A laser wireless energy transmission system based on a spectroscopic device

Abstract

The present invention discloses a laser wireless energy transmission system based on a spectroscopic device, comprising a laser emitting device for emitting laser, a spectroscopic device for receiving the laser and dividing the laser into n spectroscopic beams with the same luminous flux, and a hollow spherical photovoltaic receiver for receiving the spectroscopic beams and converting the spectroscopic beams into electric energy. The center of the hollow spherical photovoltaic receiver is provided with n spectroscopic brackets uniformly distributed outward in a radial shape. The n spectroscopic brackets are used to fix the output optical fibers of the spectroscopic device, so that the n spectroscopic beams with the same luminous flux correspond to directly irradiate the 360 / n degree solid angle area of ​​the hollow spherical photovoltaic receiver. The method of spectroscopically splitting the laser can ensure that each area of ​​the inner wall of the hollow spherical photovoltaic receiver can be directly irradiated by the laser, thereby reducing the difference in light intensity in different areas. The closed hollow structure of the hollow spherical photovoltaic receiver is further utilized to reuse the energy of the laser, thereby improving the photoelectric conversion efficiency and output power of the laser wireless energy transmission system based on the spectroscopic device.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless energy transmission, and in particular to a laser wireless energy transmission system based on a spectrometer. Background Art

[0002] The advantages of high energy density, small divergence angle, and good directionality give lasers a strong technical advantage in the field of wireless energy transmission. However, although the lasers, photovoltaic cells, and related optical technologies used for laser wireless energy transmission have matured, there is no mature laser wireless energy transmission system that has been widely used. The main reason is that the output power of the laser wireless energy transmission system is low, and the photoelectric conversion efficiency is far lower than the conversion efficiency of a single photovoltaic cell.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0004] The technical problem to be solved by the present invention is that, in view of the defects of the prior art, the present invention provides a laser wireless energy transmission system based on a spectrometer, aiming to achieve the reuse of lasers, improve the photoelectric conversion efficiency and the low output power of the laser wireless energy transmission system.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] A laser wireless energy transmission system based on a spectrometer, characterized in that it includes a laser emitting device for emitting laser, a spectrometer for receiving the laser and splitting the laser into n spectrometers with the same luminous flux, and a hollow spherical photovoltaic receiver for receiving the spectrometer and converting the spectrometer into electrical energy, wherein the center of the hollow spherical photovoltaic receiver is provided with n spectrometer brackets uniformly distributed radially outward, and the n spectrometer brackets are used to fix the output optical fiber of the spectrometer, so that the n spectrometers with the same luminous flux can be directly irradiated to the 360 / n degree solid angle area of ​​the hollow spherical photovoltaic receiver, wherein 2≤n≤360.

[0007] Furthermore, the optical splitting device includes an optical receiver and an optical fiber splitter connected to the optical receiver, the optical fiber splitter includes an input optical fiber and n output optical fibers connected to the input optical fiber, and the n output optical fibers are used to split the laser input by the input optical fiber into n parts of the same light flux.

[0008] Furthermore, the optical receiver is a conical optical receiver, the bottom large-diameter end face of the conical optical receiver is the laser input end face, and the top small-diameter end face of the conical optical receiver is the laser output end face.

[0009] Furthermore, a reflective film is provided on the inner side surface of the conical light receiver.

[0010] Furthermore, the output ends of the n output optical fibers are correspondingly fixed on the n light splitting brackets.

[0011] Furthermore, n=360.

[0012] Furthermore, the laser emitting device comprises a laser for emitting laser light and a beam expander for collimating the laser light.

[0013] Furthermore, the interior of the hollow spherical photovoltaic receiver is made of silicon-based photovoltaic cells or photovoltaic materials.

[0014] Furthermore, the photovoltaic material is one of GaInP / GaAs / Ge, GaInP2 / GaAs / Ge or GaInP / InAs / Ge.

[0015] Furthermore, the laser wireless energy transmission system based on the spectroscopic device also includes an electric energy manager electrically connected to the hollow spherical photovoltaic receiver, and a terminal device electrically connected to the electric energy manager.

