Handheld chlorophyll monitor

Abstract

The utility model relates to the technical field of chlorophyll monitoring, in particular to a handheld chlorophyll monitor. The plant chlorophyll detector comprises a shell, a handle, a monitoring device and a power supply device, the handle is installed at one end of the shell, the monitoring device is installed at the other end of the shell, and the monitoring device compares reflected light of a plant to be detected with a spectrum, so that chlorophyll detection is completed on the premise that a sample to be detected is not damaged; the power supply device is mounted in the handle and is used for supplying power to the whole chlorophyll detector.

Description

Technical Field

[0001] This utility model relates to the field of chlorophyll monitoring technology, specifically to a handheld chlorophyll monitor. Background Technology

[0002] To design convenient, rapid, and non-destructive methods for chlorophyll content detection, researchers both domestically and internationally have successively employed atomic absorption spectroscopy, hyperspectral spectroscopy, reflectance spectroscopy, multispectral imaging, machine vision, and the absorption characteristics of visible and near-infrared light, achieving good results. However, atomic absorption spectroscopy, hyperspectral spectroscopy, and multispectral imaging require expensive instruments, and the acquired spectral data requires complex calculations to obtain chlorophyll content. Machine vision is significantly affected by lighting conditions, resulting in poor measurement stability. Currently, reflectance spectroscopy is widely used in field measurements. Advanced instruments include the Minolta SPAD-502 (SoilPlant Analysis Development) chlorophyll meter from Japan, the CM-1000 and Oka CCM200 chlorophyll meters from the United States, and the CL-01 chlorophyll meter from the United Kingdom. These instruments can help reduce nitrogen fertilizer use by 10% without reducing crop yield; however, they suffer from drawbacks such as high cost, limited functionality, and chlorophyll content monitoring only at the leaf scale.

[0003] Therefore, the present invention provides a handheld chlorophyll monitor to solve the above problems. Utility Model Content

[0004] The technical problem this utility model aims to solve is as follows: Currently, the most widely used field measurement and research technology is reflectance spectroscopy. Some of the more advanced instruments include the Minolta SPAD-502 (Soil Plant Analysis and Development) chlorophyll meter from Japan, the CM-1000 and Oka CCM200 chlorophyll meters from the United States, and the CL-01 chlorophyll meter from the United Kingdom. These instruments can help reduce nitrogen fertilizer usage by 10% while ensuring that crop yield is not reduced. However, they have shortcomings such as high price and limited functionality, and the chlorophyll content monitoring is only at the leaf scale.

[0005] This utility model provides the following technical solution: a handheld chlorophyll monitor, comprising a shell, a handle, a monitoring device, and a power supply device. The handle is installed at one end of the shell, and the monitoring device is installed at the other end of the shell. The monitoring device compares the reflected light and spectrum of the plant to be tested, thereby realizing the detection of chlorophyll without damaging the sample. The power supply device is installed inside the handle and is used to power the entire chlorophyll monitor.

[0006] Preferably, the monitoring device includes a detection cavity, a filter, a lower cover, a reflective cover, and a countersunk screw. The detection cavity is disposed inside the housing, the filter is installed inside the detection cavity, a lower cover is installed at one end of the filter, a reflective cover is installed inside the lower cover, and the countersunk screw passes through the lower cover array and is installed on the housing.

[0007] Preferably, a cosine corrector is installed on the other side of the filter.

[0008] Preferably, a fixing rod is installed on the lower cover, a toggle lever is installed on the fixing rod, and a sponge is installed on the toggle lever.

[0009] Preferably, the power supply device includes a battery compartment, a battery cover, a countersunk screw, and a power button. The battery compartment is located inside the handle, and a battery cover is provided at one end of the battery compartment. The countersunk screw passes through the battery cover and is installed on the handle. A power button is provided on the outer casing.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. This utility model utilizes a handheld chlorophyll monitor based on photoelectric principles. It selects a sensitive wavelength range for chlorophyll's absorption and strong reflection of sunlight to measure the spectral reflectance of the crop canopy. Based on a model relating the sensitive wavelength reflectance to chlorophyll content, it outputs the average chlorophyll content (LCC) of the top leaves and the canopy chlorophyll content (CCC). This device offers fast detection speed, low cost, simple operation, and good measurement stability, making it significant for guiding crop production. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0014] Figure 2 This is a schematic diagram of the back of the present invention;

[0015] Figure 3 This is a front view of the present invention;

[0016] Figure 4 This is a bottom view of the present invention;

[0017] Figure 5 This is a schematic diagram of the internal structure of the monitoring device of this utility model;

[0018] Figure 6 This is a schematic diagram showing the location of the battery hole in this utility model;

[0019] Figure 7 This is a schematic diagram illustrating the working principle of this utility model.

