CN104197837A - Non-contact type optical measuring method and device for measuring volume of objects with complicated surfaces - Google Patents
Non-contact type optical measuring method and device for measuring volume of objects with complicated surfaces Download PDFInfo
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- CN104197837A CN104197837A CN201410480881.1A CN201410480881A CN104197837A CN 104197837 A CN104197837 A CN 104197837A CN 201410480881 A CN201410480881 A CN 201410480881A CN 104197837 A CN104197837 A CN 104197837A
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Abstract
The invention relates to a non-contact type optical measuring method and device for measuring volume of objects with complicated surfaces. The non-contact type optical measuring device comprises a miniature projector with a depending projection lens, a first double-side telecentric lens used for projecting annular structure light is arranged right below the miniature projector, a rotary stage for disposing complicated objects to be measured is arranged right below the first double-side telecentric lens, a second double-side telecentric lens is arranged beside the rotary stage, and a CCD (charge coupled device) camera is arranged beside the second double-side telecentric lens and on a focal plane of the second double-side telecentric lens. A step of three-dimension reconstruction before volume measurement is omitted, so that higher accuracy is achieved; diffuse reflection is measured, complicated surfaces of the objects like plasticene can be measured; and a reliable technical device and method is provided for measuring volume of non-contact type accurate objects.
Description
Technical field
The present invention relates to a kind of non-contact optical measuring method and device of complex surface object volume.
Background technology
Optical three-dimensional measurement technology is to integrate light, mechanical, electrical and intellectuality, visual new and high technology computer technology, be mainly used in object space profile and structure to scan, to obtain the three-D profile of object, obtain the three dimensional space coordinate of body surface point.Traditional non-contact optical three-dimensional measurement technology mainly contains three kinds of time-of-flight method, interferometric method and trigonometries.
Time-of-flight method is time-modulation structure light beam being produced based on 3 d shape, the general laser that adopts, flight time by measurement light wave obtains range information, in conjunction with additional scanister, makes the whole object to be measured of light pulse scanning just can obtain three-dimensional data.Time-of-flight method exchanges range measurement accuracy for the temporal resolution to input, obtain high measuring accuracy, and measuring system must have high temporal resolution, is usually used in large scale and measures at a distance.
Interferometric method is that a branch of coherent light is divided into and is measured light and reference light by beam splitting system, utilizes the coherence stack of measuring light wave and reference light wave to determine the phase differential between two-beam, thereby obtains the depth information of body surface.This method measuring accuracy is high, but measurement range is subject to the restriction of optical wavelength, can only measure pattern and the micro-displacement of microcosmic surface, is unsuitable for the detection of large scale object.
Optical triangulation method is a kind of optical three-dimensional measurement technology of relatively commonly using, take traditional triangulation as basis, the depth information of this point of angle change calculations producing with respect to optical reference line skew by tested point.According to the difference of concrete lighting system, optical triangulation method can be divided into two large classes: passive trigonometry and the active trigonometry based on structured light.Binocular vision is typical passive three-dimensional measurement technology, its advantage is its strong adaptability, can under multiple condition, measure neatly the steric information of object, shortcoming is to need a large amount of relevant matches computings and the problems such as calibration of complicated Space geometric parameter comparatively, measuring accuracy is low, and calculated amount is larger, is unsuitable for delicate metering, be usually used in the occasions such as identification, understanding and position conformal analysis of objective, more in aviation field application.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of non-contact optical measuring method and device of complex surface object volume, not only measurement is reliable, precision is high, and measuring object is wider.
To achieve these goals, technical scheme one of the present invention is: a kind of non-contact optical measurement mechanism of complex surface object volume, comprise projection lens micro projector vertically downward, under described micro projector, be provided with for projecting the first bilateral telecentric lens of ring texture light, under described the first bilateral telecentric lens, be provided with for placing the rotatable stage of complex object to be measured, the side of described rotatable stage is provided with the second bilateral telecentric lens, and the side of described the second bilateral telecentric lens is provided with the ccd video camera being positioned on its focal plane.