[0016] Beneficial effects: The present invention discloses a laser wireless energy transmission system based on a spectroscopic device, comprising a laser emitting device for emitting laser light, a spectroscopic device for receiving the laser light and dividing the laser light into n spectroscopic lights of the same light flux, and a hollow spherical photovoltaic receiver for receiving the spectroscopic lights and converting the spectroscopic lights into electrical energy. The center of the hollow spherical photovoltaic receiver is provided with n spectroscopic brackets uniformly distributed outward in a radial shape, and the n spectroscopic brackets are used to fix the output optical fiber of the spectroscopic device, so that the n spectroscopic lights of the same light flux correspond to direct irradiation to the 360 / n degree solid angle area of ​​the hollow spherical photovoltaic receiver. The present invention can ensure that each area of ​​the inner wall of the hollow spherical photovoltaic receiver can be directly irradiated by the laser by using the spectroscopic bracket to split the laser light, reduce the difference in light intensity in different areas, further utilize the closed hollow structure of the hollow spherical photovoltaic receiver, reuse the energy of the laser, and improve the photoelectric conversion efficiency and output power of the laser wireless energy transmission system based on the spectroscopic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a preferred embodiment of the laser wireless energy transmission system based on the spectrometer of the present invention.

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the mid-spectral splitter.

[0019] Figure 3 for Figure 1 Schematic diagram of the structure of the mid-beam splitter bracket.

[0020] The purpose, features and advantages of the present invention will be described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] See also Figure 1 and Figure 2 The present invention provides a laser wireless energy transmission system based on a spectrometer, as shown in the figure, which includes a laser emitting device 10 for emitting laser, a spectrometer 20 for receiving the laser and dividing the laser into n spectrometers with the same light flux, and a hollow spherical photovoltaic receiver 14 for receiving the spectrometer and converting the spectrometer into electrical energy. The center of the hollow spherical photovoltaic receiver 14 is provided with n spectrometer brackets 15 uniformly distributed radially outward, and the n spectrometer brackets 15 are used to fix the output optical fiber of the spectrometer, so that the n spectrometers with the same light flux can be directly irradiated to the 360 / n degree solid angle area of ​​the hollow spherical photovoltaic receiver 14, wherein 2≤n≤360.

[0023] This embodiment uses the light splitting bracket 15 to split the laser to ensure that each area of ​​the hollow spherical photovoltaic receiver 14 array receiver can be directly irradiated by the laser, reducing the difference in light intensity between direct irradiation and indirect irradiation, and improving and enhancing the uniformity of light. Specifically, the laser after light splitting uses the closed hollow structure of the hollow spherical photovoltaic receiver 14 to produce multiple reflections on the inner wall of the hollow spherical photovoltaic receiver 14 to achieve the effect of light uniformity, and uses its airtightness to reuse the energy of the laser, thereby improving the output power and photoelectric conversion efficiency of the laser wireless energy transmission system based on the light splitting device.

[0024] In some embodiments, Figure 1The laser emitting device 10 shown includes a laser 11 for emitting laser light and a beam expander 12 for collimating the laser light. In this embodiment, the laser 11 can emit laser light with a wavelength of 808nm, 532nm, 880nm or 1064nm, but is not limited thereto; the beam expander 12 is used to collimate the laser light, and the collimated laser light can enter the air or other medium for long-distance transmission to reach the spectrometer 20. After the laser light is collimated by the beam expander 12, the emission angle of the laser light becomes smaller and the spot diameter becomes larger. The reduction of the laser divergence angle is conducive to reducing the transmission loss of the laser light in the air or other media, and the increase of the laser spot size can also prevent the high-energy laser light with a small spot from burning the end face of the spectrometer 20. In some specific embodiments, the beam expander 12 can be a Galilean beam expander or a Keplerian beam expander, and can be a fixed magnification or a variable magnification beam expander, but is not limited thereto.

[0025] In some embodiments, Figure 2 As shown, the optical splitter 20 includes an optical receiver 21 and an optical fiber splitter connected to the optical receiver 21, wherein the optical fiber splitter includes an input optical fiber 22 and n output optical fibers 23 connected to the input optical fiber, and the n output optical fibers 23 are used to split the laser input from the input optical fiber 22 into n parts of the same light flux. Specifically, the optical receiver 21 is a conical optical receiver, the bottom large diameter end face of the conical optical receiver is the laser input end face, and the top small diameter end face of the conical optical receiver is the laser output end face. The conical optical receiver is made of transparent materials, such as fused quartz or K9 glass, but not limited thereto. The bottom large diameter end face of the conical optical receiver is used as the laser input end face because the laser emitted by the laser 11 is transmitted over a long distance, and the diameter of the laser spot becomes larger. A large-area optical device is required to collect the transmitted laser, collect as much laser as possible, and reduce the difficulty of projecting the laser spot to the optical splitter 20. The top small diameter end face of the conical optical receiver is used as the laser output end face because it is beneficial to couple the collected laser into the input optical fiber 22, reducing the loss existing between the conical optical receiver and the input optical fiber 22. Figure 1It can be seen that the laser output end face is connected to the hollow spherical photovoltaic receiver 14, and the top small diameter end face of the conical light receiver 21 is used as the laser output end face, which can reduce the area of ​​the inner wall of the hollow spherical photovoltaic receiver 14 occupied by non-photovoltaic cells or non-photovoltaic materials, increase the area of ​​the inner wall of the hollow spherical photovoltaic receiver 14 receiving laser, further increase the photoelectric conversion area, improve the light uniformity and the output power of the laser wireless energy transmission system based on the spectrometer. In this embodiment, the inner side of the conical light receiver is coated with a reflective film, and the specifications of the reflective film can be 808nm, 532nm, 880nm, 1064nm. When the laser hits the inner side of the conical light receiver 21, it will be reflected. After multiple reflections, the laser finally converges on the laser output end face, which improves the transmission efficiency of the laser.

