Laser diode agricultural lighting system and method based on combined spectrum

Abstract

The invention relates to the technical field of laser illumination, in particular to a laser diode agricultural illumination system and method based on a combined spectrum, and the system comprises a light source module, an illumination intensity adjustment module, an illumination time control module, a spectrum monitoring module and a feedback adjustment module. According to light quality requirements of leaf vegetables and solanaceous crops in different growth stages, a spectrum combination proportion is determined, a specific wavelength spectrum is supplemented, illumination intensity is dynamically adjusted according to a plant growth state, illumination time is set according to crop types and growth stages, the spectrum is monitored in real time, optimal parameters are compared, and a spectrum combination is adjusted according to deviation. Spectrum, light intensity and illumination time are accurately matched with crop requirements, light energy waste is reduced, it is guaranteed that crops obtain proper illumination conditions in all growth stages, photosynthesis efficiency is promoted to be improved, and efficient and accurate development of agricultural production is promoted.

Description

Technical Field

[0001] This invention relates to the field of laser lighting technology, and in particular to a laser diode agricultural lighting system and method based on combined spectra. Background Technology

[0002] The field of laser lighting technology encompasses various technological systems that use lasers as light sources to achieve lighting functions. It involves multiple aspects, including laser source research and development, optical design, heat dissipation, spectral control, and system integration for different application scenarios. The core of this technology lies in the precise control of key parameters such as laser wavelength, power, and beam quality. This is combined with optical components such as lenses and mirrors to shape, collimate, or focus the laser beam, while simultaneously employing appropriate heat dissipation structures to ensure the long-term stable operation of the laser source. This provides lighting solutions tailored to the needs of various fields. From an overall technological perspective, laser lighting technology, with its high brightness, narrow spectrum, long lifespan, and low power consumption, has been widely applied in industrial lighting, medical lighting, agricultural lighting, and outdoor lighting. In agricultural lighting, it primarily utilizes the spectral characteristics of lasers to meet the specific wavelength light requirements of plants during growth, promoting increased photosynthetic efficiency and driving agricultural production towards higher efficiency and precision.

[0003] One type of laser diode agricultural lighting system based on combined spectrum refers to a system that uses laser diodes as the core light source and combines multiple different wavelengths of spectrum to achieve agricultural lighting functions. It covers the selection and combination of laser diode light sources, the screening and matching of different wavelength spectra, the control method of spectral combination, and the overall structure of the system. Regarding the selection and combination of laser diode light sources, based on the light requirements of plants in agricultural lighting, laser diode light sources with specific power and wavelength output characteristics are selected, and multiple suitable laser diode light sources are combined in a certain arrangement. In terms of the screening and matching of different wavelength spectra, based on the absorption characteristics of different wavelengths of light at different plant growth stages, wavelength spectra beneficial to plant growth, such as red light and blue light, are selected, and the proportion of each wavelength spectrum in the combination is determined. Regarding the control method of the spectrum combination, corresponding circuit control modules are used to control the on / off state and power adjustment of each laser diode light source, thereby achieving precise control of different wavelength spectrum combinations. In terms of the overall system structure, a system structure including a laser diode light source module, a circuit control module, a heat dissipation module, and an optical light output module is designed. The heat dissipation module uses a combination of heat sinks and fans to dissipate the heat generated during the operation of the laser diode light source. The optical light output module uses lenses to converge and homogenize the light emitted by the laser diode light source, ensuring that the light output effect meets the needs of agricultural lighting.

[0004] Existing technologies only select and match spectra and determine proportions based on the basic light requirements of plants, lacking detailed consideration of the light quality requirements of different crops at specific growth stages. They do not monitor spectral changes in real time or have a dynamic feedback adjustment mechanism. Light intensity and time are not precisely linked to the crop growth status. When crops change growth stages or the environment changes, light conditions cannot be adapted in time. For example, after crops enter a new growth stage, the original spectral proportions and light intensity remain unchanged, resulting in insufficient light energy utilization, affecting crop growth rate and quality, and making it difficult to achieve the goal of efficient and precise agricultural production. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and propose a laser diode agricultural lighting system and method based on combined spectrum.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a laser diode agricultural lighting system based on a combined spectrum, the system comprising: a light source module that acquires red light, blue light, and far-red light laser diodes; calls light quality requirement parameters for different growth stages of leafy vegetables and solanaceous crops; determines the combination ratio of red light and blue light and the proportion of far-red light according to the light quality requirements of the two types of crops at their vegetative growth stages; selects combination schemes that meet the requirements; and generates a combined light source. The light intensity adjustment module is based on a combined light source. It uses a plant growth status sensor to detect the growth stage, calls up the light intensity requirement benchmark value, and adjusts the working current of the laser diode to obtain a suitable light intensity. The light time control module uses crop information acquisition devices to obtain plant species and stages based on suitable light intensity, calls up light time standards, sets the start and stop periods of the timer device, and generates a light time control scheme. According to the illumination time control scheme, the spectral monitoring module uses a spectrometer to monitor the spectrum of the combined light source, acquire wavelength data, call the optimal spectral parameters, compare and calculate the differences, and obtain the spectral deviation value. The feedback adjustment module calls the allowable deviation range parameter for the spectral deviation value to determine whether it exceeds the limit. If it does, it determines the adjustment range and obtains the adjusted combined spectral control parameters after adjusting the ratio.

[0007] As a further embodiment of the present invention, the combined light source includes a red laser diode group, a blue laser diode group, and a far-red laser diode group. The suitable illumination intensity is specifically the illumination intensity value corresponding to the adjustment of the laser diode operating current. The illumination time control scheme includes a timer device start-up period and a timer device shutdown period. The spectral deviation value includes the red light wavelength difference value, the blue light wavelength difference value, and the far-red light wavelength difference value. The adjusted combined spectrum includes the adjusted proportion of red laser diodes, the adjusted proportion of blue laser diodes, and the adjusted proportion of far-red laser diodes.

[0008] As a further embodiment of the present invention, the light source module includes a light quality parameter calling submodule, a light source ratio determination submodule, and a combination scheme screening submodule; The light quality parameter calling submodule obtains red laser diodes, blue laser diodes, and far-red laser diodes, calls light quality requirement parameters for different growth stages of leafy vegetables and solanaceous crops, extracts light quality requirement parameters for the vegetative growth stages of the two types of crops, and generates a set of crop vegetative growth light quality parameters. The light source ratio determination submodule determines the combination ratio of red and blue laser diodes based on the crop vegetative growth light quality parameter set, and determines the proportion of far-red laser diodes to be added based on the application requirements of far-red laser diodes, thereby generating light source combination ratio parameters. The combination scheme screening submodule selects combination schemes that meet the light quality requirements of leafy vegetables and solanaceous crops during their vegetative growth stages based on the light source combination ratio parameters, and eliminates schemes that do not meet the light quality requirements, thus obtaining the combined light sources.

