CN104807403A - Driving light measuring rod for size measurement of large workpiece - Google Patents
Driving light measuring rod for size measurement of large workpiece Download PDFInfo
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- CN104807403A CN104807403A CN201510194668.9A CN201510194668A CN104807403A CN 104807403 A CN104807403 A CN 104807403A CN 201510194668 A CN201510194668 A CN 201510194668A CN 104807403 A CN104807403 A CN 104807403A
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- measuring rod
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Abstract
The invention relates to a driving light measuring rod for size measurement of a large workpiece. The driving light measuring rod for size measurement of the large workpiece comprises a wireless switch control box, a measuring rod body, a sleeking plate, diffusion plates, a measuring head, a cover plate, a power switch, a luminance adjusting knob and a lamp bead circuit board, wherein the wireless switch control box is installed in a control box groove formed in the front portion of the measuring rod body, the measuring head is in threaded connection with the tail portion of the measuring rod body, the diffusion plates are installed in diffusion plate grooves of the measuring rod body, the sleeking plate covers the diffusion plates to fix the diffusion plates, and the sleeking plate is fixed to the measuring rod body through screws; the lamp bead circuit board is fixedly arranged in an aluminum substrate groove of the measuring rod body through screws, the power switch and the luminance adjusting knob are fixed to the cover plate, and the cover plate is fixed to the measuring rod body through screws. Compared with an articulated arm type three-coordinate measuring machine and a return light reflecting type handheld measuring head visual measuring system, the driving light measuring rod has the advantages that the measuring range is large, the resistance to the ambient light interference is high, and feature point recognition is convenient.
Description
Technical field
The present invention relates to field of optical measurements, be specifically related to a kind of active flash ranging for large-scale workpiece dimensional measurement rod.
Background technology
Manufacturing industry is one of mainstay industry of the national economic development, and the measurement technology such as space orientation, dimensional measurement is then the necessary condition of machinery manufacturing industry development.Along with the development of Aero-Space, boats and ships, metallurgy, automobile making, harbour machinery, wind power equipment, equipment heavy-duty, integrated trend are more and more obvious.In the manufacture and assembling process of Large-Scale Equipment, the precision measure how realizing large-scale workpiece physical dimension and locus is the key factor ensureing equipment set quality.In large-scale metrology field, existing precision measurement method and equipment oneself effectively can not solve practical problems in engineer applied.The bottleneck of large-scale metrology field development calls new measuring technique.In the last few years, due to developing rapidly of the technology such as laser, semiconductor, automatically control, computing machine, precision manufactureing, there is multiple brand-new space large-scale metrology technology, three classes can be summarized as: articulated arm three coordinate measuring machine, laser space tracking measurement instrument, hand-held gauge head vision measurement system.
Above three kinds of instruments can realize the measurement to large-scale part, but all there is certain deficiency: the measurement space of articulated arm three coordinate measuring machine is subject to the restriction of joint arm, and measuring distance is quite limited, and it is larger to take up room, and is inconvenient to carry; Although laser space tracker has that measuring speed is fast, measuring accuracy is high and the advantage such as measurement range is large, but laser tracker acquisition expenses is high, core technology is monopolized by foreign company, be difficult at present realize production domesticization, only there are large-scale transnational manufacturing enterprise of several family and prominent domestic research institution in use, belong to high-acruracy survey equipment.Namely hand-held gauge head vision measurement system surveys excellent measuring system, it is a kind of measuring equipment that can meet the large scale space measurement demand that general precision requires, it is because price material benefit, the feature such as easy to use obtains domestic medium-sized and small enterprises and more and more pays close attention to and use, but the survey rod that market is used is now all that light echo is reflective, this survey rod is owing to being reflected light, light intensity process loss is large, make the limited brightness presented in CCD, easily occur that unique point is incomplete, luminance shortage, the shortcomings such as brightness disproportionation, particularly in the occasion of the detection of the heavy parts having larger change to require operating distance, the performance of these shortcomings is particularly evident.In addition light echo reflection easily introduces site environment noise, particularly on-the-spot in machine work, there is the feature that minute surface radiation much can occur, such as bright and clean piece surface mirror-reflection, these noises extract to cooperation monumented point and bring very large difficulty and uncertainty, and this also seriously constrains the usable range surveying rod.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of active flash ranging for large-scale workpiece dimensional measurement rod.Survey rod can produce and has special characteristic, brightness uniformity, position and shape infrared active geometry light source accurately, its gauge head can accurate location survey point, and its wireless switching can trigger camera and carry out image acquisition.The feature pattern of vision-based detection is produced owing to have employed active light source, so it has larger visible angle and measurement range, survey the accurate extraction that excellent cooperation monumented point detection algorithm can realize active geometry illuminant characterization, the object of realization character dimensional measurement then.
