glass bead (4) and water outlet dropper (5).Measuring pipet has scale above (2), is used for the water consumption that mark drips at every turn, and throughput liquid pipe support (1) supports, to keep its plumbness.Measuring pipet frame (1) is threadedly secured on the main worktable (6).Be the profile of water outlet dropper (5) among Fig. 5, water outlet dropper (5) can be regulated lifting by little knob (12) and minor leading screw (11), and the side has scale, can mark the following pan position of water droplet pipe (5).Water outlet dropper (5) links to each other by proofed sleeve (3) with measuring pipet (2), has glass bead (4) in the proofed sleeve (3), and the diameter of glass bead (4) is larger than the diameter of water outlet dropper (5).
The horizontal photographic unit of CCD comprises CCD frame (8) and miniature CCD camera (9).CCD frame (8) is arranged to rectangle, and the side has scale, following pan position that can mark miniature CCD camera (9).
Horizontal alignment device (10) is positioned on the main engine bed (14), and liquid and bubble are contained in inside, when the bubble in 2 horizontal alignment devices all is positioned at the middle groove position of calibrating device, shows that system is positioned at horizontal level.
The course of work of the present invention is as follows: at first, be placed on system on the insulator surface and adjust its riding position, the bubble in 2 horizontal alignment devices (10) is positioned at the middle groove position of calibrating device, shows that system is positioned at horizontal level.Then, regulate main knob (7), main worktable (6) is moved to ideal position by the screw mandrel transmission; Adjust the little knob (12) that water droplet pipe (5) is located, use water droplet pipe (5) and be displaced downwardly to the connect insulator surface, and note and move displacement Δ X; Adjust water droplet pipe (5) again and upwards move a bit of distance, applying light is positioned at the proofed sleeve (3) of glass bead (4) top, water is dripped to insulator surface via water outlet dropper (5), and write down the decline of water table amount of measuring pipet (2), in order to demarcate the drop size of each measurement.Then, regulate little knob (12) and use to retract on the water droplet pipe (5) and be grouped into the most original position, abdicate the visual field so that later stage miniature CCD camera (9) is taken.Afterwards, regulate the little knob (12) that CCD frame (8) is located, take pictures after making miniature CCD camera (9) move down displacement X, just guaranteed that thus the water delivering orifice of the primary optical axis of miniature CCD camera (9) and water outlet dropper (5) is contour, promptly the optical axis of CCD and insulator surface level are tangent.At last, the water droplet picture that miniature CCD camera (9) is taken reaches PC for the later stage routine processes.
The ultimate principle of CCD driving circuit section as shown in Figure 6, in the CCD driving circuit, complex programmable logic device (CPLD) realizes mainly that the CCD sequential drives, the CCD video processing circuit drives and three partial functions such as USB interface controlling and driving.After the CCD camera was started working, the simulating signal of acquisition became digital signal after video processing module is realized A/D conversion, black level correction and digital bias control, be sent to PC by USB interface behind the FIFO memorizer buffer, thereby obtains image.This process belongs to the hardware configuration process of the driving CCD of USB of our design, and the specific implementation circuit is not introduced in detail.
The flow process of calibrating software program as shown in Figure 7.When the water droplet image that photographs carries out the figure pre-service, at first coloured image is changed into 256 color shade images, and adopt the method for piecewise linear transform that each pixel grey scale of image is done linear stretch, realize effective enhancing of water droplet image.Secondly, the gray level image of water droplet is carried out geometry rotational transform, the water droplet image is gone to the horizontal level demonstration.The 3rd, adopt spatial domain method to improve picture quality, we have designed a kind of 3 * 3 cross median filters each pixel in the water droplet image have been carried out smooth operation, both can effectively remove salt-pepper noise and impulsive noise, and it is fuzzy because of what smoothly cause to reduce image boundary again.The 4th, use the Roberts edge detection operator the level and smooth result of gained is carried out image segmentation, make that the profile of water droplet image is more outstanding.The 5th, use the threshold value method again image is carried out binary conversion treatment, choose the Ostu thresholding algorithm and determine optimum threshold value.The 6th, design a kind of eight neighborhood borders and followed the tracks of the water droplet profile that extracts after handling, its concretism is: if the gray-scale value g of 8 neighborhood territory pixel points of certain pixel
f(i
k, j
k) (k=1 ..., 8) and the gray-scale value f of central pixel point (i, j) all identical, just think that this point is in the inside of image and is deleted, otherwise think that promptly this point is in edge of image.
