CN101113894A - Frequency conversion shadow casting raster line three-dimensional shape measuring apparatus and measurement method thereof - Google Patents
Frequency conversion shadow casting raster line three-dimensional shape measuring apparatus and measurement method thereof Download PDFInfo
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- CN101113894A CN101113894A CNA2007100455952A CN200710045595A CN101113894A CN 101113894 A CN101113894 A CN 101113894A CN A2007100455952 A CNA2007100455952 A CN A2007100455952A CN 200710045595 A CN200710045595 A CN 200710045595A CN 101113894 A CN101113894 A CN 101113894A
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Abstract
The invention discloses a 3D figure measuring instrument and measurement method used for changing frequency projection grid lines, and is characterized in that the instrument includes a projective grid generation device and an image acquisition device; the projective grid generation device includes a computer and a digital projector connected with the computer; the image acquisition device is composed of an ordinal arrangement digital camera or CCD digital camera, a reference grating and an imaging lens, which are integrated in sequence into a whole, the digital camera or CCD digital camera is connected with the computer; the computer generates changing frequency projection physical grating to the digital projector, projects the grid lines to the surface of the measured object, and collects the image from the digital camera or CCD digital camera, generates the phase shift, calculates the results, then gets the contour value. As the high-power projection lamp is replaced by the digital projector, the physical grating in the prior art is replaced by the uniform grating generated by the computer, the frequency and the size of the projection grid can be regulated arbitrarily, the device is applicable to a wider range, and the measurement sensitivity and precision are improved.
Description
Technical field
The present invention relates to a kind of non-contact optical measuring instrument that is intended to structure three-dimensional topography measurement or defects detection, relate in particular to a kind of frequency conversion shadow casting raster line three-dimensional shape measuring apparatus and measuring method thereof.
Background technology
The three-dimensional appearance of early stage image moire Measuring Object commonly used, double frequency projection gate three-dimensional shape measuring apparatus as shown in Figure 1, it comprise one first grating 11, one second grating 12 ,-CCD 2 ,-high-power projection lamp 3 ,-image-forming objective lens 4 ,-accurate translation platform 6 and-computing machine 7.This measuring instrument is the physical grating 11 that (near testee 5) places a fixed railing pitch between testee and image capturing system, under the irradiation of projection lamp, be projected in grid line flexural deformation of measured object owing to the height fluctuating of testee surface configuration.By image acquisition and calculate the profile to differentiate measured object intuitively,, obtain actual three-dimensional dimension as checking symmetry, defects detection etc.This is very important for the engineering technical personnel that carry out modelling, on-the-spot test.But there is following shortcoming in this instrument:
1, require that the density (frequency) of two blocks of screens is different just can be measured, but generally moire grids density is fixed, so surface graded, the size of Measuring Object etc. all are restricted; Especially, if the measured object volume is bigger, it is big that the area of corresponding grid line is also wanted, and obviously limited the expansion of this method.
2, to the device of Fig. 1 if produce phase shift, must be to the accurate translation of measured object, thus obtain the phase shifting electronic speckle interference fringe pattern, solve digitized displacement again, such phase shift meeting produces error, makes measuring accuracy influenced.
Summary of the invention
The objective of the invention is to solve the versatility and the low problem of measuring accuracy of three-dimensional appearance digitized measurement, and a kind of frequency conversion shadow casting raster line three-dimensional shape measuring apparatus and the measuring method thereof that provide.This frequency conversion shadow casting raster line three-dimensional shape measuring apparatus all generally is suitable for the test specimen of different sizes, different light source irradiation directions with method, and the generation of phase shift is not by common mechanical adjustment or utilizes the mode of piezoelectric ceramics piezoelectric effect to produce, but the automatic generation by the computing machine precision.Obtain tremendous increase for characteristics such as the convenience of instrument, versatility, compactedness.
Technical scheme of the present invention is: frequency conversion shadow casting raster line three-dimensional shape measuring apparatus, be characterized in, and comprising: projective grid generation device and image collecting device; Described projective grid generation device comprises computing machine and the digital projection instrument that is connected with computing machine; Described image collecting device is by tactic digital camera or CCD digital camera head, form one with reference to grating, image-forming objective lens, and described digital camera or CCD digital camera head are connected with computing machine; Computing machine is responsible for producing frequency projection physical grating to the digital projection instrument, grid line is projected the measured object surface measures, and from digital camera or CCD digital camera head images acquired, produce phase shift, result of calculation obtains value of contour.
Above-mentioned frequency conversion shadow casting raster line three-dimensional shape measuring apparatus, wherein, the digital camera of described image collecting device or CCD digital camera head, with reference to the axle center of grating, image-forming objective lens on same axis.
