CN108168456A - A new method is taken in a kind of laser scanning inspection - Google Patents
A new method is taken in a kind of laser scanning inspection Download PDFInfo
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- CN108168456A CN108168456A CN201711443519.7A CN201711443519A CN108168456A CN 108168456 A CN108168456 A CN 108168456A CN 201711443519 A CN201711443519 A CN 201711443519A CN 108168456 A CN108168456 A CN 108168456A
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- detection device
- characteristic edge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a new method is taken in a kind of laser scanning inspection, belong to field of machining technology, the present invention, along benchmark is made reference, searches direction, suitable edge is got in guarantee by characteristic edge most reliable near measurement point position by setting characteristic edge；By the amount of specifying Offsets, get correct measurement point position, it can set simultaneously and take a width, for doing the processing of some smothing filterings, medium filtering etc, so that measurement data is more stable, it solves the problems, such as that part measuring point position degree deviation itself causes to measure to take a point position there are deviations, without additionally increasing vision system, reduces cost；Point sampling method of the present invention is flexible, and optional more stable edge is used as with reference to benchmark, and guarantee takes a success rate and stability.
Description
Technical field
The invention belongs to field of machining technology, a new method is taken in more particularly to a kind of laser scanning inspection.
Background technology
Laser scanning inspection is the detection device rapid extraction piece surface profile information for carrying laser displacement sensor
A kind of mode.After correctly extraction profile information, equipment usually requires to carry out geometry calculating according to preset measurement position, with
To the machining deviation of the short transverse of the part.And since part each section itself has the position degree deviation of processing, cause i.e.
After the perfect work piece holder of equipment choosing is made to carry out part fixation, still preferable value meter can not be carried out in accurate measurement point position
It calculates.
The objective shortcoming of existing laser detection system：
1. existing laser detection system ignores influence caused by this deviation more, directly in the preset of piece surface profile position
It takes and is a little calculated, introduce larger measurement error.
2. (each site location degree deviation in part X/Y plane direction) or needs take especially when part machining deviation is larger
Measurement point position where characteristic edge narrower width when, even result in measuring system take it is wrong measure position, cause measurement data invalid.
3. to solve problems, a part of equipment has introduced vision module to carry out product space positioning, this usually increases
Equipment complexity and equipment cost are added.
Invention content
The object of the present invention is to provide a new method is taken in a kind of laser scanning inspection, solves the prior art not
Foot.
To achieve the above object, the present invention uses following technical scheme：
A new method is taken in a kind of laser scanning inspection, is included the following steps：
Step 1：The work in-process heart completes the contour machining of part, and the machining center, which is matched, to be arranged with to scan part
The detection device containing laser displacement sensor；
Step 2：Four are set in detection device and takes a parameter, described four take a parameter to include feature height, feature
Direction is searched, an offset is taken and takes a width in side；
The feature height is not higher than the profile elevations h of part；The characteristic edge search direction for from left to right or from the right side to
It is left；
Step 3：Scan path is preset in detection device, laser displacement sensor is along piece surface according to scan path
It is scanned；The surface profile shape data of part is obtained after scanning；Detection device controls laser displacement sensor along characteristic edge
Direction and feature height are searched in piece surface into line search, by laser displacement sensor by look for that feature height searches first
Edge on a parts profile is as characteristic edge；Coordinate where detection device record characteristic edge；
Step 4：Detection device is based on the coordinate of characteristic edge, according to taking the value of an offset into line displacement：It takes a little
Offset is positive number or negative, an offset is taken then to be deviated to the right if just, i.e. coordinate forward migration；Take an offset if
It is negative, then it deviates to the left, i.e. coordinate negative offset, after offset, the seat of characteristic edge of the detection device according to feature height and after deviating
Mark obtains a measuring center point coordinates；
Step 5：On the obtained piece surface profile of scanning, using measuring center point as basic point, according to taking a width zero
The measurement band for calculating is established on the profile of part, the midpoint for measuring band is measuring center point, and detection device extraction, which measures, to be taken
Contour shape, it is discrete to turn to data point set；Each point in data point set includes a coordinate value and a height value；
Step 6：The coordinate upward to the z-axis of all the points in the data point set that is obtained in step 5 is filtered, and is obtained
The height value of measuring center point coordinates is corresponded to piece surface.
When performing step 6, the filtering process used is smothing filtering or medium filtering.
The value of the offset depends on measuring the width of step, sets the step width adjacent with characteristic edge as W, then
Offset is usually taken to be W/2；The value for taking a width is W/4.
When performing step 5, coordinate value is x-axis to the coordinate upward with y-axis, the height value coordinate upward for z-axis.
A new method is taken in a kind of laser scanning inspection of the present invention, solves part measuring point position degree itself
Deviation, which causes to measure, takes a point position to there are problems that deviation, without additionally increasing vision system, reduces cost；The present invention takes a side
Method is flexible, and optional more stable edge is used as with reference to benchmark, and guarantee takes a success rate and stability.
