A laser lighting system for plant factories

Abstract

The present invention relates to the technical field of plant planting supplementary lighting equipment, and in particular to a plant factory laser supplementary lighting system. The system comprises a laser emitter, a control circuit, a lens array, a first reflector array, and a second reflector array; the control circuit is located above the laser emitter, and the lens array is located below the laser emitter; the first reflector array and the second reflector array are respectively located on either side of the laser emitter in the horizontal direction; a collimating lens is provided in the laser emitter; the collimating lens collimates the laser beam into a collimated beam with a divergence angle of less than 0.3°; the bottom surface of the laser emitter and the two emitting ports on the horizontal side can both emit long-wave laser beams and short-wave laser beams; the three laser beams emitted from the laser emitter are respectively reflected by the first reflector array, reflected by the second reflector array, and homogenized by the lens array, and then project a rectangular light spot downward. The system has the advantages of low energy consumption and low cost, and realizes a highly uniform multi-wavelength laser field over a large area at a short distance.

Description

Technical Field

[0001] The present invention relates to the technical field of plant planting light-filling equipment, and in particular to a laser light-filling system for a plant factory. Background Art

[0002] Plant factories achieve stable output year-round through artificially controlled environments, effectively addressing land resource shortages and seasonal restrictions. They employ water-saving and energy-saving technologies to significantly reduce water consumption, while precisely controlling light, temperature, and nutrient solutions to increase yields and ensure food safety. Lighting sources, particularly LEDs, are crucial for plant factories. By simulating natural light, LEDs provide the spectrum necessary for plant growth. Through intelligent regulation, they optimize plant growth cycles and quality, enabling efficient agricultural production. However, LEDs' high energy consumption hinders their large-scale adoption in plant factories.

[0003] Semiconductor lasers, with their advantages in agricultural lighting such as high efficiency and energy saving, long life, and easy control, provide ideal lighting conditions for plant growth. They can emit light of specific wavelengths to promote plant photosynthesis and increase yields. Precise spectral control helps simulate natural light or the lighting requirements of specific growth stages while reducing energy consumption. Among them, plant factory supplemental lighting is a spectral control technology that uses high-power semiconductor lasers as light sources. It requires irradiating specific wavelength lasers with appropriate power density onto crop growth points and fish fillets, and using the coherence of the laser to improve the crop's efficiency in utilizing natural light or LED light energy, thereby achieving efficient regulation of crop growth rate and nutrient accumulation. At the same time, it reduces LED light energy consumption, reducing the overall energy consumption and production costs of the plant factory.

[0004] Currently, the mainstream light source used in plant factories is LED lamps. There are few laser lighting equipment specifically for plant factories, such as laser lighting systems based on diffused optical fibers, artificial light systems based on complex optical paths such as prisms and reflectors, supplementary lighting systems based on multiple light source mixing technology, and laser plant factory supplementary lighting systems based on automatic displacement devices. Although existing agricultural supplementary lighting for plant factories has made great progress in improving light intensity and automation, various problems still exist, as follows:

[0005] The laser lighting system based on diffused optical fiber uses optical components such as focusing mirrors and reflectors to couple multiple beams of multi-wavelength lasers into the optical fiber, which then irradiates the lasers onto crops to stimulate the plant's photosynthetic pigments to react. However, the system has complex structure and high insertion loss of optical components.

[0006] Artificial light systems based on complex optical paths such as prisms and reflectors use a variety of optical lenses to shape and transmit laser beams. However, each optical path requires at least three lenses, resulting in a very complex structure. In addition, the optical path is open and requires a dust-free environment to avoid light energy loss, making it difficult to promote.

[0007] The supplementary lighting system based on multi-light source mixing technology uses multi-wavelength laser light sources or LED light sources to supplement the lighting of crops. A large number of lasers are required to meet the growth needs of crops. The installation cost is high and the engineering workload is large, which cannot meet the demand of plant factories for low-cost light sources.

