CN102818851B - Detection method for ultrasonic detection of arc-shaped corner of L-shaped workpeice - Google Patents
Detection method for ultrasonic detection of arc-shaped corner of L-shaped workpeice Download PDFInfo
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Abstract
A detection method for ultrasonic detection of the arc-shaped corner of an L-shaped workpeice comprises the following steps: 1, determining parameters of a phased array normal probe through the arc-shaped corner of the L-shaped workpeice; 2, determining a distance D between the surface center position of the phased array normal probe disposed vertical with the bisector of the open angle theta of the arc-shaped corner and the position of the center of a circle of the arc-shaped corner through the arc-shaped corner and the parameters of the phased array normal probe determined in step 1; 3, determining a wedge by determining the arc-shaped surface of the wedge through the arc-shaped corner of the detected L-shaped workpiece and by determining the flat surface of the wedge coupled with the phased array normal probe through the surface of the phased array normal probe having a determined position; and 4, emitting supersonic wave beans, receiving echo signals, and processing images. The detection method adopts the replacement of the wedge to substitute the replacement of the phased array normal probe to detect different detected L-shaped workpiece arc-shaped corner structures, and adopts the most common phased array normal probe to complete the detection, so the hardware cost is substantially saved.
Description
Technical field
The present invention relates to a kind of supersonic damage-free detection method, particularly relate to a kind of detection method of carrying out Ultrasonic Detection based on the arc bight of phased array ultrasonic detection technology to L shape workpiece.
Background technology
Non-Destructive Testing (nondestructive test) is called for short NDT, is do not destroy and damage examined object body, to its performance, quality, a kind of technology of detecting with or without inherent vice.In existing lossless detection method, conventional radiographic inspection (RT) method that mainly contains, Ultrasonic Detection (UT) method, infiltration detect (PT) method, Magnetic testing (MT) method, EDDY CURRENT (ET) method, certainly unconventional in addition, as microwave detection method, potentiometric detection method etc.
Ultrasonic Detection (UT) is when utilizing ultrasound wave to propagate in detected material, the acoustic characteristic of material and the change of interior tissue produce certain impact to hyperacoustic propagation, by the detection Knowing material performance of ultrasound wave degree of susceptibility and situation and structure change.When ultrasound wave enter object run into defect time, part sound wave will produce reflection, receiver is by analyzing reflection wave, measure the thickness of material, find the inherent vice hidden, or analyze the properties of materials etc. such as such as metal, plastics, compound substance, pottery, rubber and glass.
Specifically, phased array ultrasonic detection technology is each array element controlled by electronic system in transducer array, according to rule transmitting and receiving certain time delay ultrasound wave, thus Dynamic controlling ultrasonic beam deflection within the workpiece and focus on the Non-Destructive Testing realizing material.Echoed signal will be produced after the ultrasonic beam of synthesis runs into target, the time arriving each array element there are differences, the mistiming arriving each array element according to echo carries out compensation of delay to array element signals and is added synthesis, just the superposition of specific direction echoed signal can be strengthened, and the echoed signal in other directions weakens even counteracting thus obtains ultrasonic scanning figure.In order to the deflection and the focusing principle that make those skilled in the art more clearly understand ultrasonic beam, spy is illustrated with Figure 12 (a) and Figure 12 (b).Wherein, Figure 12 (a) is the schematic diagram of one dimensional linear array probe by the deflection of time delay control realization acoustic beam, wherein, driving pulse postpones the N number of array element encouraged respectively in transducer array element with the regular hour, its synthesis beam direction and horizontal direction are deflection angle θ, correspondingly, synthesis wave beam front and vertical direction angularly θ, namely form acoustic beam deflection; Figure 12 (b) is the schematic diagram that acoustic beam deflection adds focusing, and wherein, driving pulse postpones the N number of array element encouraged respectively in transducer array element with the regular hour, its composite wave front, and focuses on a P, namely forms sound beam focusing.
