Laser wired energy transfer distance-limiting ultra-large-angle emission system

Abstract

The invention discloses a laser wired energy transfer distance-limiting ultra-large angle transmitting system, which comprises a laser module, the laser module comprises a laser, an optical coupling unit is integrated at the output end of the laser, and a heat dissipation unit and a power control unit are further matched on a laser body; the laser transmission module comprises two groups of optical fiber joints and an energy transmission optical fiber limited between the two groups of optical fiber joints, the energy transmission optical fiber is provided with a beam splitting monitoring isolation unit, and one group of optical fiber joints is in butt joint with the laser module; and the laser distance-limiting super-large-angle transmitting module comprises a laser distance-limiting super-large-angle transmitting unit, the other group of optical fiber joints are in butt joint with the laser distance-limiting super-large-angle transmitting unit, the laser distance-limiting super-large-angle transmitting unit uniformly diverges emergent laser, and the diverged laser enters the photoelectric conversion unit and supplies energy to subsequent equipment. The laser wired energy transfer distance-limiting super-large-angle emission system can realize energy transfer characteristics of short-distance, large-angle, high-efficiency and uniform emission.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy transmission, in particular to a laser wired energy transmission limited distance and large angle emission system. BACKGROUND

[0002] At present, in many scenes such as unmanned aerial vehicles, mobile robots, rotating photoelectric platforms and distributed monitoring devices, the running time and task continuity of equipment are increasingly dependent on efficient and stable energy supply systems. With the increase of task complexity and execution time, the traditional power supply mode relying on built-in batteries has been difficult to meet the long-time and high-load work requirements. Frequent battery replacement not only reduces work efficiency, but also increases the uncertainty of task execution and operation and maintenance costs. On the other hand, many equipment need to maintain continuous movement or attitude change during execution, such as unmanned aerial vehicle hovering, photoelectric platform tracking, mobile platform patrol, etc. Such dynamic working conditions make it difficult for fixed or rigid energy supply connection to achieve stable energy transmission. Especially in high-precision control and remote operation tasks, the system requires the energy supply path to have high transmission efficiency, strong anti-interference ability, lightweight structure and high flexibility, so that the equipment can still run stably and reliably in complex space environment. The current energy supply methods mainly include the following types: traditional wired cable or slip ring energy supply, inductive or resonant wireless energy supply, free space laser energy transmission and optical fiber transmission laser scheme, each of which has its own advantages and disadvantages.

[0003] Among them, the optical fiber transmission laser scheme is a new energy transmission method that transmits laser energy through optical fiber. It uses the high transmission efficiency and anti-electromagnetic interference characteristics of optical waveguide to realize stable energy guidance in closed or complex space, avoiding electromagnetic compatibility and insulation problems in traditional electrical energy supply systems. Its structure is compact, the path is flexible, and the energy density is high, which has certain advantages in certain experimental or fixed distance energy supply occasions. However, the existing optical fiber transmission laser system mainly stays at the level of "long-distance guidance of light energy" or "long-distance irradiation of laser", which is mainly used for signal transmission, optical communication or energy transport of specific wave bands, and has not been optimized for the spatial distribution characteristics of light energy. Traditional design usually focuses on "guiding energy out", rather than "how to realize stable coupling in a specific working space", so there is a lack of precise control means for spot size, divergence angle and energy density distribution at the exit end. With the change of transmission distance, the spatial envelope and light power distribution of the light beam are difficult to keep consistent, resulting in insufficient effective energy utilization at the receiving end, which limits the popularization and application of this technology in high-precision and dynamic energy supply scenes. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application provides a laser wired energy transmission limited distance super large angle emission system, which can realize near distance high efficiency and long distance rapid attenuation energy transmission characteristics, effectively solves the problem that in the traditional optical fiber laser energy transmission system, only a small emission aperture can be realized at a short emission distance, realizes large angle uniform transmission of the light beam in a very limited distance through an optical system, and connects the receiving circuit and the emission module into one through a dust cover connecting body, so that the system is not affected by the environment such as sand and dust during the unmanned aerial vehicle hovering charging process, and the charging system can always maintain a high efficiency charging state.