[0008] The laser plant factory lighting system based on automatic displacement device uses automatically operated guide rails to move laser lights, and uses a small number of laser lights to perform lighting operations on a large area of ​​plants. However, its mechanical structure has problems of wear and poor stability, and has high requirements for the use environment.

[0009] Conventional laser light-filling devices for plant factories typically employ complex mechanical or optical structures, resulting in demanding operating environments, poor stability, and high costs. These issues have severely impacted their application prospects in plant factories. Summary of the Invention

[0010] In order to solve the above problems, the present invention provides a laser light supplement system for a plant factory.

[0011] The present invention aims to provide a plant factory laser supplementary lighting system, comprising a laser emitter, a control circuit, a lens array, a first reflector array, and a second reflector array;

[0012] The control circuit is arranged above the laser emitter, and the lens array is arranged below the laser emitter; the laser emitting device, the first reflector array, and the second reflector array are arranged on the same straight line, and the first reflector array and the second reflector array are respectively arranged on both sides of the laser emitter in the horizontal direction;

[0013] The laser transmitter is provided with a collimating lens; the collimating lens collimates the laser beam into a collimated beam with a divergence angle less than 0.3°;

[0014] The bottom surface of the laser emitter and the emission ports on both sides in the horizontal direction can emit long-wave laser beams and short-wave laser beams; the three laser beams emitted from the laser emitter are reflected by the first reflector array, reflected by the second reflector array, and homogenized by the lens array, and project a rectangular light spot downward.

[0015] Preferably, the laser emitter includes a module housing, a laser emission module, a first horizontal light outlet, a second horizontal light outlet and a lower light outlet;

[0016] The laser emission module is fixed on the top of the module housing; the first horizontal light outlet and the second horizontal light outlet are respectively arranged on both sides of the module housing; the lower light outlet is arranged at the bottom of the module housing;

[0017] A first reflector array is provided in front of the first horizontal light outlet; a second reflector array is provided in front of the second horizontal light outlet.

[0018] Preferably, the laser emitting module is provided with a short-wave horizontal cavity surface emitting laser, a long-wave horizontal cavity surface emitting laser, a package heat sink and a light exit hole on the bottom surface of the emitting laser;

[0019] The short-wave horizontal cavity surface emitting laser and the long-wave horizontal cavity surface emitting laser are packaged on a package heat sink; the laser emission module is fixed to the top of the inner side of the module housing through the package heat sink;

[0020] A first collimating lens is provided on each side of the emission port of the short-wave horizontal cavity surface emitting laser; a second collimating lens is provided on each side of the emission port of the long-wave horizontal cavity surface emitting laser; the curvatures of the first collimating lens and the second collimating lens are different.

[0021] Preferably, the first collimating lens includes a first mirror surface and a second mirror surface, the curvature of the first mirror surface is 0.67±0.2, and the curvature of the second mirror surface is -0.53±0.1; the second collimating lens includes a first mirror surface and a second mirror surface, the curvature of the first mirror surface is 0.92±0.2, and the curvature of the second mirror surface is -0.53±0.1.

[0022] Preferably, the distance between the laser emitter and the first reflector array and the second reflector array is 2-3 meters respectively.

[0023] Preferably, the first reflector array and the second reflector array have the same structure and are both inclined relative to a horizontal plane, so as to project the light beam downward.

[0024] Preferably, the inclination angle of the first reflector array and the second reflector array is 45 degrees.

[0025] Preferably, the laser emitter, the first reflector array and the second reflector array are arranged 0.4 to 0.6 meters above the irradiated plants.

[0026] Preferably, the laser energy projected on the irradiated plants by the laser supplementary lighting system in the plant factory is 0.5 μmol / m 2 / s.

[0027] Preferably, the material of the package heat sink is ceramic.

