CN102749884B - Light transmission scanning-detecting controlling method for ceramic antenna cover - Google Patents
Light transmission scanning-detecting controlling method for ceramic antenna cover Download PDFInfo
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Abstract
The invention relates to a light transmission scanning-detecting controlling method for a ceramic antenna cover. The light transmission scanning-detecting controlling method comprises the following steps of: (1) locating a coordinate position of a starting point of a laser ranging image collection head; (2) measuring a starting coordinate position of a scanning control point through focusing; (3) determining a coordinate position of the scanning control point of an antenna cover and a scanning incidence angle according to a method selected by track calculation and equal error control points; (4) calculating a light source coordinate moving position according to the scanning incidence angle of each scanning control point; (5) carrying out compiling of a scanning control NC program on a scanning path, a scanning incidence angle and a light source according to a line point position control mode; (6) calculating according to a visual angle of a laser ranging image acquisition head and a scanning row central section outer edge curve to compile a circular scanning NC program; and (7) controlling the laser ranging image acquisition head to carry out image acquisition on the antenna cover and carry out processing and analyzing to obtain crack and loose texture defect parameters of the ceramic antenna cover to be used for quality judgment.
Description
Technical field
The present invention relates to a kind of ceramic antenna Lacquer finish transmission scan and detect control method, belong to technical field of nondestructive testing.
Background technology
After thin-walled ceramic radome production, inevitably there is the defects such as crackle, quality are loosened, hole.In current thin-walled ceramic radome product detects, above-mentioned defect is all detected by transmitted light source and eye-observation by testing staff, workman works under high-pressure, continuous working environment, human eye is easily tired, and cannot guarantee the accuracy detecting, the testing result that can not obtain accurately, quantize, such detection method, cannot guarantee the final mass of product.
Summary of the invention
The object of this invention is to provide a kind ofly can overcome above-mentioned defect, easy to operate, automatic sampling, detect accurately, ceramic antenna Lacquer finish transmission scan that efficiency is high detects control method.Its technical scheme is:
A kind of ceramic antenna Lacquer finish transmission scan detects control method, it is characterized in that adopting following steps: 1) the laser ranging image collecting joint starting point coordinate position of location light transmission scan; 2) by focusing, record the origin coordinates position of scan control point; 3) according to following the tracks of, calculate and the way chosen of equal error reference mark, determine the firing angle that is scanned into of the coordinate position of each scan line scan control point of ceramic radome and corresponding laser ranging image collecting joint; 4), according to the firing angle that is scanned into of the coordinate position of each scan control point and laser ranging image collecting joint, calculate the light source coordinate position of corresponding scan control point on ceramic radome axis; 5) by rectilinear point position movement control mode, to scan control point, be scanned into firing angle, light source position carries out the establishment of scan control NC program; 6) according to the visual angle of laser ranging image collecting joint and equal error control method, the outer counter of each scan line central cross-section is calculated, determine the circular scan number of times of each scan line, the NC program of establishment circular scan; 7) control laser ranging image collecting joint is got back to the origin coordinates position of scan control point, NC program according to establishment scans and image acquisition ceramic radome, the image gathering is processed and analyzed simultaneously, obtain the defect parameters of ceramic radome, according to the judgement to defect situation, determine whether to stop scanning execution the warning of trace routine.
Described ceramic antenna Lacquer finish transmission scan detects control method, in step 1), initialization system coordinate system: using the central axis of ceramic radome as y axle, using radius of circle at the bottom of crossing ceramic radome as x axle, using the end radius of circle perpendicular to x axle as z axle, true origin is O; In coordinate system, by adjusting the position of laser ranging image collecting joint, make laser ranging image collecting joint be positioned at over top, and the Emission Lasers direction of laser ranging image collecting joint and place, ceramic radome summit normal parallel.
Described ceramic antenna Lacquer finish transmission scan detects control method, step 2) in, adjust the distance of laser ranging image collecting joint to ceramic radome surface, when clear picture that laser ranging image collecting joint collects, now laser ranging image collecting joint loca is the origin coordinates position of scan control point, the coordinate figure of record start position, and recording laser range images collection head is to the distance value on ceramic radome surface, be designated as d, the firing angle that is scanned into of laser ranging image collecting joint corresponding to the reference position of scan control point is initial angle, is designated as J1.