Description of the drawings
Fig. 1 be the present invention take a schematic diagram.
Specific embodiment
A new method is taken in a kind of laser scanning inspection as shown in Figure 1, is included the following steps：
Step 1：The work in-process heart completes the contour machining of part, and the machining center, which is matched, to be arranged with to scan part
The detection device containing laser displacement sensor；Such as：The part that Cutter Body Processing with Machining Center is crossed is placed on equipped with Keyemce LK-
It is detected in the ORG500 type equipment of G5000 series dot lasers, present invention is typically used in plate, notebook centers in detection mobile phone etc. to contain
The detection application of step-feature, the step on part is measures step.Workpiece is fixed on on part special fixture, keeping steady
Gu.Scanning is divided into that gauge head travelling workpiece is fixed or gauge head is static, two kinds of situations of workpiece motion s.Programming be by detecting instrument from
The computer programming of band, for the point position that teaching measures, motion path, data calculating etc..
Step 2：Four are set in detection device and takes a parameter, described four take a parameter to include feature height, feature
Direction is searched, an offset is taken and takes a width in side；
The feature height is not higher than the profile elevations h of part；The characteristic edge search direction for from left to right or from the right side to
It is left；
Step 3：Scan path is preset in detection device, laser displacement sensor is along piece surface according to scan path
It is scanned；The surface profile shape data of part is obtained after scanning；Detection device controls laser displacement sensor along characteristic edge
Direction and feature height are searched in piece surface into line search, by laser displacement sensor by look for that feature height searches first
Edge on a parts profile is as characteristic edge；Coordinate where detection device record characteristic edge；
Step 4：Detection device is based on the coordinate of characteristic edge, according to taking the value of an offset into line displacement：It takes a little
Offset is positive number or negative, an offset is taken then to be deviated to the right if just, i.e. coordinate forward migration；Take an offset if
It is negative, then it deviates to the left, i.e. coordinate negative offset, after offset, the seat of characteristic edge of the detection device according to feature height and after deviating
Mark obtains a measuring center point coordinates；
Step 5：On the obtained piece surface profile of scanning, using measuring center point as basic point, according to taking a width zero
The measurement band for calculating is established on the profile of part, the midpoint for measuring band is measuring center point, and detection device extraction, which measures, to be taken
Contour shape, it is discrete to turn to data point set；Each point in data point set includes a coordinate value and a height value；
Step 6：The coordinate upward to the z-axis of all the points in the data point set that is obtained in step 5 is filtered, and is obtained
The height value of measuring center point coordinates is corresponded to piece surface.
When performing step 6, the filtering process used is smothing filtering or medium filtering.
The value of the offset depends on measuring the width of step, sets the step width adjacent with characteristic edge as W, then
Offset is usually taken to be W/2；The value for taking a width is W/4.
When performing step 5, coordinate value is x-axis to the coordinate upward with y-axis, the height value coordinate upward for z-axis.
As shown in Figure 1, laser displacement sensor is searched in the Z-axis direction according to feature height H1 or H2 along characteristic edge first
Seek scanning direction, in Fig. 1 characteristic edge search direction for from left to right when, feature height H1；It is from the right side that characteristic edge, which searches direction,
When extremely left, feature height H2；
For being from left to right by characteristic edge search direction, when scanning is to parts profile, by the side of the profile scanned
As characteristic edge B；
Laser displacement sensor, into line displacement, obtains measuring center point Q according to taking an offset a on the basis of characteristic edge B；
Using measuring center point Q as basic point, band is measured according to a width d is taken to be established on the profile of part, is measured in band
Point is measuring center point Q, and laser displacement sensor takes in measurement and takes multiple measurements, and obtains the coordinate value of multiple measurement points；
The coordinate value of all measurement points is filtered, obtains the coordinate of accurate measurement point position, for follow-up geometry
It calculates and uses.
A new method is taken in a kind of laser scanning inspection of the present invention, solves part measuring point position degree itself
Deviation, which causes to measure, takes a point position to there are problems that deviation, without additionally increasing vision system, reduces cost；The present invention takes a side
Method is flexible, and optional more stable edge is used as with reference to benchmark, and guarantee takes a success rate and stability.