[0028] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0029] The present invention proposes to use a miniaturized laser device based on a semiconductor laser and a beam shaping lens group to provide low-cost light control technology for three-dimensional planting scenarios such as plant factories, solving the problems of high operating environment requirements, poor stability, and high cost of existing plant factory laser supplementary lighting devices. By adopting a mini laser emission module based on transmission / reflection homogenization technology and a horizontal cavity surface emitting laser, three homogenization mirrors are used to shape the laser beam emitted in three directions by the horizontal cavity surface emitting laser to obtain a rectangular light field, improve the energy uniformity of the beam, and reduce the number of laser devices and lenses used. A large-area light field with an area of ​​more than 5 square meters is formed on the surface of the plant growth rack at a distance of 0.4-0.6 meters, ensuring that all crops receive more than 0.5μmol / m2 / s of laser energy, realizing a high-uniformity multi-wavelength laser field over a large area at close range. In conjunction with the original LED light source of the plant factory, efficient photosynthesis of crops is enabled, thereby improving the yield and quality of crops. Therefore, the present invention provides a low-energy consumption, low-cost laser lighting system for plant factories. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 1 is a schematic diagram of a plant factory laser light supplementation system and its light field distribution according to an embodiment of the present invention.

[0031] Figure 2 This is a front view of a plant factory laser light supplement system and its light field distribution provided according to an embodiment of the present invention.

[0032] Figure 3 Schematic diagram of the collimated light beam of the plant factory laser supplementary lighting system provided according to an embodiment of the present invention.

[0033] Figure 4 Schematic diagram of the structure of a laser transmitter in a plant factory laser light supplementation system according to an embodiment of the present invention.

[0034] Figure 5 3 is a cross-sectional schematic diagram of a laser transmitter in a plant factory laser supplementary lighting system provided according to an embodiment of the present invention.

[0035] Figure 6 The figure is a schematic structural diagram of a reflector array in a plant factory laser light-filling system according to an embodiment of the present invention.

[0036] Figure 7 The figure is a planar schematic diagram of a reflector array in a plant factory laser light-filling system provided according to an embodiment of the present invention.

[0037] Reference numerals:

[0038] 1. Laser emitting device;

[0039] 11. Module housing; 13. First collimating lens; 14. First horizontal light outlet; 15. Second horizontal light outlet; 16. Lower light outlet; 17. Second collimating lens;

[0040] 121. Short-wave horizontal-cavity surface-emitting laser; 122. Long-wave horizontal-cavity surface-emitting laser; 123. Light-emitting hole on bottom surface of emitting laser; 124. Package heat sink;

[0041] 2. Control circuit;

[0042] 3. Lens array;

[0043] 4. The first reflector array;

[0044] 5. Second reflector array;

[0045] 61. First collimated laser beam; 62. Second collimated laser beam; 63. Third collimated laser beam;

[0046] 81. First rectangular light spot; 82. Second rectangular light spot; 83. Third rectangular light spot. DETAILED DESCRIPTION

[0047] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, identical modules are denoted by identical reference numerals. In the case of identical reference numerals, their names and functions are also identical. Therefore, their detailed description will not be repeated.

[0048] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0049] See also Figures 1 to 7 As shown, this embodiment provides a plant factory laser supplementary lighting system, comprising: a laser emitting device 1, a control circuit 2, a lens array 3, a first reflector array 4, and a second reflector array 5;

[0050] The laser emitting device 1 includes a module housing 11, a laser emitting module, a collimating lens 13, a first horizontal light outlet 14, a second horizontal light outlet 15 and a lower light outlet 16;

[0051] The first horizontal light outlet 14 and the second horizontal light outlet 15 are respectively provided on both sides of the module housing 11; the lower light outlet 16 is provided at the bottom of the module housing 11;

[0052] The laser emission module is provided with a short-wave horizontal cavity surface emitting laser 121, a long-wave horizontal cavity surface emitting laser 122 and a light exit hole 123 on the bottom surface of the emitting laser; the short-wave horizontal cavity surface emitting laser 121 and the long-wave horizontal cavity surface emitting laser 122 are packaged on a packaging heat sink 124;