L shape workpiece is because of its complex structure, and conventional Ultrasound detection method is subject to the restriction of capacity of equipment and method, is difficult to realize accurate detection.At present to its Ultrasonic NDT, except adopting traditional Ultrasonic C-scanning System, start to adopt special shape phased array probe such as arcuate probe to carry out the Ultrasonic Detection to L shape structure, because the method must design arcuate probe and process, even if the sample slightly different to arc bight, also need the phased array arcuate probe adopting different size, therefore hardware cost is relatively high.
Summary of the invention
For this reason, the present invention, in order to solve the problems of the technologies described above, selects common phased array normal probe and the arc bight of specialized designs arc voussoir to L shape workpiece is detected, like this, because probe is selected from general part, the manufacture of voussoir relatively also than being easier to, therefore cost savings cost.Further, the present invention is directed to the L shape workpiece that arc radius is slightly different, without the need to changing phased array normal probe, the arc voussoir that only need design different size just can meet the good coupling with examined workpiece, greatly reduces hardware cost.
A kind ofly apply the detection method that Ultrasonic Detection is carried out in the arc bight of pick-up unit to L shape workpiece, wherein, described pick-up unit comprises phased array supersonic defectoscope, phased array normal probe and voussoir, described phased array supersonic defectoscope is electrically connected with described phased array normal probe, described phased array normal probe has multiple array element, its geometric parameter at least comprises element number of array and array element distance, and described voussoir has the curved surfaces be coupled with the arc bight of described detected L shape workpiece and the flat surface be coupled with described phased array normal probe; Wherein, described detection method comprises the steps:
A the geometric parameter determining step of () phased array normal probe, is determined the geometric parameter of described phased array normal probe by the arc bight of described L shape workpiece;
The position determining step of (b) phased array normal probe, that the parameter of the described phased array normal probe determined by arc bight and the step (a) of described L shape workpiece is determined to place along the bisector perpendicular to the open-angle θ in described arc bight, faced by distance D between the center on described phased array normal probe surface in described arc bight and the home position in described arc bight;
C the determining step of () voussoir, is determined the curved surfaces of described voussoir by the arc bight of described detected L shape workpiece, the flat surface of the described voussoir be coupled with it is determined on the surface of the described phased array normal probe determined by position;
(d) ultrasonic beam step of transmitting, first choose multiple described array element respectively and form multiple submatrix, carry out time delay between each described array element in each submatrix of described multiple submatrix again, the pulse signal that then described phased array supersonic defectoscope sends encourages each array element of each submatrix in described multiple submatrix to send ultrasound wave and then the ultrasonic beam of described each submatrix synthesis is impinged perpendicularly on the arc bight of described detected L shape workpiece;
(e) echo signal reception step, described ultrasonic beam forms echoed signal after running into the inherent vice of described detected L shape workpiece, and described echoed signal receives via each array element in described submatrix and forms A sweep signal;
F () image processing step, described A sweep signal is received by described phased array supersonic defectoscope, is converted into C scintigram through corresponding image processing program.
The invention has the beneficial effects as follows, the arc voussoir coordinated with it by selecting phased array normal probe bamboo product detects L shape workpiece arc bight, greatly reduces cost.Further, the structure slightly different to L shape workpiece arc bight, adopts and changes voussoir and replace changing phased array normal probe, and adopt prevailing phased array normal probe to complete detection, greatly saves hardware cost and design, test duration.
Accompanying drawing explanation
In order to explain the present invention, its illustrative embodiments will be described with reference to the drawings hereinafter, in accompanying drawing:
Fig. 1 shows the schematic diagram detecting the L shape workpiece that arc corner radius is 4mm with phased array normal probe;
Fig. 2 shows the schematic diagram being greater than the L shape workpiece of 90 degree with phased array normal probe detection open-angle;
Fig. 3 shows the schematic diagram being less than the L shape workpiece of 90 degree with phased array normal probe detection open-angle;
Fig. 4 illustrate in greater detail the phased array normal probe position in Fig. 1;
Fig. 5 schematically shows arc voussoir used in the present invention;
Fig. 6 shows the schematic diagram carrying out right margin detection with phased array normal probe;
Fig. 7 shows and carries out with phased array normal probe the schematic diagram that detects in gamut;
Fig. 8 shows the schematic diagram carrying out left margin detection with phased array normal probe;
Fig. 9 shows ultrasonic scanning image schematic diagram;
Figure 10 shows 3D matrix schematic diagram;
Figure 11 shows scan-data and fills schematic diagram;
Figure 12 (a) shows acoustic beam deflection delays time to control schematic diagram;
Figure 12 (b) shows acoustic beam deflection focusing delays time to control schematic diagram.