[0005] A laser wired energy transmission limited distance super large angle emission system, comprising: A laser module, wherein the laser module comprises a laser, and a heat dissipation unit and a power control unit are matched on the laser body, and an optical coupling unit is integrated at the output end of the laser; A laser transmission module, wherein the laser transmission module comprises two groups of optical fiber joints and an energy transmission optical fiber limited between the two groups of optical fiber joints, a beam splitting monitoring isolation unit is installed on the energy transmission optical fiber, and one group of the optical fiber joints is connected with the laser module; A laser limited distance super large angle emission module, wherein the laser limited distance super large angle emission module comprises a laser limited distance super large angle emission unit, the other group of the optical fiber joints is connected with the laser limited distance super large angle emission unit, the laser limited distance super large angle emission unit uniformly diverges the outgoing laser, the diverged laser enters a photoelectric conversion unit and supplies power for subsequent equipment, and the laser limited distance super large angle emission unit further comprises a monitoring unit, and temperature and light intensity sensors are integrated in the monitoring unit to feed back monitoring results to the power control unit in real time.

[0006] As a preferred technical scheme of the above, the laser limited distance super large angle emission unit comprises a shell, one end of the shell is fixedly connected with an optical fiber joint, a group or multiple groups of flat concave lenses are sequentially arranged in the inner cavity of the shell from inside to outside, the energy transmission optical fiber is fixed in the optical fiber joint, the energy transmission optical fiber extends into the shell through the optical fiber joint and emits laser towards the flat concave lenses, a protective cover is arranged on the outer circle of the shell, and a battery receiving plate is fixed to the end of the protective cover.

[0007] As a preferred technical scheme of the above, the shell is in a stepped shaft structure, and the inner cavity of the shell is a stepped optical element installation cavity.

[0008] As a preferred technical scheme of the above, the flat concave lenses are provided in two groups, comprising a flat concave lens one and a flat concave lens two arranged from inside to outside, and the diameter of the flat concave lens one is smaller than that of the flat concave lens two.

[0009] As a preferred technical scheme of the above, the protective cover is in a horn shape.

[0010] As the preferred technical solution of the above, the laser adopts any one of semiconductor laser, fiber laser and solid laser.

[0011] As the preferred technical solution of the above, the wavelength of the laser source emitted by the laser adopts any one of 532±10nm, 808±10nm, 940±10nm, 976±10nm, 1064±10nm and 1550±10nm.

[0012] As the preferred technical solution of the above, the fiber coupling unit comprises a fast-axis collimating mirror, a slow-axis collimating mirror and a focusing mirror arranged side by side.

[0013] Compared with the prior art, the present application has the following advantages: 1. Improve energy transmission efficiency and realize high coupling matching: The present application aims to realize high-efficiency laser energy supply through fiber transmission. Fiber transmission avoids free-space energy diffusion and air absorption loss, and the transmission path is stable and the power density remains consistent, with high transmission efficiency, low loss and good beam uniformity. At the same time, a limited-distance beam shaping technology is introduced at the fiber exit end, and the beam divergence characteristics are accurately designed to make the laser quickly expand in a limited space to match the effective area of the receiving end battery, thereby realizing maximum energy coupling and optimal spot utilization within a predetermined transmission distance range. This limited-distance energy space matching design effectively solves the problems of uneven energy distribution and low utilization rate in traditional systems.

[0014] 2. Improve environmental adaptability and system stability: Unlike wireless energy transmission technology, the energy transmission process of the present application is completely enclosed in the fiber, and is not affected by rain, fog, sand, dust air disturbance, humidity change, dust scattering or metal reflection, with very high environmental adaptability. The fiber light guide path can maintain stable transmission characteristics under vibration, inclination and complex spatial layout, and is especially suitable for long-distance dynamic energy supply scenarios such as unmanned aerial vehicles and rotating platforms. The transmitting end adopts a closed structure, which further ensures that the output beam at the transmitting end is transmitted to the target without loss, avoiding energy drift caused by attitude fluctuations in traditional free-space systems.

