Quantitative measurement and calculation method for light energy absorption amount of plant leaves based on laser light supplement lamp

Abstract

The invention discloses a method for quantitatively measuring and calculating the light energy absorption amount of plant leaves based on a laser light-supplementing lamp, and belongs to the technical field of plant optical detection and analysis. The technical problems that existing light energy absorption detection on plant leaves generally focuses on measurement under standard experiment conditions, cannot adapt to changeable and complex conditions in practical application and still has certain limitation and instability in practical research are solved. The method comprises the following steps: S1, collecting photosynthetically active radiation photon flux density data of plant leaves under an influence factor x; s2, calculating transmissivity and reflectivity of the plant leaves according to the photosynthetically active radiation photon flux density data; s3, correcting the transmissivity of the plant leaf to obtain a corrected transmissivity, and calculating an attenuation coefficient of the plant leaf to the laser based on the corrected transmissivity; and S4, constructing a quantitative measurement and calculation model for the light energy absorption amount of the plant leaf based on the attenuation coefficient of the plant leaf to the laser.

Description

Technical Field

[0001] The present invention belongs to the technical field of plant optical detection and analysis, and in particular relates to a method for quantitatively measuring the light energy absorption of plant leaves based on a laser supplementary light. Background Art

[0002] With the continued growth of the global population and the adverse effects of climate change, agriculture faces significant challenges, including the difficulty in improving crop yields and quality and the pressure of sustainable development. Traditional agriculture mainly relies on natural light, but due to regional differences and seasonal changes, the characteristics of the light source are difficult to accurately control, which restricts the growth of crops. Therefore, how to provide stable and efficient light under different environmental conditions has become an important topic in current agricultural technology research. As an artificial light source with superior performance, laser light source has the characteristics of strong monochromaticity, high controllability, and concentrated light beam, and has gradually become the preferred light source for regulating plant growth. The plant growth environment can be adjusted by changing the wavelength, intensity or irradiation time of the laser, thereby affecting the photosynthesis and growth cycle of the plant.

[0003] The optical properties and related parameters of plant leaves are affected by many factors, including the physical properties of the plant leaves themselves (thickness, area, weight, etc.) as well as environmental factors (temperature, humidity, etc.). By measuring the reflection, transmission, absorption and other data of the interaction between plant leaves and lasers, we can deeply explore the absorption performance of plant leaves to laser light energy under different influencing factors, thus providing a reliable and efficient means for applications such as plant physiology research, ecological environment monitoring, agricultural growth monitoring, and agricultural remote sensing.

[0004] Existing detection of light energy absorption of plant leaves usually focuses on measurements under standard experimental conditions, such as evaluation under ideal environmental conditions. However, in the actual field of plant research, the influencing factors are often complex and changeable. Individual differences in plant leaves (thickness, area, weight, etc.) and influencing factors in the environment (temperature, humidity, etc.) will significantly affect the light energy absorption characteristics of plant leaves to lasers, resulting in the inability of existing technologies to adapt to the changeable and complex conditions in actual applications. In addition, the existing technology has not yet mentioned a representation model under the action of comprehensive multiple variables, and still has certain limitations and instability in actual research. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for quantitatively measuring the light energy absorption of plant leaves based on a laser supplementary light, the method comprising the following steps: S1. Factors affecting collection x The photosynthetically active radiation photon flux density data of the lower plant leaves; S2. Calculating the transmittance and reflectance of plant leaves according to the photosynthetically active radiation photon flux density data; S3, correcting the transmittance of the plant leaves to obtain a corrected transmittance, and calculating the attenuation coefficient of the plant leaves to the laser based on the corrected transmittance; S4. A quantitative calculation model for the light energy absorption of plant leaves is constructed based on the attenuation coefficient of plant leaves to laser.

[0006] Furthermore, the plant leaf photosynthetically active radiation photon flux density data includes incident photosynthetically active radiation photon flux density , transmitted photosynthetically active radiation photon flux density and reflected photosynthetically active radiation photon flux density .

[0007] Further, the transmittance of the plant leaf is given by: Obtain, among which Represents the transmittance of plant leaves.

[0008] Further, the reflectivity of the plant leaves is given by: Obtain, among which Represents the reflectivity of plant leaves.

[0009] Further, the corrected transmittance is given by: Obtain, among which, represents the corrected transmittance, Indicates the proportion of laser light that actually enters the blade.

[0010] Furthermore, the attenuation coefficient of the plant leaf to the laser is given by: Obtain, among which, Represents the attenuation coefficient of plant leaves to laser.

[0011] Furthermore, the quantitative calculation model of the light energy absorption of plant leaves is as follows: Obtain, among which, Influencing factors are The actual amount of laser absorption by plant leaves.