Embodiment
In the present invention, carrying out in Ultrasonic Detection to the arc bight of L shape workpiece, its pick-up unit comprises phased array supersonic defectoscope, phased array normal probe and voussoir.Wherein, phased array supersonic defectoscope is electrically connected with phased array normal probe, and phased array normal probe has multiple array element, and voussoir has the curved surfaces be coupled with the arc bight of L shape workpiece and the flat surface be coupled with phased array normal probe.
When defects detection being carried out to L shape workpiece with above-mentioned phased array normal probe, first encourage each array element (wafer) of phased array normal probe respectively with the electric pulse with the small time difference with phased array supersonic defectoscope, because array element is essentially the transducer of electroacoustic, acoustic-electric conversion, therefore each array element of phased array normal probe sends ultrasound wave, form the inside of ultrasonic composite wave beam to the arc bight of L shape workpiece, can return with flaw echo form after ultrasound wave runs into defect, and this flaw echo turns back to each array element with the computable time difference.Before signal converges, between the echoed signal that each array element receives, all there is the time difference.Signal converges the A sweep figure of rear formation, shows the echoing characteristics of a certain focus in material.
In the present invention, the acoustic beam control focusing principle in the arc bight of L shape workpiece is as follows, namely, by encouraging different phased array normal probe array element to different check point position, and the time delay controlling the excitation of each array element or received pulse is different, realizes phased array deflection and focus on equiphase controlling, make acoustic beam impinge perpendicularly on detected face as far as possible, and when laterally not moving phased array normal probe, realize all standing of acoustic beam to arc folding corner region.
The present invention adopts common phased array normal probe and custom-designed arc voussoir, for the radius in the different arc bights of L shape workpiece, meets the good coupling with examined workpiece, reduce hardware cost by the arc voussoir designing different size.About choosing of phased array normal probe and arc voussoir, main arc corner radius, arc bight opening angle, thickness 3 factors considering examined workpiece, can carry out in accordance with the following steps:
First, according to radius and the opening angle in the arc bight of L shape workpiece, the element number of array of selected phased array normal probe, array element distance and housing profile size is determined.The detection schematic diagram that Fig. 1 is arc corner radius is 4mm, open-angle is the L shape workpiece of 90 °, phased array normal probe is positioned over opening on the vertical plane of bisector of angle of arc bight.Arc bight surveyed area two-end-point is S1 and S2, and in order to ensure that acoustic beam impinges perpendicularly on S1 and the S2 point in detected face, acoustic beam yawing moment is the normal direction of S1 and S2 point, thus obtains the maximum deflection direction of acoustic beam.
