CN111256611A - Three-dimensional scanning light output device and three-dimensional scanning system - Google Patents
Three-dimensional scanning light output device and three-dimensional scanning system Download PDFInfo
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- CN111256611A CN111256611A CN201811465302.0A CN201811465302A CN111256611A CN 111256611 A CN111256611 A CN 111256611A CN 201811465302 A CN201811465302 A CN 201811465302A CN 111256611 A CN111256611 A CN 111256611A
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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 embodiment of the invention discloses a three-dimensional scanning light output device and a three-dimensional scanning system. The three-dimensional scanning light output device comprises an infrared laser light source, an optical fiber, an optical branching unit, a light collimation unit and a light beam direction adjusting unit; the output end of the infrared laser light source is connected with one end of the optical fiber, and the infrared laser light is output through the optical fiber; the optical branching unit comprises an input end and a plurality of output ends, and the input end is connected with the other end of the optical fiber; the light collimation unit is coupled with the output ends of the light branching unit and is used for collimating the infrared laser output by the output end of the light branching unit; and the beam direction adjusting unit is positioned on the emergent light path of the light collimating unit and used for changing the transmission direction of the infrared laser. The technical scheme of the embodiment of the invention provides the three-dimensional scanning light source with high beam quality, and the infrared light can avoid the mutual interference between the projection light and the visible light, so that the three-dimensional scanning system with higher scanning precision can be manufactured.
Description
Technical Field
The embodiment of the invention relates to a three-dimensional imaging technology, in particular to a three-dimensional scanning light output device and a three-dimensional scanning system.
Background
The three-dimensional laser scanning technology is a high and new technology appearing in the middle of the 90 s of the 20 th century, is a new full-automatic high-precision three-dimensional scanning technology, can completely acquire three-dimensional data of various complex and irregular real objects and real scenes into a computer by directly scanning with laser so as to quickly reconstruct a three-dimensional model of a target, and meanwhile, the acquired three-dimensional laser point cloud data can be subjected to various post-processing works such as metering, surveying and mapping, simulation, detection, virtual reality and the like.
In the laser scanning process, selecting a proper laser light source is often an important factor influencing the whole scanning result. Along with the development of electronic technology and laser technology, the projection light of laser scanner has developed line laser from original point laser, has promoted scanning speed and precision greatly, but the light source that the output light adopted still is traditional semiconductor laser, and the output light is visible ruddiness, and this kind of light source is clear visible, but light beam quality is poor, easily disperses, and light is amazing big to the human eye to easily mutually interfere with visible light, be unfavorable for the development of real color imaging in the future.
Disclosure of Invention
The embodiment of the invention provides a three-dimensional scanning light output device and a three-dimensional scanning system, so as to provide a three-dimensional scanning light source with high light beam quality, and infrared light can avoid mutual interference between projection light and visible light, so that the three-dimensional scanning system with higher scanning precision can be manufactured.
In a first aspect, an embodiment of the present invention provides a three-dimensional scanning light output device, including an infrared laser light source, an optical fiber, an optical branching unit, a light collimating unit, and a light beam direction adjusting unit;
the output end of the infrared laser light source is connected with one end of the optical fiber, and infrared laser is output through the optical fiber;
the optical branching unit comprises an input end and a plurality of output ends, and the input end is connected with the other end of the optical fiber;
the light collimation unit is coupled with the output ends of the light branching unit and is used for collimating the infrared laser output by the output end of the light branching unit;
and the beam direction adjusting unit is positioned on the emergent light path of the light collimating unit and is used for changing the transmission direction of the infrared laser.
Optionally, the infrared laser light source includes a fiber laser emitting infrared laser light.
Optionally, the wavelength range of the infrared laser is 2 μm to 5 μm.
Optionally, the fiber laser is a raman fiber laser.
Optionally, the fiber laser is a rare earth element doped fiber laser.
