CN111521993B - Passive nano antenna array receiver and three-dimensional imaging system - Google Patents
Passive nano antenna array receiver and three-dimensional imaging system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
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Abstract
The application relates to the technical field of three-dimensional imaging, and provides a passive nano-antenna array receiver and a three-dimensional imaging system, wherein the passive nano-antenna array receiver comprises a receiving lens, a receiving end passive nano-antenna array, a focusing lens assembly and a light receiver, wherein the receiving lens is used for focusing incident light to the receiving end passive nano-antenna array, the receiving end passive nano-antenna array performs angle deflection processing on a light beam output by the receiving lens so that an optical axis of emergent light of the receiving end passive nano-antenna array is perpendicular to the receiving end passive nano-antenna array, the focusing lens assembly is used for focusing the emergent light output by the receiving end passive nano-antenna array to the light receiver, the light receiver converts received light signals into electric signals, compared with a traditional optical diffraction device, the light beam direction realized by the receiving end passive nano-antenna array has larger design elasticity, and meanwhile can play a filtering role on specific wavelengths.
Description
Technical Field
The application relates to the technical field of three-dimensional imaging, in particular to a passive nano antenna array receiver and a three-dimensional imaging system.
Background
Three-dimensional imaging has wide application prospects in the fields of automobiles, industrial automation, virtual reality and the like. Current three-dimensional imaging systems include scanning and area array receiving. The scanning three-dimensional imaging is to complete single-point ranging by laser or LED light beams with small divergence angles, and then scan the light beams at different positions in space to form a three-dimensional image. The area array receiving type is generally flood light, part of the design adopts a scanning type transmitting end, and the receiving end adopts an area array receiving chip (also called a focal plane array, focal plane array).
However, in the existing scanning system, the system needs to keep a long measurement distance, and the receiving end must ensure a large receiving aperture, and scan synchronously with the transmitting end, so that the scanning mode is strictly required. The planar array receiving chip is adopted as a receiving end, so that wide-angle receiving can be realized and signal to noise ratio is ensured, but the design and development period of the planar array receiving chip is very long and is limited by the size of a pixel point and the complexity of a signal processing circuit, and the planar array receiving chip has the defect of low resolution. The three-dimensional imaging system continuously balances and combines the technical contents of scanning type emission and area array receiving, and at present, no technical means which can be suitable for various three-dimensional imaging application scenes exists.
Disclosure of Invention
The purpose of the application is to provide a passive nano antenna array receiver and a three-dimensional imaging system, which can be elastically applied to technical means of various three-dimensional imaging application scenes.
In order to solve the technical problems, embodiments of the present application provide a passive nano-antenna array receiver, which includes a receiving lens, a receiving end passive nano-antenna array, a focusing lens assembly and an optical receiver;
the receiving lens is used for receiving incident light and focusing the incident light to the receiving end passive nano antenna array;
the passive nano antenna array is used for performing angle deflection processing on the light beam output by the receiving lens and sending emergent light generated after the angle deflection processing to the focusing lens assembly, wherein the optical axis of the emergent light is perpendicular to the passive nano antenna array;
the focusing lens component is used for focusing emergent light output by the passive nano antenna array to the light receiver;
the optical receiver is used for converting a received optical signal into an electrical signal.
Optionally, the passive nano antenna array at the receiving end includes a plurality of sub antenna arrays, and deflection directions of the plurality of sub antenna arrays are different from each other.
Optionally, the sub-antenna array includes a plurality of sequentially arranged nano-antenna elements, where the sizes of the plurality of nano-antenna elements are distributed in a gradient phase to realize deflection control of the light beam.
Optionally, the material of the nano antenna element is at least one of a metal material, a semiconductor material and a dielectric material.
Optionally, the shape of the nano antenna element is at least one of a cylinder, a square, a cross, a round hole, a square hole, a cross hole, a V-shape, a ring-shaped linear shape and a curve shape.
Optionally, the relationship between the deflection angle of the sub-antenna array and the nano-antenna element is:
θ＝arctan(D/f)；
wherein θ is a deflection angle, D is a distance between the sub-antenna array and an optical axis of the outgoing light, and f is a focal length of the receiving lens.