[0009] As a further aspect of the present invention, the light intensity adjustment module includes a growth stage detection submodule and a light intensity adjustment submodule; The growth stage detection submodule is based on a combined light source. It detects the current growth stage of the plant through a plant growth status sensor, calls the light intensity requirement benchmark value corresponding to the growth stage, records the benchmark value data, and generates the light benchmark value of the crop growth stage. The light intensity adjustment submodule adjusts the working current of the laser diode according to the light reference value of the crop growth stage, compares the difference between the adjusted light intensity and the reference value, and adjusts the current to match the light intensity reference value to obtain a suitable light intensity.

[0010] As a further embodiment of the present invention, the spectral monitoring module includes a spectral data monitoring submodule and a spectral difference calculation submodule; The spectral data monitoring submodule uses a spectrometer to monitor the spectrum of the combined light source in real time according to the illumination time control scheme, collects wavelength distribution data of the monitored spectrum, organizes wavelength distribution information, and obtains wavelength distribution data of the monitored spectrum. The spectral difference calculation submodule calls the wavelength distribution parameters of the optimal spectrum for crop growth in the greenhouse, compares the monitored spectral wavelength distribution data with the optimal spectral wavelength distribution parameters, calculates the difference in wavelength distribution between the two, and obtains the spectral deviation value.

[0011] As a further embodiment of the present invention, the feedback adjustment module includes a deviation range judgment submodule and a light source ratio adjustment submodule; the deviation range judgment submodule, for the spectral deviation value, calls a preset spectral deviation allowable range parameter, compares the spectral deviation value with the allowable range parameter, determines whether the spectral deviation value is within the allowable range, and generates a spectral deviation judgment result. If the spectral deviation judgment result of the light source ratio adjustment submodule is out of range, the laser diode combination ratio adjustment range is determined based on the spectral deviation value, and the combination ratio of red, blue and far-red laser diodes is adjusted to obtain the adjusted combination spectral control parameters.

[0012] A laser diode agricultural lighting method based on combined spectra, wherein the laser diode agricultural lighting method based on combined spectra is executed based on the aforementioned laser diode agricultural lighting system based on combined spectra, includes the following steps: S1: Combined light source generation acquires red laser diodes, blue laser diodes, and far-red laser diodes, calls the light quality requirements parameters of different growth stages of leafy vegetables and solanaceous crops, determines the combination ratio of red and blue laser diodes according to the light quality requirements of the two types of crops in the vegetative growth stage, determines the proportion of far-red laser diodes to be added, screens combination schemes that meet the light quality requirements, and generates combined light sources. S2: Suitable light intensity acquisition is based on a combination of light sources. The current growth stage of the plant is detected by a plant growth status sensor. The light intensity requirement benchmark value corresponding to the growth stage is called up. The working current of the laser diode is adjusted according to the light intensity requirement benchmark value to obtain the suitable light intensity. S3: The light time control scheme is formulated based on the appropriate light intensity. The plant species and growth stage information are obtained through the crop information acquisition device. The light time standard corresponding to the growth stage of the plant is called up, and the start and stop time periods of the timer device are set according to the light time standard to generate the light time control scheme. S4: Spectral deviation value calculation. Based on the illumination time control scheme, the spectrum of the combined light source is monitored in real time using a spectrometer to obtain the wavelength distribution data of the monitored spectrum. The wavelength distribution parameters of the optimal spectrum for crop growth in the greenhouse are called up. The wavelength distribution difference between the monitored spectrum wavelength distribution data and the wavelength distribution parameters of the optimal spectrum for crop growth is compared, and the wavelength distribution difference value is calculated to obtain the spectral deviation value. S5: Combined spectral control parameter adjustment. For the spectral deviation value, the preset spectral deviation allowable range parameter is called to determine whether the spectral deviation value is within the spectral deviation allowable range. If it exceeds the range, the laser diode combination ratio adjustment range is determined based on the spectral deviation value. The combination ratio of red, blue and far-red laser diodes is adjusted to obtain the adjusted combined spectral control parameters.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are as follows: This invention determines the spectral combination ratio by combining the light quality requirements of leafy vegetables and solanaceous crops at different growth stages, supplements specific wavelength spectra, dynamically adjusts light intensity according to plant growth status, sets light duration according to crop type and growth stage, monitors the spectrum in real time and compares the optimal parameters, and adjusts the spectral combination according to deviations, so that the spectrum, light intensity, light duration and crop needs are precisely matched, reducing light energy waste, ensuring that crops receive suitable light conditions at each growth stage, promoting the improvement of photosynthetic efficiency, and driving the efficient and precise development of agricultural production. Attached Figure Description

[0014] Figure 1 This is an overall flowchart of the lighting system of the present invention; Figure 2 This is a flowchart of the light source module of the present invention; Figure 3 This is a flowchart illustrating the operation of the light intensity adjustment module of the present invention. Figure 4 This is a flowchart of the illumination time control module of the present invention; Figure 5 This is a flowchart illustrating the operation of the spectral monitoring module of the present invention. Figure 6 This is a flowchart of the feedback adjustment module of the present invention; Figure 7 This is an overall flowchart of the lighting method of the present invention. Detailed Implementation

[0015] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0016] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.

[0017] In the embodiments of this invention, the terms "image" and "picture" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning. Similarly, the terms "of," "corresponding (relevant)," and "corresponding" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning.

[0018] In this embodiment of the invention, sometimes a subscript such as W1 may be written in a non-subscript form such as W1. When the difference is not emphasized, the meaning they express is the same.

[0019] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0020] Please see Figure 1 This invention provides a technical solution: a laser diode agricultural lighting system based on combined spectra, the system comprising: The light source module acquires red laser diodes, blue laser diodes, and far-red laser diodes, calls up the light quality requirements parameters of leafy vegetables and solanaceous crops at different growth stages, determines the combination ratio of red and blue laser diodes according to the light quality requirements of the two types of crops at the vegetative growth stage, determines the proportion of far-red laser diodes to be added, screens combination schemes that meet the light quality requirements, and generates a combined light source. The light intensity adjustment module is based on a combined light source. It detects the current growth stage of the plant through a plant growth status sensor, calls up the light intensity requirement benchmark value corresponding to the growth stage, and adjusts the working current of the laser diode according to the benchmark value to obtain a suitable light intensity. The light time control module, based on the appropriate light intensity, obtains information on plant species and growth stage through the crop information acquisition device, calls the light time standard corresponding to the plant at that growth stage, sets the start and stop time periods of the timer device according to the standard, and generates a light time control scheme. According to the illumination time control scheme, the spectral monitoring module uses a spectrometer to monitor the spectrum of the combined light source in real time, obtains the wavelength distribution data of the monitored spectrum, calls the wavelength distribution parameters of the optimal spectrum for crop growth in the greenhouse, compares the wavelength distribution difference between the monitored data and the optimal parameters, calculates the difference value, and obtains the spectral deviation value. The feedback adjustment module calls the preset spectral deviation allowable range parameter for the spectral deviation value to determine whether the deviation value is within the allowable range. If it exceeds the range, it determines the adjustment range of the laser diode combination ratio based on the deviation value, adjusts the ratio, and obtains the adjusted combination spectral control parameters.