[0015] 3. Realize flexible expansion and multi-target energy supply: Through modular fiber interface design, the transmitting system of the present application can flexibly configure single-channel or multi-channel fiber transmission structure according to actual task requirements. Using beam splitting and coupling or multi-port distribution, stable optical power output can be provided to multiple receiving ends at the same time, realizing multi-target energy supply. Since the divergence characteristics of the output spot of the fiber end can be independently controlled, there is no need for complex multi-point positioning and phase modulation systems, and the system has strong expandability and can maintain high efficiency.

[0016] 4. Eliminating electromagnetic radiation risks and ensuring power supply safety: The entire system is based on wired optical fiber energy transfer, eliminating the need for high-frequency electromagnetic fields or microwave emissions. Therefore, it will not interfere with surrounding electronic equipment or pose electromagnetic radiation risks to personnel. This characteristic gives the invention a significant advantage in highly safe and electromagnetically sensitive environments.

[0017] 5. Optimizing the fiber optic power supply system structure to achieve efficient energy matching within a limited distance: Addressing the issues of uncontrollable beam size and uneven energy distribution in existing fiber optic power transmission systems, this invention integrates a distance-limited beam shaping module at the fiber output end, achieving spatial matching between the beam area and the receiver area within a specific distance. Within the limited distance, the beam energy uniformly covers the receiving surface, achieving high-efficiency photoelectric conversion. This structure ensures efficient energy coupling within a limited distance while simplifying optical path design, providing a reliable engineering implementation method for wired laser power transmission. Attached Figure Description

[0018] Fig. 1 This is a schematic diagram of the system of the present invention.

[0019] Fig. 2 This is a cross-sectional view of the fiber-coupled structure of a semiconductor laser.

[0020] Fig. 3 This is a cross-sectional view showing the connection between the fiber optic output end and the laser-limited ultra-large angle emission module.

[0021] The attached diagram is labeled as follows: 1-Laser, 2-Heat dissipation unit, 3-Power control unit, 4-Optical coupling unit, 4a-Fast axis collimating lens, 4b-Slow axis collimating lens, 4c-Focusing lens, 5-Fiber optic connector, 6-Power transmission fiber, 7-Beam splitting monitoring and isolation unit, 8-Laser distance-limiting ultra-large angle emission unit, 8a-Housing, 8b-Planar-concave lens, 8c-Protective cover, 8d-Battery receiving board, 9-Photoelectric conversion unit, 10-Monitoring unit. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings: like Figs. 1 to 3 The laser wired power transmission limited-range ultra-large angle emission system shown includes: The laser module comprises a laser 1, a heat dissipation unit 2 and a power control unit 3 matched on the body of the laser 1, and an optical coupling unit 4 integrated at the output end of the laser 1; The laser transmission module comprises two groups of optical fiber joints 5 and an energy transmission optical fiber 6 limited between the two groups of optical fiber joints 5, the energy transmission optical fiber 6 is provided with a beam splitting monitoring isolation unit 7, and one group of the optical fiber joints 5 is connected with the laser module; The laser range limited ultra-large angle emission module comprises a laser range limited ultra-large angle emission unit 8, the other group of the optical fiber joints 5 is connected with the laser range limited ultra-large angle emission unit 8, the laser range limited ultra-large angle emission unit 8 uniformly diverges the outgoing laser, the diverged laser enters a photoelectric conversion unit 9 and provides energy for subsequent equipment, and the laser range limited ultra-large angle emission unit further comprises a monitoring unit 10, the monitoring unit 10 is integrated with a temperature and light intensity sensor, and is used for feeding back monitoring results to the power control unit 3 in real time.

