CN209821387U - Laser imaging system based on triangular ranging - Google Patents
Laser imaging system based on triangular ranging Download PDFInfo
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- CN209821387U CN209821387U CN201920229562.1U CN201920229562U CN209821387U CN 209821387 U CN209821387 U CN 209821387U CN 201920229562 U CN201920229562 U CN 201920229562U CN 209821387 U CN209821387 U CN 209821387U
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Abstract
The utility model discloses a laser imaging system based on triangle is ranged range, include: the laser light source is used for emitting light with a preset wavelength; the lens array is used for receiving the light of the laser light source and converting the received light into a linear light source; the grating is used for receiving the line light source and improving the density of emergent light by rotating the grating. This laser imaging system makes the single line source of formation that laser source sent through lens array, and the rethread grating converts a series of parallel line sources into, and rotatory grating of rethread makes each single line source split into several tiny line sources again, through adjustment rotation angle, and then the density of the improvement line source of doubling, and then improves resolution ratio.
Description
Technical Field
The utility model relates to a laser imaging technology field, more specifically say, especially relate to a laser imaging system based on triangle range finding.
Background
For short-distance laser ranging, triangular ranging is a high-precision and high-speed ranging method, and generally, a triangular ranging method using a dot matrix is developed along with continuous development of scientific technology by selection of two light sources, namely a single-point light source and a linear light source.
The existing triangular distance measurement method adopting the lattice adopts the Dammann grating, wherein the Dammann grating is a Fourier transform type array illuminator with a relief type binary phase structure, the diffraction efficiency of the Dammann grating depends on the coordinates and the phase of a relief type step structure on the surface of a device, the resolution of the Dammann grating which is commercially used at present is 64 multiplied by 64, and the processing of the Dammann grating has certain difficulty, as shown in figure 1, figure 1 is a Dammann grating uniform illumination lattice with the resolution of 64 multiplied by 64, so that cross-shaped processing defects can be seen, the Dammann grating with higher resolution has higher processing difficulty and is easier to generate defects, and meanwhile, the resolution of 64 multiplied by 64 cannot meet the resolution requirement under a plurality of application scenes, so that the application range of the Dammann grating is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a laser imaging system based on triangle range finding, this laser imaging system has improved the resolution ratio of light, and can reach hundreds of resolution ratios in the one-dimensional, and simple structure.
In order to achieve the above object, the utility model provides a following technical scheme:
a laser imaging system based on triangulation, the laser imaging system comprising:
the laser light source is used for emitting light with a preset wavelength;
the lens array is used for receiving the light of the laser light source and converting the received light into a linear light source;
the grating is used for receiving the line light source and improving the density of emergent light by rotating the grating.
Preferably, in the above laser imaging system, the laser imaging system further includes: an optical filter;
the optical filter is arranged at the position of a light outlet of the laser light source.
Preferably, in the above laser imaging system, the filter is configured to pass light with a wavelength of 905nm, light with a wavelength of 915nm, or light with a wavelength of 940 nm.
Preferably, in the above laser imaging system, the laser light source is configured to emit light with a wavelength of 905nm, light with a wavelength of 915nm, or light with a wavelength of 940 nm.
Preferably, in the above laser imaging system, the lens array is a lenticular lens array.
Preferably, in the above laser imaging system, the grating is a two-dimensional dammann grating.
Preferably, in the above laser imaging system, the number of the two-dimensional dammann gratings is one.
Can know through the above-mentioned description, the utility model provides a pair of laser imaging system based on triangle range finding, include: the laser light source is used for emitting light with a preset wavelength; the lens array is used for receiving the light of the laser light source and converting the received light into a linear light source; the grating is used for receiving the line light source and improving the density of emergent light by rotating the grating.
This laser imaging system makes the single line source of formation that laser source sent through lens array, and the rethread grating converts a series of parallel line sources into, and rotatory grating of rethread makes each single line source split into several tiny line sources again, through adjustment rotation angle, and then the density of the improvement line source of doubling, and then improves resolution ratio.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art Dammann grating uniform illumination lattice with a resolution of 64 × 64;
fig. 2 is a schematic structural diagram of a laser imaging system based on triangulation distance measurement according to an embodiment of the present invention;
fig. 3 is a schematic view of a shape of a light spot formed in a far field when a lenticular lens array and a dammann grating are parallel according to an embodiment of the present invention;
fig. 4 is a schematic view of a light spot shape formed in a far field when the lenticular lens array and the dammann grating form a certain angle according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a laser imaging system based on triangular ranging provided by the embodiment of the present invention, the laser imaging system includes: laser light source, lens array and grating.
The laser light source is used for emitting light with a preset wavelength; the lens array is used for receiving the light of the laser light source and converting the received light into a linear light source; the grating is used for receiving the linear light source and improving the density of emergent light by rotating the grating.
Optionally, the laser light source is configured to emit light with a wavelength of 905nm, or light with a wavelength of 915nm, or light with a wavelength of 940 nm.