[0021] The combined light source includes a red laser diode group, a blue laser diode group, and a far-red laser diode group. The suitable illumination intensity is specifically the illumination intensity value corresponding to the adjustment of the laser diode operating current. The illumination time control scheme includes the start-up period of the timer device and the shutdown period of the timer device. The spectral deviation values ​​include the difference values ​​of red light wavelength, blue light wavelength, and far-red light wavelength. The adjusted combined spectrum includes the adjusted proportion of red laser diodes, the adjusted proportion of blue laser diodes, and the adjusted proportion of far-red laser diodes.

[0022] Please see Figure 2 The light source module includes a light quality parameter calling submodule, a light source ratio determination submodule, and a combination scheme screening submodule; The light quality parameter calling submodule obtains red laser diodes, blue laser diodes, and far-red laser diodes, calls light quality requirement parameters for different growth stages of leafy vegetables and solanaceous crops, extracts light quality requirement parameters for the vegetative growth stages of the two types of crops, and generates a set of crop vegetative growth light quality parameters. The submodule is invoked to first identify the parameter types of red laser diodes, including peak wavelength, optical power density, and spectral half-width; blue laser diodes, including peak wavelength, optical power density, and spectral half-width; and far-red laser diodes, including peak wavelength, optical power density, and spectral half-width. Then, the submodule's built-in parameter database is used to extract the peak wavelength of 660nm and optical power density of 300μmol·m⁻¹ for the red laser diode. -2 ・s -1 The spectral half-width is 10 nm, the peak wavelength of the blue laser diode is 450 nm, and the optical power density is 100 μmol·m⁻¹. -2 ・s -1 The spectral half-width is 15nm, the peak wavelength of the far-infrared laser diode is 730nm, and the optical power density is 50μmol·m⁻¹. -2 ・s -1 The spectrum has a half-width of 20 nm. Then, by accessing databases of light quality requirements for different growth stages of leafy vegetables and solanaceous crops, it was determined that the growth stages of leafy vegetables are divided into germination, vegetative growth, and reproductive growth stages, and the growth stages of solanaceous crops are also divided into germination, vegetative growth, and reproductive growth stages. For the vegetative growth stage of leafy vegetables, the peak wavelength range of red light requirement (650-670 nm) and the light power density requirement range (250-350 μmol·m⁻¹) were retrieved. -2 ・s -1 The required spectral half-width is 8-12nm, the required peak wavelength for blue light is 440-460nm, and the required optical power density is 80-120μmol·m⁻¹. -2 ・s -1 The required spectral half-width is 12-18 nm, the required peak wavelength for far-infrared light is 720-740 nm, and the required optical power density is 40-60 μmol·m⁻¹. -2 ・s -1 The required spectral half-width is 15-25nm. For solanaceous crops during their vegetative growth stage, the required peak wavelength range for red light is 655-665nm, and the required optical power density range is 280-320μmol·m⁻¹. -2 ・s -1 The required spectral half-width is 9-11 nm, the required peak wavelength for blue light is 445-455 nm, and the required optical power density is 90-110 μmol·m⁻¹. -2 ・s -1The required spectral half-width is 13-17nm, the required peak wavelength for far-infrared light is 725-735nm, and the required optical power density is 45-55μmol·m⁻¹. -2 ・s -1 The required spectral half-width is 18-22nm. The required parameters for red, blue, and far-red light at the vegetative growth stages of the two types of crops were matched and verified with the laser diode parameters. It was confirmed that the peak wavelength of the red laser diode, 660nm, falls within the range of 650-670nm for leafy vegetables and 655-665nm for solanaceous crops, with a light power density of 300μmol·m⁻¹. -2 ・s -1 Leafy vegetables 250-350 μmol·m -2 ・s -1 and solanaceous fruits 280-320 μmol·m -2 ・s -1 Within the specified range, the spectral half-width of 10 nm falls within the 8-12 nm range for leafy vegetables and the 9-11 nm range for solanaceous vegetables; the peak wavelength of the blue laser diode at 450 nm falls within the 440-460 nm range for leafy vegetables and the 445-455 nm range for solanaceous vegetables; and the optical power density is 100 μmol·m⁻². -2 ・s -1 Leafy vegetables 80-120 μmol·m -2 ・s -1 And solanaceous fruits 90-110 μmol·m -2 ・s -1 Within the specified range, the spectral half-width of 15 nm falls within the 12-18 nm range for leafy vegetables and the 13-17 nm range for solanaceous vegetables. The peak wavelength of the far-infrared laser diode at 730 nm falls within the 720-740 nm range for leafy vegetables and the 725-735 nm range for solanaceous vegetables. The optical power density is 50 μmol·m⁻². -2 ・s -1 Leafy vegetables 40-60 μmol·m -2 ・s -1 and solanaceous fruits 45-55 μmol·m -2 ・s -1 Within this range, the spectral half-width of 20nm falls within the 15-25nm range for leafy vegetables and the 18-22nm range for solanaceous vegetables. By integrating the laser diode parameters that have been matched above with the light quality requirements parameters for the vegetative growth stages of the two types of crops, a structured dataset is formed that includes crop type, growth stage, red light parameters (peak wavelength, light power density, spectral half-width), blue light parameters (peak wavelength, light power density, spectral half-width), and far-red light parameters (peak wavelength, light power density, spectral half-width), thus generating a set of light quality parameters for crop vegetative growth.