[0024] In the embodiment, the laser range limited ultra-large angle emission unit 8 comprises a shell 8a, one end of the shell 8a is fixedly connected with the optical fiber joint 5, and a group or multiple groups of flat concave lenses 8b are sequentially arranged in the inner cavity of the shell 8a from inside to outside, the energy transmission optical fiber 6 is fixed in the optical fiber joint 5, the energy transmission optical fiber 6 extends into the shell 8a through the optical fiber joint 5 and emits laser to the flat concave lenses 8b, a protective cover 8c is arranged on the outer ring of the shell 8a, and a battery receiving plate 8d is fixed to the end of the protective cover 8c.

[0025] In the embodiment, the shell 8a is in a stepped shaft structure, and the inner cavity of the shell 8a is a stepped optical element mounting cavity.

[0026] In the embodiment, the flat concave lenses 8b are provided with two groups, comprising a flat concave lens one and a flat concave lens two arranged from inside to outside, and the diameter of the flat concave lens one is smaller than that of the flat concave lens two.

[0027] In the embodiment, the protective cover 8c is in a horn shape.

[0028] In the embodiment, the laser 1 adopts any one of a semiconductor laser, a fiber laser and a solid laser.

[0029] In the embodiment, the wavelength of the laser source emitted by the laser 1 adopts any one of 532 nm, 808 nm, 940 nm, 976 nm, 1064 nm and 1550 nm.

[0030] In the embodiment, the optical fiber coupling unit 4 comprises a fast-axis collimating mirror 4a, a slow-axis collimating mirror 4b and a focusing mirror 4c arranged side by side.

[0031] The system is described by taking the example of charging a UAV platform.

[0032] Specifically, the design limit distance is 100 mm, the transmitting end adopts a 10 W level 808 nm semiconductor laser 1, and the energy transmission optical fiber 6 is transmitted. The shaping module includes a f = -17 mm collimating lens and a f = -35 mm lens group. The test results show that at a distance of 100 mm from the end face of the energy transmission optical fiber 6, a spot diameter of 80-120 mm is achieved, the power density distribution is uniform, and the light intensity decreases by more than 80% when the distance exceeds 120 mm, effectively realizing the limit distance envelope.

[0033] Fig. 2 is a sectional view of the semiconductor laser fiber coupling structure, the fast-axis collimating mirror 4a is 0.19 mm away from the light-emitting end face of the semiconductor laser 1, the effective focal length is 1.6 mm, and the numerical aperture is 1.2. The slow-axis collimating mirror 4b is 13.25 mm away from the light-emitting end face of the semiconductor laser 1, the effective focal length is 14.27 mm, and the numerical aperture is 0.7. The focusing mirror 4c has a diameter of 10 mm and an effective focal length of 15 mm. The optical fiber joint 5 adopts an SMA905 joint.

[0034] When the laser limit distance large-angle emission module is installed, first, the stepped optical element mounting cavity and the dust cover 8c connecting body are assembled, the stepped optical element mounting cavity is mounted in the dust cover 8c connecting body along the optical axis direction, and after the screw hole positions of the two are aligned, the fixed screws are tightened to fix and ensure that there is no relative displacement between the mounting cavity and the connecting body. Then install the optical fiber joint 5, put the sealing element into the annular groove of the first connecting part of the stepped optical element mounting cavity, insert the optical fiber joint 5 into the first connecting part until the sealing element tightly fits the outer wall of the joint to realize sealing and concentric positioning, and then connect and fix the end of the energy transmission optical fiber 6 with the optical fiber joint 5. Then install and adjust the distance of the plano-concave lens 8b, put the plano-concave lens one into the corresponding stepped section of the stepped optical element mounting cavity to ensure that the lens outer wall tightly fits the inner wall of the mounting cavity to realize radial positioning, and adjust the axial distance from the end face of the optical fiber joint 5 to the plano-concave lens one to 17 mm according to the design requirements. Then place a non-compression type positioning spacer on one side of the plano-concave lens one, install the axial locking piece compression ring, and finally put the plano-concave lens two into the corresponding stepped section and tighten the compression ring to axially fix the plano-concave lenses one and two, and accurately ensure the axial distance between the two lenses of 22.80 mm through the positioning spacer. Finally, install the battery receiving plate 8d, align the tail end mounting surface of the dust cover 8c connecting body with the battery receiving plate 8d to ensure that the axial distance from the tail end of the connecting body to the end face of the optical fiber joint 5 is 100 mm, then tighten the battery receiving plate 8d and the dust cover 8c connecting body with the fixed screws to complete the assembly of the whole structure, as shown in Fig. 3 .