Described ceramic antenna Lacquer finish transmission scan detects control method, and step 3) comprises the following steps:
Step is 1.: keeping the firing angle that is scanned into of laser ranging image collecting joint is J1, from initial scan control point, laser ranging image collecting joint moves a very little distance δ to x axle positive dirction, adjust laser ranging image collecting joint at the axial height of y, make laser ranging image collecting joint equal d to the distance on ceramic radome surface, laser ranging image collecting joint loca is an equidistant reference mark of ceramic radome outline line, coordinate and distance value d by this point can calculate the coordinate of putting on the ceramic radome outline line corresponding to this point, use the same method like this and can obtain next equidistant reference mark and corresponding to the coordinate of putting on ceramic radome outline line, when to x direction of principal axis motion n step, connect initial scan control point and n equidistant reference mark, try to achieve the angle of line segment and x axle as the firing angle that is scanned into of next laser ranging image collecting joint, be designated as J2,
Step is 2.: the firing angle that is scanned into of adjusting laser ranging image collecting joint is J2, from step last equidistant reference mark of ceramic radome outline line 1., carry out as step in 1. identical tracking calculate, obtain the equidistant reference mark of n and corresponding to the coordinate of putting on ceramic radome outline line, then connect n and the n point in equidistant reference mark at the 1st, try to achieve the angle of line segment and x axle as the firing angle that is scanned into of next laser ranging image collecting joint, be designated as J3; Utilize step 1., step 2. in identical tracking and calculating method just can obtain the equidistant reference mark of whole ceramic radome and corresponding to the coordinate of putting on ceramic radome outline line, wherein n determines according to the radius-of-curvature of ceramic radome outer contour;
Step is 3.: in step 1., step 2. in, from the reference position of scan control point, often obtain the coordinate of putting on ceramic radome outline line corresponding to equidistant reference mark, just calculate this point and the initial scan control point distance corresponding to line segment between putting on ceramic radome outline line, calculate the distance of putting line segment on ceramic radome outline line corresponding to all the other equidistant reference mark, the distance value obtaining and equal error controlled quentity controlled variable e compare, between 2, distance value and the laser ranging image collecting joint of line segment compare adopting as visual field width value B of ceramic radome simultaneously, if both do not exceed corresponding e, B value, carry out the acquisition at next equidistant reference mark, if there is an amount to reach corresponding value, the most end point using the equidistant reference mark of this last acquisition as this scan line, connect this point and starting point, the angle that calculates line segment and x axle is as the firing angle that is scanned into of the laser ranging image collecting joint of first scan line, be designated as α, equidistant reference mark is the scan control point as first scan line apart from the nearest point of line segment, wherein equal error controlled quentity controlled variable e and laser ranging image collecting joint are to determine according to the picture performance of adopting of laser ranging image collecting joint adopting of ceramic radome as visual field width value B,
Step is 4.: using step 3. in the most end point of the first scan line as the starting point of new scan line, the laser ranging image collecting joint at most end reference mark be scanned into the initial incidence angle of firing angle as new scan line, carry out as step 1., step 2., step operation 3., obtain the firing angle that is scanned into of the scan control point of new scan line and laser ranging image collecting joint, go on so successively, just can obtain the scan control point of the each scan line of ceramic radome and be scanned into firing angle.
Described ceramic antenna Lacquer finish transmission scan detects control method, in step 4), for the scan control point of the each scan line obtaining in step 3) and the corresponding firing angle that is scanned into, from scan control point along scanning incident direction lead-in wire, be this scan control with the intersection point of y axle and put corresponding light source control point.
Described ceramic antenna Lacquer finish transmission scan detects control method, in step 5), the scan control point that obtains according to step 3), be scanned into the light source control point obtaining in firing angle and step 4), by rectilinear point position movement control mode, carry out the establishment of NC program, generate scan line control NC program.