Claims (4)
1. take a new method in a kind of laser scanning inspection, it is characterised in that：Include the following steps：
Step 1：The work in-process heart completes the contour machining of part, and the machining center, which is matched, to be arranged with to scan containing for part
The detection device of laser displacement sensor；
Step 2：Four are set in detection device and takes a parameter, described four take a parameter to be searched including feature height, characteristic edge
Direction is sought, take an offset and takes a width；
The feature height is not higher than the profile elevations h of part；The characteristic edge searches direction as from left to right or from right to left；
Step 3：Scan path is preset in detection device, laser displacement sensor is carried out along piece surface according to scan path
Scanning；The surface profile shape data of part is obtained after scanning；Detection device controls laser displacement sensor along characteristic edge search
Direction and feature height in piece surface into line search, by laser displacement sensor by look for that feature height searches first zero
Edge on part profile is as characteristic edge；Coordinate where detection device record characteristic edge；
Step 4：Detection device is based on the coordinate of characteristic edge, according to taking the value of an offset into line displacement：Take an offset
It measures as positive number or negative, an offset is taken then to be deviated to the right if just, i.e. coordinate forward migration；An offset is taken if bearing, then
It deviates to the left, i.e. coordinate negative offset, after offset, detection device is obtained according to the coordinate of the characteristic edge after feature height and offset
One measuring center point coordinates；
Step 5：On the obtained piece surface profile of scanning, using measuring center point as basic point, according to taking a width in part
The measurement band for calculating is established on profile, the midpoint for measuring band is measuring center point, and detection device extraction measures the wheel taken
Profile shape, it is discrete to turn to data point set；Each point in data point set includes a coordinate value and a height value；
Step 6：The coordinate upward to the z-axis of all the points in the data point set that is obtained in step 5 is filtered, and obtains zero
Part surface corresponds to the height value of measuring center point coordinates.
2. take a new method in a kind of laser scanning inspection as described in claim 1, it is characterised in that:Performing step 6
When, the filtering process used is smothing filtering or medium filtering.
3. take a new method in a kind of laser scanning inspection as described in claim 1, it is characterised in that:The offset
Value depends on measuring the width of step, sets the step width adjacent with characteristic edge as W, then offset is usually taken to be W/2；Institute
State take a width value be W/4.
4. take a new method in a kind of laser scanning inspection as described in claim 1, it is characterised in that:When performing step 5,
Coordinate value is x-axis to the coordinate upward with y-axis, the height value coordinate upward for z-axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711443519.7A CN108168456B (en) | 2017-12-27 | 2017-12-27 | Point taking method in laser scanning detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711443519.7A CN108168456B (en) | 2017-12-27 | 2017-12-27 | Point taking method in laser scanning detection |
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| CN108168456A true CN108168456A (en) | 2018-06-15 |
| CN108168456B CN108168456B (en) | 2020-06-12 |
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| CN201711443519.7A Active CN108168456B (en) | 2017-12-27 | 2017-12-27 | Point taking method in laser scanning detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118089547A (en) * | 2024-04-23 | 2024-05-28 | 杭州芯海半导体技术有限公司 | Determination method and device for regional center point coordinates and intelligent warehouse system |
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| EP0642101A2 (en) * | 1993-09-01 | 1995-03-08 | International Business Machines Corporation | A wide line drawing method |
| JP2008141098A (en) * | 2006-12-05 | 2008-06-19 | Dainippon Screen Mfg Co Ltd | Inspecting equipment for substrate carrier, and substrate treating equipment |
| CN104443423A (en) * | 2013-09-18 | 2015-03-25 | 爱乐基股份有限公司 | Correction positioning method of aircraft entering guide system |
| CN105824237A (en) * | 2016-03-11 | 2016-08-03 | 西北工业大学 | Line-laser-sensor-based adaptive deviation control method |
| CN106504407A (en) * | 2016-11-01 | 2017-03-15 | 深圳怡化电脑股份有限公司 | A kind of method and device for processing banknote image |
| CN107030687A (en) * | 2016-02-04 | 2017-08-11 | 上海晨兴希姆通电子科技有限公司 | Position bias detecting method and module, crawl position calibration method, grasping system |
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2017
- 2017-12-27 CN CN201711443519.7A patent/CN108168456B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0642101A2 (en) * | 1993-09-01 | 1995-03-08 | International Business Machines Corporation | A wide line drawing method |
| JP2008141098A (en) * | 2006-12-05 | 2008-06-19 | Dainippon Screen Mfg Co Ltd | Inspecting equipment for substrate carrier, and substrate treating equipment |
| CN104443423A (en) * | 2013-09-18 | 2015-03-25 | 爱乐基股份有限公司 | Correction positioning method of aircraft entering guide system |
| CN107030687A (en) * | 2016-02-04 | 2017-08-11 | 上海晨兴希姆通电子科技有限公司 | Position bias detecting method and module, crawl position calibration method, grasping system |
| CN105824237A (en) * | 2016-03-11 | 2016-08-03 | 西北工业大学 | Line-laser-sensor-based adaptive deviation control method |
| CN106504407A (en) * | 2016-11-01 | 2017-03-15 | 深圳怡化电脑股份有限公司 | A kind of method and device for processing banknote image |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118089547A (en) * | 2024-04-23 | 2024-05-28 | 杭州芯海半导体技术有限公司 | Determination method and device for regional center point coordinates and intelligent warehouse system |
| CN118089547B (en) * | 2024-04-23 | 2024-07-05 | 杭州芯海半导体技术有限公司 | Determination method and device for regional center point coordinates and intelligent warehouse system |
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| CN108168456B (en) | 2020-06-12 |
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