Specifically, in the embodiment of the present invention, the laser light source includes, but is not limited to, a semiconductor laser, and the wavelength of the emitted light is also not limited, and may be determined according to specific situations.
Optionally, the lens array is a lenticular lens array.
Specifically, because lens array need be received light conversion for the line light source, consequently the embodiment of the utility model provides an including but not be limited to adopt the lenticular array to realize receiving light conversion for the line light source, the lenticular array possesses advantages such as with low costs and conversion effect is good.
Optionally, the grating is a two-dimensional dammann grating, and the number of the two-dimensional dammann gratings is one.
Specifically, the laser imaging system enables a laser light source to emit light to form a single line light source through the cylindrical lens array, the divergence angle of the line light source is maintained at about 90 degrees, then the single line light source is converted into a series of parallel line light sources (about 64 paths of the line light source) through a two-dimensional Dammann grating with the resolution ratio of 8 x 8, then each single line light source is split into a plurality of fine line light sources through rotating the two-dimensional Dammann grating, the line laser arrays with different resolutions can be recombined through adjusting the rotation angle, the density of the line light sources is multiplied, and the resolution ratio is further improved.
For example, as shown in fig. 3 and 4, the density of the schematic diagram of the light spot in fig. 4 is much greater than that of the schematic diagram of the light spot in fig. 3, and the gray scale value in fig. 3 and 4 is proportional to the light intensity, and a line laser array of 16-way, 32-way, 64-way, etc. can be realized by rotating the two-dimensional dammann grating with a resolution of 8 × 8. Meanwhile, as the linear laser is adopted, the transverse resolution ratio far exceeds that of the Dammann grating, hundreds of resolution ratios can be easily achieved, and a high-resolution linear laser array can be obtained. Then, a CMOS camera is used for capturing the projected light field, marking is carried out through an algorithm, and then laser of each line is marked independently, so that the point cloud data of the distance can be obtained through a triangulation distance measurement method.
Therefore, the utility model provides a pair of laser imaging system based on triangle range finding has reduced the parameter requirement of Dammann grating, adopts the lower Dammann grating of resolution ratio to realize higher resolution ratio promptly, like this in reduce cost still very big degree the improvement performance, through the angle of rotatory change Dammann grating, realize the conversion of different resolution ratios, adaptable different application occasions.
Further, the laser imaging system further comprises: an optical filter; the optical filter is arranged at the position of a light outlet of the laser light source. The optical filter is used for passing light with the wavelength of 905nm, light with the wavelength of 915nm or light with the wavelength of 940 nm.
Specifically, the optical filter is used for reducing the influence of ambient light in the transmission process of light emitted by the laser light source so as to improve the light transmission quality.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A laser imaging system based on triangulation, the laser imaging system comprising:
the laser light source is used for emitting light with a preset wavelength;
the lens array is used for receiving the light of the laser light source and converting the received light into a linear light source;
the grating is used for receiving the line light source and improving the density of emergent light by rotating the grating.
2. The laser imaging system of claim 1, further comprising: an optical filter;
the optical filter is arranged at the position of a light outlet of the laser light source.
3. A laser imaging system according to claim 2, wherein the filter is configured to pass light having a wavelength of 905nm, 915nm or 940 nm.
4. The laser imaging system of claim 1, wherein the laser light source is configured to emit light having a wavelength of 905nm, 915nm, or 940 nm.
5. The laser imaging system of claim 1, wherein the lens array is a lenticular lens array.
6. The laser imaging system of claim 1, wherein the grating is a two-dimensional dammann grating.
7. The laser imaging system of claim 6, wherein the number of two-dimensional Dammann gratings is one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920229562.1U CN209821387U (en) | 2019-02-18 | 2019-02-18 | Laser imaging system based on triangular ranging |
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| CN201920229562.1U CN209821387U (en) | 2019-02-18 | 2019-02-18 | Laser imaging system based on triangular ranging |
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| CN209821387U true CN209821387U (en) | 2019-12-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613561A (en) * | 2019-02-18 | 2019-04-12 | 合肥独领智能科技有限公司 | A kind of laser imaging system based on range of triangle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613561A (en) * | 2019-02-18 | 2019-04-12 | 合肥独领智能科技有限公司 | A kind of laser imaging system based on range of triangle |
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Effective date of registration: 20220407 Address after: Room 1743, hatching Eagle building, No. 99, Tuanjie Road, yanchuang Park, Nanjing area, China (Jiangsu) pilot Free Trade Zone, Nanjing, Jiangsu 211899 Patentee after: Jiangsu Xinxin Photoelectric Technology Co.,Ltd. Address before: 230000 room 508, R & D center building, China (Hefei) international voice Industry Park, 3333 Xiyou Road, high tech Zone, Hefei, Anhui Province Patentee before: HEFEI ZHILING INTELLIGENT TECHNOLOGY Co.,Ltd. |