Optionally, the rare earth element includes at least one of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, and yttrium.
Optionally, the light collimating unit includes a plurality of lens groups, and each lens group is disposed in one-to-one correspondence with the output end of the light splitting unit.
Optionally, each of the lens groups includes a collimating lens and a cylindrical lens;
the collimating lens is used for collimating the infrared laser output by the output end of the optical branching unit;
the cylindrical lens is used for converging the infrared laser collimated by the collimating lens into linear infrared laser.
Optionally, the beam direction adjusting unit includes a plane mirror and a rotating mechanism, and the rotating mechanism drives the plane mirror to rotate so as to change the propagation direction of the infrared laser.
In a second aspect, an embodiment of the present invention further provides a three-dimensional scanning system, including the three-dimensional scanning light output device.
The three-dimensional scanning light output device provided by the embodiment of the invention comprises an infrared laser light source, an optical fiber, an optical branching unit, a light collimation unit and a light beam direction adjusting unit; the output end of the infrared laser light source is connected with one end of the optical fiber, and the infrared laser light is output through the optical fiber; the optical branching unit comprises an input end and a plurality of output ends, and the input end is connected with the other end of the optical fiber; the light collimation unit is coupled with the output ends of the light branching unit and is used for collimating the infrared laser output by the output end of the light branching unit; and the beam direction adjusting unit is positioned on the emergent light path of the light collimating unit and used for changing the transmission direction of the infrared laser. The infrared laser is generated by the infrared laser light source and transmitted to the light branching unit with a plurality of output ends through the optical fiber, the infrared laser is output by the output end of the light collimating unit collimating and branching unit, the infrared laser with high beam quality is output, the propagation direction of the infrared laser is adjusted by the beam direction adjusting unit, the three-dimensional scanning light source with high beam quality is provided, and the mutual interference between projection light and visible light can be avoided by the infrared light energy, so that the three-dimensional scanning system with higher scanning precision can be manufactured.
Drawings
FIG. 1 is a schematic structural diagram of a three-dimensional scanning light output device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another three-dimensional scanning light output device according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another three-dimensional scanning light output device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an optical path of a cylindrical lens provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another three-dimensional scanning light output device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a three-dimensional scanning light output device according to an embodiment of the present invention. Referring to fig. 1, the three-dimensional scanning light output device includes an infrared laser light source 10, an optical fiber 20, a light branching unit 30, a light collimating unit 40, and a beam direction adjusting unit 50; the output end of the infrared laser light source 10 is connected with one end of an optical fiber 20, and the infrared laser light is output through the optical fiber 20; the optical branching unit 30 includes an input end connected to the other end of the optical fiber 20 and a plurality of output ends; the light collimating unit 40 is coupled to a plurality of output ends of the optical branching unit 30, and is configured to collimate the infrared laser light output by the output end of the optical branching unit 30; and a beam direction adjusting unit 50, located on the outgoing light path of the light collimating unit 40, for changing the propagation direction of the infrared laser.
It can be understood that LASER is a short term for LASER Amplification, and has the advantages of high brightness, strong directivity, good monochromaticity, strong coherence, and the like. Infrared light refers to electromagnetic waves having wavelengths greater than 760 nm. The infrared laser light source 10 may be a laser generating infrared laser light, such as a solid laser, a semiconductor laser, a fiber laser, etc., and the laser is output through a pigtail and connected to the optical fiber 20. The optical fiber is a short term optical fiber, and light beams are bound into the optical fiber to be transmitted by utilizing the total reflection principle of light, and generally consist of a fiber core with high refractive index, a cladding with low refractive index and a coating layer with a protection function. The optical branching unit 30 may be a 1 × N fiber coupler with N outputs and one input, where N is an integer greater than or equal to 2, and may equally divide the infrared laser light into N outputs. The light collimating unit 40, corresponding to the N output ends of the optical branching unit 30, collimates and adjusts the infrared laser light into a linear light beam, and then changes the propagation direction of the light beam by the light beam direction adjusting unit 50, for example, rotates around a certain axis, so as to sequentially scan the surface of the object to be measured during three-dimensional scanning. For example, if the three-dimensional scanning light output device provided by the embodiment of the present invention is used in a reflective three-dimensional scanning system, a light receiving end (for example, a CCD) of the three-dimensional scanning system may be disposed on a reflected light path of the object to be measured, and the light beam direction adjusting unit 50 changes a propagation direction of light beams to implement a scanning process of the whole object to be measured.