For achieving the above object, present invention employs following technical scheme:
A kind of active flash ranging for large-scale workpiece dimensional measurement rod, comprise wireless switching control enclosure, survey excellent main body, smoothing plate, diffuser plate, gauge head, cover plate, power switch, brightness regulation knob, lamp pearl circuit board; Described wireless switching control enclosure be arranged on survey excellent body front part control enclosure groove on, described gauge head is threaded connection the afterbody surveying excellent main body, described diffuser plate be arranged on survey excellent main body diffusion board slot in, and be fixed thereon by described smoothing plate lid, smoothing plate is fixed by screws in be surveyed in excellent main body; Described lamp pearl circuit board is fixed by screws in the aluminium base board slot surveying excellent main body; Described power switch and brightness regulation knob are fixed on the cover board; Described cover plate is screwed in the excellent main body of survey.
Described wireless switching control enclosure is made up of control enclosure upper cover, wireless switching button, continuous shooting button, wireless switching circuit board, control enclosure lower cover, described wireless switching button, continuous shooting button and wireless switching circuit board are arranged on control enclosure by clearance fit and cover, and fix with control enclosure lower cover, control enclosure upper cover and control enclosure lower cover are screwed.
Described gauge head is made up of gauge head extension rod and chaining pin two parts, and described chaining pin and described gauge head extension rod are threaded connection.
Described chaining pin is made up of shank and survey ball two parts, described shank and the adhesion of survey ball high strength adhesive agent; Described survey ball should ensure to cause its physical dimension to change in Long-Time Service process because of wearing and tearing, so select the material with high rigidity and high-wearing feature to make, when described shank should ensure that the contact force of survey ball and surface of the work is 1.25N, the centre of sphere surveying ball departs from original center ultimate range and is no more than 0.005mm, so the material of high rigidity and high rigidity should be selected to make.
Described lamp pearl circuit board is made up of radiator aluminium base plate and lamp pearl, and described lamp pearl is welded on described radiator aluminium base plate according to the position of light trough; Described radiator aluminium base plate is printed on the circuit for all lamp pearls of parallel connection, and provides heat radiation, to ensure the serviceable life of lamp pearl for lamp pearl.
Described lamp pearl selects beam spread angle to be that the lamp pearl of 80 ° ~ 135 ° is to ensure that in unique point areal extent, polishing is even on diffuser plate.
Described smoothing plate is thin-wall construction, thickness is no more than 0.5mm, seven holes on smoothing plate are used to the size and the mutual alignment that ensure cooperation monumented point, so the relative position error between Kong Yukong should ensure that the precision than surveying rod measurement is high, adopt the mode of slow wire feeding to process these holes for this reason, simultaneously in order to ensure that the visible angle of cooperation monumented point to fall the chamfering of 60 degree at the outward flange of each circular hole, the size on the narrow limit of chamfering is consistent with thickness of slab.
Described diffuser plate selects the material with good light diffusion effect to make, enough even to ensure the brightness of geometry illuminant characterization.