For the L shape workpiece that open-angle is 90 °, first the array element distance p (array element distance p is in units of mm) of phased array normal probe to be selected is determined, in order to when acoustic beam wide-angle deflection, still can obtain good sound field characteristic, array element distance p usually gets and equals wavelength X, and retain a decimal, wherein, wavelength X equals the ratio (frequency of phased array probe is determined by the performance of actual measured workpiece) of the workpiece velocity of sound and the frequency of phased array normal probe, such as, the velocity of sound is the carbon fibre reinforced composite L shape workpiece of 2950m/s, when selecting phased array probe frequency to be 5MHz, its wavelength equals 0.59mm, then array element distance p gets 0.6mm, then, according to geometric relationship
determine the array number n in submatrix, determine the element number of array N of phased array normal probe to be selected according to the array number n of submatrix.In above-mentioned geometric relationship formula, n is the array number in phased array normal probe submatrix, and n can only choose 4,8,16..., namely the index of 2 is doubly; D is the distance of two ends array element from the shell rim of phased array normal probe, selects little profile to pop one's head in, therefore get d=3mm at this; R is the arc radius in the arc bight of L shape workpiece, is determined by the actual arc radius of L shape workpiece; θ is open-angle, and when the open-angle of L shape workpiece is equal to or greater than 90 °, θ equals 90 °, and when the open-angle of described L shape workpiece is less than 90 °, θ equals the open-angle of L shape workpiece.The maximal value that can meet the n in above-mentioned geometric relationship formula is the array number n in determined submatrix, and such as, be 4mm to arc radius r, open-angle is the L shape workpiece of 90 °, and when array element distance is defined as 0.6mm, n gets 8 can meet above-mentioned geometric relationship formula.The basis for selecting of the element number of array N of phased array normal probe and the array number n of submatrix is: the array number N of phased array normal probe is generally 16,32,64,128 etc., to having the phased array normal probe that array number N is 16, the array number n of selected submatrix is generally 4, it is the phased array normal probe of 32 to array number N, the array number n of selected submatrix is generally 8, the like.Therefore, when after the array number n determining submatrix, according to above-mentioned relation, the array number N of selected phased array normal probe instead can be released.According to above method, the L shape workpiece that the radius r for arc bight is 4mm, open-angle is 90 °, can select array number N to be 32, array element distance p to be the phased array normal probe of 0.6mm.
As shown in Figure 2, open-angle is greater than to the L shape workpiece of 90 °, because its arc surveyed area is less than the arc area that open-angle is the workpiece of 90 °, therefore open-angle still can be selected to be the phased array normal probe parameter of the L shape workpiece of 90 °.
As shown in Figure 3, open-angle is less than to the L shape workpiece of 90 °, the open-angle of above-mentioned proposition can be adopted to be that the choosing method of the L shape workpiece of 90 ° realizes choosing phased array normal probe geometric parameter.Because its arc surveyed area is greater than the arc surveyed area that open-angle is 90 °, employing this method can realize the detection to part arc area, the region namely in Fig. 3 between S 1 to S2.
Outer cover length L is the distance d that the product of array number N and array element distance p adds between two ends array element and shell rim.Outer casing width is the distance that array element width adds between array element and shell rim.
Secondly, the distance D between the home position determining the center on phased array normal probe surface and the surveyed area in arc bight.According to geometric relationship,
in formula, N is the array number of phased array normal probe, n is the array number of selected submatrix, p is array element distance.Concerning the L shape workpiece equaled and be less than 90 °, α is opening angle θ, in addition for the L shape workpiece being greater than 90 °, and α=180 °-θ.As shown in Figure 4, wherein according to the above-mentioned phased array normal probe parameter chosen, N=32, n=8, α=pi/2, p=0.6mm, namely D is 7.2mm.
Change the slightly different next L shape workpiece in arc bight into when detecting, when the arc bight radius R of next L shape workpiece, with the arc bight radius r of L shape workpiece selected when determining phased array normal probe geometric parameter, meet | during R-r|≤1, above-mentioned determined phased array normal probe still can be adopted to detect detected L shape workpiece, only need change the arc voussoir of different size.
Then, according to the described arc bight of detected L shape workpiece and the geometric parameter of determined phased array normal probe and placement location, the physical dimension of required voussoir is determined.Voussoir size mainly comprises bent angle radius r ', angle ω, curved surfaces be to the maximum height h of flat surface and voussoir thickness w.Composition graphs 4 and Fig. 5, arc voussoir bent angle radius r ', angle ω determines by the radius r in arc bight and open-angle θ being detected L shape workpiece, i.e. r '=r, ω=θ.Height h is bent angle radius r ' and distance sum between the center on phased array normal probe surface and voussoir bent angle home position, due to r '=r, therefore h=r+D.Voussoir thickness w is determined by phased array normal probe outer casing width.
