CN111366103A - Line color confocal measurement optical structure based on light cutting method - Google Patents
Line color confocal measurement optical structure based on light cutting method Download PDFInfo
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- CN111366103A CN111366103A CN202010319906.5A CN202010319906A CN111366103A CN 111366103 A CN111366103 A CN 111366103A CN 202010319906 A CN202010319906 A CN 202010319906A CN 111366103 A CN111366103 A CN 111366103A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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Abstract
The invention discloses a line color confocal measurement optical structure based on a light cutting method, and relates to the technical field of optics. The white light LED is positioned at a light inlet of the dispersion lens group, the dispersion lens group comprises a collimating lens body, a dispersion lens body and a focusing lens body which are sequentially arranged, the main plane is positioned right below the dispersion lens group and the imaging lens group, and the area array CCD is positioned at a light outlet of the imaging lens group. The principal plane that the imaging lens group placed that inclines can clearly image on the area array CCD that the slope was placed to make along the colored segment difference of principal plane direction evenly distributed can be caught by area array CCD, do benefit to the corresponding relation between principal plane colored segment difference and the principal plane high position, can calculate the actual section height profile of actual principal plane department light-cut testee through the computer, convenient and fast and accurate.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a line color confocal measurement optical structure based on a light cutting method.
Background
The light cutting method is a three-dimensional curved surface non-contact measuring method developed in more than ten years. The light plane is used to irradiate the object to be measured to generate a bright light band on its surface, the digital image of the light band can be obtained by CCD camera and digital signal processor DSP, and the three-dimensional outline information of the object surface can be obtained by computer processing.
At present, there are many methods for measuring the height of irregular objects, and from the basic principle, there are three main types: coordinate measurement, optical geometry, and optical interferometry. The coordinate measurement method is a contact measurement method, is not suitable for measuring the curved surface of soft materials such as the foot surface, and the optical geometry method and the optical interference method are non-contact measurement methods, but are not suitable for measuring complex surfaces with greatly changed surface undulations.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a line color confocal measurement optical structure based on a light cutting method, which has the advantages of simple measurement precision method and the like, and solves the problem of limitation of the conventional method for measuring the height of an irregular object.
(II) technical scheme
In order to realize the aim of simple accurate measurement method, the invention provides the following technical scheme: a linear color confocal measurement optical structure based on a light cutting method comprises a white light LED, a dispersion lens group, a main plane, an imaging lens group and an area array CCD, wherein the white light LED is positioned at a light inlet of the dispersion lens group, the dispersion lens group comprises a collimation lens body, a dispersion lens body and a focusing lens body which are sequentially arranged, the main plane is positioned right below the dispersion lens group and the imaging lens group, and the area array CCD is positioned at a light outlet of the imaging lens group.
As a preferred technical scheme of the invention, the white light LED is generated by an LED chip and is transmitted to the focus of the collimating lens body through an optical fiber.
As a preferred technical solution of the present invention, the imaging lens group is optimally designed for white light by using a lens based on an Ernosar structure.
As a preferable technical scheme of the invention, the main plane, the imaging lens of the imaging lens group and the area array CCD are mutually obliquely arranged, so that the Scheimpflug condition is met.
As a preferable mode of the present invention, the dispersing lens group and the imaging lens group are disposed symmetrically with respect to the principal plane.
(III) advantageous effects
Compared with the prior art, the invention provides a line color confocal measurement optical structure based on a light cutting method, which has the following beneficial effects: the principal plane that the imaging lens group placed that inclines can clearly image on the area array CCD that the slope was placed to make along the colored segment difference of principal plane direction evenly distributed can be caught by area array CCD, do benefit to the corresponding relation between principal plane colored segment difference and the principal plane high position, can calculate the actual section height profile of actual principal plane department light-cut testee through the computer, convenient and fast and accurate.
Drawings
FIG. 1 is a schematic structural diagram of a line-color confocal measurement optical structure based on a light sectioning method according to the present invention;
FIG. 2 is a schematic diagram of a dispersive lens assembly of a line-color confocal measurement optical structure according to the present invention;
FIG. 3 is a schematic structural diagram of an imaging lens assembly of a line-color confocal measurement optical structure according to the present invention;
fig. 4 is an energy wavelength relationship diagram of a line color confocal measurement optical structure based on a light section method.
In the figure: 1. a white light LED; 2. a dispersive lens group; 201. a collimating lens body; 202. a dispersive lens body; 203. a focusing lens body; 3. a principal plane; 4. an imaging lens group; 5. an area array CCD.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, a linear color confocal measurement optical structure based on a light-cutting method includes a white light LED1, a dispersive lens group 2, a main plane 3, an imaging lens group 4 and an area array CCD5, where the white light LED1 is located at a light inlet of the dispersive lens group 2, the dispersive lens group 2 includes a collimating lens body 201, a dispersive lens body 202 and a focusing lens body 203, which are sequentially arranged, the main plane 3 is located right below the dispersive lens group 2 and the imaging lens group 4, the area array CCD5 is located at a light outlet of the imaging lens group 4, and the imaging lens group 4 is optimally designed for white light by using a lens based on an Ernosar structure.