[0023] The light source ratio determination submodule determines the combination ratio of red and blue laser diodes based on the crop vegetative growth light quality parameter set, and determines the proportion of far-red laser diodes to be added based on the application requirements of far-red laser diodes, thereby generating light source combination ratio parameters. The light source ratio determination submodule first extracts the red and blue light power density requirements of leafy vegetables and solanaceous crops during their vegetative growth period from the light quality parameter set of crop vegetative growth. The average red light power density requirement for leafy vegetables is (250+350) / 2 = 300 μmol·m⁻². -2 ・s -1 The average blue light power density requirement is (80+120) / 2 = 100 μmol·m⁻² -2 ・s -1 The average red light power density requirement for solanaceous crops is (280+320) / 2 = 300 μmol·m⁻². -2 ・s -1 The average blue light power density requirement is (90+110) / 2 = 100 μmol·m⁻² -2 ・s -1 The required ratio of red to blue light power density was calculated: 300:100 = 3:1 for leafy vegetables and 300:100 = 3:1 for solanaceous crops. The common value of this ratio for both crop types was taken as the baseline value of 3:1 for the red to blue laser diode combination. The synergistic compatibility of red and blue light parameters under this ratio was then verified. The red light power density was 300 μmol·m⁻¹. -2 ・s -1 With blue light power density of 100 μmol·m -2 ・s -1 The sum of these yields a total optical power density of 400 μmol·m⁻¹. -2 ・s -1 This value falls within the total light power density requirement range of 350-450 μmol·m⁻¹ during the vegetative growth stage of leafy vegetables and solanaceous crops. -2 ・s -1 After confirming the feasibility of the combination ratio, the application requirements of the far-infrared laser diode were addressed. The average far-infrared light power density requirement was extracted from the parameter set, and for leafy vegetables, it was (40+60) / 2=50μmol·m⁻². -2 ・s -1 The solanaceous fruit is (45+55) / 2=50μmol·m -2 ・s -1The calculation benchmark for the proportion of far-red light is set as the total light power density of red and blue light, i.e., the proportion of far-red light = far-red light power density / (red light power density + blue light power density) × 100%. Substituting the values, we get 50 / (300 + 100) × 100% = 12.5%. We verify whether this proportion meets the requirement range of 10%-15% for the proportion of far-red light during the vegetative growth period of the two types of crops. 12.5% ​​is within this range, so we determine that the proportion of far-red laser diodes is 12.5%. By integrating the 3:1 combination ratio of red and blue light and the 12.5% ​​proportion of far-red light, we clarify the power proportion allocation of each light source and generate a light source combination ratio parameter that includes 75% red light, 25% blue light, and 12.5% ​​far-red light (calculated based on the total power of red and blue light).

[0024] The combination scheme screening submodule filters combination schemes that meet the light quality requirements of leafy vegetables and solanaceous crops during their vegetative growth stages based on the light source combination ratio parameters, and eliminates schemes that do not meet the light quality requirements, thus obtaining the combined light sources.

[0025] The combination scheme selection submodule first constructs a basic light source combination scheme library based on the light source combination ratio parameters. This library includes 10 candidate schemes within the range of 70%-80% red light power, 20%-30% blue light power, and 10%-15% far-red light power. The specific parameters for each scheme are as follows: Scheme 1 (70% red, 30% blue, 10% far-red), Scheme 2 (72% red, 28% blue, 11% far-red), Scheme 3 (75% red, 25% blue, 12.5% ​​far-red), Scheme 4 (78% red, 22% blue, 13% far-red), Scheme 5 (80% red, 20% blue, 14% far-red), and Scheme 6 (70% red, 25% blue). The following light quality requirements were selected for leafy vegetables and solanaceous crops: Option 1 (15% far-red light), Option 7 (75% red light, 20% blue light, 11% far-red light), Option 8 (78% red light, 25% blue light, 10% far-red light), Option 9 (72% red light, 30% blue light, 13% far-red light), and Option 10 (80% red light, 28% blue light, 12% far-red light). Key indicators from these parameters were then extracted, including the peak wavelength adaptation ranges for red light, blue light, and far-red light, the power density adaptation ranges for each light source, and the total power density adaptation range. Each candidate option was compared with the required parameters. Option 1, with 70% red light, corresponds to a power density of 280 μmol·m⁻². -2 ・s -1 (Total optical power density 400 μmol·m) -2 ・s -1 ), in leafy vegetables under red light of 250-350 μmol·m -2 ・s -1 and solanaceous fruits 280-320 μmol·m-2 ・s -1 Within the range, 30% of blue light corresponds to 120 μmol·m⁻¹ -2 ・s -1 The concentration of leafy vegetables is 80-120 μmol·m -2 ・s -1 And solanaceous fruits 90-110 μmol·m -2 ・s -1 Upper limit, 10% of far-red light corresponds to 40 μmol·m -2 ・s -1 The content of 40-60 μmol·m⁻² in two types of crops -2 ・s -1 and 45-55 μmol·m -2 ・s -1 The lower limit, but the blue light power density is 120 μmol·m⁻¹. -2 ・s -1 Exceeding the upper limit for solanaceous vegetables by 10 μmol·m -2 ・s -1 The result is deemed unsuitable; Scheme 2, with 72% red light, corresponds to 288 μmol·m⁻¹. -2 ・s -1 28% blue light corresponds to 112 μmol·m -2 ・s -1 Exceeding the upper limit of blue light emitted by solanaceous vegetables by 2 μmol·m -2 ・s -1 This does not meet the requirements; Scheme 3, with 75% red light, corresponds to 300 μmol·m⁻¹. -2 ・s -1 25% blue light corresponds to 100 μmol·m -2 ・s -1 12.5% ​​of far-red light corresponds to 50 μmol·m -2 ・s -1 All parameters are within the suitable range for both types of crops and meet the requirements; Scheme 4, with 78% red light, corresponds to 312 μmol·m⁻¹. -2 ・s -1 22% blue light corresponds to 88 μmol·m -2 ・s -1 It falls within the adaptation range for both types of crops, with 13% far-red light corresponding to 52 μmol·m⁻¹. -2 ・s -1 The requirements are met; Scheme 5, with 80% red light, corresponds to 320 μmol·m⁻¹. -2 ・s -1 20% blue light corresponds to 80 μmol·m -2 ・s -1 14% of far-red light corresponds to 56 μmol·m -2 ・s -1 56 μmol·m-2 ・s -1 Exceeding the upper limit of far-red light of solanaceous fruits by 1 μmol·m -2 ・s -1 This does not meet the requirements; Scheme 6, with 70% red light, corresponds to 280 μmol·m⁻². -2 ・s -1 25% blue light corresponds to 100 μmol·m -2 ・s -1 15% of far-red light corresponds to 60 μmol·m -2 ・s -1 60 μmol·m -2 ・s -1 Exceeding the upper limit for solanaceous vegetables by 5 μmol·m -2 ・s -1 This does not meet the requirements; Scheme 7, with 75% red light, corresponds to 300 μmol·m⁻¹. -2 ・s -1 20% blue light corresponds to 80 μmol·m -2 ・s -1 Below the blue light limit of 10 μmol·m⁻¹ for solanaceous vegetables -2 ・s -1 This does not meet the requirements; Scheme 8, with 78% red light, corresponds to 312 μmol·m⁻¹. -2 ・s -1 25% blue light corresponds to 100 μmol·m -2 ・s -1 10% of far-red light corresponds to 40 μmol·m -2 ・s -1 Below the far-red light limit of solanaceous vegetables by 5 μmol·m⁻¹ -2 ・s -1 This does not meet the requirements; Scheme 9, with 72% red light, corresponds to 288 μmol·m⁻¹. -2 ・s -1 30% blue light corresponds to 120 μmol·m -2 ・s -1 Exceeding the blue light limit of 10 μmol·m⁻¹ for solanaceous vegetables -2 ・s -1 This does not meet the requirements; Scheme 10, with 80% red light, corresponds to 320 μmol·m⁻¹. -2 ・s -1 28% blue light corresponds to 112 μmol·m -2 ・s -1 Exceeding the upper limit of blue light emitted by solanaceous vegetables by 2 μmol·m -2 ・s -1The first eight schemes were not found to be suitable. After eliminating the eight unsuitable schemes, Schemes 3 and 4 were retained. The spectral half-width adaptability of the two schemes was further verified. In Scheme 3, the red light spectral half-width was 10nm, the blue light was 15nm, and the far-red light was 20nm, all of which were within the range required by the two types of crops. Scheme 4 was similarly suitable. Finally, Schemes 3 and 4, which met the requirements, were integrated to obtain the combined light source.