The embodiment of the application also provides a three-dimensional imaging system, which comprises:
the laser transmitting unit is used for transmitting laser signals, wherein the laser signals are reflected by a target object to generate laser reflected signals;
the passive nano-antenna array receiver according to any one of the preceding claims, configured to receive a laser reflection signal and convert the laser reflection signal into a corresponding electrical signal;
a signal processing unit for receiving the electric signal and generating target distance information based on the electric signal;
and the central controller is used for sending a scanning signal to the laser emission unit so as to control the emission angle of the laser signal and generating the three-dimensional coordinates of the target object according to the scanning signal and the target distance information.
Optionally, the laser emitting unit includes:
a laser driving unit for generating a laser driving signal;
the laser is connected with the laser driving unit and used for generating a laser signal according to the laser driving signal;
the emission collimating lens is used for carrying out collimation treatment on the laser signals;
and the emission end light beam scanner is connected with the central controller and is used for receiving the scanning signals and adjusting the emission angles of the laser signals according to the scanning signals.
Optionally, the emission end light beam scanner is any one of a mechanical scanner, a micro-electromechanical system MEMS scanning mirror, an optical phased array solid state scanner and a spatial light modulator.
The beneficial effects of this application are as follows:
1) Compared with a three-dimensional imaging system adopting an area array receiving chip, the passive nano antenna array receiver in the embodiment of the application adopts a single-point or multi-point light receiver, so that the preparation cost of the three-dimensional imaging system is greatly reduced, and the elasticity and the signal-to-noise ratio of signal processing are improved;
2) Compared with a three-dimensional imaging system for receiving and transmitting synchronous scanning, the passive nano antenna array receiver in the embodiment of the application can realize solid-state signal receiving with a large aperture.
3) The passive nano antenna array receiver in the embodiment of the application adopts the design of the passive nano antenna array at the receiving end, has simple processing technology and does not need power-on control, and not only can reduce the power consumption of a three-dimensional imaging system, but also can reduce the manufacturing cost of the system.
4) The three-dimensional imaging system structure in the embodiment of the application can output more point clouds without being limited by the size of an area array, so that the spatial resolution is improved.
Drawings
Fig. 1 is a schematic structural diagram of a passive nano-antenna array receiver according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a passive nano antenna array at a receiving end according to an embodiment of the present application;
fig. 3 is a schematic phase distribution diagram of a passive nano antenna array at a receiving end according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of two sub-antenna arrays according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of deflection angles of two sub-antenna arrays according to an embodiment of the present application;
fig. 6 is a schematic diagram of deflection angles of a passive nano antenna array at a receiving end according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a three-dimensional imaging system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In a scanning type three-dimensional imaging system, when mechanical scanning is adopted, due to the difference of a transmitting end and a receiving end on an aperture, no matter a coaxial optical path or a parallel axis optical path is adopted, the balance between the scanning speed and the aperture is inevitably needed. And the MEMS micro-mirror is adopted for scanning, so that the aperture directly influences the scanning speed. A larger aperture will lead to a larger mechanical inertia and a lower scanning speed. In the solid-state scanning mode, an Optical Phased Array (OPA) is a common means, and the cost is very sensitive to the chip area due to the fact that the OPA is processed by adopting a chip-forming means, and the aperture is difficult to achieve very large. In order to save the cost, the system construction can be completed by adopting a wide-angle receiving mode at the receiving end, but the wide-angle receiving can introduce a large amount of background noise, meanwhile, the device loss can be greatly increased, and the large-angle receiving efficiency is very low. And the area array receiving three-dimensional imaging system needs to develop an area array receiving chip. The design and development cycle of the area array receiving chip is very long, the resolution is limited by the pixel point size and the complexity of a signal processing circuit, high-resolution three-dimensional imaging is difficult to be performed, and the problem of high cost exists. Meanwhile, because the emitting end adopts floodlight irradiation, crosstalk among signals received by each pixel point is serious, and stability is low.
