CN106500633A - A kind of measurement method of planeness - Google Patents

A kind of measurement method of planeness Download PDF

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Publication number
CN106500633A
CN106500633A CN201611243280.4A CN201611243280A CN106500633A CN 106500633 A CN106500633 A CN 106500633A CN 201611243280 A CN201611243280 A CN 201611243280A CN 106500633 A CN106500633 A CN 106500633A
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CN
China
Prior art keywords
plane
measurement
curved surface
measured
measurement point
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Pending
Application number
CN201611243280.4A
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Chinese (zh)
Inventor
靳登科
汪建
鹿呈志
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Suzhou Yimeide Technology Co Ltd
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Suzhou Yimeide Technology Co Ltd
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Publication date
Application filed by Suzhou Yimeide Technology Co Ltd filed Critical Suzhou Yimeide Technology Co Ltd
Priority to CN201611243280.4A priority Critical patent/CN106500633A/en
Publication of CN106500633A publication Critical patent/CN106500633A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/30Measuring arrangements characterised by the use of optical means for measuring roughness or irregularity of surfaces

Abstract

The invention discloses a kind of measurement method of planeness, comprises the following steps:Some measurement points are chosen from plane to be measured first, by the three-dimensional coordinate of measurement point selected by detecting head detection;Secondly the three-dimensional coordinate for measurement point fits plane and curved surface with regard to measurement point height respectively;Then the curved surface that fitting is obtained is carried out gridding, obtains the intersection point and its coordinate of the curved surface and grid;Then calculate the distance along Z-direction between above-mentioned intersection point and the plane that obtains of fitting, using maximum of which value as the plane to be measured flatness value.By detecting the three-dimensional coordinate of measurement point, the three-dimensional coordinate of the measurement point of acquisition is fitted using least square method and obtains a plane, a curved surface is obtained simultaneously using matlab fittings, by curved surface meshing, by calculating the Z-direction distance of the intersection point of curved surface and grid to plane, the flatness of plane to be measured is finally given, measurement point limited amount can be avoided and the detection error that causes, be improve certainty of measurement.