The described geometry illuminant characterization surveying rod is: the combination of T-shaped seven point type cooperation monumented points, 3 horizontal lines, 5 ordinates also can be the combinations of T-shaped multipoint mode or cruciform multipoint mode.Each cooperation monumented point is circle feature, also can be polygon feature or circle and polygonal assemblage characteristic.This active light source as circle feature of described cooperation monumented point, the infrared light of light source used to be wave band be 850nm, thered is provided by described lamp pearl, also can be the monochromatic light of its all band, and the impact being carried out filtering environmental light by the band pass filter installing corresponding wave band before camera additional is to ensure that circle feature can present pure ellipse or circular image in the camera.The implementation procedure of its cardinal principle of the combination of described T-shaped seven point type cooperation monumented points is: the extraction → identification cooperation gauge point → cooperation gauge point sequence label surveying excellent cooperation monumented point.
The present invention is owing to taking above technical scheme, and it has the following advantages to compare those enumerated measuring methods above:
Because each cooperation monumented point is an initiatively geometry light source, the impact that the factors such as far measuring distance is near cause luminance transformation is not vulnerable to, the problem that the Luminance Distribution accuracy of detection that there will not be the supersaturation of brightness or brightness too secretly to cause declines relative to Luminance Distribution information shape facility.
Each active geometry light source is by infrared light supply, and optical diffuser part, geometry unthreaded hole forms.The shape facility that the information of cooperation monumented point changes geometry unthreaded hole into by traditional light-source brightness distributed intelligence determines.Geometry unthreaded hole is high precision workpiece, obtains its profile information by high-precision checkout equipment.Optical diffuser part ensure that the homogeneity of geometry light-source brightness, increases field of view angle.Infrared light supply has narrow-band characteristic, there is bigger difference, coordinate corresponding band pass filter with industry spot light source frequency spectrum, eliminates the impact of surround lighting and field scene light well.
The T-shaped distribution of cooperation monumented point, provides plane major and minor axis (z, y-axis) directional information and azimuth information, facilitates the identification work of surveying excellent gauge point.
Accompanying drawing explanation
Fig. 1 is survey bar structure schematic perspective view of the present invention.
Fig. 2 is survey bar structure of the present invention composition schematic diagram.
Fig. 3 is the excellent agent structure schematic diagram of survey of the present invention.
Fig. 4 is wireless switching control enclosure structure of the present invention composition schematic diagram.
Fig. 5 is measuring head structure of the present invention composition schematic diagram.
Fig. 6 is lamp pearl circuit board of the present invention composition schematic diagram.
Fig. 7 is chaining pin structural representation of the present invention.
Fig. 8 is survey of the present invention excellent cooperation monumented point arrangement (T-shaped seven point types) schematic diagram.
Fig. 9 is survey of the present invention excellent cooperation monumented point testing process schematic diagram.
Figure 10 is that survey of the present invention rod uses schematic diagram.
Figure 11 is the excellent imaging effect figure of survey of the present invention and mark result schematic diagram.
Figure 12 is survey of the present invention excellent cooperation mark null circle characteristic imaging details effect schematic diagram.
Embodiment
Following examples will the present invention is further illustrated by reference to the accompanying drawings.
See Fig. 1, Fig. 2 and Fig. 3, a kind of active flash ranging for large-scale workpiece dimensional measurement rod, is characterized in that: comprise wireless switching control enclosure 2, survey excellent main body 3, smoothing plate 4, diffuser plate 5, gauge head 6, cover plate 7, power switch 8, brightness regulation knob 9, lamp pearl circuit board 10; Described wireless switching control enclosure 2 be arranged on survey excellent main body 3 front portion control enclosure groove 13 on, described gauge head 6 is threaded connection the afterbody surveying excellent main body 3, described diffuser plate 5 be arranged on survey excellent main body 3 diffusion board slot 11 in, and covered by described smoothing plate 4 and be fixed thereon, smoothing plate 4 is fixed by screws in be surveyed in excellent main body 3; Described lamp pearl circuit board 10 is fixed by screws in the aluminium base board slot 14 surveying excellent main body 3; Described power switch 8 and brightness regulation knob 9 are fixed on cover plate 7; Described cover plate 7 is screwed in the excellent main body 3 of survey.