In one embodiment, the problem of floodlight crosstalk can be solved by combining a scanning type transmitting end with an area array receiving end. But the resolution of the area array receiving chip is lower, and a new uncertainty of a scanning transmitting end is introduced, so that the stability of the three-dimensional imaging system is reduced. Therefore, the three-dimensional imaging system continuously balances and combines the technical contents of scanning type emission and area array receiving, and no technical means capable of providing enough elasticity suitable for various three-dimensional imaging application scenes exists at present.
Fig. 1 is a schematic diagram of a passive nano-antenna array receiver according to an embodiment of the present application, which includes a receiving lens 9, a receiving end passive nano-antenna array 10, a focusing lens assembly 11, and an optical receiver 12; the receiving lens 9 is configured to receive incident light (such as the light beam 6, the light beam 7, and the light beam 8 in fig. 1) and focus the incident light to the receiving-end passive nano-antenna array 10; the receiving end passive nano antenna array 10 is configured to perform angle deflection processing on the light beam output by the receiving lens 9, and send outgoing light generated after the angle deflection processing to the focusing lens assembly 11, where an optical axis of the outgoing light is perpendicular to the receiving end passive nano antenna array 10; the focusing lens assembly 11 is configured to focus outgoing light output by the receiving-end passive nano antenna array 10 to the light receiver 12; the optical receiver 12 is configured to convert a received optical signal into an electrical signal.
In the present embodiment, the passive nano-antenna array receiver is composed of the receiving lens 9, the receiving-end passive nano-antenna array 10, the focusing lens assembly 11, and the light receiver 12, thereby achieving an effect similar to that of a large-scale area array receiver. Specifically, the receiving lens 9 focuses the incident light onto the receiving-end passive nano antenna array 10, the receiving-end passive nano antenna array 10 performs angle deflection processing on the light beam output by the receiving lens 9, and sends the emergent light generated after the angle deflection processing to the focusing lens assembly 11, the optical axis of the emergent light is perpendicular to the receiving-end passive nano antenna array 10, and then the focusing lens assembly 11 focuses the emergent light onto the light receiver 12.
Furthermore, by combining with the scanning system of the transmitting end, the three-dimensional imaging system based on the passive nano antenna array receiver in the embodiment can simultaneously obtain the high signal-to-noise ratio (narrow field angle receiving and narrow field angle transmitting) of the scanning system and the large aperture and high-speed imaging capability of the area array receiving system.
In one embodiment, the passive nano-antenna array 10 includes a plurality of sub-antenna arrays, and the deflection directions of the plurality of sub-antenna arrays are different from each other.
In a scanning type three-dimensional imaging system, a receiving end is a core problem to be solved, the same scanning receiving mode is adopted at the receiving end, the aperture and the scanning speed are required to be balanced, and the synchronization with a transmitting end is very difficult. And when wide-angle receiving is adopted at the receiving end, a large amount of background noise is introduced, so that the measuring distance is greatly shortened. By adopting the area array receiver, each receiving pixel receives aiming at a certain narrow field angle, so that the signal-to-noise ratio is ensured, and high-speed imaging can be realized, however, the area array receiver has high development cost and is limited by the pixel point size and the complexity of signal processing, and the area of the area array receiver is greatly limited. In the embodiment, the passive nano antenna array receiver is adopted as an area array receiver, and the sub antenna array is adopted as the pixel point by utilizing the huge elasticity of the nano antenna in the aspect of beam shaping, so that the photosensitive unit and the signal processing unit are changed into single points or multiple points from large-scale array. Specifically, as shown in fig. 2, the incident light impinges on the sub-antenna arrays (as shown in the black part of fig. 2), and similar to the area array receiver, each sub-antenna array receives the incident light with a specific field angle, the optical axis of the emergent light of the incident light is refracted into a direction perpendicular to the passive nano-antenna array 10 at the receiving end after passing through all the sub-antenna arrays, and the refracted light field is refocused on the light receiver 12 after passing through the focusing lens assembly 11.
In one embodiment, the sub-antenna array includes a plurality of sequentially arranged nano-antenna elements, wherein the plurality of nano-antenna elements are sized to be distributed in a graded gradient phase to achieve deflection control of the light beam.