[0026] Please see Figure 3 The light intensity adjustment module includes a growth stage detection submodule and a light intensity adjustment submodule. The growth stage detection submodule is based on a combined light source. It detects the current growth stage of the plant through a plant growth status sensor, calls the light intensity requirement benchmark value corresponding to the growth stage, records the benchmark value data, and generates the light benchmark value of the crop growth stage. The light intensity adjustment submodule adjusts the laser diode's operating current based on the light reference value at the crop growth stage, compares the difference between the adjusted light intensity and the reference value, and adjusts the current to match the light intensity reference value to obtain a suitable light intensity.

[0027] Please see Figure 4 The light duration control module includes a crop information acquisition submodule and a timing scheme setting submodule; The crop information acquisition submodule acquires information on plant species and growth stages through a crop information acquisition device based on suitable light intensity, calls up the light duration standard corresponding to the plant at that growth stage, organizes the standard duration data, and generates the light duration standard for crop growth stages. The growth stage detection submodule, based on the combination of red light (660nm), blue light (450nm), and far-red light (730nm) in a combined light source, activates a plant growth status sensor. This sensor includes an image acquisition unit and a data processing unit. The image acquisition unit continuously captures images of leafy vegetables (such as lettuce), obtaining image data on the number of leaves, plant height, and stem diameter. The data processing unit analyzes the images, extracting the current number of leaves as 6, plant height as 12cm, and stem diameter as 0.8cm. These parameters are compared with preset growth stage classification standards. The classification standards for the vegetative growth stage of lettuce are 4-8 leaves, 8-15cm plant height, and 0.6-1.0cm stem diameter, while the classification standards for the reproductive growth stage are ≥9 leaves, ≥16cm plant height, and ≥1.1cm stem diameter. The module determines that the lettuce is currently in the vegetative growth stage and retrieves the corresponding light intensity requirement benchmark value database. The light intensity requirement benchmark value for the vegetative growth stage of leafy vegetables is set at 300-400 μmol·m⁻². -2 ・s -1 Take the median value of 350 μmol·m -2 ・s -1 As a reference value, this reference value is 350 μmol·m -2 ・s-1 The data is stored in the data recording module to generate the light baseline values ​​for the crop growth stage.

[0028] The timing scheme setting submodule sets the start and stop times of the timing device based on the standard light duration for crop growth stages, verifies the matching of the time period with the standard light duration, adjusts the time period to meet the standard requirements, and generates a light time control scheme.

[0029] The light intensity regulation submodule extracts the light baseline value of 350 μmol·m⁻¹ for crop growth stages. -2 ・s -1 The operating current of a laser diode has a linear relationship with the light intensity. The current-to-light intensity coefficient of a red laser diode is 2 μmol·m⁻¹. -2 ・s -1 / mA, blue light is 1.5μmol·m -2 ・s -1 / mA, far-red light is 1μmol·m -2 ・s -1 / mA, based on the light source combination ratio of 75% red light, 25% blue light, and 12.5% ​​far-red light (based on the total power of red and blue light), the initial operating current is calculated as follows: initial current for red light = (350 × 75%) / 2 = 131.25mA, initial current for blue light = (350 × 25%) / 1.5 ≈ 58.33mA, and initial current for far-red light = (350 × 12.5%) / 1 = 43.75mA. The laser diode operating current is adjusted to the above initial values, and the actual light intensity after adjustment is detected by the light intensity sensor as 330 μmol·m⁻². -2 ・s -1 The calculated difference from the baseline value is 350-330=20μmol·m -2 ・s -1 The difference value is greater than the allowable error of ±5 μmol·m -2 ・s -1 The currents of each light source were adjusted proportionally: Red light adjustment current = 20 × 75% / 2 = 7.5 mA, resulting in a red light current of 131.25 + 7.5 = 138.75 mA; Blue light adjustment current = 20 × 25% / 1.5 ≈ 3.33 mA, resulting in a blue light current of 58.33 + 3.33 ≈ 61.66 mA; Far-red light adjustment current = 20 × 12.5% ​​ / 1 = 2.5 mA, resulting in a far-red light current of 43.75 + 2.5 = 46.25 mA. The actual light intensity was then measured again to be 348 μmol·m⁻². -2 ・s -1 The difference from the benchmark value is 2 μmol·m -2 ・s -1 Once the light intensity is within the allowable error range, stop adjusting to obtain a suitable light intensity of 348 μmol·m⁻².-2 ・s -1 .