As a specific solution of this embodiment, the white LED1 is generated by an LED chip and transmitted to the focal point of the collimating lens body 201 through an optical fiber.
In this embodiment, the white LED1 realizes the collimated emission of white light through the collimating lens body 201.
As a specific technical solution of this embodiment, the principal plane 3, the imaging lens of the imaging lens group 4, and the area array CCD5 are disposed in an inclined manner, so as to satisfy the Scheimpflug condition.
In this embodiment, the color level differences uniformly distributed along the main plane 3 direction can be captured by the area array CCD5, which is favorable for the corresponding relationship between the color level differences of the main plane 3 and the height position of the main plane 3.
As a specific solution of this embodiment, the dispersive lens group 2 and the imaging lens group 4 are symmetrically disposed with respect to the principal plane 3.
In this embodiment, the main plane 3 is formed with color level differences uniformly distributed.
The working principle and the using process of the invention are as follows: in use, the dispersive lens group and the imaging lens group 4 are symmetrically positioned with respect to the main plane 3, white light is emitted by the white light LED1, transmitted via optical fibres to the dispersive lens group 2, the optical structure is dispersed into colors and distributed on the surface to be measured, the colors are uniformly distributed along the direction of a main plane 3, then the color is imaged on an area array CCD5 by an imaging lens group 4, the main plane 3, the imaging lens of the imaging lens group 4 and the area array CCD5 in the optical structure of linear color confocal measurement are mutually obliquely arranged, which meets the Scheimpflug condition, so that the main plane 3 obliquely arranged relative to the imaging lens group can be clearly imaged on the obliquely arranged area array CCD5, so that the color level differences uniformly distributed along the direction of the main plane 3 can be captured by the planar array CCD5, thereby facilitating the corresponding relationship between the color level differences of the main plane 3 and the height position of the main plane 3, the actual profile height profile of the optically cut object to be measured at the actual principal plane 3 can be calculated by a computer.
To sum up, this line colour confocal measurement optical structure based on light-cutting method, the principal plane 3 that the imaging lens group was placed to the slope can be clearly imaged on the face array CCD5 that the slope was placed to make along the 3 orientation evenly distributed's of principal plane chromatic segment difference can be caught by face array CCD5, do benefit to the corresponding relation between 3 chromatic segment differences in principal plane and the 3 high position of principal plane, can calculate the actual section height profile of the 3 department light-cut testees of actual principal plane through the computer, convenient and fast and accurate.
It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a confocal optical structure of measuring of line colour based on light-cutting method, includes white light LED (1), dispersion lens group (2), principal plane (3), imaging lens group (4) and area array CCD (5), its characterized in that: the white light LED (1) is positioned at a light inlet of the dispersion lens group (2), the dispersion lens group (2) comprises a collimation lens body (201), a dispersion lens body (202) and a focusing lens body (203) which are sequentially arranged, the main plane (3) is positioned right below the dispersion lens group (2) and the imaging lens group (4), and the area array CCD (5) is positioned at a light outlet of the imaging lens group (4).
2. The line color confocal measurement optical structure based on the light sectioning method as claimed in claim 1, wherein: the white light LED (1) is generated by an LED chip and is transmitted to the focus of the collimating lens body (201) through an optical fiber.
3. The line color confocal measurement optical structure based on the light sectioning method as claimed in claim 1, wherein: the imaging lens group (4) is formed by optimally designing white light by adopting a lens based on an Ernosar structure.
4. The line color confocal measurement optical structure based on the light sectioning method as claimed in claim 1, wherein: the main plane (3), the imaging lens of the imaging lens group (4) and the area array CCD (5) are mutually obliquely arranged, and the Scheimpflug condition is met.
5. The line color confocal measurement optical structure based on the light sectioning method as claimed in claim 1, wherein: the dispersive lens group (2) and the imaging lens group (4) are symmetrically arranged relative to the main plane (3).
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| CN202010319906.5A CN111366103A (en) | 2020-04-22 | 2020-04-22 | Line color confocal measurement optical structure based on light cutting method |
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| CN202010319906.5A CN111366103A (en) | 2020-04-22 | 2020-04-22 | Line color confocal measurement optical structure based on light cutting method |
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Citations (8)
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2020
- 2020-04-22 CN CN202010319906.5A patent/CN111366103A/en active Pending
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Effective date of registration: 20201210 Address after: 272000 complex building of laser research institute, Shandong Academy of Sciences, No.46 Haichuan Road, high tech Zone, Jining City, Shandong Province Applicant after: LASER INSTITUTE,SHANDONG ACADEMY OF SCIENCES Address before: A10, 4 / F, 168 Chunxu Road, Kunshan Development Zone, Suzhou City, Jiangsu Province 215300 (cluster registration) Applicant before: Kunshan shangrui Intelligent Technology Co.,Ltd. |
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