Description

A kind of measurement method of planeness
Technical field
The present invention relates to a kind of measurement method of planeness.
Background technology
With the development of science and technology, smart mobile phone has obtained significant progress, and the live and work of people increasingly cannot be from Smart mobile phone is opened, used as one of topmost part in smart mobile phone, smart mobile phone screen is in process of production for screen table The requirement more and more higher of surface evenness, the flatness of mobile phone screen affect the performance and quality of mobile phone to a great extent.Existing Flatness detecting device complex structure, and detection error is big, fails the needs for meeting actual production.
Content of the invention
The invention provides a kind of measurement method of planeness, multiple to solve structure of the detecting device present in prior art Miscellaneous, and the big problem of detection error.
In order to solve above-mentioned technical problem, the technical scheme is that:A kind of measurement method of planeness, including following step Suddenly:
S1:Some measurement points are chosen from plane to be measured, the three-dimensional coordinate that selected measurement point is detected by detecting head, including X, Y, Z-direction, wherein Z-direction represent height;
S2:Three-dimensional coordinate for measurement point fits plane and curved surface with regard to measurement point height respectively;
S3:The curved surface that fitting is obtained is carried out gridding, the intersection point and its coordinate of grid is obtained;
S4:Calculate and in above-mentioned intersection point and step S2, be fitted distance between the plane for obtaining along Z-direction, by maximum of which value Flatness value as the plane to be measured.
Further, in step S1, also include setting up three-dimensional system of coordinate according to plane to be measured, wherein X, Y-direction are parallel The plane to be measured, the vertical plane to be measured of Z-direction, and forward direction is upward.
Further, in step S1, the measurement point is uniformly distributed in the plane to be measured.
Further, in step S1, the detecting head detects the three of selected measurement point by the way of laser ranging Dimension coordinate.
Further, in step S1, the precision of the three-dimensional coordinate is um.
Further, in step S2, using plane described in least square fitting.
Further, in step S2, the curved surface is fitted using MATLAB softwares.
Further, in step S3, the single lattice in the grid is rectangle.
The measurement method of planeness that the present invention is provided, comprises the following steps:If choosing dry measure first from plane to be measured Point, by the three-dimensional coordinate of measurement point selected by detecting head detection, including X, Y, Z-direction, wherein Z-direction represents height value;Next is directed to The three-dimensional coordinate of measurement point fits plane and the curved surface with regard to measurement point height respectively;Then the curved surface that fitting is obtained is carried out Gridding, obtains the intersection point and its coordinate of grid;Then calculate between above-mentioned intersection point and the plane that obtains of fitting along Z-direction away from From, using maximum of which value as the plane to be measured flatness value.The three-dimensional coordinate that measurement point is detected by detecting head, profit The three-dimensional coordinate of the measurement point of acquisition is fitted with least square method and obtains a plane, while using survey in matlab The three-dimensional coordinate of amount point is fitted and obtains a curved surface, and, used as theoretical planes, the curved surface, will be true used as true curved surface for the plane Real curved surface meshing, by calculating the intersection point of grid to the Z-direction distance of theoretical planes, finally gives the flatness of plane to be measured, The detection error that measurement point limited amount can be avoided and caused, improves certainty of measurement.
Description of the drawings
Fig. 1 is the distribution schematic diagram of measurement point in plane to be measured of the invention;
Fig. 2 is the fitting schematic diagram of plane of the present invention and curved surface.
Shown in figure:1st, plane to be measured;11st, measurement point;2nd, plane;3rd, curved surface.
Specific embodiment
The present invention is described in detail below in conjunction with the accompanying drawings:
As shown in Figure 1-2, a kind of measurement method of planeness of the invention, can carry out flatness detection for all of plane, Comprise the following steps:
S1:Some measurement points 11 are chosen from plane to be measured 1, are sat by the three-dimensional of measurement point 11 selected by detecting head detection Mark, including X, Y, Z-direction, wherein Z-direction represents height;As shown in figure 1, three-dimensional system of coordinate is set up according to plane to be measured 1 first, wherein The parallel plane to be measured 1 of X, Y-direction, the vertical plane to be measured 1 of Z-direction, and forward direction is upward.In the present embodiment, the measurement point 11 are uniformly distributed in the plane to be measured 1, in Fig. 1, and the quantity of measurement point 11 is 64, are uniformly distributed in described treating in 8*8 Survey in plane 1, and 1~64 is numbered successively to measurement point 11, naturally it is also possible to choose more measurement points 11, to improve detection Precision.The detecting head detects the three-dimensional coordinate of selected measurement point 11 by the way of laser ranging, and precision is um, and unit is Mm, the result of measurement is { x1,y1,z1,x2,y2,z2,x3,y3,z3,…,xn,yn,zn, wherein (xi,yi,zi) represent i-th survey The D coordinates value of amount point.
S2:Three-dimensional coordinate for measurement point 11 fits plane 2 and curved surface 3 with regard to 11 height of measurement point respectively;Such as Shown in Fig. 2, theoretical planes (black dotted lines shown in) of its midplane 2 as plane to be measured 1, curved surface 3 are true as plane to be measured 1 Real curved surface (shown in black curve), describes the concavo-convex situation of reality on 1 surface of plane to be measured;Preferably, the plane 2 is using minimum Square law fitting is obtained, and the curved surface 3 is obtained by the meshgrid () function in MATLAB softwares.
S3:The curved surface 3 that fitting is obtained is carried out gridding, the intersection point and its coordinate of grid is obtained;List in the grid Lattice are rectangle, can configure the size of single lattice as needed, and the quantity of single lattice is more, and division is thinner, and acquisition intersection point is more, measurement More accurate.
S4:Calculate and in above-mentioned intersection point and step S2, be fitted distance between the plane 2 for obtaining along Z-direction, by maximum of which It is worth the flatness value as the plane to be measured 1.
In sum, the measurement method of planeness that the present invention is provided, comprises the following steps:Select first from plane to be measured 1 Some measurement points 11 are taken, by the three-dimensional coordinate of measurement point 11 selected by detecting head detection, including X, Y, Z-direction, wherein Z-direction represents height Angle value;Secondly the three-dimensional coordinate for measurement point 11 fits plane 2 and curved surface 3 with regard to 11 height of measurement point respectively;Then The curved surface 3 that fitting is obtained is carried out gridding, the intersection point and its coordinate of grid is obtained;Then calculate above-mentioned intersection point to obtain with fitting Plane between along Z-direction distance, using maximum of which value as the plane to be measured 1 flatness value.Visited by detecting head Survey measurement point 11 three-dimensional coordinate, the three-dimensional coordinate of the measurement point of acquisition is fitted using least square method obtain one put down Face 2, while the three-dimensional coordinate using measurement point in matlab is fitted and obtains a curved surface 3, the plane 2 is used as theoretical flat Face, used as true curved surface, by true curved surface meshing, the coordinate of the grid intersection point for obtaining, by calculating the friendship of grid for the curved surface 3 Point finally gives the flatness of plane to be measured 1, can avoid 11 limited amount of measurement point and cause to the Z-direction distance of theoretical planes Detection error, improves certainty of measurement.
Although being illustrated to embodiments of the present invention in specification, these embodiments are intended only as pointing out, Should not limit protection scope of the present invention.Various omissions, displacement and change are carried out without departing from the spirit and scope of the present invention Should include within the scope of the present invention.