Further, below described rotatable stage, be fixed with the rotation control panel of controlling its anglec of rotation for precision, the circumference of described rotation control panel is evenly distributed with a plurality of light holes, the side of described rotation control panel is also provided with transmission-type optocoupler sensor, and the transmitting terminal of described transmission-type optocoupler sensor and receiving end symmetry are positioned at the upper and lower of rotation control panel to face a light hole.
Further, described rotation control panel is square, in the middle of its four edge parts, offers respectively light hole.
Further, described rotation control panel is fixed on bracing frame to support rotatable stage.
Further, described micro projector is fixed on support.
To achieve these goals, technical scheme two of the present invention is: a kind of non-contact optical measuring method of complex surface object volume, adopt non-contact optical measurement mechanism as above, complex object to be measured be positioned on rotatable stage, and carry out according to the following steps:
(1) utilize micro projector projection to there is equally spaced black and white ring texture light, parallel shining on complex object to be measured after the first bilateral telecentric lens, the ring texture light of outgoing is because the irregular modulation on complex object surface produces superficial makings;
(2) utilize ccd video camera, texture image complex object surface being produced by the second bilateral telecentric lens absorbs;
(3) picture of picked-up is carried out to analyzing and processing, utilize the partial volume of the volume algorithm routine calculation of complex object that computing machine writes;
(4) rotate rotatable stage, turn over 360/n degree at every turn;
(5) repeat the measurement of n-1 step (2), (3), (4), until rotatable stage just rotates a circle;
(6) resulting n partial volume is carried out to aftertreatment, try to achieve complex object volume.
Further, in step (3), because absorbed picture is half of complex object sectional area, therefore it is carried out utilizing volume integral algorithm to obtain a part of volume after binaryzation and rim detection.
Further, in step (4), utilize transmission-type optocoupler sensor accurately to control the anglec of rotation of rotatable stage.
Further, below rotatable stage, fix the rotation control panel that a circumference is evenly distributed with n light hole, at the upper and lower of rotation control panel, be symmetrical arranged the transmitting terminal of transmission-type optocoupler sensor and receiving end to face a light hole, when light hole has light signal output, just can accurately control the angle at every turn turning over.
Further, in step (6), described aftertreatment is divided by n/2 after summation.
Compared with prior art, the present invention has the following advantages: the design feature that this device has certain volume to measure before breaking through, proposed innovatively to project black and white equidistant projection loop configuration light by bilateral telecentric lens, the depth of parallelism is high, image sharpness is high, and projector and video camera form orthogonal light path, by manual or electric rotary rotatable stage, coordinates loop configuration light, before breaking through previous cubing, do this step of three-dimensionalreconstruction, with this, reach higher precision; This device not only can be measured diffuse reflection, and can measure the surface such as the complex object that is similar to plasticine; For obtaining the measurement of contactless accurate object volume, a kind of reliable technique device and method are provided.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is the sectional view of ring texture light.
Fig. 3 is the coordinate figure of rotation control panel with transmission-type optocoupler sensor.
Fig. 4 is the vertical view of rotation control panel.
In figure: 1-micro projector, 2-the first bilateral telecentric lens, 3-ring texture light, 4-complex object to be measured, 5-rotatable stage, 6-rotates control panel, 61-light hole, 7-transmission-type optocoupler sensor, 71-transmitting terminal, 72-receiving end, 8-bracing frame, 9-the second bilateral telecentric lens, 10-CCD video camera.
Embodiment
As shown in Figure 1 and 2, a kind of non-contact optical measurement mechanism of complex surface object volume, comprise projection lens micro projector 1 vertically downward, under described micro projector 1, be provided with for projecting the first bilateral telecentric lens 2 of ring texture light 3, under described the first bilateral telecentric lens 2, be provided with for placing the rotatable stage 5 of complex object 4 to be measured, the side of described rotatable stage 5 is provided with the second bilateral telecentric lens 9, and the side of described the second bilateral telecentric lens 9 is provided with the ccd video camera 10 being positioned on its focal plane.
In the present embodiment, described rotatable stage 5 be below fixed with the rotation control panel 6 of controlling its anglec of rotation for precision, the circumference of described rotation control panel 6 is evenly distributed with a plurality of light holes 61; As shown in Figure 3, the side of described rotation control panel 6 is also provided with transmission-type optocoupler sensor 7, and the transmitting terminal 71(of described transmission-type optocoupler sensor 7 is generating laser) and receiving end 72(be laser pickoff) symmetry be positioned at rotation control panel 6 upper and lower to face a light hole 61.