Above-mentioned frequency conversion shadow casting raster line three-dimensional shape measuring apparatus wherein, also comprises one first support, and described projective grid generation device is arranged on described first support.
Above-mentioned frequency conversion shadow casting raster line three-dimensional shape measuring apparatus wherein, also comprises one second support, and described image collecting device is arranged on described second support.
Above-mentioned frequency conversion shadow casting raster line three-dimensional shape measuring apparatus, wherein, the area of the grating that is provided with in the described imaging system is more than or equal to the CCD target surface.
The measuring method of frequency conversion shadow casting raster line three-dimensional shape measuring apparatus is characterized in, may further comprise the steps:
A, preparation: measured object is placed on and image collecting device coaxial cable and the place in the aperture of the digital projection instrument of projective grid generation device;
B, begin to measure:
B1, the uniform grid line that computing machine is produced are input to projector, produce automatic phase shift projecting grating, by projector this grid line are projected the measured object surface;
B2, with the physical grating of placing between Digital Video or CCD camera and the image-forming objective lens be adjusted on demand grating can be on the CCD target surface imaging position clearly, this imaging overlaps on the CCD target surface with measured object Surface Physical grid;
B3, directly the image that obtains is input in the computing machine, obtains the value of contour of three-dimensional appearance by calculation by computer.
The measuring method of above-mentioned frequency conversion shadow casting raster line three-dimensional shape measuring apparatus wherein, describedly obtains three width of cloth images by CCD images acquired, computing machine phase-shifted grating the time, by Flame Image Process, obtains the pattern value of contour of three-dimensional body.
The measuring method of above-mentioned frequency conversion shadow casting raster line three-dimensional shape measuring apparatus, wherein, the area of the grating that is provided with in the described imaging system is more than or equal to the CCD target surface.
The present invention is owing to taked above technical scheme, and compared with prior art, the technique effect of its generation is tangible:
1. utilize computing machine to produce the external again projector of uniform grid line (the general physical grating all has the portrayal damage), grid line is projected the measured object surface, replaced the physics projection gate, not only the quality of grating (density uniformity, striped rectilinearity etc.) can guarantee, can also generate the grid line of different densities (frequency) by software automatically, make that measuring sensitivity can realize dynamic adjusting, converter technique that Here it is on a surveying instrument;
2. replaced the robotization control that traditional PZT realizes time-phase displacement by the automatic phase shift projecting grating of computing machine, thereby made that the result of striped digitizing output is more accurate;
3. place physical grating (reference grating) between Digital Video or CCD camera and the image-forming objective lens, its position need be adjusted to grating can on the CCD target surface, become a size to fit and clearly as, see Fig. 2, this picture overlaps on the CCD target surface with measured object Surface Physical grid, directly the image that obtains is input in the computing machine, obtains the value of contour of three-dimensional appearance by computed in software.
In a word, this system can be used for the in-situ profile inspection and the measurement of different component, and can obtain digitized result.
Description of drawings
Feature of the present invention, performance and advantage are further specified by following embodiment and accompanying drawing thereof.
Fig. 1 is the structural representation of double frequency shadow casting raster line three-dimensional detector for displacement measuring in the prior art.
Fig. 2 is the structural representation of frequency conversion shadow casting raster line three-dimensional detector for displacement measuring of the present invention.
Embodiment
See also Fig. 2, this is the structural representation of frequency conversion shadow casting raster line three-dimensional detector for displacement measuring of the present invention.Frequency conversion shadow casting raster line three-dimensional shape measuring apparatus of the present invention comprises projective grid generation device that is arranged on first support and the image collecting device that is arranged on second support; Described projective grid generation device comprises computing machine 21 and the digital projection instrument 22 that is connected with computing machine; Described image collecting device is by tactic digital camera or CCD digital camera head 31, form one with reference to grating 32, image-forming objective lens 33, and described digital camera or CCD digital camera head are connected with computing machine; Computing machine is responsible for producing frequency projection physical grating to the digital projection instrument, grid line is projected the measured object surface measures, and from digital camera or CCD digital camera head images acquired, produce phase shift, result of calculation obtains value of contour.The digital camera of described image collecting device or CCD digital camera head, with reference to the axle center of grating, image-forming objective lens on same axis.
In the frequency conversion shadow casting raster line three-dimensional shape measuring apparatus of the present invention, the area of the grating that is provided with in the described imaging system is more than or equal to the CCD target surface.As long as general grid line area is the same with the CCD target surface big, as long as the energy of projection lamp is enough, the area of Shu Nengli with regard to determining to measure expanded in projection.