[0020] In the diagram: 1. Outer shell; 2. Handle; 3. Monitoring device; 31. Detection chamber; 32. Filter; 33. Lower cover; 34. Reflective cover; 35. No. 1 countersunk screw; 36. Cosine corrector; 37. Fixing rod; 38. Actuating rod; 39. Sponge; 4. Power supply device; 41. Battery compartment; 42. Battery cover; 43. No. 2 countersunk screw; 44. Power button. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely represents some embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and "back side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is conventionally placed during use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0024] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] This disclosure aims to address the current widespread use of reflectance spectroscopy in field measurement research. Advanced instruments include the Minolta SPAD-502 (Soil Plant Analysis and Development) chlorophyll meter from Japan, the CM-1000 and Oka CCM200 chlorophyll meters from the United States, and the CL-01 chlorophyll meter from the United Kingdom. These instruments can help reduce nitrogen fertilizer use by 10% without reducing crop yield; however, they suffer from drawbacks such as high price, limited functionality, and the limitation of chlorophyll content monitoring to only the leaf scale. Therefore, this disclosure proposes a handheld chlorophyll monitor based on photoelectric principles. It selects the sensitive wavelength band of chlorophyll's absorption and strong reflection of sunlight to measure the spectral reflectance of the crop canopy. Based on the relationship model between the sensitive wavelength reflectance and chlorophyll content, it outputs the average chlorophyll content (LCC) of the top leaves and the canopy chlorophyll content (CCC). This device offers fast detection speed, low cost, simple operation, and good measurement stability, making it significant for guiding crop production.

[0026] like Figures 1 to 7 As shown, a handheld chlorophyll monitor includes a housing 1, a handle 2, a monitoring device 3, and a power supply 4. The handle 2 is installed at one end of the housing 1, and the monitoring device 3 is installed at the other end of the housing 1. The monitoring device 3 detects chlorophyll by comparing the reflected light and spectrum of the plant to be tested, thereby achieving chlorophyll detection without damaging the sample. The power supply 4 is installed inside the handle 2 and is used to power the entire chlorophyll monitor.

[0027] The aforementioned chlorophyll monitor, based on the photoelectric principle, selects the sensitive wavelength band for chlorophyll's absorption and strong reflection of sunlight to measure the spectral reflectance of the crop canopy. Based on the relationship model between the sensitive wavelength reflectance and chlorophyll content, it outputs the average chlorophyll content (LCC) of the top leaves and the canopy chlorophyll content (CCC). This equipment offers fast detection speed, low cost, simple operation, and good measurement stability, making it of significant importance for guiding crop production.

[0028] like Figures 1 to 6As shown, the monitoring device 3 includes a detection cavity 31, a filter 32, a lower cover 33, a reflective cover 34, and a countersunk screw 35. The detection cavity 31 is located inside the outer casing 1 and is used to house the filter 32. The filter 32 is installed inside the detection cavity 31 and is used to filter some light. The lower cover 33 is installed at one end of the filter 32 and is used to protect and fix the reflective cover 34. The reflective cover 34 is installed inside the lower cover 33 and is used to protect the filter 32. There are five different types of reflective covers 34, which respectively allow light in the 573nm, 680nm, 720nm, 735nm, and 800nm ​​wavelength bands to pass through. The countersunk screw 35 passes through the array of lower covers 33 and is installed on the outer casing 1. The countersunk screw 35 is used to fix the lower cover 33 to the outer casing 1.

[0029] The upward photodiode located inside the outer casing 1 receives incident light intensity from five wavelengths of sunlight (573nm, 680nm, 720nm, 735nm, and 800nm), converting the light signal into an electrical signal via a photoelectric conversion circuit. The downward photodiode receives reflected light intensity from the crop at the same wavelengths, also converting it into an electrical signal via the same photoelectric conversion circuit. The microcontroller unit (MCU) acquires and processes these two electrical signals to obtain the spectral reflectance of the five wavelengths. Based on the relationship model between the reflectance of the sensitive wavelengths and chlorophyll content, it calculates the average chlorophyll content (LCC) of the top leaves and the canopy chlorophyll content (CCC).

