Tree ring density measuring method and measuring device based on high-frequency electromagnetic radiation

Abstract

The invention provides a tree ring density measurement method and device based on high-frequency electromagnetic radiation, and relates to the technical field of density measurement, and the method comprises the steps: placing a tree sample core of a target tree on an acrylic frame for fixing; the surface of the fixed tree sample core is polished, and the annual ring boundary of the tree sample core is confirmed in a wiping mode; scanning the tree core based on a high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree; wherein the high-frequency electromagnetic radiation scanning path is a path perpendicular to an annual ring boundary line of the tree core. According to the method provided by the invention, the tree wheel sample core is placed by using the acrylic frame, so that the stability during grinding can be ensured, the grinding height consistency is ensured, and the density measurement is not influenced; and meanwhile, a clear tree wheel boundary line and a good tree wheel density data effect can be ensured during measurement, a tree wheel sample core is not damaged, and the reliability and the accuracy of data can be ensured by re-observation during later-stage data dating processing.

Description

Technical Field

[0001] The present invention relates to the technical field of density measurement, and in particular to a tree ring density measurement method and device based on high-frequency electromagnetic radiation. Background Art

[0002] Measuring tree-ring density using high-frequency electromagnetic radiation analysis can provide first-hand data for climate change research. This method requires very high surface quality for the core: a smooth, flat, and level surface that must be in close contact with the probe during measurement. Any discrepancy will result in outliers, requiring multiple tests to control for these.

[0003] How to quickly and accurately measure tree ring density is a technical problem that needs to be solved at present. Summary of the Invention

[0004] The present invention provides a tree ring density measurement method and a measurement device based on high-frequency electromagnetic radiation, which are used to solve the defects in the prior art.

[0005] The present invention provides a tree ring density measurement method based on high-frequency electromagnetic radiation, comprising the following steps: Place the tree sample core of the target tree on an acrylic frame for fixation; Polish the surface of the fixed tree core and confirm the annual ring boundaries of the tree core by wiping; The tree sample core is scanned based on a high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree; wherein the high-frequency electromagnetic radiation scanning path is a path perpendicular to the annual ring boundary of the tree sample core.

[0006] According to the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, the material of the acrylic frame is non-conductive transparent acrylic.

[0007] According to a tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, the surface polishing of the fixed tree sample core comprises: The fixed tree sample core was photographed to obtain the initial surface image; When the clarity of the annual ring boundaries of the initial surface image is less than a preset threshold, the surface polishing operation is automatically performed by a preset mechanical robotic arm, and the polished tree sample core is photographed to obtain a polished surface image of the tree sample core.

[0008] According to a tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, the wiping method is: wiping the polished surface of the tree sample core with a wet rag; The method of confirming the annual ring boundaries of the tree core sample by wiping includes: Wiping the polished surface of the tree sample core with a wet rag, and photographing the wiped tree sample core to obtain a target surface image of the tree sample core; Based on the target surface image of the tree sample core, the growth ring boundaries of the tree sample core are confirmed.

[0009] According to a tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, wiping the polished surface of the tree sample core with a wet rag comprises: When the definition of the annual ring boundary of the polished surface image is less than the preset threshold, the polished surface of the tree sample core is wiped with a wet rag.

[0010] According to a tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, the tree sample core is scanned based on the high-frequency electromagnetic radiation scanning path to obtain the tree ring density of the target tree, including: The high-frequency electromagnetic radiation scanning path is determined based on the annual ring boundary of the tree sample core; wherein the high-frequency electromagnetic radiation scanning path is: a path perpendicular to the annual ring boundary of the tree sample core; The tree sample core is scanned based on the high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree.

[0011] According to a tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, the tree ring density of the target tree is determined by multiple high-frequency electromagnetic radiation scanning paths; Scanning the tree sample core based on the high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree includes: Based on the multiple high-frequency electromagnetic radiation scanning paths, the probe is controlled to scan the tree sample core to obtain the annual ring density of the target tree.