According to the technical scheme, the infrared laser is generated through the infrared laser light source, the infrared laser is transmitted to the light branching unit with the plurality of output ends through the optical fiber, the infrared laser is output through the output end of the light collimating unit collimation branching unit, the infrared laser with high beam quality is output, the propagation direction of the infrared laser is adjusted through the beam direction adjusting unit, the three-dimensional scanning light source with high beam quality is provided, the mutual interference between projected light and visible light can be avoided through infrared light energy, and the three-dimensional scanning system with higher scanning precision can be manufactured conveniently.
On the basis of the above technical solution, optionally, the infrared laser light source includes a fiber laser that emits infrared laser light.
It will be appreciated that a laser includes a pump source that provides external energy (e.g., electrical, optical, etc.), a lasing substance that produces optical gain, and a cavity that provides optical positive feedback to form a lasing mode output. Because the fiber laser is the waveguide type structure, the coupling with the optical fiber is easy to realize, and compared with the traditional solid and gas laser, the fiber laser has the advantages of good beam quality, small volume, high conversion efficiency, good heat dissipation effect and the like. In specific implementation, a linear cavity fiber laser, a ring cavity fiber laser, or an 8-shaped cavity fiber laser may be adopted, and those skilled in the art may select the fiber laser according to actual conditions, which is not limited in the embodiments of the present invention.
Optionally, the wavelength range of the infrared laser is 2 μm to 5 μm.
It can be understood that the wavelength range of 2 μm to 5 μm is in the mid-infrared band, the band is located in the "transparent window" of the atmosphere, and the water molecules have better absorption coefficient in the mid-infrared band, so that the harm of the light in the band to human eyes can be reduced. The interference between the projection light and the visible light can be avoided due to the medium infrared light, so that the real color imaging can be realized in the future.
Optionally, the fiber laser is a raman fiber laser.
It is understood that the raman fiber laser is a laser that generates laser light based on the raman effect. The raman effect is that when light irradiates an object, it causes atoms inside the object to vibrate synchronously, and some photons hit the object get or lose energy, resulting in the appearance of light with different wavelengths. The light with different wavelengths is guided into a specific device, and the energy of the light is enhanced through reflection and collision, so that a synchronous laser beam, namely Raman laser, can be generated.
Optionally, the fiber laser is a rare earth element doped fiber laser.
Optionally, the rare earth element includes at least one of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, and yttrium.
It is understood that rare earth elements having the same outer electronic structure with multiple transition levels doped with one or more rare earth elements in the fiber can produce fiber lasers with gain in the range of 2 μm to 5 μm.
Fig. 2 is a schematic structural diagram of another three-dimensional scanning light output device according to an embodiment of the present invention. Referring to fig. 2, optionally, the light collimating unit 40 includes a plurality of lens groups 41, and each lens group 41 is disposed in one-to-one correspondence with the output end of the optical branching unit 30.
It can be understood that, because the radius of the optical fiber is small, the exit end face of the optical fiber can be regarded as a point light source, the light emitted therefrom is divergent light, the output end of the optical branching unit 30 is placed at the focal position of the lens group 41, and the light is collimated and shaped into a linear light beam by the lens group 41 for use in a three-dimensional scanning system.