[0053] The laser emission module is fixed to the top of the inner side of the module housing 11 through the package heat sink 124;

[0054] In a specific embodiment, the material of the package heat sink 124 is ceramic, which is used to ensure the sealing and heat dissipation capabilities of the device;

[0055] There are four collimating lenses; a first collimating lens 13 is provided on each side (Y and -Y directions) of the emission port of the short-wave horizontal cavity surface emitting laser 121; a second collimating lens 17 is provided on each side of the emission port of the long-wave horizontal cavity surface emitting laser 122; in a specific embodiment, the first collimating lens 13 includes a first mirror surface and a second mirror surface, the curvature of the first mirror surface is 0.67±0.2, and the curvature of the second mirror surface is -0.53±0.1; the second collimating lens 17 includes a first mirror surface and a second mirror surface, the curvature of the first mirror surface is 0.92±0.2, and the curvature of the second mirror surface is -0.53±0.1;

[0056] The laser emission module can emit long-wave laser beams and short-wave laser beams on both sides of the horizontal direction (Y and -Y directions) and its bottom surface (Z direction).

[0057] The control circuit 2 is arranged above the laser emitting device 1 ; and the lens array 3 is arranged below the lower light outlet 16 .

[0058] The laser emitting device 1, the first reflector array 4 and the second reflector array 5 are arranged on the same straight line;

[0059] The first reflector array 4 is arranged on one side of the first horizontal light outlet 14; the second reflector arrays 5 are respectively arranged on one side of the second horizontal light outlet 15; that is, the first reflector array 4 and the second reflector array 5 are respectively arranged in front of the horizontal light outlets on both sides of the laser emitting device 1.

[0060] The first reflector array 4 and the second reflector array 5 have the same structure. Both the first reflector array 4 and the second reflector array 5 are tilted at an angle of 45 degrees relative to the horizontal plane to project the light beam downward. In a specific embodiment, the first reflector array 4 is tilted at a positive angle of 45 degrees, and the second reflector array 5 is tilted at a negative angle of 45 degrees.

[0061] The first reflector array 4 and the second reflector array 5 are provided with a plurality of reflective units, each of which reflects a portion of the light energy, and the reflected light beams of the plurality of reflective units form a uniform light field ( Figure 6-Figure 7 );

[0062] The first reflector array 4 and the second reflector array 5 can also be replaced by a light homogenizing assembly, which includes a high reflector and a lens group composed of a lens array, and reflects the horizontally transmitted focused light beam to the lens array, which homogenizes it.

[0063] The short-wave horizontal cavity surface emitting laser 121 and the long-wave horizontal cavity surface emitting laser 122 are respectively provided with electrode pins. When direct current is input through the electrode pins, three laser beams with equal energy are emitted in three directions: the two sides (Y and -Y directions) and the light exit hole 123 on the bottom surface of the emitting laser (Z direction). The light beams in the Y and -Y directions are collimated by the first collimating lens 13 and the second collimating lens 17 into collimated beams with divergence angles less than 0.3°, thereby reducing the transmission loss of spatial energy and the area of ​​the light spot formed by the first reflector array 4 and the second reflector array 5.

[0064] Example 1

[0065] This embodiment provides a plant factory laser supplementary lighting system, comprising: a laser emitting device 1, a control circuit 2, a lens array 3, a first reflector array 4, and a second reflector array 5;

[0066] The laser emitting device 1 includes a module housing 11, a laser emitting module, a collimating lens 13, a first horizontal light outlet 14, a second horizontal light outlet 15 and a lower light outlet 16;

[0067] The first horizontal light outlet 14 and the second horizontal light outlet 15 are respectively provided on both sides of the module housing 11; the lower light outlet 16 is provided at the bottom of the module housing 11;

[0068] The laser emission module is provided with a short-wave horizontal cavity surface emitting laser 121, a long-wave horizontal cavity surface emitting laser 122 and a light exit hole 123 on the bottom surface of the emitting laser; the short-wave horizontal cavity surface emitting laser 121 and the long-wave horizontal cavity surface emitting laser 122 are packaged on a packaging heat sink 124;