[0026] In this embodiment, the fiber optic splitter includes an input optical fiber 22 and n output optical fibers connected to the input optical fiber 22, and the n output optical fibers are used to divide the laser output from the input optical fiber 22 into n splits of the same light flux. The value of n can be adjusted as needed, and the number of splits can also be rapidly increased as needed. The more split paths there are, the more it can ensure that each area of ​​the spherical photovoltaic receiver can be directly irradiated by the laser, reducing the difference in light intensity between direct irradiation and indirect irradiation, thereby further improving the output power and photoelectric conversion efficiency of the laser wireless energy transmission system based on the splitting device. In this embodiment, the output ends of the n output optical fibers are correspondingly fixed on n splitting brackets 15, and the splitting bracket 15 irradiates the split light emitted from the output end to the 360 / n degree solid angle area in the hollow spherical photovoltaic receiver 14. The input optical fiber 22 and the output optical fiber can be composed of a 50μm / 125μm multimode optical fiber with a numerical aperture of 0.22, or a 62.5μm / 125μm multimode optical fiber with a numerical aperture of 0.22. This embodiment uses a fiber optic splitter to split the laser. Since the volume of the fiber optic splitter is much smaller than the diameter of the hollow sphere, it has little effect on the function of generating uniform light through multiple reflections of the laser in the hollow sphere, and the effect caused by the optical fiber can be ignored.

[0027] The laser propagates in the core of the input optical fiber 22. When the core of another optical fiber is close enough to the core of the input optical fiber 22, the mode field of the laser transmitted in the input optical fiber 22 enters the other optical fiber. The laser is evenly distributed in the two optical fibers, achieving a 1:2 splitting effect. If the laser in each optical fiber is evenly distributed 1:2 again, a total splitting effect of 1:4 can be achieved.

[0028] In some specific embodiments, Figure 2 and Figure 3As shown, when n=360, there are 360 ​​output optical fibers and 360 light splitting brackets 15. The 360 ​​output optical fibers are all fixed as shown in FIG. Figure 3 On the spectrometer bracket shown, the spectrometer bracket has 360 spectrometer brackets installed in a radial distribution outward with its center position as the center of the circle, and one spectrometer bracket is distributed every 1 degree or m degrees of spatial angle. The 360 ​​output optical fibers are correspondingly fixed on the 360 ​​spectrometer brackets, so that the spectrometer bracket radiates laser outward with the center of the hollow sphere as the circle point, and each laser output corresponds to a solid angle of 1 degree, ensuring that each area of ​​the spherical photovoltaic receiver can be directly illuminated by the laser, reducing the difference in light intensity between direct and indirect illumination.

[0029] This embodiment realizes uniform light based on the continuous reflection of light, and does not need to add a special uniform light device. The system has a simple structure, and there is no manufacturing defect of the device that causes the failure of the light uniform function, nor will there be any principle defects of the uniform light device. The light uniform operation is stable and effective. At the same time, this embodiment overcomes the shortcomings and disadvantages of the intensity deviation in the direct area and the reflection area of ​​the hollow spherical photovoltaic receiver. Combining the light splitting device with the hollow spherical photovoltaic receiver will further improve the light uniformity of the receiving end of the laser wireless energy transmission system based on the light splitting device, thereby improving the output power of the system and the photoelectric conversion efficiency of the entire photovoltaic array.