By encouraging different array element to different check point position, the time delay controlling the excitation of each array element or received pulse is different, realizing phased array deflection and focus on equiphase controlling, when laterally not moving phased array normal probe, realizing the acoustic beam all standing to arc bight transverse area.
Below, the L shape workpiece being 4mm for the radius in arc bight, at this, selects the phased array normal probe of 32 array elements, and the method that its setup times postpones is as follows:
First choose 1st ~ 8 array elements, wherein, these 8 array elements synthesize a submatrix, can be referred to as the first submatrix.As shown in Figure 6, for the check point P making acoustic beam impinge perpendicularly on the arc folding corner region low order end of detected L shape workpiece, acoustic beam yawing moment is determined by the center O of check point position P and selected first submatrix effective aperture, thus can calculate angle of deflection.Then, according to determined acoustic beam angle of deflection, according to the acoustic beam deflection focusing delay control method shown in Figure 12 (b), driving pulse postpones 8 array elements encouraged respectively in transducer array element with the regular hour, its composite wave front focuses on a P, realizes the deflection focusing of acoustic beam in this angle of deflection.
Adopt phased array linear scanning mode, respectively to 2nd ~ 9,3 ~ 10,4 ~ 11...24 ~ 31, (center of each array element combination is followed successively by O to totally 23 submatrixs
1, O
2... O
23) encourage.Like this, first complete sending and receiving ultrasonic beam by the first submatrix, then complete transmitting-receiving by the second submatrix, so continue, each submatrix is received and dispatched successively in turn, until the 23rd submatrix completes transmitting-receiving, in the surveyed area namely to arc bight, different check point carries out scanning.As shown in Figure 7, divide 24 parts by the surveyed area in arc bight etc., then can obtain 23 check point K in surveyed area
1, K
2... K
23, cross the center (O of selected submatrix effective aperture respectively
1, O
2... O
23) and the check point (K in arc bight
1, K
2... K
23) draw straight line, then determine the scanning sound beam direction (totally 23) on surveyed area successively.Then according to the computing method of above-mentioned angle of deflection, by check point position K
nwith the center O of selected submatrix
ndetermine each acoustic beam deflection angle β
1, β
2, β
3... β
23.Finally according to determined acoustic beam deflection angle, according to above-mentioned acoustic beam deflection focusing delay control method, realize the deflection focusing of acoustic beam in each deflection angle, thus realize the detection to whole sensing range.
For the calculating of the deflection angle γ of the high order end check point of arc bight surveyed area, identical with arc folding corner region low order end check point, choose the 25th to the 32nd array element, these 8 array element synthesis effective apertures, acoustic beam yawing moment is determined in the center of check point position Q and this effective aperture, adopt the computing method of above-mentioned angle of deflection to calculate deflection angle γ again, as shown in Figure 8.According to determined acoustic beam deflection angle, according to above-mentioned acoustic beam deflection focusing delay control method, realize the deflection focusing of acoustic beam in this deflection angle.
Above-mentioned deflection focusing acoustic beam is used to carry out defect scanning to L shape workpiece, echoed signal is received by phased array system, obtain A sweep data, image processing program in defectoscope in phased array system adopts image procossing according to the arc corner shape of L shape workpiece thus obtains L shape workpiece C and scans stretch-out view, like this, just can reflect the inherent vice state of the corner of L shape workpiece exactly, and complete defect quantitative, detection and localization based on this.Particularly, as described below, Fig. 9 is B scanning imagery and the C scanning imagery schematic diagram of phased array supersonic scanning imagery, here, by the L shape workpiece being 4mm for arc corner radius, illustrate that the C how going out arc folding corner region according to the A sweep Plotting data gathered scans stretch-out view.
First, parameter is defined, particularly, acoustic beam number is 25, acoustic beam image data amount is 50, the velocity of sound of L shape workpiece is 2950m/s.
