CN101696881A - Focusing system in triangulation - Google Patents
Focusing system in triangulation Download PDFInfo
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- CN101696881A CN101696881A CN200910108446A CN200910108446A CN101696881A CN 101696881 A CN101696881 A CN 101696881A CN 200910108446 A CN200910108446 A CN 200910108446A CN 200910108446 A CN200910108446 A CN 200910108446A CN 101696881 A CN101696881 A CN 101696881A
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Abstract
The invention relates to a focusing system which improves the focusing accuracy of an optical camera in a triangulation and accurately adjusts the distance between an optical lens and a measured object to a fixed distance. The system comprises a CCD, a lens, a laser, a video capture card, an image processing module, an automatic focusing module, a CNC control module and an execution module; the video capture card acquires an imaging position of laser on the CCD; the image processing module analyses the distance of the laser light deviating from the central position; the automatic focusing module obtains the displacement to be adjusted by the triangle calculation, and drives the lens and the laser by the execution module to enable the laser imaging position returns to the central status. Combined with the CNC technique, the laser point is automatically adjusted to the centre of CCD by using the image position of the laser point on the laser point so as to realize the accurate focusing position and ensure the measured accuracy every time. The experiments prove that the focusing precision of the system can reach 0.001mm by using the technique.
Description
Technical field
The present invention relates to improve the focusing accuracy of optical camera in triangulation, the distance of optical lens and testee is accurately adjusted to the focusing system of fixing distance.
Background technology
In existing measurement focus method, mostly be the manual adjustment object distance, the image of visual inspection testee when clear picture, is focal position.But there is artificial judgement in the method, and the test operation error is big, and automaticity is low.In addition, focusing also is a phase differential principle of utilizing image automatically, when the high frequency of image is maximum, is focal position; Yet this technology is as the focus method of precision measurement, still the precision deficiency.Fig. 1-3 shows the principle schematic of normal focusing and two kinds of undesired focusing respectively.
Summary of the invention
The purpose of this invention is to provide the accurate focal position of a kind of realization, guarantee the focusing system in the triangulation of each accuracy of measuring.
To achieve these goals, the present invention adopts following technical scheme:
It comprises CCD and camera lens, laser instrument, video frequency collection card, image processing module, automatic focus module, CNC control module, execution module, described video frequency collection card, obtain the image space of laser on CCD, image processing module analyzes the distance L of laser off-center position, the automatic focus module draws the displacement that will adjust by triangulation calculation, and this value is converted into the pulsed quantity of stepper motor, flow to the CNC module, drive motor drives camera lens and laser instrument, makes the laser imaging position get back to center situation.
Preferably, described automatic focus module calculates the displacement that will adjust by formula H=L*Tan (a), and a is the angle of laser instrument and optical axis.
The center of CCD in conjunction with the CNC technology, is adjusted to automatically with laser spots in the picture position of laser spots on CCD that utilize of the present invention, realizes accurate focal position, guarantees each accuracy of measuring.Experiment showed, this technology of employing, its focusing accuracy can reach 0.001mm.
Description of drawings
Fig. 1 is normal focusing principle synoptic diagram;
Fig. 2 is undesired focusing principle synoptic diagram;
Fig. 3 is another kind of undesired focusing principle synoptic diagram;
Fig. 4 is a system architecture synoptic diagram of the present invention;
Fig. 5 is a workflow synoptic diagram of the present invention.
The object of the invention, function and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Please refer to Fig. 4 and shown in Figure 5, focusing system in the triangulation of present embodiment comprises CCD and camera lens 1, laser instrument 2, video frequency collection card 3, image processing module 4, automatic focus module 5, CNC control module 6, execution module 7, described video frequency collection card 3, obtain the image space of laser on CCD, image processing module analyzes the distance of laser off-center position, automatic focus module 5 draws the displacement that will adjust by triangulation calculation, and, make the laser imaging position get back to center situation by execution module 7 driving camera lenses 1 and laser instrument 2.
Obtaining described displacement by triangulation calculation has several different methods, and in the present embodiment, described automatic focus module calculates the displacement that will adjust by formula H=L*Tan (a), and a is the angle of laser instrument and optical axis.
Above-mentioned described execution module comprises---stepper motor, and during work, described automatic focus module 5 is converted into the pulsed quantity of stepper motor with this value, flows to the CNC module, and drive motor drives camera lens 1 and laser instrument 2, makes the laser imaging position get back to center situation.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes instructions of the present invention and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (3)
1. the focusing system in the triangulation, it is characterized in that: it comprises CCD and camera lens, laser instrument, video frequency collection card, image processing module, automatic focus module, CNC control module, execution module, described video frequency collection card, obtain the image space of laser on CCD, image processing module analyzes the distance L of laser off-center position, the automatic focus module draws the displacement that will adjust by triangulation calculation, and, make the laser imaging position get back to center situation by execution module driving camera lens and laser instrument.
2. the focusing system in the triangulation as claimed in claim 1 is characterized in that: described automatic focus module calculates the displacement that will adjust by formula H=L*Tan (a), and a is the angle of laser instrument and optical axis.
3. the focusing system in the triangulation as claimed in claim 2, it is characterized in that: described execution module comprises---stepper motor, during work, described automatic focus module is converted into this value the pulsed quantity of stepper motor, flow to the CNC module, drive motor drives camera lens and laser instrument, makes the laser imaging position get back to center situation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910108446A CN101696881A (en) | 2009-07-03 | 2009-07-03 | Focusing system in triangulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910108446A CN101696881A (en) | 2009-07-03 | 2009-07-03 | Focusing system in triangulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101696881A true CN101696881A (en) | 2010-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN200910108446A Pending CN101696881A (en) | 2009-07-03 | 2009-07-03 | Focusing system in triangulation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430858A (en) * | 2011-10-10 | 2012-05-02 | 华中科技大学 | Automatic focusing adjustor for laser processing |
| CN105301865A (en) * | 2014-07-28 | 2016-02-03 | 奥宝科技股份有限公司 | Auto-focus system |
| CN113551651A (en) * | 2016-01-05 | 2021-10-26 | 上海筑邦测控科技有限公司 | Inclination angle sensor based on drop hammer position video identification technology |
-
2009
- 2009-07-03 CN CN200910108446A patent/CN101696881A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430858A (en) * | 2011-10-10 | 2012-05-02 | 华中科技大学 | Automatic focusing adjustor for laser processing |
| CN105301865A (en) * | 2014-07-28 | 2016-02-03 | 奥宝科技股份有限公司 | Auto-focus system |
| US10455137B2 (en) | 2014-07-28 | 2019-10-22 | Orbotech Ltd. | Auto-focus system |
| CN105301865B (en) * | 2014-07-28 | 2020-05-22 | 奥宝科技股份有限公司 | Automatic focusing system |
| CN113551651A (en) * | 2016-01-05 | 2021-10-26 | 上海筑邦测控科技有限公司 | Inclination angle sensor based on drop hammer position video identification technology |
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Application publication date: 20100421 |