[0030] In some embodiments, the inner wall of the hollow spherical photovoltaic receiver 14 is a hollow sphere made of photovoltaic materials composed of silicon-based photovoltaic cells or one of GaInP / GaAs / Ge, GaInP2 / GaAs / Ge or GaInP / InAs / Ge, and the specification of the photovoltaic material can be 20X20mm. A part of the laser directly irradiated to the hollow spherical photovoltaic receiver 14 is absorbed by the photovoltaic cell or photovoltaic material and generates photocurrent, and a part of it is reflected on the inner wall of the hollow spherical photovoltaic receiver 14, so that the propagation direction of the laser changes and irradiates another position of the inner wall of the hollow spherical photovoltaic receiver 14, and the absorption and reflection processes occur again, and so on and so forth, which is equivalent to the laser being "imprisoned" in a closed cavity, so that the laser is reused on the surface of the photovoltaic cell or photovoltaic material, and the utilization efficiency of the laser is improved. Direct lasers at different positions and their reflected light are superimposed on the inner wall to form a light integration effect, thereby achieving a uniform light effect of the laser on the entire photovoltaic cell, solving the problems of different photocurrents and voltages caused by uneven laser energy distribution, resulting in transmission energy loss and low power output efficiency.

[0031] In some embodiments, the laser wireless energy transmission system based on the spectroscopic device further includes a power manager 16 electrically connected to the hollow spherical photovoltaic receiver 14, and a terminal device 17 electrically connected to the power manager 16. After the laser light is absorbed by the hollow spherical photovoltaic receiver 14 and converted into electrical energy, the MPPT controller of the power manager 16 detects the generated DC voltage and DC current, calculates the output power of the photovoltaic material or photovoltaic cell, realizes the tracking of the maximum power point, and then realizes the maximum power output of the solar panel through the BOOST or BUCK circuit, and finally provides power supply to the terminal device 17.

[0032] In summary, the present invention ensures that each area of ​​the hollow spherical photovoltaic receiver array can be directly irradiated by the laser by using the spectroscopic device to split the laser, thereby reducing the difference in light intensity between direct irradiation and indirect irradiation, and improving and enhancing the uniformity of light. The laser after spectroscopic irradiation utilizes the closed hollow structure of the hollow spherical photovoltaic receiver to generate multiple reflections on the inner wall of the hollow spherical photovoltaic receiver to achieve the effect of light uniformity, and utilizes its airtightness to reuse the energy of the laser, thereby improving the output power and photoelectric conversion efficiency of the laser wireless energy transmission system based on the spectroscopic device.

[0033] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A laser wireless energy transmission system based on a spectroscopic device, characterized in that: It comprises a laser emitting device for emitting laser light, a light splitting device for receiving the laser light and splitting the laser light into n light splits with the same light flux, and a hollow spherical photovoltaic receiver for receiving the light splits and converting the light splits into electric energy, wherein the center of the hollow spherical photovoltaic receiver is provided with n light splitting brackets evenly distributed outward in a radial shape, and the n light splitting brackets are used to fix the output optical fiber of the light splitting device, so that the n light splits with the same light flux correspond to directly irradiate the 360 / n degree solid angle area of ​​the hollow spherical photovoltaic receiver, wherein 2≤n≤360; The optical splitter comprises an optical receiver and an optical fiber splitter connected to the optical receiver, wherein the optical fiber splitter comprises an input optical fiber and n output optical fibers connected to the input optical fiber, wherein the n output optical fibers are used to split the laser light inputted by the input optical fiber into n light beams with the same light flux; The optical receiver is a conical optical receiver, the bottom large-diameter end face of the conical optical receiver is the laser input end face, and the top small-diameter end face of the conical optical receiver is the laser output end face; The output ends of the n output optical fibers are correspondingly fixed on the n light splitting brackets; The laser emitting device comprises a laser for emitting laser light and a beam expander for collimating the laser light.

2. The laser wireless energy transmission system based on the spectroscopic device according to claim 1, characterized in that: A reflective film is provided on the inner side surface of the conical light receiver.

3. The laser wireless energy transmission system based on the spectroscopic device according to claim 1, characterized in that: Said n=360.

4. The laser wireless energy transmission system based on the spectroscopic device according to claim 1, characterized in that: The interior of the hollow spherical photovoltaic receiver is spliced ​​with photovoltaic materials.

5. The laser wireless energy transmission system based on the light splitting device according to claim 4 is characterized in that: The photovoltaic material is one of GaInP / GaAs / Ge, GaInP2 / GaAs / Ge or GaInP / InAs / Ge.

6. The laser wireless energy transmission system based on the spectroscopic device according to claim 1, characterized in that: It also includes an electric energy manager electrically connected to the hollow spherical photovoltaic receiver, and a terminal device electrically connected to the electric energy manager.

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