[0030] Please see Figure 5 The spectral monitoring module includes a spectral data monitoring submodule and a spectral difference calculation submodule; The spectral data monitoring submodule uses a spectrometer to monitor the spectrum of the combined light source in real time according to the illumination time control scheme, collects wavelength distribution data of the monitored spectrum, organizes wavelength distribution information, and obtains wavelength distribution data of the monitored spectrum. The spectral data monitoring submodule operates based on the light duration control scheme, which stipulates that leafy vegetables receive 12 hours of light daily during their vegetative growth period, with monitoring divided into three time periods: 2 hours, 6 hours, and 10 hours after light exposure. The spectrometer is started and calibrated, with its wavelength detection range set to 400nm-800nm, wavelength resolution to 1nm, and sampling interval to 0.5nm. In the first monitoring period (2 hours after light exposure), the spectrometer probe is aligned with the center of the combined light source's illumination area, 50cm away from the light source's emitting surface, ensuring the probe is completely within the light coverage area. The data acquisition program is then initiated, continuously acquiring 30 sets of spectral data. Each set contains the light intensity value corresponding to 800 wavelength points within the 400nm-800nm ​​range; for example, the light intensity value corresponding to a wavelength of 450nm is 85μmol·m⁻². -2 ・s -1 The light intensity corresponding to a wavelength of 660nm is 255μmol·m. -2 ・s -1 The light intensity corresponding to a wavelength of 730nm is 42μmol·m. -2 ・s -1 The mean of 30 sets of data is calculated, and the final light intensity at each wavelength is the arithmetic mean of the 30 sets of data at that wavelength. For example, the mean at a wavelength of 450nm is (85+83+86+…+84) / 30 = 84.5μmol·m⁻¹. -2 ・s -1 The average wavelength at 660nm is (255+257+253+…+256) / 30 = 255.2 μmol·m -2 ・s -1 The average wavelength at 730nm is (42+43+41+…+42) / 30 = 42.1 μmol·m -2 ・s -1 The mean light intensity data for all wavelengths were organized in ascending order of wavelength, and outliers were removed (intensity values ​​exceeding ±10% of the mean for a given wavelength were considered outliers, e.g., a set of data for a 450nm wavelength was 95 μmol·m⁻¹). -2 ・s -1 Exceeding 84.5 μmol·m -2 ・s -1The upper limit of 10% is 92.95 μmol·m -2 ・s -1 After removing the data and recalculating the mean, a structured data table is formed containing wavelengths from 400nm to 800nm, with each wavelength point corresponding to a unique mean light intensity. This completes the data processing for the first time period. Subsequently, the same process is followed to complete the spectral data collection and processing for 6 hours and 10 hours of illumination. The wavelength distribution information for the three time periods is then summarized to obtain the monitoring spectral wavelength distribution data.

[0031] The spectral difference calculation submodule calls the wavelength distribution parameters of the optimal spectrum for crop growth in the greenhouse, compares the monitored spectral wavelength distribution data with the optimal spectral wavelength distribution parameters, calculates the difference in wavelength distribution between the two, and obtains the spectral deviation value.

[0032] The spectral difference calculation submodule calls the wavelength distribution parameters of the optimal spectrum for leafy vegetables during their vegetative growth stage in greenhouses. These parameters are set based on crop physiological characteristic experimental data, and the standard light intensity value corresponding to the red light core wavelength of 660nm in the optimal spectrum is 260μmol·m⁻¹. -2 ・s -1 Allowable fluctuation range ±5 μmol·m -2 ・s -1 The standard light intensity value corresponding to the core wavelength of blue light at 450nm is 85 μmol·m⁻¹. -2 ・s -1 Allowable fluctuation range ±3 μmol·m -2 ・s -1 The standard light intensity value corresponding to the far-red light core wavelength of 730nm is 45μmol·m⁻¹. -2 ・s -1 Allowable fluctuation range ±2μmol·m -2 ・s -1 The standard light intensity values ​​for non-core wavelengths (400-449nm, 451-659nm, 661-729nm, 731-800nm) were set to not exceed 10% of the standard light intensity value for the core wavelength. The actual light intensity values ​​corresponding to the core wavelengths were extracted from the monitored spectral wavelength distribution data, and were found to be 255.2 μmol·m⁻¹ for 660nm. -2 ・s -1 The actual light intensity at 450nm is 84.5 μmol·m⁻¹. -2 ・s -1 The actual light intensity at 730nm is 42.1 μmol·m⁻¹. -2 ・s -1 Calculate the absolute difference between the actual light intensity and the standard light intensity at each core wavelength. The difference at 660nm is |255.2-260|=4.8μmol·m⁻¹. -2 ・s -1The difference at 450 nm is |84.5-85| = 0.5 μmol·m -2 ・s -1 The difference at 730 nm is |42.1-45| = 2.9 μmol·m -2 ・s -1 The core wavelength weighting coefficients are set as follows: red light 660nm has a weight of 0.5, blue light 450nm has a weight of 0.3, and far-red light 730nm has a weight of 0.2. This is achieved using the formula... Calculate the overall spectral deviation value, where The comprehensive spectral deviation value, , , These are the weighting coefficients for red light, blue light, and far-red light, respectively. , , These are the absolute differences in light intensity at each core wavelength. Substituting them into the numerical calculation yields... Simultaneously, the actual light intensity values ​​of non-core wavelengths are verified, such as the actual light intensity of 420nm being 8.2 μmol·m⁻¹. -2 ・s -1 It did not exceed the red light standard intensity of 260 μmol·m. -2 ・s -1 10% (26 μmol·m -2 ・s -1 The actual light intensity at 600nm is 24.3 μmol·m⁻¹. -2 ・s -1 The intensity did not exceed 10% of the standard red light intensity; the actual intensity at 750nm was 4.1 μmol·m⁻¹. -2 ・s -1 The intensity did not exceed the far-red light standard of 45 μmol·m⁻¹. -2 ・s -1 10% (4.5 μmol·m -2 ・s -1 ), confirming that there is no additional bias effect on non-core wavelengths, and obtaining spectral bias values.

[0033] Please see Figure 6 The feedback adjustment module includes a deviation range judgment submodule and a light source ratio adjustment submodule; The deviation range judgment submodule calls the preset spectral deviation allowable range parameter for the spectral deviation value, compares the spectral deviation value with the allowable range parameter, determines whether the spectral deviation value is within the allowable range, and generates the spectral deviation judgment result. The deviation range determination submodule uses a spectral deviation value of 3.13 μmol·m⁻¹. -2 ・s -1To determine the target, a preset spectral deviation tolerance range parameter is invoked. This parameter is set based on crop spectral tolerance test data. The spectral deviation tolerance range for leafy vegetables during their vegetative growth period is divided into three intervals according to the magnitude of the deviation value, with a deviation value ≤2μmol·m -2 ・s -1 For the fully permissible range, 2 μmol·m -2 ・s -1 < Deviation value ≤ 3.5 μmol·m -2 ・s -1 The deviation is slightly outside the range, with a deviation value > 3.5 μmol·m -2 ・s -1 For deviations significantly exceeding the acceptable range, the allowable range is set with reference to crop photosynthetic efficiency test results. When the deviation value is ≤3.5 μmol·m⁻¹ -2 ・s -1 At that time, the decrease in crop photosynthetic rate did not exceed 5%, which met the actual production requirements. The obtained spectral deviation value was 3.13 μmol·m⁻¹. -2 ・s -1 The parameters were compared one by one with the allowable range parameters, starting with 3.13 μmol·m. -2 ・s -1 With 2 μmol·m -2 ・s -1 The value of 3.13 > 2, indicating it is not within the fully permissible range. Then compare 3.13 μmol·m⁻¹. -2 ・s -1 With 3.5 μmol·m -2 ・s -1 The value of 3.13 < 3.5 indicates a slight deviation from the acceptable range. Record this result, clearly indicating the specific value of the deviation, the corresponding range, and the difference between the deviation and the upper or lower limit of the allowable range, i.e., the difference between 2 μmol·m⁻² and the allowable range. -2 ・s -1 The difference was 1.13 μmol·m -2 ・s -1 , with 3.5 μmol·m -2 ・s -1 The difference was 0.37 μmol·m -2 ・s -1 This information is then integrated to generate a spectral deviation assessment result.

