Laser light supplementing system for plant factory

Abstract

The invention relates to the technical field of plant planting light supplementing equipment, in particular to a laser light supplementing system for a plant factory. Comprising a laser transmitter, a control circuit, a lens array, a first reflector array and a second reflector array, the control circuit is arranged above the laser transmitter, and the lens array is arranged below the laser transmitter; the first reflector array and the second reflector array are arranged on the two sides of the laser transmitter in the horizontal direction respectively. A collimating lens is arranged in the laser transmitter; the collimating lens collimates the laser beam into a collimated beam of which the divergence angle is less than 0.3 degree; long-wave laser beams and short-wave laser beams can be emitted from the bottom surface of the laser emitter and emission ports on the two sides in the horizontal direction; 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 rectangular light spots are projected downwards. The method has the advantages of low energy consumption and low cost; and a short-distance large-area high-uniformity multi-wavelength laser field is realized.

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 all year round by artificially controlling the environment, effectively solving the problems of land resource shortage and seasonal restrictions. It uses water-saving and energy-saving technologies to significantly reduce water resource consumption, while increasing production and ensuring food safety by precisely controlling light, temperature and nutrient solution. Lighting sources, especially LEDs, are crucial to plant factories. LEDs simulate natural light and provide the spectrum required for plant growth. Through intelligent regulation, they optimize plant growth cycles and quality to achieve efficient agricultural production. However, LED light sources have the problem of high energy consumption, making it difficult to apply them on a large scale in plant factories.

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

[0004] At present, the mainstream light source used in plant factories is LED lamps, and there are few laser lighting equipment 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, fill-in lighting systems based on multiple light source mixing technology, and laser plant factory fill-in lighting systems based on automatic displacement devices. Although the existing agricultural fill-in lights used in plant factories have made great progress in improving light intensity and automation, there are still various problems, as follows: 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, and the optical fiber irradiates the lasers onto the crops to stimulate the photosynthetic pigments of the plants to react. However, it has the problems of complex structure and high insertion loss of optical components.

[0005] 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, and the structure is very complex. At the same time, the optical path is open and requires a dust-free environment to avoid light energy loss, which makes it difficult to promote.

[0006] The fill-light system based on multi-light source mixing technology uses multi-wavelength laser light sources or LED light sources to fill-light crops. A large number of lasers are needed 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.

[0007] The laser plant factory lighting system based on automatic displacement device uses an automatically operated guide rail to move the laser light, 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.

[0008] Conventional plant factory laser light-filling devices generally use complex mechanical or optical path structures, and have problems such as high requirements for the use environment, poor stability, and high cost. The above problems seriously affect the application prospects of light-filling devices in plant factories. Summary of the invention

[0009] In order to solve the above problems, the present invention provides a laser lighting system for a plant factory.

[0010] The present invention aims to provide a plant factory laser supplementary lighting system, comprising a laser transmitter, 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; A collimating lens is provided in the laser transmitter; 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 transmitter and the two side emission ports in the horizontal direction can emit long-wave laser beams and short-wave laser beams; the three laser beams emitted from the laser transmitter are respectively 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.

[0011] Preferably, the laser emitter comprises 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 arranged in front of the first horizontal light outlet; a second reflector array is arranged in front of the second horizontal light outlet.

[0012] 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; 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 at each of the two side emission ports of the short-wave horizontal cavity surface emitting laser; a second collimating lens is provided at each of the two side emission ports of the long-wave horizontal cavity surface emitting laser; the first collimating lens and the second collimating lens have different curvatures.

[0013] 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.

[0014] Preferably, the distance between the laser emitter and the first reflector array and the second reflector array is 2-3 meters respectively.

[0015] 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.

[0016] Preferably, the inclination angle of the first reflector array and the second reflector array is 45 degrees.

[0017] Preferably, the laser emitter, the first reflector array and the second reflector array are arranged 0.4-0.6 meters above the irradiated plants.

[0018] Preferably, the laser energy projected on the irradiated plants by the plant factory laser supplementary lighting system is 0.5 μmol / m 2 / s.

[0019] Preferably, the material of the package heat sink is ceramic.