[0069] The laser emission module is fixed to the top of the inner side of the module housing 11 through the package heat sink 124;

[0070] The material of the package heat sink 124 is ceramic, which is used to ensure the sealing and heat dissipation capability of the device;

[0071] There are four collimating lenses; a first collimating lens 13 is provided on each side (Y and -Y directions) of the emission port of the short-wave horizontal cavity surface emitting laser 121; a second collimating lens 17 is provided on each side of the emission port of the long-wave horizontal cavity surface emitting laser 122; the first collimating lens 13 includes a first mirror surface and a second mirror surface, the first mirror surface curvature is 0.67±0.2, and the second mirror surface curvature is -0.53±0.1; the second collimating lens 17 includes a first mirror surface and a second mirror surface, the first mirror surface curvature is 0.92±0.2, and the second mirror surface curvature is -0.53±0.1;

[0072] The control circuit 2 is arranged above the laser emitting device 1; the lens array 3 is arranged below the lower light outlet 16;

[0073] The laser emitting device 1, the first reflector array 4, and the second reflector array 5 are arranged on the same straight line; the first reflector array 4 and the second reflector array 5 are respectively arranged in front of the horizontal light outlets on both sides of the laser emitting device 1;

[0074] The first reflector array 4 is tilted at a positive 45-degree angle, and the second reflector array 5 is tilted at a negative 45-degree angle. The first reflector array 4 and the second reflector array 5 are provided with a plurality of reflective units, each of which reflects a portion of the light energy, and the reflected light beams of the plurality of reflective units form a uniform light field ( Figure 6-Figure 7 ).

[0075] Example 2

[0076] This embodiment provides a plant factory laser supplementary lighting system, including: a laser emitting device, a control circuit, a lens array, and a light homogenizing component;

[0077] The light homogenizing assembly includes a high reflector and a lens group composed of a lens array. The light homogenizing assembly replaces the reflector array in Example 1 and reflects the horizontally transmitted focused light beam to the lens array, which homogenizes it.

[0078] Structurally, except for the arrangement of the light-homogenizing component, the arrangement of other components is the same as that of Example 1.

[0079] Example 3

[0080] See also Figures 1 to 7 This embodiment provides a plant factory laser supplementary lighting system, comprising: a laser emitting device 1, a control circuit 2, a lens array 3, a first reflector array 4, and a second reflector array 5; the structure is the same as that of embodiment 1;

[0081] The distance between the first reflector array 4 and the second reflector array 5 and the laser emitting device 1 is 2 to 3 meters;

[0082] The laser emitting device 1, the first reflector array 4 and the second reflector array 5 are arranged 0.4 to 0.6 meters above the irradiated plants;

[0083] The laser beam emitted from the lower light outlet 16 of the laser emitting device 1 and the laser beam reflected by the first reflector array 4 and the second reflector array 5 enable the crop to obtain a laser energy exceeding 0.5 μmol / s per square meter;

[0084] The lower light outlet 16 of the laser emitting device 1 emits a first rectangular light spot 81, the first reflector array 4 emits a second rectangular light spot 82, and the second reflector array 5 emits a third rectangular light spot 83; the edges of the first rectangular light spot 81 are superimposed with the light beams of the second rectangular light spot 82 and the third rectangular light spot 83 respectively; the first rectangular light spot 81, the second rectangular light spot 82 and the third rectangular light spot 83 form a large-area light field with an area of ​​more than 5 square meters.

[0085] Three rectangular light spots form a large light field with an area of ​​more than 5 square meters, irradiating the crops and ensuring that 0.5μmol / s per square meter (i.e. 0.5μmol / m 2 / s); the plant factory laser supplementary lighting system achieves a light energy distribution uniformity of more than 80% over a large area at a close distance. Combined with the plant factory's existing LED light source, it activates efficient photosynthesis of crops, thereby improving crop yield and quality.