[0034] If the spectral deviation judgment result of the light source ratio adjustment submodule is out of range, the adjustment range of the laser diode combination ratio is determined based on the spectral deviation value. The combination ratio of red, blue and far-red laser diodes is adjusted to obtain the adjusted combination spectral control parameters.

[0035] The light source ratio adjustment submodule receives the spectral deviation judgment result: "Slightly outside the range, deviation value 3.13 μmol·m⁻¹".-2 ・s -1 First, let's break down the composition of the spectral deviation value. The deviation component contributed by red light at 660nm is 0.5 × 4.8 = 2.4 μmol·m⁻¹. -2 ・s -1 The deviation component contributed by blue light at 450nm is 0.3 × 0.5 = 0.15 μmol·m⁻¹. -2 ・s -1 The deviation component contributed by far-red light at 730nm is 0.2 × 2.9 = 0.58 μmol·m⁻¹. -2 ・s -1 The red light deviation component was determined to have the highest proportion and was therefore the primary target for adjustment. The adjustment range was set to be proportional to the deviation component, with the adjustment coefficient K = deviation component / total deviation value × 0.01 (i.e., the adjustment range should not exceed 1% of the original proportion to avoid excessive adjustment affecting spectral stability). The calculated adjustment range for red light was (2.4 / 3.13) × 0.01 ≈ 0.00767, or 0.767%; for blue light, it was (0.15 / 3.13) × 0.01 ≈ 0.00048, or 0.048%; and for far-red light, it was (0.58 / 3.13) × 0.01. 0.01 ≈ 0.00185, or 0.185%. The original laser diode combination ratio was 75% red light, 25% blue light, and 12.5% ​​far-red light (based on the total power of red and blue light). The red light ratio was adjusted by the adjustment range: 75% + 0.767% ≈ 75.77%. The blue light ratio was 25% - 0.048% ≈ 24.95% (the blue light deviation component is small, so it is appropriately lowered to balance the total power). The far-red light ratio was 12.5% ​​+ 0.185% ≈ 12.69%. The target light intensity values ​​of each light source after adjustment were calculated. The target red light intensity = 260 μmol·m⁻¹. -2 ・s -1 Blue light target intensity = 85 μmol·m -2 ・s -1 Far-red target light intensity = 45 μmol·m -2 ・s -1 The total light intensity after adjustment was verified to be 260 + 85 + 45 = 390 μmol·m⁻¹. -2 ・s -1 The total light intensity was 381.8 μmol·m⁻¹. -2 ・s -1The difference is within 5%, which meets the power stability requirements. Then, the adjusted ratio is checked to see if it matches the target light intensity. The red light ratio is 260 / (260+85)×100%≈75.77%, the blue light ratio is 85 / (260+85)×100%≈24.23%. Since the adjustment range of blue light is very small, it is actually set to 24.23%. The far-red light ratio is 45 / (260+85)×100%≈13.04%. The adjustment range of far-red light is corrected to 13.04% to ensure that the sum of each ratio is consistent with the target light intensity ratio. Finally, the adjusted combination ratio is determined to be 75.77% red light, 24.23% blue light, and 13.04% far-red light. The ratio values, adjustment ranges, and calculation basis of each light source are recorded to obtain the adjusted combination spectral control parameters.

[0036] Please see Figure 7 A laser diode-based agricultural lighting method based on combined spectra includes the following steps: S1: Combined light source generation acquires red laser diodes, blue laser diodes, and far-red laser diodes, calls the light quality requirements parameters of different growth stages of leafy vegetables and solanaceous crops, determines the combination ratio of red and blue laser diodes according to the light quality requirements of the two types of crops in the vegetative growth stage, determines the proportion of far-red laser diodes to be added, screens combination schemes that meet the light quality requirements, and generates combined light sources. S2: Suitable light intensity acquisition is based on a combination of light sources. The current growth stage of the plant is detected by a plant growth status sensor. The light intensity requirement benchmark value corresponding to the growth stage is called up. The working current of the laser diode is adjusted according to the light intensity requirement benchmark value to obtain the suitable light intensity. S3: The light time control scheme is formulated based on the appropriate light intensity. The plant species and growth stage information are obtained through the crop information acquisition device. The light time standard corresponding to the growth stage of the plant is called up, and the start and stop time periods of the timer device are set according to the light time standard to generate the light time control scheme. S4: Spectral deviation value calculation. Based on the illumination time control scheme, the spectrum of the combined light source is monitored in real time using a spectrometer to obtain the wavelength distribution data of the monitored spectrum. The wavelength distribution parameters of the optimal spectrum for crop growth in the greenhouse are called up. The wavelength distribution difference between the monitored spectrum wavelength distribution data and the wavelength distribution parameters of the optimal spectrum for crop growth is compared, and the wavelength distribution difference value is calculated to obtain the spectral deviation value. S5: Combined spectral control parameter adjustment. For the spectral deviation value, the preset spectral deviation allowable range parameter is called to determine whether the spectral deviation value is within the spectral deviation allowable range. If it exceeds the range, the laser diode combination ratio adjustment range is determined based on the spectral deviation value. The combination ratio of red, blue and far-red laser diodes is adjusted to obtain the adjusted combined spectral control parameters.