See Fig. 4, described wireless switching control enclosure 2 is made up of control enclosure upper cover 17, wireless switching button 18, continuous shooting button 19, wireless switching circuit board 20, control enclosure lower cover 21, described wireless switching button 18, continuous shooting button 19 and wireless switching circuit board 20 are arranged on control enclosure upper cover 17 by clearance fit, and fix with control enclosure lower cover 21, control enclosure upper cover 17 and control enclosure lower cover 21 are screwed.
See Fig. 5, described gauge head 6 is made up of gauge head extension rod 22 and chaining pin 23 two parts, and described chaining pin 23 is threaded connection with described gauge head extension rod 22.
See Fig. 6, described lamp pearl circuit board 10 is made up of radiator aluminium base plate 24 and lamp pearl 25, and described lamp pearl 25 is welded on described radiator aluminium base plate 24 according to the position of light trough 12; Described radiator aluminium base plate 24 is printed on the circuit for all lamp pearls 25 of parallel connection, and provides heat radiation, to ensure the serviceable life of lamp pearl 25 for lamp pearl 25.
See Fig. 7, described chaining pin 23 is made up of shank 26 and survey ball 27 two parts, described shank 26 and the high strength adhesive agent adhesion of survey ball 27; Described survey ball 27 should ensure to cause its physical dimension to change in Long-Time Service process because of wearing and tearing, so select the material with high rigidity and high-wearing feature to make such as ruby, when described shank 26 should ensure that surveying ball 27 is 1.25N with the contact force of surface of the work, the centre of sphere surveying ball 27 departs from original center ultimate range and is no more than 0.005mm, so the material of high rigidity and high rigidity should be selected to make such as tungsten carbide.
Use procedure of the present invention and principle as follows:
See Fig. 8, the geometry illuminant characterization of described survey rod 1 is: the combination of T-shaped seven point type cooperation monumented points, 3 horizontal lines, and 5 ordinates also can be the combinations of T-shaped multipoint mode or cruciform multipoint mode.Each cooperation monumented point is circle feature, also can be polygon feature or circle and polygonal assemblage characteristic.This active light source as circle feature of described cooperation monumented point, the infrared light of light source used to be wave band be 850nm, thered is provided by described lamp pearl 25, also can be the monochromatic light of its all band, and the impact being carried out filtering environmental light by the band pass filter installing corresponding wave band before camera 29 additional is to ensure that circle feature can present pure ellipse or circular image in camera 29.
See Fig. 9, identify survey excellent cooperation monumented point method and step as follows:
(1) extraction of the upper cooperation identification point of rod is surveyed.
Camera 29 after rod carries out image acquisition to survey, first carries out pre-service to image, which includes filtering operation, to remove discrete noise point in image and self-adaption binaryzation process; Then Morphological scale-space is carried out, to obtain more regular ellipse light spot.Secondly, utilize canny operator to carry out rim detection to image and ellipse fitting operation is carried out to the marginal point extracted, thus the center image coordinate of target can be extracted.
(2) the cooperation identification point identification on the upper major axis of rod and minor axis is surveyed.
In the T-shaped feature on the survey rod 1 that the present invention proposes, the cooperation identification point number on major axis is more than the cooperation identification point number on minor axis.Therefore, according to the cooperation identification point information obtained, appoint and get two cooperation identification points and try to achieve straight line, if in remaining cooperation identification point, the cooperation identification point number being less than a certain threshold value to the distance of this straight line is greater than a definite value (this value can be taken between cooperation identification point number on major axis and the cooperation identification point number on minor axis), can think that cooperation identification point that the distance of this straight line is less than a certain threshold value is the cooperation identification point on major axis.Otherwise, appoint and get two cooperation identification points and try to achieve straight line, if in remaining cooperation identification point, the cooperation identification point number being less than a certain threshold value to the distance of this straight line is less than a definite value (this value can be taken between cooperation identification point number on major axis and the cooperation identification point number on minor axis), can think that cooperation identification point that the distance of this straight line is less than a certain threshold value is the cooperation identification point on minor axis.