Described ceramic antenna Lacquer finish transmission scan detects control method, in step 6), according to the coordinate figure at the scan line reference mark obtaining in step 3), be scanned into firing angle and the laser ranging image collecting joint distance value d to ceramic radome surface, calculate the radius of scan line central core cross section outer counter, calculated curve action equals the chord length of equal error controlled quentity controlled variable e value in step 4), if being less than step 4), chord length adopts picture visual field width value B, scan columns using the corresponding circular arc of string as circular scan, if being greater than step 4), chord length adopts picture visual field width value B, chord length equals the corresponding circular arc of string of visual field width value B as a scan columns of circular scan, by the corresponding central angle of scan columns circular arc, can calculate the number of times that gathers image on each scan line, thereby the NC program of establishment circular scan.
Described ceramic antenna Lacquer finish transmission scan detects control method, in step 7), the coloured image gathering is carried out to gray processing processing successively, binary conversion treatment, remove noise treatment, Thinning process and edge detection process, crackle after traversal Thinning process, obtain crack length, by the shared pixel count in statistics gas hole defect district, obtain gas hole defect area, obtain the defect parameters of ceramic radome, defect parameters and mass parameter controlled quentity controlled variable compare, if be less than quality control amount, scan to detect and proceed, if be greater than quality control amount, scan detection and stop and reporting to the police.
Compared with prior art, its advantage is in the present invention:
1, the present invention adopts automatic technology to scan and adopt picture ceramic radome, adopts the method for image processing to judge workpiece quality, makes testing result more accurate, objective.
2, the method that ceramic antenna Lacquer finish transmission scan detection method of the present invention adopts setting threshold and mass parameter to compare determines whether and scrap, and reminds workman to carry out manual confirmation by automatic alarm, makes result of determination more accurate.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the present invention obtains the equidistant reference mark of ceramic radome outline line;
Fig. 2 is the present invention's scan control point of obtaining each scan line of ceramic radome, the schematic diagram that is scanned into firing angle and corresponding light source coordinate figure and each scan line central cross-section outer counter radius;
Fig. 3 is the present invention obtains sweep length on each circumference schematic diagram according to equal error controlled quentity controlled variable e;
Fig. 4 is the present invention obtains sweep length on each circumference schematic diagram according to laser ranging figure phase acquisition head visual field width B.
In figure: 1, ceramic radome
Embodiment
To end radius of circle, be that the high ceramic radome 1 for 500mm of 200mm, cone detects, first initialization system coordinate system: using the central axis of ceramic radome 1 as y axle, to cross 1 end of ceramic radome radius of circle as x axle, using the end radius of circle perpendicular to x axle as z axle, true origin is O, then carries out following steps:
Step 1): as shown in fig. 1, in coordinate system, pass through to adjust the position of laser ranging image collecting joint, make it be positioned at the Q point of ceramic radome 1 over top one segment distance, and make the Emission Lasers direction of laser ranging image collecting joint and the normal parallel at ceramic radome 1 place, summit, adjust the distance of laser ranging image collecting joint to ceramic radome 1 surface, when clear picture that laser ranging image collecting joint collects, now N1 point in laser ranging image collecting joint place is the starting point of scan control point, corresponding to the point on ceramic radome 1 outline line, be M1, record N1, the coordinate that M1 is ordered and N1, distance value between 2 of M1 is d, the firing angle that is scanned into of laser ranging image collecting joint corresponding to the reference position of scan control point is initial angle, be designated as J1, d value is 80mm.
Step 2): in Fig. 1, keeping the firing angle that is scanned into of laser ranging image collecting joint is J1, from first scan control point N1, laser ranging image collecting joint moves a very little distance δ to x axle positive dirction, adjust laser ranging image collecting joint at the axial height of y, make laser ranging image collecting joint equal d to the distance on ceramic radome 1 surface, laser ranging image collecting joint loca is the equidistant reference mark N2 of a ceramic radome 1 outline line, coordinate and distance value d by this point can calculate the coordinate corresponding to M2 is ordered on ceramic radome 1 outline line of this point, use the same method like this and can obtain next equidistant reference mark and corresponding to the coordinate of putting on ceramic radome 1 outline line, when obtaining 4 equidistant reference mark N1, N2, N3, during N4, connect initial scan control point N1 and the 4th equidistant reference mark N4, try to achieve the angle of N1N4 line segment and x axle, the firing angle that is scanned into as laser ranging image collecting joint to next section of Contour following, be designated as J2, δ is taken as 2mm.