[0035] In the working of the embodiment, the semiconductor laser 1 outputs laser, which, after passing through the optical coupling unit 4, is coupled into the 200m energy transmission optical fiber 6 through the optical fiber joint 5; the light beam transmitted by the energy transmission optical fiber 6 first passes through the beam splitting monitoring isolation unit 7, in which the 999:1 optical fiber beam splitter divides a backward light beam to be incident on the power meter to measure the SBS threshold and to be incident on the spectrometer to observe the backward Stokes spectrum, the forward light is incident on the spectrometer and the oscilloscope to observe the forward time-domain stability and the forward spectrum, and the isolator prevents the backward back light from damaging the semiconductor laser 1; then the light beam enters the laser range-limited large-angle emission module, the outgoing laser is quickly and uniformly diverged by the two internal flat-concave lens 8b groups, the diverged light irradiates the photoelectric conversion unit 9 to supply energy for subsequent equipment, and the monitoring unit 10 monitors the receiving end in real time through the integrated temperature and light intensity sensor. The monitoring unit 10 feeds back signals such as the charging state and the abnormal state to the power control unit 3 of the system transmitting end in real time, the power control unit 3 adjusts the power output of the semiconductor laser 1 in combination with the light beam state information collected by the beam splitting monitoring isolation unit 7; when the corresponding equipment of the photoelectric conversion unit 9 is charged and no equipment is charged, the monitoring unit 10 feeds back a stop signal, and the power control unit 3 controls the semiconductor laser 1 to stop outputting laser immediately; in addition, the heat dissipation unit 2 adjusts the temperature of the semiconductor laser 1 in real time, and cooperates with the temperature rise detection of the monitoring unit 10 to form multiple safeguards. The closed-loop control of the front-end and back-end linkage enables the system to timely adjust the emission power, output duty cycle or modulation mode of the semiconductor laser 1 through the power control unit when the power fluctuates, the attitude changes or the thermal load increases, realizes stable power control and over-temperature protection, and finally achieves safe, stable and efficient light energy transmission and energy supply.

[0036] The laser range-limited large-angle emission module is arranged, the fast-switching optical fiber joint 5 and special optical components are integrated at the exit end of the energy transmission optical fiber 6, the precise design of the optical element structure is used, the spatial energy envelope of the outgoing light field is controlled to be limited in distance, the light beam has a large angle, a large aperture, a higher and uniform energy density in a limited working distance range, and high coupling efficiency is realized. The technology effectively solves the problem of small emission aperture in a short emission distance in the traditional optical fiber laser energy transmission system, the light beam is transmitted in a very limited distance through the optical system, the receiving circuit and the emission module are connected as a whole through the dust cover 8c connecting body, the system is not affected by the environment such as sand dust during the unmanned aerial vehicle hovering charging process, and the charging system can always maintain a high-efficiency charging state.

[0037] The state linkage control of the transmitting end and the receiving end of the application, by configuring the beam splitting monitoring isolation unit 7 and the heat dissipation unit 2 at the laser end, and configuring the monitoring unit 10 at the receiving end, realizes the state interaction and power adaptive control between the transmitting and receiving. The system can adjust the transmitting power, output duty cycle or modulation mode of the semiconductor laser 1 according to the feedback information of the receiving end monitoring unit 10 in real time, thereby realizing stable power control and over-temperature protection. The design establishes the closed-loop linkage relationship between the transmitting end and the receiving end, so that the system can automatically adjust the output when the power fluctuates, the attitude changes or the thermal load increases, and realizes safe, stable and efficient light energy transmission.