[0086] Application example: The plant factory laser supplementary lighting system of the present invention is applied to plant factories to illuminate Rosaceae plants, such as strawberries, to achieve the effects of increasing yield by 10%-40%, increasing sugar content by 2-5%, and inhibiting gray mold and anthracnose.

[0087] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present disclosure can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved. This is not limited herein.

[0088] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A plant factory laser light supplement system, characterized by: It includes a laser emitter, a control circuit, a lens array, a first reflector array, and a second reflector array; The control circuit is arranged above the laser emitter, and the lens array is arranged below the laser emitter; the laser emitting device, the first reflector array, and the second reflector array are arranged on the same straight line, and the first reflector array and the second reflector array are respectively arranged on both sides of the laser emitter in the horizontal direction; The laser transmitter is provided with a collimating lens; the collimating lens collimates the laser beam into a collimated beam with a divergence angle less than 0.3°; The bottom surface of the laser emitter and the emission ports on both sides in the horizontal direction can emit long-wave laser beams and short-wave laser beams; the three laser beams emitted from the laser emitter are reflected by the first reflector array, reflected by the second reflector array, and homogenized by the lens array, and project a rectangular light spot downward.

2. The plant factory laser light supplement system according to claim 1, characterized in that: The laser emitter includes a module housing, a laser emission module, a first horizontal light outlet, a second horizontal light outlet and a lower light outlet; The laser emission module is fixed on the top of the module housing; the first horizontal light outlet and the second horizontal light outlet are respectively arranged on both sides of the module housing; the lower light outlet is arranged at the bottom of the module housing; A first reflector array is provided in front of the first horizontal light outlet; a second reflector array is provided in front of the second horizontal light outlet.

3. The plant factory laser light supplement system according to claim 2, characterized in that: The laser emission module is provided with a short-wave horizontal cavity surface emitting laser, a long-wave horizontal cavity surface emitting laser, a packaging heat sink and a light exit hole on the bottom surface of the emitting laser; The short-wave horizontal cavity surface emitting laser and the long-wave horizontal cavity surface emitting laser are packaged on a package heat sink; the laser emission module is fixed to the top of the inner side of the module housing through the package heat sink; A first collimating lens is provided on each side of the emission port of the short-wave horizontal cavity surface emitting laser; a second collimating lens is provided on each side of the emission port of the long-wave horizontal cavity surface emitting laser; the curvatures of the first collimating lens and the second collimating lens are different.

4. The plant factory laser light supplement system according to claim 3, characterized in that: The first collimating lens includes a first mirror surface and a second mirror surface, the curvature of the first mirror surface is 0.67±0.2, and the curvature of the second mirror surface is -0.53±0.1; the second collimating lens includes a first mirror surface and a second mirror surface, the curvature of the first mirror surface is 0.92±0.2, and the curvature of the second mirror surface is -0.53±0.

1.

5. The plant factory laser light supplement system according to claim 1, characterized in that: The distance between the laser emitter and the first reflector array and the second reflector array is 2-3 meters respectively.

6. The plant factory laser light supplement system according to claim 1, characterized in that: The first reflector array and the second reflector array have the same structure and are both inclined relative to a horizontal plane, and are used to project light beams downward.

7. The plant factory laser light supplement system according to claim 6, characterized in that: The inclination angle of the first reflector array and the second reflector array is 45 degrees.

8. The plant factory laser light supplement system according to claim 1, characterized in that: The laser emitter, the first reflector array and the second reflector array are arranged 0.4 to 0.6 meters above the irradiated plants.

9. The plant factory laser light supplement system according to claim 1, characterized in that: The laser energy projected on the irradiated plants by the plant factory laser supplementary lighting system is 0.5 μmol / m 2 / s.

10. The plant factory laser light supplement system according to claim 3, characterized in that: The material of the package heat sink is ceramic.

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