The firing angle that is scanned into of adjusting laser ranging image collecting joint is β 2, since the 4th equidistant reference mark N4 point, in kind obtain 4 equidistant reference mark N5, N6, N7, N8 and corresponding to the coordinate of putting on ceramic radome 1 outline line, then connect equidistant reference mark N5 and N8, the angle of trying to achieve N5N8 line segment and x axle is the firing angle that is scanned into next section of Contour following as laser ranging image collecting joint, is designated as J3.By that analogy, obtain the equidistant reference mark of whole ceramic radome 1 and corresponding to the coordinate of putting on ceramic radome 1 outline line.
Step 3): as shown in Figure 2, the M1 point that step 1) obtains starts, often obtain the coordinate of putting on ceramic radome 1 outline line corresponding to equidistant reference mark, just calculate the distance of line segment between this point and M1 point, be designated as l, calculate the distance of putting line segment on corresponding ceramic radome 1 outline line of all the other equidistant reference mark, be designated as h, the distance value h obtaining and equal error controlled quentity controlled variable e compare, between 2, distance value l and the laser ranging image collecting joint of line segment compare adopting as visual field width value B of ceramic radome 1 simultaneously, if h, l does not exceed corresponding e, B value, carry out the acquisition at next equidistant reference mark, in Fig. 2, when distance value h is more than or equal to e value, point on ceramic radome 1 the outline line corresponding equidistant reference mark finally obtaining is designated as to S2 point, connect M1, S2 2 points, the angle of line segment M1S2 and x axle is as the firing angle that is scanned into of the laser ranging image collecting joint of first scan line, be designated as α 1, scan control point apart from the nearest equidistant reference mark K1 of line segment M1S2 perpendicular bisector as this scan line, in Fig. 2, when distance value l has exceeded B value, with this, adopt the width that calculates scan line as visual field width value B, as S3, S4 2 points, use the same method and can obtain the scan control point that is scanned into firing angle and scan line of laser ranging image collecting joint, wherein adopting as visual field width value B of equal error controlled quentity controlled variable e and ceramic radome 1 got respectively 5mm and 80mm.
Step 4): the most end point of upper one scan row is as the starting point of new scan line, most end reference mark be scanned into the initial incidence angle of firing angle as new scan line, carry out as step 2), the operation of step 3), obtain the firing angle that is scanned into of the scan control point of new scan line and laser ranging image collecting joint, go on so successively, just can obtain the scan control point of ceramic radome 1 each scan line and be scanned into firing angle.
Step 5): in Fig. 2, the scan control point K1 of scan line and being scanned into after firing angle α 1 of corresponding ligh-ranging image collecting joint have been obtained, from scan control point K1 along scanning incident direction lead-in wire, be with the intersection point D1 of y axle the light source control point that this reference mark K1 is corresponding, same method can controlled some K2, K3, K4 ... light source control point, to obtain scan control point K, be scanned into firing angle α, light source position D, by rectilinear point position movement control mode, carry out the establishment of NC program, generate scan line control NC program.
Step 6): in Fig. 2, the coordinate figure of the scan line scan control point obtaining, be scanned into firing angle and the laser ranging image collecting joint distance value d to ceramic radome 1 surface, calculate scan line central core cross section outer counter radius, then by equal error control method, determine with adopting as the visual field width relative method width that each circular scan is listed as, as being that the action of string A1A2 of curve equals equal error controlled quentity controlled variable e value in Fig. 3, the length value of string A1A2 is less than adopts picture visual field width value B, the corresponding circular arc of string A1A2 is a scan columns, by the corresponding central angle V of string A1A2, can be calculated the scanning times of each circumference, as the action of the string A1A2 of curve in Fig. 4 is less than equal error controlled quentity controlled variable e value, but the length value of string A1A2 equals to adopt picture visual field width value B, with the corresponding circular arc of this string A1A2, be a scan columns, by the corresponding central angle V of string A1A2, can be calculated the scanning times of each circumference, thereby the NC program of establishment circular scan.