[0020] Compared with the prior art, the present invention can achieve the following beneficial effects: The present invention proposes to use a miniaturized laser equipment based on a semiconductor laser and a beam shaping lens group to provide low-cost light control technology for three-dimensional planting scenes such as plant factories, solving the problems of high use environment requirements, poor stability and high cost of existing laser light supplement devices in plant factories. 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 by the horizontal cavity surface emitting laser in three directions to obtain a rectangular light field, improve the energy uniformity of the light beam, and reduce the number of laser devices and lenses used, forming a large area of ​​light field with an area of ​​more than 5 square meters on the surface of the plant growth rack at a distance of 0.4-0.6 meters, ensuring that all crops obtain more than 0.5μmol / m2 / s of laser energy, and realizing a high-uniformity multi-wavelength laser field over a large area at a close distance, cooperating with the original LED light source of the plant factory, the efficient photosynthesis of crops is started, thereby improving the yield and quality of crops. Therefore, the present invention provides a low-energy consumption and low-cost laser lighting system for plant factories. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall schematic diagram of a plant factory laser supplementary lighting system and its light field distribution provided according to an embodiment of the present invention.

[0022] Figure 2 1 is a front view of a plant factory laser supplementary lighting system and its light field distribution provided according to an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of a collimated light beam of a plant factory laser supplementary lighting system provided according to an embodiment of the present invention.

[0024] Figure 4 It is a schematic diagram of the structure of a laser transmitter in a plant factory laser supplementary lighting system provided according to an embodiment of the present invention.

[0025] Figure 5 It 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.

[0026] Figure 6 The present invention is a schematic structural diagram of a reflector array in a plant factory laser light supplementation system provided in accordance with an embodiment of the present invention.

[0027] Figure 7 It is a plan view schematic diagram of a reflector array in a plant factory laser light supplement system provided according to an embodiment of the present invention.

[0028] Reference numerals: 1. Laser emitting device; 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; 121. Short-wave horizontal cavity surface emitting laser; 122. Long-wave horizontal cavity surface emitting laser; 123. Light exit hole on bottom surface of emitting laser; 124. Package heat sink; 2. Control circuit; 3. Lens array; 4. The first reflector array; 5. The second reflector array; 61. a first collimated laser beam; 62. a second collimated laser beam; 63. a third collimated laser beam; 81. First rectangular light spot; 82. Second rectangular light spot; 83. Third rectangular light spot. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, the detailed description thereof will not be repeated.

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is 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.

[0031] See also Figures 1 to 7 As shown, this embodiment provides a plant factory laser supplementary lighting system, including: 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 laser emitting device 1 comprises 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; The first horizontal light outlet 14 and the second horizontal light outlet 15 are respectively arranged on both sides of the module housing 11; the lower light outlet 16 is arranged at the bottom of the module housing 11; 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 bottom surface light exit hole 123 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; The laser emission module is fixed to the top of the inner side of the module housing 11 through the packaging heat sink 124; 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; There are 4 collimating lenses; a first collimating lens 13 is provided at each of the emission ports on both sides (Y and -Y directions) of the short-wave horizontal cavity surface emitting laser 121; a second collimating lens 17 is provided at each of the emission ports on both sides of the long-wave horizontal cavity surface emitting laser 122; in a specific embodiment, the first collimating lens 13 includes a first mirror and a second mirror, the curvature of the first mirror is 0.67±0.2, and the curvature of the second mirror is -0.53±0.1; the second collimating lens 17 includes a first mirror and a second mirror, the curvature of the first mirror is 0.92±0.2, and the curvature of the second mirror is -0.53±0.1; 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).

[0032] 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 .

[0033] 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 is arranged on one side of the first horizontal light outlet 14; the second reflector arrays 5 are 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 arranged in front of the horizontal light outlets on both sides of the laser emitting device 1.

[0034] The first reflector array 4 and the second reflector array 5 have the same structure. The first reflector array 4 and the second reflector array 5 are both inclined at an angle of 45 degrees relative to the horizontal plane, so as to project the light beam downward. In a specific embodiment, the first reflector array 4 is inclined at a positive angle of 45 degrees, and the second reflector array 5 is inclined at a negative angle of 45 degrees. 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 light energy, and the reflected light beams of the plurality of reflective units form a uniform light field ( Figure 6-Figure 7 ); 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.