At last, select for use the way of fitting method that water droplet edge of image contour curve is carried out match.Through experiment, finds four times or five way of fitting results ideal comparatively that the data of acquisition are also more stable.To the function expression differentiate of curve fitting gained, the derivative value of arbitrfary point can characterize curve at this tangent slope k again, then the angle of this some place's tangent line and horizontal axis:
Obtain curve respectively at the tangent line at left and right sides end points place and the angle of horizontal axis by following formula, be the receding angle θ that the globule and insulator form
rWith advancing angle θ
a
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique; under the situation that does not break away from the spirit and scope of the present invention; can also make various conversion or modification, so all technical schemes that are equal to, all fall into protection scope of the present invention.
Claims (8)
1. a composite insulator surface hydrophilic angle verification system is characterized in that, comprising:
Mechanical transmission mechanism is used to control transmission of main worktable screw mandrel and water outlet dropper, the lifting of CCD frame; Described mechanical transmission mechanism comprises the annular base that total system can be fixed on the insulator, four pillars that stand on the base, and rail plate, main engine bed, main screw mandrel, main knob and the main worktable of the instrument that rises of shore supports, main engine bed links to each other by 4 pillars with base, base designs is an annular, be provided with 2 rail plates and screw mandrel kinematic train above the main engine bed, rail plate is used to carry main worktable; The screw mandrel kinematic train comprises main knob, main screw mandrel, links to each other with main engine bed with main worktable;
The mechanism of quantitatively dripping is used for the each insulator surface water injection rate that detects of accurately control; The described mechanism of quantitatively dripping comprises measuring pipet frame, measuring pipet, proofed sleeve, glass bead and water outlet dropper, and the measuring pipet frame is threadedly secured on the main worktable, and the water outlet dropper links to each other by proofed sleeve with measuring pipet, has glass bead in the proofed sleeve;
The horizontal photographic unit of CCD is used to obtain required insulator surface water droplet image; The horizontal photographic unit of described CCD comprises CCD frame and miniature CCD camera; CCD frame (8) is arranged to rectangle, and the side has scale, with the following pan position of mark miniature CCD camera;
Assay module is used for the water droplet image is carried out auxiliary process, and finally obtains hydrophilic angle, and described assay module comprises following submodule:
Figure pre-service submodule is used for coloured image is changed into 256 color shade images, and adopts the method for piecewise linear transform that each pixel grey scale of image is done linear stretch, realizes effective enhancing of water droplet image;
How much rotational transform submodules are used for the gray level image of water droplet is carried out the geometry rotational transform, the water droplet image is gone to horizontal level show;
The image smoothing submodule adopts spatial domain method to improve picture quality, and each pixel in the water droplet image is carried out smooth operation;
The image segmentation submodule is used the Roberts edge detection operator the level and smooth result of gained is carried out image segmentation, makes that the profile of water droplet image is more outstanding;
The binary conversion treatment submodule is used to use the threshold value method image is carried out binary conversion treatment, chooses the Ostu thresholding algorithm and determines optimum threshold value;
The water droplet profile extracts submodule, if the gray-scale value g of 8 neighborhood territory pixel points of certain pixel
f(i
k, j
k) (k=1 ..., 8) and the gray-scale value f of central pixel point (i, j) all identical, think that then this point is in the inside of image and is deleted, otherwise think that this point is in edge of image;
Edge contour match submodule selects for use the way of fitting method that water droplet edge of image contour curve is carried out match.