[0012] The present invention also provides a tree ring density measurement device based on high-frequency electromagnetic radiation, comprising the following modules: Fixing module: including an acrylic frame and a clamping assembly, used to place the tree sample core of the target tree on the acrylic frame for fixation; Image processing module: includes a camera and image analysis software, used to polish the surface of the fixed tree core and confirm the annual ring boundaries of the tree core by wiping; Scanning control module: used for scanning the tree sample core based on the high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree.

[0013] According to the present invention, the measuring device for a tree ring density measurement method based on high-frequency electromagnetic radiation, the image processing module further includes: Grinding Assist Unit: used to perform automated grinding operations on the surface of tree cores using a pre-set robotic arm.

[0014] According to a measurement device for a tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, the scanning control module includes: Path planning unit: used to determine the high-frequency electromagnetic radiation scanning path according to the annual ring boundaries of the tree sample core provided by the image processing module.

[0015] The present invention provides a tree ring density measurement method and device based on high-frequency electromagnetic radiation. The method comprises placing a tree core sample from a target tree on an acrylic frame for fixation; polishing the surface of the fixed tree core sample, and confirming the tree ring boundaries of the tree core sample by wiping; and scanning the tree core sample based on a high-frequency electromagnetic radiation scanning path to obtain the tree ring density of the target tree; wherein the high-frequency electromagnetic radiation scanning path is a path perpendicular to the tree ring boundaries of the tree core sample. Therefore, the present invention's use of an acrylic frame for placing the tree ring core sample ensures stability during polishing, ensuring a consistent polishing height without affecting density measurement. Furthermore, the measurement ensures clear tree ring boundaries and good tree ring density data, without damaging the tree ring core sample. This allows for further observation during later data processing and dating to ensure data reliability and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a flow chart of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention.

[0018] Figure 2 This is one of the measurement schematic diagrams of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention.

[0019] Figure 3 This is the second measurement schematic diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention.

[0020] Figure 4 This is the third measurement schematic diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention.

[0021] Figure 5 This is the fourth measurement schematic diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention.

[0022] Figure 6 This is the fifth measurement schematic diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention.

[0023] Figure 7 This is the sixth measurement schematic diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention.

[0024] Figure 8 This is the seventh measurement schematic diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention.

[0025] Figure 9 This is the eighth measurement schematic diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention.

[0026] Figure 10 It is a structural schematic diagram of a tree ring density measuring device based on high-frequency electromagnetic radiation provided by the present invention. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0028] The following combination Figures 1-10 The present invention describes a tree ring density measurement method and measurement device based on high-frequency electromagnetic radiation.

[0029] The use of high-frequency electromagnetic radiation analysis to measure tree ring density can provide first-hand data for climate change research. The principle is to use the insulating properties of wood to measure changes in the relative density of tree ring samples by radiating a high-frequency electromagnetic wave. During measurement, the electrode system is in direct contact with the surface of the sample core to be measured, and the radiating end of the electrode will emit a high-frequency electromagnetic wave. The electromagnetic field formed passes through a very small area on the sample to be measured and is received by the receiving end close to the radiating end. The strength of the received signal is affected by the relative insulation constant of the wood, and the relative insulation constant of different wood structures is related to the change in its density. The resulting set of relationships is that as the density of the wood increases, the signal strength received by the electrode also increases, so the relative density of the wood can be determined based on the strength of the received signal. [2]Compared with other tree ring density measurement methods, the high-frequency density method has the advantages of being more convenient, more efficient, and not damaging tree samples when measuring tree ring density.

[0030] Determining tree-ring density using this method requires very high surface quality for the tree core: a smooth, flat, and level surface that must be in close contact with the probe during measurement. Any deviation from this requirement will result in outliers and reduce measurement repeatability, necessitating multiple tests to control these outliers. Consequently, despite the availability of numerous devices in China, this method remains largely unused, leading to idle equipment. Therefore, the present invention proposes a tree-ring density measurement method based on high-frequency electromagnetic radiation to address at least one of these issues.

[0031] Figure 1 FIG. 1 is a flow chart of a tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, such as Figure 1 As shown, the method includes the following: Step 100: Place the tree sample core of the target tree on an acrylic frame for fixation.