[0030] like Figure 2 As shown, a cosine corrector 36 is installed on the other side of the filter 32. The cosine corrector 36 serves to proportionally attenuate the intensity of the incident sunlight, protect the filter 32, and couple and collect light signals from a 180° field of view.

[0031] like Figures 3 to 4 As shown, a fixing rod 37 is installed on the lower cover 33, which is used to fix the actuating rod 38; the actuating rod 38 is installed on the fixing rod 37, which is used to actuate and drive the rotating rod to rotate the sponge wiper 39; the sponge wiper 39 is installed on the actuating rod 38, which is used to rotate and wipe the reflective cover 34 so that light can enter the monitoring device 3 better.

[0032] During operation, staff only need to move lever 38 to wipe the reflective cover 34, which is very convenient and quick.

[0033] like Figures 4 to 6As shown, the power supply device 4 includes a battery compartment 41, a battery cover 42, a countersunk screw 43, and a power button 44. The battery compartment 41 is located inside the handle 2 and is used to hold the battery. The battery cover 42 is provided at one end of the battery compartment 41 and is used to fix the battery inside the battery compartment 41. The countersunk screw 43 passes through the battery cover 42 and is installed on the handle 2. The countersunk screw 43 is used to fix the battery cover 42 on the handle 2. The outer casing 1 is provided with a power button 44, which is used to control the switching on and off of the entire chlorophyll monitor.

[0034] The overall working process is as follows: The staff holds the chlorophyll monitor and aims it at the plant to be tested, then moves the lever 38. The lever 38 drives the sponge 39 to rotate and complete the wiping of the reflective cover 34. Then, the power button is pressed. At this time, the light passes through the reflective cover 34 and the filter 32. At the same time, the upward photodiode located in the outer shell 1 receives the incident light intensity from the five wavelengths of sunlight, namely 573nm, 680nm, 720nm, 735nm, and 800nm. The light signal is converted into an electrical signal through the photoelectric conversion circuit. The downward photodiode receives the reflected light intensity from the crop at the five wavelengths of sunlight, namely 573nm, 680nm, 720nm, 735nm, and 800nm. The light signal is converted into an electrical signal through the photoelectric conversion circuit. The microcontroller unit (MCU) acquires and processes two electrical signals to obtain the spectral reflectance of five bands. Based on the relationship model between the reflectance of sensitive bands and chlorophyll content, the average chlorophyll content (LCC) of the top leaves and the canopy chlorophyll content (CCC) are calculated.

[0035] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A handheld chlorophyll monitor, characterized in that, The device includes a housing (1), a handle (2), a monitoring device (3), and a power supply device (4). The handle (2) is installed at one end of the housing (1), and the monitoring device (3) is installed at the other end of the housing (1). The monitoring device (3) compares the reflected light and spectrum of the plant to be tested, thereby achieving the detection of chlorophyll without damaging the sample. The power supply device (4) is installed inside the handle (2) and is used to power the entire chlorophyll detector.

2. The handheld chlorophyll monitor according to claim 1, characterized in that: The monitoring device (3) includes a detection cavity (31), a filter (32), a lower cover (33), a reflective cover (34), and a countersunk screw (35). The detection cavity (31) is located inside the outer shell (1). The filter (32) is installed inside the detection cavity (31). The lower cover (33) is installed at one end of the filter (32). The reflective cover (34) is installed inside the lower cover (33). The countersunk screw (35) passes through the array of the lower cover (33) and is installed on the outer shell (1).

3. A handheld chlorophyll monitor according to claim 2, characterized in that: A cosine corrector (36) is installed on the other side of the filter (32).

4. A handheld chlorophyll monitor according to claim 3, characterized in that: A fixing rod (37) is installed on the lower cover (33), a toggle rod (38) is installed on the fixing rod (37), and a sponge wiper (39) is installed on the toggle rod (38).

5. A handheld chlorophyll monitor according to claim 4, characterized in that: The power supply device (4) includes a battery compartment (41), a battery cover (42), a countersunk screw (43), and a power button (44). The battery compartment (41) is located inside the handle (2). A battery cover (42) is provided at one end of the battery compartment (41). The countersunk screw (43) passes through the battery cover (42) and is installed on the handle (2). A power button (44) is provided on the outer shell (1).

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