Claims (8)

1. a kind of measurement method of planeness, it is characterised in that comprise the following steps:
S1:Choose some measurement points from plane to be measured, by detecting head detection selected by measurement point three-dimensional coordinate, including X, Y, Z-direction, wherein Z-direction represent height;
S2:Three-dimensional coordinate for measurement point fits plane and curved surface with regard to measurement point height respectively;
S3:The curved surface that fitting is obtained is carried out gridding, the intersection point and its coordinate of grid is obtained;
S4:Calculate and in above-mentioned intersection point and step S2, be fitted distance between the plane for obtaining along Z-direction, using maximum of which value as The flatness value of the plane to be measured.
2. measurement method of planeness according to claim 1, it is characterised in that in step S1, is also included according to treating Survey plane and set up three-dimensional system of coordinate, the parallel plane to be measured of wherein X, Y-direction, the vertical plane to be measured of Z-direction, and positive court On.
3. measurement method of planeness according to claim 1, it is characterised in that in step S1, the measurement point is equal Even it is distributed in the plane to be measured.
4. measurement method of planeness according to claim 1, it is characterised in that in step S1, the detecting head is adopted The three-dimensional coordinate that selected measurement point is detected with the mode of laser ranging.
5. measurement method of planeness according to claim 4, it is characterised in that in step S1, the three-dimensional coordinate Precision be um.
6. measurement method of planeness according to claim 1, it is characterised in that in step S2, using least square Method is fitted the plane.
7. measurement method of planeness according to claim 1, it is characterised in that in step S2, soft using MATLAB Part is fitted the curved surface.
8. measurement method of planeness according to claim 1, it is characterised in that in step S3, in the grid Single lattice is rectangle.
CN201611243280.4A 2016-12-29 2016-12-29 A kind of measurement method of planeness Pending CN106500633A (en)

Priority Applications (1)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107270862A (en) * 2017-07-14 2017-10-20 杭州星帅尔电器股份有限公司 The detection method of heating wire flatness in Miniature heat protector
CN107424149A (en) * 2017-07-20 2017-12-01 晓视自动化科技(上海)有限公司 The module measurement method of planeness and equipment of view-based access control model technology
CN108225212A (en) * 2018-01-04 2018-06-29 苏州逸美德科技有限公司 Bend glass profile tolerance detection method
CN109945847A (en) * 2019-03-20 2019-06-28 武汉建工集团股份有限公司 A kind of metope monitoring method and system based on frame for line marking instrument
CN110132114A (en) * 2019-06-06 2019-08-16 上海中测行工程检测咨询有限公司 Body structure surface measurement method of planeness and device
CN110340158A (en) * 2019-07-17 2019-10-18 首钢京唐钢铁联合有限责任公司 A kind of rolling mill lining plate slant detection method and detecting tool
CN110514152A (en) * 2018-05-21 2019-11-29 北京博清科技有限公司 Degree of plainness for wall surface detection method and system based on laser scanning
CN112964173A (en) * 2020-12-31 2021-06-15 四川和心亿科技有限公司 Structural member quality detection method