Scanning control system control laser ranging image collecting joint is got back to the reference position Q point of scan control point, NC program according to establishment scans and image acquisition ceramic radome 1, the coloured image gathering is carried out to gray processing processing, binary conversion treatment, removal noise treatment, Thinning process and edge detection process successively, crackle after traversal Thinning process, obtain crack length, by the shared pixel count in statistics gas hole defect district, obtain gas hole defect area, obtain the defect parameters of ceramic radome 1.It is that 4mm, stomatal size are 10mm that experiment is made as crack length by the quality control amount of ceramic radome
2, in scanning process, at any time the defect parameters of the ceramic radome of acquisition 1 and quality control amount are compared, if defect parameters is less than quality control amount, continues scanning and detect, otherwise scanning detects and stops and producing warning.On this test target ceramic radome 1, because there being place's gross blow hole, stomatal size is 39.85mm
2so, detect and stop, and produced warning.
Claims (4)
1. ceramic antenna Lacquer finish transmission scan detects a control method, it is characterized in that adopting following steps:
1) the laser ranging image collecting joint starting point coordinate position of location light transmission scan, specifically: using the central axis of ceramic radome as y axle, using radius of circle at the bottom of crossing ceramic radome as x axle, using the end radius of circle perpendicular to x axle as z axle, true origin is O, initialization system coordinate system; In coordinate system, by adjusting the position of laser ranging image collecting joint, make laser ranging image collecting joint be positioned at over top, and the Emission Lasers direction of laser ranging image collecting joint and place, ceramic radome summit normal parallel;
2) by focusing, record the origin coordinates position of scan control point, specifically: adjust the distance of laser ranging image collecting joint to ceramic radome surface, when clear picture that laser ranging image collecting joint collects, now laser ranging image collecting joint loca is the origin coordinates position of scan control point, the coordinate figure of record start position, and recording laser range images collection head is to the distance value on ceramic radome surface, be designated as d, the firing angle that is scanned into of laser ranging image collecting joint corresponding to the reference position of scan control point is initial angle, is designated as J1;
3) according to following the tracks of, calculate and the way chosen of equal error reference mark, determine the firing angle that is scanned into of the coordinate position of each scan line scan control point of ceramic radome and corresponding laser ranging image collecting joint, comprise the following steps:
Step is 1.: keeping the firing angle that is scanned into of laser ranging image collecting joint is J1, from initial scan control point, laser ranging image collecting joint moves a very little distance δ to x axle positive dirction, adjust laser ranging image collecting joint at the axial height of y, make laser ranging image collecting joint equal d to the distance on ceramic radome surface, laser ranging image collecting joint loca is an equidistant reference mark of ceramic radome outline line, coordinate and distance value d by this point can calculate the coordinate of putting on the ceramic radome outline line corresponding to this point, use the same method like this and can obtain next equidistant reference mark and corresponding to the coordinate of putting on ceramic radome outline line, when to x direction of principal axis motion n step, connect initial scan control point and n equidistant reference mark, try to achieve the angle of line segment and x axle as the firing angle that is scanned into of next laser ranging image collecting joint, be designated as J2,
Step is 2.: the firing angle that is scanned into of adjusting laser ranging image collecting joint is J2, from step last equidistant reference mark of ceramic radome outline line 1., carry out as step in 1. identical tracking calculate, obtain the equidistant reference mark of n and corresponding to the coordinate of putting on ceramic radome outline line, then connect n and the n point in equidistant reference mark at the 1st, try to achieve the angle of line segment and x axle as the firing angle that is scanned into of next laser ranging image collecting joint, be designated as J3; Utilize step 1., step 2. in identical tracking and calculating method just can obtain the equidistant reference mark of whole ceramic radome and corresponding to the coordinate of putting on ceramic radome outline line, wherein n determines according to the radius-of-curvature of ceramic radome outer contour;