Then, 3D matrix is set up as shown in Figure 10.In this matrix, long is workpiece longitudinal length, and the width that length direction grid scans by phased array normal probe at every turn divides; Wide is the arc length in arc bight, namely high order end is left end check point position, and low order end is right-hand member check point position, and the grid of Width divides by the acoustic beam number synthesized by the surveyed area of arc bight, be respectively 1st ~ 8,2nd ~ 9,3rd ~ 10 ..., 25th ~ 32, totally 25 submatrixs; Height is the thickness of workpiece of L shape workpiece, and the grid of short transverse divides by the data volume of acoustic beam collection.In the present embodiment, the width of 3D matrix is 25, is highly 50, and the width that phased array normal probe scans at every turn is 6mm.
The A sweep data collected by each check point again, get maximum principle according to position summing point, are read in 3D matrix.Such as first group of acoustic beam is launched, then the A sweep echo data receiving acquisition puts into 3D matrix, as shown in figure 11, x direction is 1, y direction be 1 ~ 50 position filled by first group of A sweep data (50), the like, the A sweep data that 2nd ~ 25 acoustic beams obtain in the x-direction are stored into the position in the corresponding y direction of matrix respectively.Then phased array normal probe is along workpiece longitudinal direction and z to movement, repeats above-mentioned steps, completes the A sweep data stuffing of 3D matrix successively; Then according to the data message of 3D matrix, by 3D matrix along short transverse and z to getting maximal value, data projection to upper surface, obtain C and scan two-dimensional matrix, namely obtain the top view of detected surface of the work; Image completion is carried out to the data that C scans in two-dimensional matrix, more preferably, uses image denoising and image segmentation processing method to process C scan image simultaneously; Finally, relation draws out the C scan image of L shape workpiece arc bight surveyed area in proportion.
The invention has the beneficial effects as follows, to Different L shape workpiece arc corner structure, adopt replacing voussoir to replace changing phased array normal probe, and adopt prevailing phased array normal probe to complete detection, greatly save hardware cost; Adopt specific phase array focusing rule realize acoustic beam deflection and focus on, achieve the quick detection to L shape workpiece arc corner structure when mobile phased array normal probe less; Adopt C-scan stretch-out view to show whole arc bight surveyed area, make Flaw display mode more directly perceived, improve the ability differentiating defect, the Ultrasonic NDT of the method to carbon fiber enhancement resin base composite material L shape workpiece has important practical value.
The present invention is limited to the illustrative embodiments presented in the specification and illustrated in the drawings never in any form.All combinations of the embodiment (part) illustrated and describe are interpreted as clearly to be incorporated within this instructions and to be interpreted as clearly and fall within the scope of the present invention.And in the scope of the present invention that such as claims are summarized, a lot of distortion is possible.In addition, any reference marker in claims should be configured to limit the scope of the invention.
Claims (7)
1. apply the method that Ultrasonic Detection is carried out in the arc bight of phased array ultrasonic detection device to L shape workpiece for one kind, wherein, described phased array ultrasonic detection device comprises phased array supersonic defectoscope, phased array normal probe and voussoir, described phased array supersonic defectoscope is electrically connected with described phased array normal probe, described phased array normal probe has multiple array element, its geometric parameter at least comprises element number of array and array element distance, and described voussoir has the curved surfaces be coupled with the arc bight of described L shape workpiece and the flat surface be coupled with described phased array normal probe; Wherein, described detection method comprises the steps:
A the determining step of () phased array normal probe geometric parameter, is determined the geometric parameter of described phased array normal probe by the arc bight of described L shape workpiece;
The position determining step of (b) phased array normal probe, that the parameter of the described phased array normal probe determined by arc bight and the step (a) of described L shape workpiece is determined to place along the bisector perpendicular to the open-angle θ in described arc bight, faced by distance D between the center on described phased array normal probe surface in described arc bight and the home position in described arc bight;
C the determining step of () voussoir, is determined the curved surfaces of described voussoir by the arc bight of described L shape workpiece, the flat surface of the described voussoir be coupled with it is determined on the surface of the described phased array normal probe determined by position;
(d) ultrasonic beam step of transmitting, first choose multiple described array element respectively and form multiple submatrix, carry out time delay between each described array element in each submatrix of described multiple submatrix again, the pulse signal that then described phased array supersonic defectoscope sends encourages each array element of each submatrix in described multiple submatrix to send ultrasound wave and then the ultrasonic beam of described each submatrix synthesis is impinged perpendicularly on the arc bight of described L shape workpiece;
(e) echo signal reception step, described ultrasonic beam runs into described L shape workpiece and forms echoed signal, and described echoed signal receives via each array element in described submatrix and forms A sweep signal;
F () image processing step, described A sweep signal is received by described phased array supersonic defectoscope, is converted into C scintigram through corresponding image processing program.