[0032] It should be noted that the material of the acrylic frame is non-conductive transparent acrylic.

[0033] Specifically, the tree core is placed on an acrylic stand during measurement. Acrylic, a plastic material, is non-conductive and does not affect density measurement. This improvement addresses the issue of core deformation and ensures the fixed core remains flat and level during measurement.

[0034] Step 200: polish the surface of the fixed tree sample core and confirm the growth ring boundaries of the tree sample core by wiping.

[0035] In step 200, the surface of the fixed tree sample core is polished, including: Step 210: photograph the fixed tree sample core to obtain an initial surface image.

[0036] Step 220: When the definition of the annual ring boundary of the initial surface image is less than a preset threshold, the surface polishing operation is automatically performed by a preset mechanical robotic arm, and the polished tree sample core is photographed to obtain a polished surface image of the tree sample core.

[0037] It should be noted that the wiping method is: using a wet rag to wipe the polished surface of the tree sample core.

[0038] In step 200, the tree core sample is confirmed by wiping the growth ring boundary, including: Step 230 : Wipe the polished surface of the tree sample core with a wet rag, and take a photo of the wiped tree sample core to obtain a target surface image of the tree sample core.

[0039] In step 230, the polished surface of the wood sample core is wiped with a wet cloth, specifically including: When the definition of the annual ring boundary of the polished surface image is less than the preset threshold, the polished surface of the tree sample core is wiped with a wet rag.

[0040] Step 240: confirming the growth ring boundaries of the tree sample core based on the target surface image of the tree sample core.

[0041] It should be noted that the preset machine may be, for example, a grinder or other automated grinding tools.

[0042] Specifically, after the density meter is polished and photographed, due to the tree itself or the polishing reasons, the annual rings are blurred when photographed and identified, and the annual ring boundaries cannot be seen clearly. At this time, use a rag to wipe it and take another photograph to make the annual ring boundaries clear.

[0043] Specifically, when measuring density, the scanning path is perpendicular to the tree-ring boundaries. According to existing methods, the scanning path is positioned horizontally, maintaining the same angle from the core to the bark. This method is feasible for high-quality core samples with vertical growth rings, but most tree-ring boundaries are tilted. If all of them are at the same angle, the density measurement will not have peaks, resulting in problems such as no peaks.

[0044] Step 300: Scan the tree sample core based on a high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree; wherein the high-frequency electromagnetic radiation scanning path is a path perpendicular to the annual ring boundary of the tree sample core.

[0045] Step 300 specifically includes: Step 310: Determine the high-frequency electromagnetic radiation scanning path based on the annual ring boundary of the tree sample core and the inclination angle of the annual ring boundary of the tree sample core; wherein the high-frequency electromagnetic radiation scanning path is: a path perpendicular to the annual ring boundary of the tree sample core.

[0046] Step 320: Scan the tree sample core based on the high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree.

[0047] It should be noted that the annual ring density of the target tree is determined through multiple high-frequency electromagnetic radiation scanning paths.

[0048] Furthermore, step 300 further includes: Step 330: Control the probe to scan the tree sample core based on the multiple high-frequency electromagnetic radiation scanning paths to obtain the annual ring density of the target tree.

[0049] Specifically, by ensuring that the scanning path is perpendicular to the annual ring boundary during the scanning process, the measurement accuracy is improved.

[0050] The tree sample core is scanned sequentially according to multiple parallel high-frequency electromagnetic radiation scanning paths. After completing the measurement of the current scanning path, the probe is lifted and moved to the starting position of the next scanning path in the direction perpendicular to the extension of the annual rings. By integrating the measurement data of all scanning paths, the annual ring density distribution of the target tree is determined.

[0051] The above is a description of the steps of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention. From the description of the above steps, it can be seen that according to the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, the tree sample core of the target tree is placed on an acrylic frame for fixing; the surface of the fixed tree sample core is polished, and the annual ring boundary of the tree sample core is confirmed by wiping; the tree sample core is scanned based on the high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree; wherein the high-frequency electromagnetic radiation scanning path is: a path perpendicular to the annual ring boundary of the tree sample core. It can be seen that the present invention uses an acrylic frame to place the tree ring sample core to ensure stability during polishing, ensure consistent polishing height, and do not affect density measurement; at the same time, the tree ring boundary can be ensured to be clear during measurement, the tree ring density data is good, and the tree ring sample core is not damaged. When the data is processed and dated later, it can be observed again to ensure the reliability and accuracy of the data.