During use, testee is fixed, regulated projector and be fixed on the tripod, regulate its centre-height, guarantee that projecting grating projects the surface of testee uniformly; Image-forming objective lens, be solidified into a cover system in proper order, and overall fixed is on another tripod, also will regulates height of center and imaging is clear with reference to grating, CCD, and images acquired, produce phase shift by computing machine, and finally calculate digitized result.
Computing machine produces chequered with black and white grating fringe and is projected by the digital projection instrument of plugging on it, is radiated on the testee; As long as this striped is carried out frequency change and phase change in computing machine be frequency conversion and phase shift respectively just, so this system is robotization, digitized frequency conversion shadow system fully.
The measuring method of frequency conversion shadow casting raster line three-dimensional shape measuring apparatus of the present invention may further comprise the steps:
A, preparation: measured object is placed on and image collecting device coaxial cable and the place in the aperture of the digital projection instrument of projective grid generation device;
B, begin to measure:
B1, the uniform grid line that computing machine is produced are input to projector, produce automatic phase shift projecting grating, by projector this grid line are projected the measured object surface;
B2, with the physical grating of placing between Digital Video or CCD camera and the image-forming objective lens be adjusted on demand grating can be on the CCD target surface imaging position clearly, this imaging overlaps on the CCD target surface with measured object Surface Physical grid;
B3, directly the image that obtains is input in the computing machine, obtains the value of contour of three-dimensional appearance by calculation by computer.Describedly obtain three width of cloth images by CCD images acquired, computing machine phase-shifted grating the time,, obtain the pattern value of contour of three-dimensional body by Flame Image Process.
The present invention utilizes the digital projection instrument to replace high-power projection lamp, the grating that computing machine produces directly can be incident upon on the testee by projector like this, can select the projector of different capacity for use for the Measuring Object of different sizes.Utilized computing machine to produce uniform grating and replaced wherein physical grating, make the frequency of projection gate, size all can regulate arbitrarily, thereby the scope of application has been wider; Adopt Digital Video or CCD camera directly the image that obtains to be input in the computing machine, thereby can carry out Digital Image Processing and analysis with image software; Not only projection grating can produce automatically, and phase shift also can be finished automatically by computing machine, does not need to be equipped with complicated accurate translation mechanism, and so theoretically phase shift does not have error, so the precision as a result that this method obtains is far above general projection gate collimation method; By being arranged in the CCD images acquired on the measuring instrument body, obtain three width of cloth images in the time of the computing machine phase-shifted grating, by Flame Image Process, obtain the pattern value of contour of three-dimensional body.Have very high sensitivity and degree of accuracy.Robotization and the full digitalization measured have been realized.
Claims (8)
1. frequency conversion shadow casting raster line three-dimensional shape measuring apparatus is characterized in that, comprising: projective grid generation device and image collecting device; Described projective grid generation device comprises computing machine and the digital projection instrument that is connected with computing machine; Described image collecting device is by tactic digital camera or CCD digital camera head, form one with reference to grating, image-forming objective lens, and described digital camera or CCD digital camera head are connected with computing machine; Computing machine is responsible for producing frequency projection physical grating to the digital projection instrument, grid line is projected the measured object surface measures, and from digital camera or CCD digital camera head images acquired, produce phase shift, result of calculation obtains value of contour.
2. frequency conversion shadow casting raster line three-dimensional shape measuring apparatus according to claim 1 is characterized in that, the digital camera of described image collecting device or CCD digital camera head, with reference to the axle center of grating, image-forming objective lens on same axis.
3. frequency conversion shadow casting raster line three-dimensional shape measuring apparatus according to claim 1 is characterized in that, also comprises one first support, and described projective grid generation device is arranged on described first support.
4. frequency conversion shadow casting raster line three-dimensional shape measuring apparatus according to claim 1 is characterized in that, also comprises one second support, and described image collecting device is arranged on described second support.
5. frequency conversion shadow casting raster line three-dimensional shape measuring apparatus according to claim 1 is characterized in that the area of the grating that is provided with in the described imaging system is more than or equal to the CCD target surface.
6. the measuring method of frequency conversion shadow casting raster line three-dimensional shape measuring apparatus is characterized in that, may further comprise the steps:
A, preparation: measured object is placed on and image collecting device coaxial cable and the place in the aperture of the digital projection instrument of projective grid generation device;
B, begin to measure:
B1, the uniform grid line that computing machine is produced are input to projector, produce automatic phase shift projecting grating, by projector this grid line are projected the measured object surface;
B2, with the physical grating of placing between Digital Video or CCD camera and the image-forming objective lens be adjusted on demand grating can be on the CCD target surface imaging position clearly, this imaging overlaps on the CCD target surface with measured object Surface Physical grid;
B3, directly the image that obtains is input in the computing machine, obtains the value of contour of three-dimensional appearance by calculation by computer.