2. method according to claim 1, wherein in step (a), first determines the array element distance p of described phased array normal probe according to p ≈ v/f, wherein, and the frequency that v represents the velocity of sound of described L shape workpiece, f represents described phased array normal probe; Again according to formula
determine the array number n of the submatrix of described phased array normal probe, wherein, d represents the distance of two ends array element from the shell rim of described phased array normal probe, r represents the arc radius of described L shape workpiece, when the open-angle of described L shape workpiece is equal to or greater than 90 °, θ equals 90 °, and when the open-angle of described L shape workpiece is less than 90 °, θ equals the open-angle of L shape workpiece; And then, the array number N of described phased array normal probe is determined according to the array number n of the submatrix of described phased array normal probe.
3. method according to claim 1 and 2, wherein, in step (b), the distance D between the center on the described described phased array normal probe surface in the face of described arc bight and the center of circle of described curved surfaces is by geometric relationship formula
determine, wherein, when the open-angle θ of described L shape workpiece is less than or equal to 90 °, α=θ, when the open-angle θ of described L shape workpiece is greater than 90 °, α=180 °-θ.
4. method according to claim 3, wherein in step (c), the arc length radius of the curved surfaces of described voussoir and central angle corresponding to described arc length is determined by the arc bight of described L shape workpiece, the maximum height h of described voussoir is calculated by formula h=r+D, wherein r represents the arc radius of described L shape workpiece, and the thickness of described voussoir is not less than the width of described phased array normal probe.
5. method according to claim 1, wherein said image processing step, comprise parameter definition sub-step, 3D matrix sets up sub-step, C scan image sets up sub-step, wherein, described parameter definition sub-step, defines the velocity of sound of the number of described ultrasonic beam, data volume that described ultrasonic beam gathers, the reference position of scanning and final position, described workpiece;
Described 3D matrix sets up sub-step, first, with the longitudinal length of described L shape workpiece for length, the arc length in the arc bight of described L shape workpiece is wide, the thickness in the arc bight of described workpiece is that height sets up matrix, wherein, the size that stepping in the longitudinal direction scans according to described phased array normal probe at every turn divides, stepping in the direction of the width by be radiated at described workpiece arc bight described ultrasonic beam number divide, the data volume that stepping in the height direction gathers according to described ultrasonic beam divides, then, described A sweep data are read into respectively in described 3D matrix and form 3D matrix,
Described C scan image sets up sub-step, first, the short transverse of 3D matrix is got maximal value A sweep data projection is scanned two-dimensional matrix to by wide and long the formed surface of 3D matrix being formed C, then, carry out image completion and obtain C scan image.
6. method according to claim 5, wherein sets up at C scan image the step that sub-step comprises image denoising and Iamge Segmentation process.
7. method according to claim 1, wherein also comprise next L shape workpiece sensing step of step (g), R represents the radius in the arc bight of next L shape workpiece described, r represents the radius in the geometric parameter in the arc bight of the described L shape workpiece detected in step (a), when | during R-r|≤1, parameter and the position of described phased array normal probe remain unchanged, and detect according to step (c)-(f).
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| CN103424475B (en) * | 2013-04-08 | 2015-09-30 | 上海飞机制造有限公司 | Based on the tested surface contour extraction method of phased array ultrasonic detection |
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