[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A combined spectrum based laser diode agricultural lighting system, characterized by, The system comprises: The light source module acquires red light, blue light, and far-red light laser diodes, calls different growth stage light quality demand parameters of leafy vegetables and solanaceous crops, determines the red light and blue light combination ratio and the far-red light proportion according to the light quality demand of the two types of crops in the vegetative growth stage, screens the combination scheme that meets the demand, and generates a combined light source; The light intensity adjustment module adjusts the working current of the laser diode based on the combined light source, detects the growth stage by using a plant growth state sensor, calls the light intensity demand reference value, and adjusts the working current of the laser diode to obtain the appropriate light intensity; The light time control module acquires the plant type and stage by using a crop information collection device for the appropriate light intensity, calls the light time standard, sets the start and stop time period of the timing device, and generates a light time control scheme; The spectrum monitoring module monitors the spectrum of the combined light source by using a spectrometer according to the light time control scheme, acquires wavelength data, calls the optimal spectrum parameter, compares and calculates the difference, and obtains the spectrum deviation value; The feedback adjustment module calls the deviation allowed range parameter for the spectrum deviation value, judges whether it is exceeded, determines the adjustment amplitude if it is exceeded, and obtains the adjusted combined spectrum control parameter after adjusting the proportion.

2. The combined spectrum based laser diode agricultural lighting system of claim 1, wherein: The combined light source comprises a red light laser diode group, a blue light laser diode group, and a far-red light laser diode group, the appropriate light intensity is specifically the light intensity value corresponding to the working current adjustment of the laser diode, the light time control scheme comprises a timing device start time period and a timing device stop time period, and the spectrum deviation value comprises a red light wavelength difference value, a blue light wavelength difference value, and a far-red light wavelength difference value.

3. The combined-spectrum based laser diode agricultural lighting system of claim 1, wherein: The light source module comprises a light quality parameter calling submodule, a light source ratio determining submodule, and a combination scheme screening submodule; The light quality parameter calling submodule acquires red light laser diodes, blue light laser diodes, and far-red light laser diodes, calls different growth stage light quality demand parameters of leafy vegetables and solanaceous crops, extracts light quality demand parameters of the two types of crops in the vegetative growth stage, and generates a set of crop vegetative growth light quality parameters; The light source ratio determining submodule determines the red light and blue light laser diode combination ratio based on the set of crop vegetative growth light quality parameters, determines the far-red light laser diode addition proportion in combination with the application demand of the far-red light laser diode, and generates light source combination ratio parameters; The combination scheme screening submodule screens the combination scheme that meets the light quality demand of leafy vegetables and solanaceous crops in the vegetative growth stage according to the light source combination ratio parameters, eliminates the schemes that do not meet the light quality demand, and obtains the combined light source.

4. The combined spectrum based laser diode agricultural lighting system of claim 1, wherein: The light intensity adjustment module comprises a growth stage detection submodule and a light intensity adjustment submodule; The growth stage detection submodule detects the current growth stage of the plant by using a plant growth state sensor based on the combined light source, calls the light intensity demand reference value corresponding to the growth stage, records the reference value data, and generates a crop growth stage light reference value. The light intensity adjusting sub-module adjusts the working current of the laser diode according to the light intensity reference value of the crop growth stage, compares the difference between the adjusted light intensity and the reference value, adjusts the current to match the reference value of the light intensity, and obtains the appropriate light intensity.

5. The combined-spectrum based laser diode agricultural lighting system of claim 1, wherein: The spectrum monitoring module includes a spectrum data monitoring sub-module and a spectrum difference calculation sub-module. The spectrum data monitoring sub-module monitors the spectrum of the combined light source in real time using a spectrometer according to a light time control scheme, collects wavelength distribution data of the monitored spectrum, organizes the wavelength distribution information, and obtains the wavelength distribution data of the monitored spectrum. The spectrum difference calculation sub-module calls the wavelength distribution parameters of the optimal spectrum of the crops growing in the facility greenhouse, compares the wavelength distribution data of the monitored spectrum with the wavelength distribution parameters of the optimal spectrum, calculates the wavelength distribution difference value, and obtains the spectrum deviation value.

6. The combined-spectrum based laser diode agricultural lighting system of claim 1, wherein: The feedback adjustment module includes a deviation range judgment sub-module and a light source proportion adjustment sub-module. The deviation range judgment sub-module calls the preset spectrum deviation allowed range parameters according to the spectrum deviation value, compares the spectrum deviation value with the allowed range parameters, judges whether the spectrum deviation value is within the allowed range, and generates a spectrum deviation judgment result.

7. The combined spectrum based laser diode agricultural lighting system of claim 4, wherein: The timing scheme setting sub-module sets the start and stop time period of the timing device according to the light time length standard of the crop growth stage, checks the matching of the time period and the light time length standard, adjusts the time period to meet the standard requirements, and generates a light time control scheme.

8. The combined spectrum based laser diode agricultural lighting system of claim 6, wherein: The light source proportion adjustment sub-module adjusts the combination proportion of the red light, blue light, and far red light laser diodes according to the spectrum deviation value if the spectrum deviation judgment result is out of range, and obtains the adjusted combination spectrum control parameters.

9. A method of laser diode agricultural lighting based on combined spectrum, characterized by, The method is used in the combination spectrum-based laser diode agricultural lighting system of any one of claims 1-8, and includes the following steps: S1: The combined light source generates red light laser diodes, blue light laser diodes, and far red light laser diodes, calls different growth stage light quality demand parameters of leafy crops and solanaceous crops, determines the combination proportion of red light and blue light laser diodes according to the light quality demand of the nutrient growth stage of the two types of crops, determines the proportion of far red light laser diodes, selects a combination scheme that meets the light quality demand, and generates a combined light source; S2: The appropriate light intensity is obtained based on the combined light source, the current growth stage of the plant is detected by a plant growth state sensor, the light intensity demand reference value corresponding to the growth stage is called, the working current of the laser diode is adjusted according to the light intensity demand reference value, and the appropriate light intensity is obtained; S3: The light time control scheme is developed for the appropriate light intensity, the plant type and growth stage information is obtained by a crop information collection device, the light time standard corresponding to the plant and the growth stage is called, the start and stop time period of the timing device is set according to the light time standard, and the light time control scheme is generated; S4: The spectral deviation value is calculated according to the light time control scheme, the spectrometer is used for real-time monitoring of the combined light source spectrum, wavelength distribution data of the monitored spectrum is obtained, wavelength distribution parameters of the best spectrum for crop growth in the facility greenhouse are called, wavelength distribution differences between the wavelength distribution data of the monitored spectrum and the wavelength distribution parameters of the best spectrum for crop growth are compared, wavelength distribution difference values are calculated, and the spectral deviation value is obtained; S5: The combined spectrum regulation parameter is adjusted. The preset spectral deviation allowable range parameter is called for the spectral deviation value, whether the spectral deviation value is within the spectral deviation allowable range is judged, if the range is exceeded, the laser diode combination ratio adjustment amplitude is determined according to the spectral deviation value, the red light, blue light and far-red light laser diode combination ratio is adjusted, and the adjusted combined spectrum regulation parameter is obtained.

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