In one embodiment, the plurality of nano-antenna elements are repeatedly arranged with a separation distance between adjacent nano-antenna elements less than a wavelength of the incident light. In particular applications, it is desirable to predetermine the wavelength range of the incident beam to determine that the spacing of the nanoantenna elements in the passive nanoantenna array receiver is less than the incident beam wavelength.
Further, the nano-antenna element has a size less than twice the wavelength of the incident light. In this embodiment, each sub-antenna array corresponds to a specific deflection angle, so that the optical axis of the incident light focused thereon is deflected, for example, the incident light focused thereon is refracted, so that the optical axis of the refracted emergent light is perpendicular to the sub-antenna arrays, where the optical axis of the incident light is the center line of the incident light beam, and the optical axis of the emergent light is the center line of the emergent light beam.
In one embodiment, the overall phase distribution of the passive nano antenna array at the receiving end is shown in fig. 3, the deflection directions of a plurality of sub-antenna arrays are different from each other, each sub-antenna array in the passive nano antenna array at the receiving end 10 corresponds to a deflection angle, for example, as shown in fig. 4, an antenna interval of 1550nm is adopted in fig. 4a, a phase difference between adjacent antennas is 120 degrees, three antennas complete 360-degree phase coverage, and the refraction direction of light transmitted by the antenna arrays is shown in fig. 5 (a), so that an angle change of 19.4 degrees can be obtained at a wavelength of 1550 nm. And fig. 4b also adopts 1550nm antenna spacing, the phase difference between adjacent antennas is 90 degrees, the four antennas complete 360-degree phase coverage, the refraction direction of light transmitted by the antennas is shown in fig. 5 (b), and the angle deflection of 14.5 degrees can be obtained in 1550nm wave band, wherein the horizontal axis in fig. 5 is the deflection angle. Therefore, the design of the optical nano antenna provides great design flexibility, each pixel point (namely the sub-antenna array) can obtain different deflection angles, and the whole array does not need external driving, so that the optical nano antenna is a passive device, and the system design is greatly simplified.
In one embodiment, the material of the nano-antenna element is at least one of a metal material, a semiconductor material, and a dielectric material.
In this embodiment, the metal material may be gold, silver, copper, aluminum, etc., the dielectric material may be an optical dielectric material, the semiconductor material or the dielectric material may be titanium oxide (TiOx), silicon dioxide (SiO) 2 ) Silicon nitride (SiNx), gallium arsenide (GaAs), aluminum gallium arsenide (AlGaAs), and the like.
In one embodiment, the material of the nano-antenna element is any one of silicon, gallium arsenide, aluminum gallium arsenic, silicon nitride and indium phosphide.
In one embodiment, the center wavelength of the response of the passive nano-antenna array receiver in this embodiment may be 1550nm of the communication band, where the constituent material of the nano-antenna element may be any of monocrystalline silicon, polycrystalline silicon, or amorphous silicon.
In one embodiment, the nano-antenna element is at least one of a cylinder, a square, a cross, a round hole, a square hole, a cross hole, a V-shape, a circular line shape, and a curve shape.
In this embodiment, the antenna array layer is etched by using different masks, so as to form nano antenna elements with different shapes, and the shapes of the nano antenna elements are not limited to cylinders, squares, crosses, round holes, square holes, cross holes, V-shapes, annular lines and curves, and can be specifically set according to the needs of users.
In one embodiment, the relationship between the deflection angle of the sub-antenna array and the sub-antenna array is:
θ＝arctan(D/f)；
where θ is a deflection angle, D is a distance between the sub-antenna array and the optical axis of the outgoing light, and f is a focal length of the receiving lens 9.
In this embodiment, each sub-antenna array in the passive nano-antenna array receiver is used as a pixel point, and is distributed in a central symmetry manner with the optical axis as the center. Referring to fig. 6, assuming that the passive nano-antenna array receiver has a total of 2N sub-antenna arrays (-N, N), θ=arctan (D/f), d=d×n, N is the number of the sub-antenna arrays, D is the size of each sub-array antenna, the passive nano-antenna array receiver deflects the optical axis of the incident light by θ such that the optical axis of the outgoing light is perpendicular to the passive nano-antenna array receiver.