In the present embodiment, as shown in Fig. 3 ~ 4, described rotation control panel 6 is square, in the middle of its four edge parts, offers respectively light hole 61, rotates control panel 6 edge parts and is uniformly distributed 4 light holes 61, but be not limited to this.Described micro projector 1 is fixed on support, and described rotation control panel 6 is fixed on bracing frame 8 to support rotatable stage 5, by rotating support 8, is rotatable rotatable stage 5.
As shown in Fig. 1 ~ 4, a kind of non-contact optical measuring method of complex surface object volume, adopts non-contact optical measurement mechanism as above, complex object 4 to be measured is positioned on rotatable stage 5, and carries out according to the following steps:
(1) utilize micro projector 1 projection to there is equally spaced black and white ring texture light 3, parallel shining on complex object 4 to be measured after the first bilateral telecentric lens 2, the ring texture light 3 of outgoing is because the irregular modulation on complex object surface produces superficial makings;
(2) utilize ccd video camera 10, the texture image producing by 9 pairs of complex object surfaces of the second bilateral telecentric lens absorbs;
(3) picture of picked-up is carried out to analyzing and processing, utilize the partial volume of the volume algorithm routine calculation of complex object that computing machine writes;
(4) rotate rotatable stage 5, turn over 360/n degree at every turn;
(5) repeat the measurement of n-1 step (2), (3), (4), until rotatable stage 5 just rotates a circle;
(6) resulting n partial volume is carried out to aftertreatment, try to achieve complex object volume.
In step (3), because absorbed picture is half of complex object sectional area, therefore it is carried out utilizing existing volume integral algorithm to obtain a part of volume after binaryzation and rim detection.
In step (4), can utilize the anglec of rotation of 7 pairs of rotatable stages 5 of transmission-type optocoupler sensor accurately to control, specifically: below rotatable stage 5, fix the rotation control panel 6 that a circumference is evenly distributed with n light hole 61, at the upper and lower of rotation control panel 6, be symmetrical arranged the transmitting terminal 71 of transmission-type optocoupler sensor 7 and receiving end 72 to face a light hole 61, when light hole 61 has light signal output, just can accurately control the angle at every turn turning over.
In step (6), described aftertreatment is divided by n/2 after summation.
In the present embodiment, in step (4), turn over 90 degree at every turn, in step (5), repeat the measurement of three steps (2), (3), (4), in step (6), resulting four partial volumes are carried out to aftertreatment, summation after divided by two.Certainly, the value of n is not limited to this, can also get the integers such as 3,5 ~ 8.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. the non-contact optical measurement mechanism of a complex surface object volume, it is characterized in that: comprise projection lens micro projector vertically downward, under described micro projector, be provided with for projecting the first bilateral telecentric lens of ring texture light, under described the first bilateral telecentric lens, be provided with for placing the rotatable stage of complex object to be measured, the side of described rotatable stage is provided with the second bilateral telecentric lens, and the side of described the second bilateral telecentric lens is provided with the ccd video camera being positioned on its focal plane.
2. the non-contact optical measurement mechanism of complex surface object volume according to claim 1, it is characterized in that: below described rotatable stage, be fixed with the rotation control panel of controlling its anglec of rotation for precision, the circumference of described rotation control panel is evenly distributed with a plurality of light holes, the side of described rotation control panel is also provided with transmission-type optocoupler sensor, and the transmitting terminal of described transmission-type optocoupler sensor and receiving end symmetry are positioned at the upper and lower of rotation control panel to face a light hole.
3. the non-contact optical measurement mechanism of complex surface object volume according to claim 2, is characterized in that: described rotation control panel is square, in the middle of its four edge parts, offers respectively light hole.
4. the non-contact optical measurement mechanism of complex surface object volume according to claim 1, is characterized in that: described rotation control panel is fixed on bracing frame to support rotatable stage.
5. the non-contact optical measurement mechanism of complex surface object volume according to claim 1, is characterized in that: described micro projector is fixed on support.