[0035] 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. After direct current is input through the electrode pins, three laser beams with the same energy are emitted in three directions: two sides (Y and -Y directions) and the light exit hole 123 on the bottom surface of the emitting laser (Z direction); among them, 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 light beams with a divergence angle less than 0.3°, thereby reducing the transmission loss of spatial energy and the spot area formed by the first reflector array 4 and the second reflector array 5.

[0036] Example 1 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 laser emitting device 1 comprises 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; The first horizontal light outlet 14 and the second horizontal light outlet 15 are respectively arranged on both sides of the module housing 11; the lower light outlet 16 is arranged at the bottom of the module housing 11; 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 bottom surface light exit hole 123 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; The laser emission module is fixed to the top of the inner side of the module housing 11 through the packaging heat sink 124; The material of the package heat sink 124 is ceramic, which is used to ensure the sealing and heat dissipation capacity of the device; There are 4 collimating lenses; a first collimating lens 13 is provided at each of the emission ports on both sides (Y and -Y directions) of the short-wave horizontal cavity surface emitting laser 121; a second collimating lens 17 is provided at each of the emission ports on both sides of the long-wave horizontal cavity surface emitting laser 122; the first collimating lens 13 includes a first mirror and a second mirror, the first mirror curvature is 0.67±0.2, and the second mirror curvature is -0.53±0.1; the second collimating lens 17 includes a first mirror and a second mirror, the first mirror curvature is 0.92±0.2, and the second mirror curvature is -0.53±0.1; The control circuit 2 is arranged above the laser emitting device 1; the lens array 3 is arranged below the lower light outlet 16; 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; 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; a plurality of reflective units are provided in the first reflector array 4 and the second reflector array 5, each of which reflects a portion of light energy, and the reflected light beams of the plurality of reflective units form a uniform light field ( Figure 6-Figure 7 ).

[0037] Example 2 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; The light homogenizing component includes a high reflector and a lens group composed of a lens array. The light homogenizing component replaces the reflector array in Example 1, reflects the horizontally transmitted focused light beam to the lens array, and the lens array homogenizes it. The configuration of the light homogenizing component is different from that of the first embodiment in structure, and the configuration of other components is the same as that of the first embodiment.

[0038] Example 3 See also Figures 1 to 7 This embodiment provides a plant factory laser supplementary lighting system, including: 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; 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; 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; The laser beam emitted from the lower light outlet 16 of the laser emitting device 1 and the laser beam reflected from 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; 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.

[0039] 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 (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 original LED light source of the plant factory, it enables efficient photosynthesis of crops, thereby improving crop yield and quality.

[0040] Application example: The plant factory laser supplementary lighting system of the present invention is applied to plant factories to irradiate Rosaceae plants, such as strawberries, to increase the yield by 10%-40%, increase the sugar content by 2-5%, and inhibit gray mold and anthracnose.

[0041] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the disclosure of the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0042] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plant factory laser lighting 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; A collimating lens is provided in the laser transmitter; 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 transmitter and the two side emission ports in the horizontal direction can emit long-wave laser beams and short-wave laser beams; the three laser beams emitted from the laser transmitter are respectively 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 supplementary lighting system according to claim 1, characterized in that: The laser emitter comprises 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 arranged in front of the first horizontal light outlet; a second reflector array is arranged in front of the second horizontal light outlet.

3. The plant factory laser supplementary lighting 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 at each of the two side emission ports of the short-wave horizontal cavity surface emitting laser; a second collimating lens is provided at each of the two side emission ports of the long-wave horizontal cavity surface emitting laser; the first collimating lens and the second collimating lens have different curvatures.

4. The plant factory laser supplementary lighting 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 supplementary lighting 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 supplementary lighting 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, so as to project light beams downward.

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

9. The plant factory laser supplementary lighting 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 supplementary lighting system according to claim 2, characterized in that: The material of the package heat sink is ceramic.

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