In one embodiment, the distance between the passive nano-antenna array receiver and the receiving lens 9 is equal to the focal length of the receiving lens 9.
In one embodiment, the optical receiver 12 is a single point optical receiver or a multi-point optical receiver.
The embodiment of the application further provides a three-dimensional imaging system, referring to fig. 7, the three-dimensional imaging system includes:
the laser transmitting unit is used for transmitting laser signals, wherein the laser signals are reflected by a target object to generate laser reflected signals;
the passive nano-antenna array receiver according to any one of the preceding claims, configured to receive a laser reflection signal and convert the laser reflection signal into a corresponding electrical signal;
a signal processing unit 13 for receiving the electric signal and generating target distance information based on the electric signal;
and a central controller 14 for transmitting a scanning signal to the laser transmitting unit to control the transmitting angle of the laser signal, and generating three-dimensional coordinates of the target object according to the scanning signal and the target distance information.
In this embodiment, the central controller controls the emission angle of the laser signal by sending a scanning signal to the laser emission unit, and the target distance signal generated by the signal processing unit, the emission angle of the laser signal, and the coordinate information of the three-dimensional imaging system itself can be combined to generate the three-dimensional coordinates of the target object.
Furthermore, the laser transmitting unit transmits laser signals in a scanning mode, and the scanning transmitting end is combined with the passive nano antenna array receiver provided by the embodiment, so that the problem of floodlight crosstalk can be solved, and the high signal-to-noise ratio of the scanning system can be obtained.
In one embodiment, referring to fig. 7, the laser emitting unit includes:
a laser driving unit 1 for generating a laser driving signal;
the laser 2 is connected with the laser driving unit and is used for generating a laser signal according to the laser driving signal;
a transmitting collimating lens 3 for collimating the laser signal;
and the emission end light beam scanner 4 is connected with the central controller and is used for receiving the scanning signals and adjusting the emission angles of the laser signals according to the scanning signals.
In one embodiment, the emission-side beam scanner 4 is any one of a mechanical scanner, a microelectromechanical system MEMS scanning mirror, an optical phased array solid state scanner, and a spatial light modulator.
A three-dimensional imaging system based on passive nano-antenna array receivers is shown in fig. 7. After the laser 2 is modulated by a laser driving signal provided by the laser driving unit 1, a laser signal (for example, a pulse optical signal) is collimated by the emission collimating lens 3 and then is emitted (for example, a laser signal 5) on the emission end beam scanner 4. The laser signal 5 is reflected after striking the target object, the reflected light (such as the incident beam 6, the incident beam 7, and the incident beam 8) is focused on the receiving-side passive nano-antenna array 10 after passing through the large aperture receiving lens 9, the receiving-side passive nano-antenna array 10 is composed of sub-antenna arrays (pixel points), each sub-antenna array corresponds to a deflection angle, the incident light incident on the pixel point is refracted into light parallel to the optical axis (i.e., the optical axis of the emergent light is perpendicular to the receiving-side passive nano-antenna array 10), after passing through two lenses in the focusing lens assembly 11, the light at all the incident angles is focused on the single or multiple light receivers 12, and then the signal processing unit 13 performs signal processing to recover the target distance information. The azimuth measurement of the whole three-dimensional imaging system is completed by the scanning type light spot, and the receiving end is indistinguishable and receives the light returned from all angles by one or a plurality of receivers, so that the equivalent effect of wide-angle receiving and area array receiving is realized.