[0012] The beneficial effects of the method described in the present invention are: it can establish an absorption model for laser light supplementary lighting based on consideration of individual differences in plant leaves and environmental influencing factors, thereby providing more accurate data support for plant leaf health monitoring, photosynthesis efficiency evaluation, etc., and has high operability and adaptability in practical applications; it can accurately and quantitatively analyze the energy absorption characteristics of plant leaves under laser light supplementary lighting with high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0014] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0015] Embodiment 1, This embodiment provides a method for quantitatively calculating the light energy absorption of plant leaves based on laser supplementary lighting. Figure 1 As shown, the following steps are included: (1) Collect photosynthetically active radiation photon flux density data of plant leaves. In this step, we first obtain the different influencing factors of plant leaves x The change value of the PPFD meter is used to obtain the change value of the PPFD meter. x Photosynthetically active radiation photon flux density data of plant leaves under laser fixed wavelength: Incident photosynthetically active radiation photon flux density , transmitted photosynthetically active radiation photon flux density , reflected photosynthetically active radiation photon flux density . PPFD: Photosynthetically active radiation photon flux density, which indicates the number of photosynthetically active photons irradiating a unit area per second (unit: μmol·m⁻²·s⁻¹); the main influencing factors of plant leaves x It can be individual characteristics of the leaves (thickness, area, weight, etc.) or environmental factors (temperature, humidity, etc.).

[0016] (2) Calculate the transmittance and reflectance.

[0017] By measuring , , Calculate the transmittance using the following formula , reflectivity : ; ; (3) Calculate the attenuation (absorption) coefficient based on the corrected transmittance.

[0018] Considering that the blade surface reflects the laser to a certain extent, the corresponding reflected part should be eliminated when calculating the light energy actually entering the blade. For this purpose, the corrected transmittance of "only for blade internal attenuation" is defined. , calculated using the following formula: ; in, Indicates the proportion of laser actually entering the blade. It means that after removing the reflection effect, only the transmittance after attenuation inside the plant leaves is considered.

[0019] Combined with the Beer-Lambert law, its basic form is: ; in, represents the transmittance, Represents the attenuation (absorption) coefficient.

[0020] The attenuation (absorption) coefficient is calculated based on the corrected transmittance: ; After taking the logarithm: ' Bring in the above The definition of can get the final attenuation (absorption) coefficient calculation formula: ; In this step, the corrected transmittance after removing the reflection from the blade surface is defined, and combined with the Beer-Lambert law, the attenuation coefficient of the blade to the laser is calculated. This coefficient is used to quantitatively describe the dependence on influencing factors. x The attenuation (absorption) capacity of plant leaves under the laser beam can be used as a key input for subsequent models.

[0021] (4) Construct a quantitative measurement model for light energy absorption.

[0022] When the light beam enters the plant leaves, after removing the light energy reflected from the leaf surface, the light energy entering the leaf is attenuated (absorbed), and the light energy that finally passes through the leaf is expressed as: ; The influencing factors are x The actual absorption of laser by plant leaves is: ; The final model is expressed as: ; When constructing the overall model, represents the incident light energy; Indicates the actual light energy entering the leaf. Indicates the influencing factors, represents the attenuation (absorption) coefficient, It indicates the light energy that finally passes through the leaf after the laser enters the leaf and is attenuated inside the leaf. The unit of this model formula and photosynthetically active radiation photon flux density PPFD is ( ) can be directly used to calculate and analyze the amount of laser light energy absorbed by plant leaves. The result describes the total amount of laser light absorbed by the leaves from the time the light enters the leaves to the time it leaves.

Claims

1. A method for quantitatively calculating the light energy absorption of plant leaves based on laser supplementary lighting, characterized in that: The method comprises the following steps: S1. Factors affecting collection x The photosynthetically active radiation photon flux density data of the lower plant leaves; S2. Calculating the transmittance and reflectance of plant leaves according to the photosynthetically active radiation photon flux density data; S3, correcting the transmittance of the plant leaves to obtain a corrected transmittance, and calculating the attenuation coefficient of the plant leaves to the laser based on the corrected transmittance; S4. A quantitative calculation model for the light energy absorption of plant leaves is constructed based on the attenuation coefficient of plant leaves to laser.

2. The method for quantitatively calculating the light energy absorption of plant leaves based on laser supplementary lighting according to claim 1 is characterized in that: The plant leaf photosynthetically active radiation photon flux density data includes incident photosynthetically active radiation photon flux density , transmitted photosynthetically active radiation photon flux density and reflected photosynthetically active radiation photon flux density .

3. The method for quantitatively calculating the light energy absorption of plant leaves based on laser supplementary lighting according to claim 2 is characterized in that: The transmittance of the plant leaf is given by: Obtain, among which Represents the transmittance of plant leaves.

4. The method for quantitatively calculating the light energy absorption of plant leaves based on laser supplementary lighting according to claim 3 is characterized in that: The reflectivity of the plant leaves is given by: Obtain, among which Represents the reflectivity of plant leaves.

5. The method for quantitatively calculating the light energy absorption of plant leaves based on laser supplementary lighting according to claim 4 is characterized in that: The corrected transmittance is given by: Obtain, among which, represents the corrected transmittance, Indicates the proportion of laser light that actually enters the blade.

6. The method for quantitatively calculating the light energy absorption of plant leaves based on laser supplementary light according to claim 5, characterized in that: The attenuation coefficient of the plant leaf to the laser is given by: Obtain, among which, Represents the attenuation coefficient of plant leaves to laser.

7. The method for quantitatively calculating the light energy absorption of plant leaves based on laser supplementary light according to claim 6, characterized in that: The quantitative calculation model of light energy absorption of plant leaves is as follows: Obtain, among which, Influencing factors are The actual amount of laser absorption by plant leaves.

Images