[0038] The system comprehensively uses the two key technologies of distance limiting beam shaping and state linkage control, realizes efficient coupling within the set distance and rapid decay beyond the distance through optical shaping, and realizes power closed-loop regulation and control and safety protection through the state feedback of the transmitting and receiving ends. The focus of protection is the collaborative mechanism of the above technical elements at the system level and its implementation effect, and is not limited to specific optical structures or electronic implementation methods, so as to ensure that the equivalent implementation of the technical scheme under different engineering conditions is covered.

[0039] The above is only the preferred embodiment of the application and is not used to limit the application. For those skilled in the art, the application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A laser-wireed energy transfer limited range ultra-wide angle emission system characterized by: The application relates to a laser module, a laser transmission module and a laser limited-distance large-angle emission module. The laser module comprises a laser, the output end of the laser is integrated with an optical coupling unit, and a heat dissipation unit and a power control unit are matched on the laser body; The laser transmission module comprises two groups of optical fiber joints and an energy transmission optical fiber limited between the two groups of optical fiber joints, a beam splitting monitoring isolation unit is installed on the energy transmission optical fiber, and one group of the optical fiber joints is connected with the laser module; The laser limited-distance large-angle emission module comprises a laser limited-distance large-angle emission unit, the other group of the optical fiber joints is connected with the laser limited-distance large-angle emission unit, the laser limited-distance large-angle emission unit uniformly diverges the outgoing laser, the diverged laser enters a photoelectric conversion unit and supplies energy for subsequent equipment, and the laser limited-distance large-angle emission unit further comprises a monitoring unit, temperature and light intensity sensors are integrated in the monitoring unit, and the monitoring unit is used for feeding back monitoring results to the power control unit in real time.

2. A laser wire energy transmission limited range ultra-wide angle emission system according to claim 1, characterized in that: The laser limited-distance large-angle emission unit comprises a shell, one end of the shell is fixedly connected with an optical fiber joint, a group or multiple groups of flat-concave lenses are sequentially arranged in the inner cavity of the shell from inside to outside, the energy transmission optical fiber is fixed in the optical fiber joint, the energy transmission optical fiber extends into the shell through the optical fiber joint and emits laser towards the flat-concave lenses, a protective cover is arranged on the outer ring of the shell, and a battery receiving plate is fixed at the tail end of the protective cover.

3. A laser wire energy transmission limited range ultra-wide angle emission system according to claim 2, characterized in that: The shell is in a stepped shaft structure, and the inner cavity of the shell is a stepped optical element installation cavity.

4. A laser wire energy transfer limited range ultra-wide angle emission system according to claim 2, characterized in that: The flat-concave lenses are arranged in two groups, comprising a flat-concave lens one and a flat-concave lens two arranged from inside to outside, and the diameter of the flat-concave lens one is smaller than that of the flat-concave lens two.

5. A laser wire energy transfer limited range ultra-wide angle emission system according to claim 2, wherein: The protective cover is in a horn shape.

6. A laser wire energy transfer limited range ultra-wide angle emission system according to claim 1, characterized in that: The laser adopts any one of a semiconductor laser, a fiber laser and a solid laser.

7. A laser wire energy transfer limited range ultra-wide angle emission system according to claim 6, wherein: The wavelength of the laser source emitted by the laser adopts any one of 532+ / -10nm, 808+ / -10nm, 940+ / -10nm, 976+ / -10nm, 1064+ / -10nm and 1550+ / -10nm.

8. A laser wire energy transfer limited range ultra-wide angle emission system according to claim 1, characterized by: The optical fiber coupling unit comprises a fast-axis collimating mirror, a slow-axis collimating mirror and a focusing mirror arranged side by side.

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