Step is 3.: in step 1., step 2. in, from the reference position of scan control point, often obtain the coordinate of putting on ceramic radome outline line corresponding to equidistant reference mark, just calculate this point and the initial scan control point distance corresponding to line segment between putting on ceramic radome outline line, calculate the distance of putting line segment on ceramic radome outline line corresponding to all the other equidistant reference mark, the distance value obtaining and equal error controlled quentity controlled variable e compare, between 2, distance value and the laser ranging image collecting joint of line segment compare adopting as visual field width value B of ceramic radome simultaneously, if both do not exceed corresponding e, B value, carry out the acquisition at next equidistant reference mark, if there is an amount to reach corresponding value, the most end point using the equidistant reference mark of this last acquisition as this scan line, connect this point and starting point, the angle that calculates line segment and x axle is as the firing angle that is scanned into of the laser ranging image collecting joint of first scan line, be designated as α, equidistant reference mark is the scan control point as first scan line apart from the nearest point of line segment, wherein equal error controlled quentity controlled variable e and laser ranging image collecting joint are to determine according to the picture performance of adopting of laser ranging image collecting joint adopting of ceramic radome as visual field width value B,
Step is 4.: using step 3. in the most end point of the first scan line as the starting point of new scan line, the laser ranging image collecting joint at most end reference mark be scanned into the initial incidence angle of firing angle as new scan line, carry out as step 1., step 2., step operation 3., obtain the firing angle that is scanned into of the scan control point of new scan line and laser ranging image collecting joint, go on so successively, just can obtain the scan control point of the each scan line of ceramic radome and be scanned into firing angle;
4), according to the firing angle that is scanned into of the coordinate position of each scan control point and laser ranging image collecting joint, calculate the light source coordinate position of corresponding scan control point on ceramic radome axis;
5) by rectilinear point position movement control mode, to scan control point, be scanned into firing angle, light source position carries out the establishment of scan control NC program;
6) according to the visual angle of laser ranging image collecting joint and equal error control method, the outer counter of each scan line central cross-section is calculated, determine the circular scan number of times of each scan line, the NC program of establishment circular scan, specifically: according to the coordinate figure at the scan line reference mark obtaining in step 3), be scanned into firing angle and the laser ranging image collecting joint distance value d to ceramic radome surface, calculate the radius of scan line central core cross section outer counter, calculated curve action equals the chord length of equal error controlled quentity controlled variable e value in step 4), if being less than step 4), chord length adopts picture visual field width value B, scan columns using the corresponding circular arc of string as circular scan, if being greater than step 4), chord length adopts picture visual field width value B, chord length equals the corresponding circular arc of string of visual field width value B as a scan columns of circular scan, by the corresponding central angle of scan columns circular arc, can calculate the number of times that gathers image on each scan line, thereby the NC program of establishment circular scan,
7) control laser ranging image collecting joint is got back to the origin coordinates position of scan control point, NC program according to establishment scans and image acquisition ceramic radome, the image gathering is processed and analyzed simultaneously, obtain the defect parameters of ceramic radome, according to the judgement to defect situation, determine whether to stop scanning execution the warning of trace routine.
2. ceramic antenna Lacquer finish transmission scan as claimed in claim 1 detects control method, it is characterized in that: in step 4), for the scan control point of the each scan line obtaining in step 3) and the corresponding firing angle that is scanned into, from scan control point along scanning incident direction lead-in wire, be this scan control with the intersection point of y axle and put corresponding light source control point.
3. ceramic antenna Lacquer finish transmission scan as claimed in claim 1 detects control method, it is characterized in that: in step 5), according to step 3) obtain scan control point, be scanned into the light source control point obtaining in firing angle and step 4), by rectilinear point position movement control mode, carry out the establishment of NC program, generate scan line control NC program.
4. ceramic antenna Lacquer finish transmission scan as claimed in claim 1 detects control method, it is characterized in that: in step 7), the coloured image gathering is carried out to gray processing processing successively, binary conversion treatment, remove noise treatment, Thinning process and edge detection process, crackle after traversal Thinning process, obtain crack length, by the shared pixel count in statistics gas hole defect district, obtain gas hole defect area, obtain the defect parameters of ceramic radome, defect parameters and mass parameter controlled quentity controlled variable compare, if be less than quality control amount, scan to detect and proceed, if be greater than quality control amount, scan detection and stop and reporting to the police.
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