[0052] The following combination Figure 2-Figure 9 , the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention is described.

[0053] 1. Figure 2 This is one of the measurement schematic diagrams of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention. Figure 3 This is the second measurement diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, as shown in FIG. Figure 2 and Figure 3 As shown, first place the collected tree ring sample core into the acrylic clamp, clamp it and measure the sample core height, take ten positions for measurement, enter the measured height (0.5-0.6 higher than the height of the acrylic frame) in the software and then proceed.

[0054] 2. Figure 4 This is the third measurement diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, as shown in FIG. Figure 4As shown, before polishing, take a photo of the sample core to determine its position; Figure 5 This is the fourth measurement diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, as shown in FIG. Figure 5 As shown, after taking the photo, polishing is performed based on the set polishing height to make the surface height consistent. This embodiment does not impose any special restrictions on the specific polishing height. After polishing is completed, take photos again to check whether the sample core photo is clear. Figure 6 This is the fifth measurement diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, as shown in FIG. Figure 6 As shown, the photo taken after polishing shows that the boundaries of the annual rings are blurred. Figure 7 This is the sixth measurement diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, as shown in FIG. Figure 7 As shown, use a wet cloth to gently wipe the surface of the tree ring sample core to make the annual ring boundaries clear and then take another photo. Figure 8 This is the seventh measurement diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, as shown in FIG. Figure 8 As shown in the figure, the boundaries of the annual rings become clearer after wiping. After the surface of the tree ring core is dry, the tree ring density is measured.

[0055] 3. Figure 9 This is the eighth measurement diagram of the tree ring density measurement method based on high-frequency electromagnetic radiation provided by the present invention, as shown in FIG. Figure 9 As shown in the figure, when measuring density, multiple scanning paths should be perpendicular to the annual ring boundary line, and then the density result is obtained.

[0056] The tree-ring density measurement method provided by this invention, based on high-frequency electromagnetic radiation, uses an acrylic stand to hold the tree-ring core, ensuring stability during polishing and a consistent polishing height without affecting density measurement. Furthermore, the measurement ensures clear tree-ring boundaries and good tree-ring density data, without damaging the tree-ring core. This allows for further observation during later data processing and dating to ensure data reliability. The results also demonstrate higher accuracy when compared to the currently widely used DENDRO2003 measurement method.

[0057] The tree ring density measurement device based on high-frequency electromagnetic radiation provided by the present invention is described below. The tree ring density measurement device based on high-frequency electromagnetic radiation described below and the tree ring density measurement method based on high-frequency electromagnetic radiation described above can be referenced to each other.

[0058] Figure 10 Schematic diagram of the structure of the tree ring density measuring device based on high-frequency electromagnetic radiation provided by the present invention, such as Figure 10 As shown, the tree ring density measuring device based on high-frequency electromagnetic radiation provided by the present invention includes: Fixing module 1001: includes an acrylic frame and a clamping assembly, used to place the tree sample core of the target tree on the acrylic frame for fixation; Image processing module 1002: includes a camera and image analysis software, and is used to polish the surface of the fixed tree core sample and confirm the annual ring boundaries of the tree core sample by wiping; The scanning control module 1003 is configured to scan the tree sample core based on a high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree.

[0059] Based on the above embodiment, in this embodiment, the image processing module 1002 further includes: Grinding Assist Unit: used to perform automated grinding operations on the surface of tree cores using a pre-set robotic arm.

[0060] Based on the above embodiment, in this embodiment, the scanning control module 1003 includes: Path planning unit: used to determine the high-frequency electromagnetic radiation scanning path according to the annual ring boundaries of the tree sample core provided by the image processing module.