Fig. 3 is a schematic structural diagram of another three-dimensional scanning light output device according to an embodiment of the present invention. Referring to fig. 3, alternatively, each lens group 41 includes one collimator lens 411 and one cylindrical lens 412; the collimating lens 411 is used for collimating the infrared laser output by the output end of the light branching unit 30; the cylindrical lens 412 is used to condense the infrared laser light collimated by the collimating lens 411 into linear infrared laser light.
Fig. 4 is a schematic optical path diagram of a cylindrical lens according to an embodiment of the present invention. Referring to fig. 4, the cylindrical lens may converge a bundle of parallel light rays into a bundle of linear light rays.
Fig. 5 is a schematic structural diagram of another three-dimensional scanning light output device according to an embodiment of the present invention. Referring to fig. 5, optionally, the beam direction adjusting unit 50 includes a plane mirror 51 and a rotating mechanism 52, and the rotating mechanism 52 drives the plane mirror 51 to rotate so as to change the propagation direction of the infrared laser.
It can be understood that the light beams reflected by the plane mirror 51 shown in fig. 5 are parallel linear light beams in the horizontal direction, that is, the intersection point of the light beam and the plane mirror 51 in fig. 5 is located on the same horizontal line, the intersection point on the upper side in the figure is located on the inner side of the lower intersection point in the vertical paper, and when the rotating mechanism 52 drives the plane mirror 51 to rotate (shown by the dotted line in fig. 5), the light beam will rotate for use in the three-dimensional scanning system.
The embodiment of the invention also provides a three-dimensional scanning system which comprises any one of the three-dimensional scanning light output devices provided by the embodiment. Since the three-dimensional scanning system provided by the embodiment of the present invention includes the three-dimensional scanning light output device provided by any of the above embodiments, the same and corresponding advantages as the three-dimensional scanning light output device included therein are provided, and details are not repeated herein.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A three-dimensional scanning light output device is characterized by comprising an infrared laser light source, an optical fiber, an optical branching unit, a light collimation unit and a light beam direction adjusting unit;
the output end of the infrared laser light source is connected with one end of the optical fiber, and infrared laser is output through the optical fiber;
the optical branching unit comprises an input end and a plurality of output ends, and the input end is connected with the other end of the optical fiber;
the light collimation unit is coupled with the output ends of the light branching unit and is used for collimating the infrared laser output by the output end of the light branching unit;
and the beam direction adjusting unit is positioned on the emergent light path of the light collimating unit and is used for changing the transmission direction of the infrared laser.
2. The three-dimensional scanning light output device according to claim 1, wherein the infrared laser light source comprises a fiber laser emitting infrared laser light.
3. The three-dimensional scanning light output device according to claim 1, wherein the infrared laser light has a wavelength in the range of 2 μm to 5 μm.
4. The three-dimensional scanning light output device according to claim 2, wherein the fiber laser is a raman fiber laser.
5. The three-dimensional scanning light output device according to claim 2, wherein the fiber laser is a rare earth doped fiber laser.
6. The three-dimensional scanning light output device according to claim 5, wherein the rare earth element comprises at least one of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, and yttrium.
7. The three-dimensional scanning light output device according to claim 1, wherein the light collimating unit comprises a plurality of lens groups, each of the lens groups being disposed in one-to-one correspondence with the output end of the light splitting unit.
8. The three-dimensional scanning light output device according to claim 7, wherein each of the lens groups comprises a collimating lens and a cylindrical lens;
the collimating lens is used for collimating the infrared laser output by the output end of the optical branching unit;
the cylindrical lens is used for converging the infrared laser collimated by the collimating lens into linear infrared laser.
9. The three-dimensional scanning light output device according to claim 1, wherein the beam direction adjusting unit comprises a plane mirror and a rotating mechanism, and the rotating mechanism drives the plane mirror to rotate so as to change the propagation direction of the infrared laser.
10. A three-dimensional scanning system comprising a three-dimensional scanning light output device according to any one of claims 1 to 9.
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