2. composite insulator surface hydrophilic according to claim 1 angle verification system is characterized in that:
Main worktable in the described mechanical transmission mechanism is provided with two jacks, settles water outlet dropper and CCD frame respectively.
3. composite insulator surface hydrophilic according to claim 1 and 2 angle verification system is characterized in that:
Be furnished with O-ring seal between the front end of main screw mandrel and bearing cap, be furnished with the pad of adjustment between main engine bed and bearing cap and also can fix by trip bolt, the front end ball bearing then can be fixed by the shaft shoulder of bearing cap and main screw mandrel;
The rear end of main screw mandrel is furnished with sleeve, is furnished with the pad of adjustment between main engine bed and end cap and also can fixes by trip bolt, and the rear end ball bearing then can be fixed by sleeve and end cap.
4. according to each described composite insulator surface hydrophilic angle verification system of claim 1-3, it is characterized in that:
Have scale above the measuring pipet in the described mechanism of quantitatively dripping, be used for the water consumption that mark drips at every turn, and throughput liquid pipe support supports, to keep its plumbness.
5. according to each described composite insulator surface hydrophilic angle verification system of claim 1-4, it is characterized in that:
Water outlet dropper in the described mechanism of quantitatively dripping can be regulated lifting by little knob and minor leading screw, and the side has scale, can mark the following pan position of water droplet pipe; The diameter of glass bead is larger than the diameter of water outlet dropper.
6. according to each described composite insulator surface hydrophilic angle verification system of claim 1-5, it is characterized in that:
Described composite insulator surface hydrophilic angle verification system also comprises the horizontal alignment device, is positioned on the main engine bed, and liquid and bubble are contained in inside, when the bubble in 2 horizontal alignment devices all is positioned at the middle groove position of calibrating device, shows that system is positioned at horizontal level.
7. according to each described composite insulator surface hydrophilic angle verification system of claim 1-6, it is characterized in that:
Edge contour match submodule in the described assay module, to the function expression differentiate of curve fitting gained, the derivative value of arbitrfary point can characterize curve at this tangent slope k, then the angle of this some place's tangent line and horizontal axis:
Obtain curve respectively at the tangent line at left and right sides end points place and the angle of horizontal axis by following formula, be the receding angle θ that the globule and insulator form
rWith advancing angle θ
a
8. a composite insulator surface hydrophilic angle calibration method is characterized in that, may further comprise the steps:
1. coloured image is changed into 256 color shade images, and adopt the method for piecewise linear transform that each pixel grey scale of image is done linear stretch, realize effective enhancing of water droplet image;
2. the gray level image to water droplet carries out the geometry rotational transform, the water droplet image is gone to horizontal level show;
3. adopt spatial domain method to improve picture quality, each pixel in the water droplet image is carried out smooth operation;
4. use the Roberts edge detection operator the level and smooth result of gained is carried out image segmentation, make that the profile of water droplet image is more outstanding;
5. use the threshold value method image is carried out binary conversion treatment, choose the Ostu thresholding algorithm and determine optimum threshold value;
If the 6. gray-scale value g of 8 neighborhood territory pixel points of certain pixel
f(i
k, j
k) (k=1 ..., 8) and the gray-scale value f of central pixel point (i, j) all identical, just think that this point is in the inside of image and is deleted, otherwise think that promptly this point is in edge of image;