[0061] The tree ring density measuring device based on high-frequency electromagnetic radiation provided by the present invention has a non-conductive acrylic frame that can avoid damage to the sample core surface and ensure the originality of the measurement data; the grinding operation (with preset pressure and speed) is performed by a robotic arm to eliminate the uneven force problem of manual grinding and ensure the consistency of surface flatness; the surface state is detected in real time after grinding, and subsequent processing steps (such as whether secondary grinding or wiping is required) are dynamically adjusted to improve process efficiency; in complex environments (such as vibration or temperature fluctuations), the dynamic calibration unit can quickly respond and correct path deviations, thereby improving the environmental adaptability of the device.

[0062] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for measuring tree ring density based on high-frequency electromagnetic radiation, characterized in that: include: Place the tree sample core of the target tree on an acrylic frame for fixation; Polish the surface of the fixed tree core and confirm the annual ring boundaries of the tree core by wiping; The tree sample core is scanned based on a high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree; wherein the high-frequency electromagnetic radiation scanning path is a path perpendicular to the annual ring boundary of the tree sample core.

2. The tree ring density measurement method based on high-frequency electromagnetic radiation according to claim 1, characterized in that: The acrylic frame is made of non-conductive transparent acrylic.

3. The tree ring density measurement method based on high-frequency electromagnetic radiation according to claim 1, characterized in that: The surface polishing of the fixed tree sample core comprises: The fixed tree sample core was photographed to obtain the initial surface image; When the clarity of the annual ring boundaries of the initial surface image is less than a preset threshold, the surface polishing operation is automatically performed by a preset mechanical robotic arm, and the polished tree sample core is photographed to obtain a polished surface image of the tree sample core.

4. The tree ring density measurement method based on high-frequency electromagnetic radiation according to claim 3, characterized in that: The wiping method is: using a wet rag to wipe the polished surface of the tree sample core; The method of confirming the annual ring boundaries of the tree core sample by wiping includes: Wiping the polished surface of the tree sample core with a wet rag, and photographing the wiped tree sample core to obtain a target surface image of the tree sample core; Based on the target surface image of the tree sample core, the growth ring boundaries of the tree sample core are confirmed.

5. The tree ring density measurement method based on high-frequency electromagnetic radiation according to claim 4, characterized in that: The method of wiping the polished surface of the wood sample core with a wet rag includes: When the definition of the annual ring boundary of the polished surface image is less than the preset threshold, the polished surface of the tree sample core is wiped with a wet rag.

6. The tree ring density measurement method based on high-frequency electromagnetic radiation according to claim 5, characterized in that: Scanning the tree sample core based on a high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree includes: The high-frequency electromagnetic radiation scanning path is determined based on the annual ring boundary of the tree sample core; wherein the high-frequency electromagnetic radiation scanning path is: a path perpendicular to the annual ring boundary of the tree sample core; The tree sample core is scanned based on the high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree.

7. The tree ring density measurement method based on high-frequency electromagnetic radiation according to claim 6, characterized in that: The annual ring density of the target tree is determined by multiple high-frequency electromagnetic radiation scanning paths; Scanning the tree sample core based on the high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree includes: Based on the multiple high-frequency electromagnetic radiation scanning paths, the probe is controlled to scan the tree sample core to obtain the annual ring density of the target tree.

8. A measuring device for the tree ring density measurement method based on high-frequency electromagnetic radiation according to any one of claims 1 to 7, characterized in that: The device comprises: Fixing module: including an acrylic frame and a clamping assembly, used to place the tree sample core of the target tree on the acrylic frame for fixation; Image processing module: includes a camera and image analysis software, used to polish the surface of the fixed tree core and confirm the annual ring boundaries of the tree core by wiping; Scanning control module: used for scanning the tree sample core based on the high-frequency electromagnetic radiation scanning path to obtain the annual ring density of the target tree.

9. The measuring device according to claim 8, characterized in that The image processing module further includes: Grinding Assist Unit: used to perform automated grinding operations on the surface of tree cores using a pre-set robotic arm.

10. The measuring device according to claim 8, characterized in that The scanning control module includes: Path planning unit: used to determine the high-frequency electromagnetic radiation scanning path according to the annual ring boundaries of the tree sample core provided by the image processing module.

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