(3) the cooperation identification point sequence on the upper major axis of rod and minor axis is surveyed.See Fig. 8, assuming that be positioned at the cooperation monumented point a on T-shaped feature intersection point, the cooperation monumented point on residue major axis, according to the distance with cooperation monumented point a, ascending, be defined as cooperation monumented point b, cooperation monumented point c, cooperation monumented point d, cooperation monumented point e respectively.On minor axis, the cooperation monumented point on the cooperation monumented point a left side is cooperation monumented point f, and the right is then cooperation monumented point g.
First, the cooperation monumented point on major axis is fitted to straight line, try to achieve the intersection point point (i.e. the right-angled intersection point of T-shaped feature) of T-shaped feature according to the cooperation monumented point on minor axis.Secondly, according to the vector direction that the cooperation monumented point on minor axis and intersection point point are tried to achieve, this vector direction and long axis direction multiplication cross are be just cooperation monumented point f, if multiplication cross value is negative, are cooperation monumented point g.Finally try to achieve the distance of the unique point on major axis to intersection point point respectively, ascending, be respectively cooperation monumented point b, cooperation monumented point c, cooperation monumented point d, cooperation monumented point e.
It is the use signal of surveying rod 1 measurement part length see Figure 10, as long as will excellent survey ball 27 and two end contacts of part be surveyed respectively, the wireless switching button 18 simultaneously pressed on it triggers camera 29 and takes pictures, obtained image is processed to the position of extracting gauge head center respectively in computing machine 28, then calculate the length of part.
See Figure 11, for this survey rod 1 imaging effect in actual use, the imaging effect of cooperation monumented point is in actual use good: circle feature is accurate, and restrained effectively on-the-spot ground unrest, be easy to the work for the treatment of just can carrying out picture, obtain the numbering of the point of the cooperation monumented point surveyed on rod 1.Wherein (a) surveys rod 1 at the front imaging effect from camera 29 half meters of, and (b) surveys rod 1 to rotate the imaging effect after 60 ° relative to camera 29, and (c) surveys the imaging effect of rod 1 from camera 29 2.5m place.
See Figure 12, the round characteristic imaging details effect of the cooperation monumented point of this survey rod 1, survey rod 1 in actual use cooperation monumented point still can present oval very accurately when relative camera 24 has the drift angle of larger angle.
Claims (8)
1. the active flash ranging for large-scale workpiece dimensional measurement rod, is characterized in that: comprise wireless switching control enclosure (2), survey excellent main body (3), smoothing plate (4), diffuser plate (5), gauge head (6), cover plate (7), power switch (8), brightness regulation knob (9), lamp pearl circuit board (10); Described wireless switching control enclosure (2) is arranged on surveys on the anterior control enclosure groove (13) of excellent main body (3), described gauge head (6) is threaded connection the afterbody surveying excellent main body (3), described diffuser plate (5) is arranged in the diffusion board slot (11) of the excellent main body of survey (3), and be fixed thereon by described smoothing plate (4) lid, smoothing plate (4) is fixed by screws in be surveyed in excellent main body (3); Described lamp pearl circuit board (10) is fixed by screws in the aluminium base board slot (14) surveying excellent main body (3); Described power switch (8) and brightness regulation knob (9) are fixed on cover plate (7); Described cover plate (7) is screwed in the excellent main body of survey (3).
2. the rod of the active flash ranging for large-scale workpiece dimensional measurement according to claim 1, it is characterized in that: described wireless switching control enclosure (2) is by control enclosure upper cover (17), wireless switching button (18), continuous shooting button (19), wireless switching circuit board (20), control enclosure lower cover (21) forms, described wireless switching button (18), continuous shooting button (19) and wireless switching circuit board (20) are arranged on control enclosure upper cover (17) by clearance fit, and fix with control enclosure lower cover (21), control enclosure upper cover (17) and control enclosure lower cover (21) are screwed.