In a passive nano-antenna array receiver and a three-dimensional imaging system provided by the application, the passive nano-antenna array receiver comprises a receiving lens, a receiving end passive nano-antenna array, a focusing lens assembly and a light receiver; the receiving lens is used for receiving incident light and focusing the incident light to the receiving end passive nano antenna array; the passive nano antenna array is used for carrying out angle deflection processing on the light beams output by the receiving lens and sending emergent light generated after the angle deflection processing to the focusing lens assembly, wherein the optical axis of the emergent light is perpendicular to the passive nano antenna array; the focusing lens component is used for focusing emergent light output by the passive nano antenna array to the light receiver; the optical receiver is used for converting a received optical signal into an electrical signal, and compared with a traditional optical diffraction device, the optical receiver has the advantages that the light beam direction realized by the passive nano antenna array at the receiving end has larger design elasticity and can play a role in filtering specific wavelengths.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (8)
1. The passive nano antenna array receiver is characterized by comprising a receiving lens, a receiving end passive nano antenna array, a focusing lens assembly and a light receiver;
the receiving lens is used for receiving incident light and focusing the incident light to the receiving end passive nano antenna array;
the passive nano antenna array is used for performing angle deflection processing on the light beam output by the receiving lens and sending emergent light generated after the angle deflection processing to the focusing lens assembly, wherein the optical axis of the emergent light is perpendicular to the passive nano antenna array; the receiving end passive nano antenna array comprises a plurality of sub antenna arrays, and the deflection directions of the plurality of sub antenna arrays are different from each other; the sub-antenna array comprises a plurality of sequentially arranged nano antenna elements, wherein the sizes of the plurality of nano antenna elements are distributed in a gradual gradient phase so as to realize deflection control of light beams; the spacing distance between adjacent nano antenna elements is smaller than the wavelength of the incident light;
the focusing lens component is used for focusing emergent light output by the passive nano antenna array to the light receiver;
the optical receiver is used for converting a received optical signal into an electrical signal.
2. The passive nano-antenna array receiver of claim 1, wherein the material of the nano-antenna element is at least one of a metallic material, a semiconductor material, and a dielectric material.
3. The passive nano-antenna array receiver of claim 1, wherein the nano-antenna element is at least one of cylindrical, square, cross, round hole, square hole, cross hole, V-shaped, and annular wire-like in shape.
4. The passive nano-antenna array receiver of claim 1, wherein a relationship between a deflection angle of the sub-antenna array and the nano-antenna element is:
θ=arctan（D/f）；
wherein θ is a deflection angle, D is a distance between the sub-antenna array and an optical axis of the outgoing light, and f is a focal length of the receiving lens.
5. The passive nano-antenna array receiver of claim 1, wherein the optical receiver is a single point optical receiver or a multi-point optical receiver.
6. A three-dimensional imaging system, the three-dimensional imaging system comprising:
the laser transmitting unit is used for transmitting laser signals, wherein the laser signals are reflected by a target object to generate laser reflected signals;
the passive nano-antenna array receiver of any one of claims 1-5, for receiving a laser reflected signal and converting the laser reflected signal into a corresponding electrical signal;
a signal processing unit for receiving the electric signal and generating target distance information based on the electric signal;
and the central controller is used for sending a scanning signal to the laser emission unit so as to control the emission angle of the laser signal and generating the three-dimensional coordinates of the target object according to the scanning signal and the target distance information.
7. The three-dimensional imaging system of claim 6, wherein the laser emitting unit comprises:
a laser driving unit for generating a laser driving signal;
the laser is connected with the laser driving unit and used for generating a laser signal according to the laser driving signal;
the emission collimating lens is used for carrying out collimation treatment on the laser signals;
and the emission end light beam scanner is connected with the central controller and is used for receiving the scanning signals and adjusting the emission angles of the laser signals according to the scanning signals.
8. The three-dimensional imaging system of claim 7, wherein the emission-side beam scanner is any one of a mechanical scanner, a microelectromechanical system MEMS scanning mirror, an optical phased array solid state scanner, and a spatial light modulator.
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| GB9420749D0 (en) * | 1994-10-14 | 1994-11-30 | Philips Electronics Uk Ltd | Directional radar arrangement |
| US7504985B2 (en) * | 2005-11-17 | 2009-03-17 | Board Of Regents Of The Nevada System Of Higher Education On Behalf Of The University Of Nevada, Reno | Multi-dimensional real-array radar antennas and systems steered and focused using fast fourier transforms |
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