6. a non-contact optical measuring method for complex surface object volume, is characterized in that: adopt non-contact optical measurement mechanism claimed in claim 1, complex object to be measured is positioned on rotatable stage, and carry out according to the following steps:
(1) utilize micro projector projection to there is equally spaced black and white ring texture light, parallel shining on complex object to be measured after the first bilateral telecentric lens, the ring texture light of outgoing is because the irregular modulation on complex object surface produces superficial makings;
(2) utilize ccd video camera, texture image complex object surface being produced by the second bilateral telecentric lens absorbs;
(3) picture of picked-up is carried out to analyzing and processing, utilize the partial volume of the volume algorithm routine calculation of complex object that computing machine writes;
(4) rotate rotatable stage, turn over 360/n degree at every turn;
(5) repeat the measurement of n-1 step (2), (3), (4), until rotatable stage just rotates a circle;
(6) resulting n partial volume is carried out to aftertreatment, try to achieve complex object volume.
7. the non-contact optical measuring method of complex surface object volume according to claim 6, it is characterized in that: in step (3), because absorbed picture is half of complex object sectional area, therefore it is carried out utilizing volume integral algorithm to obtain a part of volume after binaryzation and rim detection.
8. the non-contact optical measuring method of complex surface object volume according to claim 6, is characterized in that: in step (4), utilize transmission-type optocoupler sensor accurately to control the anglec of rotation of rotatable stage.
9. the non-contact optical measuring method of complex surface object volume according to claim 8, it is characterized in that: below rotatable stage, fix the rotation control panel that a circumference is evenly distributed with n light hole, at the upper and lower of rotation control panel, be symmetrical arranged the transmitting terminal of transmission-type optocoupler sensor and receiving end to face a light hole, when light hole has light signal output, just can accurately control the angle at every turn turning over.
10. the non-contact optical measuring method of complex surface object volume according to claim 6, is characterized in that: in step (6), described aftertreatment is divided by n/2 after summation.
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Cited By (6)
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| CN104655015A (en) * | 2015-02-11 | 2015-05-27 | 苏州珂锐铁电气科技有限公司 | Apparatus for detecting and measuring tubular and wire materials |
| CN105890547A (en) * | 2016-06-03 | 2016-08-24 | 杭州汉振科技有限公司 | Three-dimensional profile measurement instrument |
| CN105953749A (en) * | 2016-06-21 | 2016-09-21 | 西安交通大学 | Optimal three-dimensional morphology measurement method |
| CN107621250A (en) * | 2017-11-06 | 2018-01-23 | 广州市建筑科学研究院有限公司 | A kind of roughness detecting method of concrete prefabricated element faying face |
| CN114295055A (en) * | 2021-12-31 | 2022-04-08 | 东莞市极末科技有限公司 | Device and method for measuring volume of object |
| US11578967B2 (en) | 2017-06-08 | 2023-02-14 | Onto Innovation Inc. | Wafer inspection system including a laser triangulation sensor |
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| KR102638769B1 (en) * | 2021-03-30 | 2024-02-20 | 주식회사 뷰온 | Optics apparatus For Inspecting Surface |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655015A (en) * | 2015-02-11 | 2015-05-27 | 苏州珂锐铁电气科技有限公司 | Apparatus for detecting and measuring tubular and wire materials |
| CN105890547A (en) * | 2016-06-03 | 2016-08-24 | 杭州汉振科技有限公司 | Three-dimensional profile measurement instrument |
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| US11578967B2 (en) | 2017-06-08 | 2023-02-14 | Onto Innovation Inc. | Wafer inspection system including a laser triangulation sensor |
| CN107621250A (en) * | 2017-11-06 | 2018-01-23 | 广州市建筑科学研究院有限公司 | A kind of roughness detecting method of concrete prefabricated element faying face |
| CN107621250B (en) * | 2017-11-06 | 2020-02-11 | 广州市建筑科学研究院有限公司 | Roughness detection method for concrete prefabricated part joint surface |
| CN114295055A (en) * | 2021-12-31 | 2022-04-08 | 东莞市极末科技有限公司 | Device and method for measuring volume of object |
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