3. the rod of the active flash ranging for large-scale workpiece dimensional measurement according to claim 1, it is characterized in that: described gauge head (6) is made up of gauge head extension rod (22) and chaining pin (23) two parts, described chaining pin (23) and described gauge head extension rod (22) are threaded connection.
4. the rod of the active flash ranging for large-scale workpiece dimensional measurement according to claim 3, it is characterized in that: described chaining pin (23) is made up of shank (26) and survey ball (27) two parts, described shank (26) and survey ball (27) high strength adhesive agent adhesion; Described survey ball (27) should ensure to cause its physical dimension to change in Long-Time Service process because of wearing and tearing, so select the material with high rigidity and high-wearing feature to make, when described shank (26) should ensure that surveying ball (27) is 1.25N with the contact force of surface of the work, the centre of sphere surveying ball (27) departs from original center ultimate range and is no more than 0.005mm, so the material of high rigidity and high rigidity should be selected to make.
5. the rod of the active flash ranging for large-scale workpiece dimensional measurement according to claim 1, it is characterized in that: described lamp pearl circuit board (10) is made up of radiator aluminium base plate (24) and lamp pearl (25), described lamp pearl (25) is welded on described radiator aluminium base plate (24) according to the position of light trough (12); Described radiator aluminium base plate (24) is printed on the circuit for all lamp pearls (25) of parallel connection, and provides heat radiation for lamp pearl (25), to ensure the serviceable life of lamp pearl (25).
6. the rod of the active flash ranging for large-scale workpiece dimensional measurement according to claim 5, is characterized in that: described lamp pearl (25) selects beam spread angle to be that the lamp pearl of 80 ° ~ 135 ° is to ensure that polishing is even in the upper unique point areal extent of diffuser plate (5).
7. the rod of the active flash ranging for large-scale workpiece dimensional measurement according to claim 1, it is characterized in that: described smoothing plate (4) is thin-wall construction, thickness is no more than 0.5mm, seven holes on smoothing plate (4) are used to the size and the mutual alignment that ensure cooperation monumented point, so the relative position error between Kong Yukong should ensure that the precision than surveying rod measurement is high, adopt the mode of slow wire feeding to process these holes for this reason, simultaneously in order to ensure that the visible angle of cooperation monumented point to fall the chamfering of 60 degree at the outward flange of each circular hole, the size on the narrow limit of chamfering is consistent with thickness of slab.
8. the rod of the active flash ranging for large-scale workpiece dimensional measurement according to claim 1, is characterized in that: described diffuser plate (5) selects the material with good light diffusion effect to make, enough even to ensure the brightness of geometry illuminant characterization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510194668.9A CN104807403A (en) | 2015-04-23 | 2015-04-23 | Driving light measuring rod for size measurement of large workpiece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510194668.9A CN104807403A (en) | 2015-04-23 | 2015-04-23 | Driving light measuring rod for size measurement of large workpiece |
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| CN104807403A true CN104807403A (en) | 2015-07-29 |
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| CN201510194668.9A Pending CN104807403A (en) | 2015-04-23 | 2015-04-23 | Driving light measuring rod for size measurement of large workpiece |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106595483A (en) * | 2016-12-19 | 2017-04-26 | 华中科技大学无锡研究院 | Active light hand-held target and cooperation mark point identification method thereof |
| CN108981564A (en) * | 2018-04-25 | 2018-12-11 | 上海大学 | A kind of light pen vision target based on active principle of luminosity |
| CN111829461A (en) * | 2020-07-23 | 2020-10-27 | 菲烁易维(重庆)科技有限公司 | Positioning target, vision measurement system and method for acquiring flatness |
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| CN111829461A (en) * | 2020-07-23 | 2020-10-27 | 菲烁易维(重庆)科技有限公司 | Positioning target, vision measurement system and method for acquiring flatness |
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