7. the measuring method of frequency conversion shadow casting raster line three-dimensional shape measuring apparatus according to claim 6, it is characterized in that, describedly obtain three width of cloth images by CCD images acquired, computing machine phase-shifted grating the time,, obtain the pattern value of contour of three-dimensional body by Flame Image Process.
8. the measuring method of frequency conversion shadow casting raster line three-dimensional shape measuring apparatus according to claim 6 is characterized in that, the area of the grating that is provided with in the described imaging system is more than or equal to the CCD target surface.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100455952A CN101113894A (en) | 2007-09-05 | 2007-09-05 | Frequency conversion shadow casting raster line three-dimensional shape measuring apparatus and measurement method thereof |
| CNU200820133665XU CN201311277Y (en) | 2007-09-05 | 2008-09-04 | Variable-frequency projected grating line three-dimensional topography measuring instrument |
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| CNA2007100455952A CN101113894A (en) | 2007-09-05 | 2007-09-05 | Frequency conversion shadow casting raster line three-dimensional shape measuring apparatus and measurement method thereof |
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| CNA2007100455952A Pending CN101113894A (en) | 2007-09-05 | 2007-09-05 | Frequency conversion shadow casting raster line three-dimensional shape measuring apparatus and measurement method thereof |
| CNU200820133665XU Expired - Fee Related CN201311277Y (en) | 2007-09-05 | 2008-09-04 | Variable-frequency projected grating line three-dimensional topography measuring instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102768025A (en) * | 2012-07-19 | 2012-11-07 | 西安交通大学 | Multi-step variable frequency projected fringe measurement method for measuring each point on object independently |
| CN104089585A (en) * | 2014-07-28 | 2014-10-08 | 北京理工大学 | Macro-micro three-dimensional deformation measurement method based on single-width orthogonal grid lines |
| CN105486245A (en) * | 2015-11-19 | 2016-04-13 | 中国航空工业集团公司北京航空材料研究院 | Experimental device and method for measuring depression depth of composite material after impact |
| CN106840251A (en) * | 2015-12-07 | 2017-06-13 | 中国电力科学研究院 | A kind of 3 D scanning system for the detection of low-voltage current mutual inductor outward appearance |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101813462A (en) * | 2010-04-16 | 2010-08-25 | 天津理工大学 | Three-dimensional feature optical measuring system controlled by uniprocessor and measuring method |
| CN103712576B (en) * | 2013-12-20 | 2017-02-08 | 上海瑞立柯信息技术有限公司 | Programming-controlled grating projection device |
| CN111566438B (en) * | 2018-12-19 | 2022-03-25 | 合刃科技（深圳）有限公司 | Image acquisition method and system |
| CN114083459A (en) * | 2021-11-23 | 2022-02-25 | 中国航空工业集团公司洛阳电光设备研究所 | Device and method for adjusting consistency of despin mechanism CCD center and rotation center |
-
2007
- 2007-09-05 CN CNA2007100455952A patent/CN101113894A/en active Pending
-
2008
- 2008-09-04 CN CNU200820133665XU patent/CN201311277Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102768025A (en) * | 2012-07-19 | 2012-11-07 | 西安交通大学 | Multi-step variable frequency projected fringe measurement method for measuring each point on object independently |
| CN102768025B (en) * | 2012-07-19 | 2015-01-07 | 西安交通大学 | Multi-step variable frequency projected fringe measurement method for measuring each point on object independently |
| CN104089585A (en) * | 2014-07-28 | 2014-10-08 | 北京理工大学 | Macro-micro three-dimensional deformation measurement method based on single-width orthogonal grid lines |
| CN104089585B (en) * | 2014-07-28 | 2016-08-24 | 北京理工大学 | Grand microscopic three-dimensional deformation measurement method based on the orthogonal grid line of single width |
| CN105486245A (en) * | 2015-11-19 | 2016-04-13 | 中国航空工业集团公司北京航空材料研究院 | Experimental device and method for measuring depression depth of composite material after impact |
| CN106840251A (en) * | 2015-12-07 | 2017-06-13 | 中国电力科学研究院 | A kind of 3 D scanning system for the detection of low-voltage current mutual inductor outward appearance |
| CN106840251B (en) * | 2015-12-07 | 2020-04-14 | 中国电力科学研究院 | Three-dimensional scanning system for appearance detection of low-voltage current transformer |
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| CN201311277Y (en) | 2009-09-16 |
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