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CN202915907U (en) * 2012-12-05 2013-05-01 山东科技大学 Ceramic coating scraper flatness error measuring device
CN103217112A (en) * 2012-01-19 2013-07-24 昆山思拓机器有限公司 Single-point thickness measurement method of SMT screen plate
CN103335626A (en) * 2013-06-04 2013-10-02 上海交通大学 An optimization selecting method for flatness measuring by a three-coordinate measuring machine
CN103994746A (en) * 2014-05-12 2014-08-20 上海大学 Measuring point selecting method of three-coordinate measuring machine for measuring flatness
CN204694208U (en) * 2014-12-31 2015-10-07 中铁宝桥集团有限公司 Bridge steel structure three-dimensional measurement detection system
US20160320177A1 (en) * 2014-02-11 2016-11-03 Easy-Laser Ab Method and system for measuring geometric surface characteristics of a flange surface

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102506805A (en) * 2011-10-14 2012-06-20 华南理工大学 Multi-measuring-point planeness evaluation method based on support vector classification
CN103217112A (en) * 2012-01-19 2013-07-24 昆山思拓机器有限公司 Single-point thickness measurement method of SMT screen plate
CN202915907U (en) * 2012-12-05 2013-05-01 山东科技大学 Ceramic coating scraper flatness error measuring device
CN103335626A (en) * 2013-06-04 2013-10-02 上海交通大学 An optimization selecting method for flatness measuring by a three-coordinate measuring machine
US20160320177A1 (en) * 2014-02-11 2016-11-03 Easy-Laser Ab Method and system for measuring geometric surface characteristics of a flange surface
CN103994746A (en) * 2014-05-12 2014-08-20 上海大学 Measuring point selecting method of three-coordinate measuring machine for measuring flatness
CN204694208U (en) * 2014-12-31 2015-10-07 中铁宝桥集团有限公司 Bridge steel structure three-dimensional measurement detection system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107270862A (en) * 2017-07-14 2017-10-20 杭州星帅尔电器股份有限公司 The detection method of heating wire flatness in Miniature heat protector
CN107270862B (en) * 2017-07-14 2019-04-30 杭州星帅尔电器股份有限公司 The detection method of heating wire flatness in Miniature heat protector
CN107424149A (en) * 2017-07-20 2017-12-01 晓视自动化科技(上海)有限公司 The module measurement method of planeness and equipment of view-based access control model technology
CN108225212A (en) * 2018-01-04 2018-06-29 苏州逸美德科技有限公司 Bend glass profile tolerance detection method
CN108225212B (en) * 2018-01-04 2020-07-14 逸美德科技股份有限公司 Method for detecting profile tolerance of curved glass
CN110514152A (en) * 2018-05-21 2019-11-29 北京博清科技有限公司 Degree of plainness for wall surface detection method and system based on laser scanning
CN109945847A (en) * 2019-03-20 2019-06-28 武汉建工集团股份有限公司 A kind of metope monitoring method and system based on frame for line marking instrument
CN110132114A (en) * 2019-06-06 2019-08-16 上海中测行工程检测咨询有限公司 Body structure surface measurement method of planeness and device
CN110340158A (en) * 2019-07-17 2019-10-18 首钢京唐钢铁联合有限责任公司 A kind of rolling mill lining plate slant detection method and detecting tool
CN112964173A (en) * 2020-12-31 2021-06-15 四川和心亿科技有限公司 Structural member quality detection method

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