7. select for use the way of fitting method that water droplet edge of image contour curve is carried out match, function expression differentiate to the curve fitting gained, the derivative value of arbitrfary point can characterize curve at this tangent slope k, then the angle of this some place's tangent line and horizontal axis:
Obtain curve respectively at the tangent line at left and right sides end points place and the angle of horizontal axis by following formula, be the receding angle θ that the globule and insulator form
rWith advancing angle θ
a
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN102680363A (en) * | 2012-05-10 | 2012-09-19 | 天津大学 | Composite insulator hydrophobicity evaluating device and method based on dynamic drip ultrasound characteristic |
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| CN104201586A (en) * | 2014-08-26 | 2014-12-10 | 国家电网公司 | Rapid recovery method of composite outer insulation running performance of electric transmission and transformation equipment in hazy weather |
| CN105486610A (en) * | 2015-11-22 | 2016-04-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Preparation of hydrophobic coating and evaluation method for hydrophobicity |
| CN106296773A (en) * | 2016-08-12 | 2017-01-04 | 中国科学院计算技术研究所 | A kind of method and apparatus generating multi-level vectogram |
| CN110132835A (en) * | 2019-05-30 | 2019-08-16 | 西南交通大学 | A kind of composite insulating material insulation degradation assessment system and experimental method |
| CN110687018A (en) * | 2019-09-24 | 2020-01-14 | 武汉大学 | 3D contact angle measuring device and measuring method |
| CN111376107A (en) * | 2020-04-27 | 2020-07-07 | 马鞍山斯博尔机械技术服务有限公司 | Full-automatic detection equipment for working table plate of numerical control machine tool |
| CN113487541A (en) * | 2021-06-15 | 2021-10-08 | 三峡大学 | Insulator detection method and device |
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| US20130300859A1 (en) * | 2011-09-16 | 2013-11-14 | Jiang Qian | All-purpose portable tester for isolation character of the surface of the composite bushing made from silicon rubber |
| CN102519846A (en) * | 2011-12-15 | 2012-06-27 | 国网电力科学研究院 | Hyperspectrum-based composite insulator hydrophobicity detection method |
| CN102519846B (en) * | 2011-12-15 | 2013-11-06 | 国网电力科学研究院 | Hyperspectrum-based composite insulator hydrophobicity detection method |
| CN102680363A (en) * | 2012-05-10 | 2012-09-19 | 天津大学 | Composite insulator hydrophobicity evaluating device and method based on dynamic drip ultrasound characteristic |
| CN102980535A (en) * | 2012-12-12 | 2013-03-20 | 华为终端有限公司 | Angle measurement method and device |
| CN102980535B (en) * | 2012-12-12 | 2015-07-29 | 华为终端有限公司 | Angle measurement method and device |
| CN104201586A (en) * | 2014-08-26 | 2014-12-10 | 国家电网公司 | Rapid recovery method of composite outer insulation running performance of electric transmission and transformation equipment in hazy weather |
| CN104201586B (en) * | 2014-08-26 | 2016-02-10 | 国家电网公司 | Power transmission and transforming equipment composite outer insulation runnability quick recovery method under haze weather |
| CN105486610A (en) * | 2015-11-22 | 2016-04-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Preparation of hydrophobic coating and evaluation method for hydrophobicity |
| CN105486610B (en) * | 2015-11-22 | 2018-11-27 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of preparation and hydrophobicity performance evaluation method of hydrophobic coat |
| CN106296773A (en) * | 2016-08-12 | 2017-01-04 | 中国科学院计算技术研究所 | A kind of method and apparatus generating multi-level vectogram |
| CN106296773B (en) * | 2016-08-12 | 2019-11-29 | 中国科学院计算技术研究所 | A kind of method and apparatus generating multi-level polar plot |
| CN110132835A (en) * | 2019-05-30 | 2019-08-16 | 西南交通大学 | A kind of composite insulating material insulation degradation assessment system and experimental method |
| CN110687018A (en) * | 2019-09-24 | 2020-01-14 | 武汉大学 | 3D contact angle measuring device and measuring method |
| CN110687018B (en) * | 2019-09-24 | 2021-07-02 | 武汉大学 | 3D contact angle measuring device and measuring method |
| CN111376107A (en) * | 2020-04-27 | 2020-07-07 | 马鞍山斯博尔机械技术服务有限公司 | Full-automatic detection equipment for working table plate of numerical control machine tool |
| CN113487541A (en) * | 2021-06-15 | 2021-10-08 | 三峡大学 | Insulator detection method and device |
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