Lining monitoring method based on thermochromic material
By using thermochromic material processing technology on the lining surface, combining thermal imaging and image acquisition equipment to identify cracks and blocks, the problem of inaccurate identification in traditional monitoring methods is solved, and more efficient monitoring and early warning is achieved.
Patent Information
- Application Number
- CN202411644929.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-03-11
AI Technical Summary
Traditional lining image monitoring methods are difficult to accurately identify cracks and blocks, resulting in low warning accuracy and high monitoring costs.
The monitoring method based on thermochromic materials is adopted to identify the low-value areas of thermal radiation through the thermal imager, and the thermochromic material processing is carried out. The image acquisition device is used to collect images and identify the discoloration information of the thermochromic material area to obtain the information of cracks and block drops.
The recognition ability of cracks and blocks in lining images is improved, the problem of inaccurate identification in traditional methods is solved, and more accurate early warning and monitoring is achieved.
Smart Images
Figure CN119600441A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of monitoring technology, in particular to a lining monitoring method based on thermochromic materials. Background Art
[0002] The causes of block loss in tunnel and large underground cavern linings are very complex. The location and size of the block loss are highly random. Traditional single-point measurement results such as displacement and crack monitoring are often lacking in representativeness, resulting in low early warning accuracy or high monitoring costs. At the same time, the process of block loss and instability is relatively rapid, which is prone to safety hazards. Therefore, the monitoring method for block loss in tunnel linings should preferably use surface monitoring, such as image measurement, but conventional surface monitoring is not easy to identify cracks or block loss. The causes include: 1. The area covered by a single image device is often relatively large, requiring dozens of square meters, and the crack width is often small, with most cracks less than 1mm; this causes a single crack to be less than one pixel in the image, making it difficult to identify; 2. The lining color is often gray, and the grayscale depth depends on the concrete ground material, which is highly random; the contrast features of cracks and block loss on the image after generation are not significant.
[0003] Therefore, in the image monitoring of lining, how to improve the image performance characteristics of cracks and the image recognition ability of local random block drop is a technical difficulty in tunnel lining monitoring. Summary of the invention
[0004] Technical problem solved by the present invention: The present invention provides a lining monitoring method based on thermochromic materials to solve the problem of inaccurate crack identification in existing lining images.
[0005] The technical solution adopted by the present invention to solve the above technical problems is: a lining monitoring method based on thermochromic materials, comprising the following steps:
[0006] S1. Use a thermal imager to image and identify the lining surface to obtain low-value areas of thermal radiation;
[0007] S2. treating the lining surface of the low-value thermal radiation area with a thermochromic material to obtain an area treated with the thermochromic material;
[0008] S3, using an image acquisition device to acquire an image of the lining surface, wherein the image of the lining surface includes an area treated with a thermochromic material;
[0009] S4. Obtaining information on cracks on the lining surface by identifying information on the discolored area of the area treated with the thermochromic material.
[0010] Furthermore, the treatment of the lining surface in the low-value thermal radiation area with a thermochromic material includes surface pasting or spraying.
[0011] Furthermore, the thermochromic material is selected according to the crack recognition ability coefficient of the image acquisition device, so that the low value of thermal radiation caused by the crack change causes the color change width of the thermochromic material in the lining surface image acquired by the image acquisition device to be not less than 1 pixel. The calculation formula of the crack recognition ability coefficient is: Wherein N represents the crack recognition ability coefficient, W1 represents the color change width of the thermochromic material in the masonry surface image acquired by the image acquisition device, and W represents the crack width.
[0012] Furthermore, the information of the color change area of the area treated with the thermochromic material includes length, width, number or shape, and the information of the cracks on the lining surface includes length, width, number or shape of the cracks.
[0013] Furthermore, the lining monitoring method based on thermochromic materials also includes: issuing early warnings based on information on cracks on the lining surface.
[0014] Furthermore, S1 also includes surface treatment of the area on the lining surface that is prone to chipping, so that the color of the area that is prone to chipping is inconsistent with the color of the lining surface. The lining surface image in S3 also includes the area that is prone to chipping. S4 also includes obtaining lining chipping by identifying the color change of the area that is prone to chipping.
[0015] Furthermore, the area prone to block falling includes areas with dense cracks, areas with dislocated cracks and areas where cracks are closed into rings.
[0016] Furthermore, the information of the color change area in the area prone to chipping includes position, quantity or area, and the information of the lining chipping includes position, quantity or area.
[0017] Furthermore, the lining monitoring method based on thermochromic materials also includes: issuing an early warning based on information on lining block falling.
[0018] Beneficial effects of the invention: The invention provides a lining monitoring method based on thermochromic materials, which uses a thermal imager to perform imaging and identification on the lining surface to obtain a low-value thermal radiation area, treats the lining surface in the low-value thermal radiation area with a thermochromic material, and uses an image acquisition device to acquire a lining surface image, wherein the lining surface image includes an area treated with the thermochromic material, and information on cracks on the lining surface is obtained by identifying information on the discolored area of the area treated with the thermochromic material, thereby reflecting the information on the cracks using the information on the thermochromic material area, thereby solving the problem of inaccurate crack identification in existing lining images. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic flow chart of a lining monitoring method based on thermochromic materials provided by the present invention;
[0020] Figure 2 This is a schematic diagram of a thermochromic material treatment area in a lining monitoring method based on thermochromic materials provided by the present invention; wherein 1 represents a crack, 2 represents a low-value thermal radiation area, 3 represents a thermochromic material treatment area, and 4 represents a lining surface. DETAILED DESCRIPTION
[0021] The present invention aims at the problem that lining cracks are too small, so that the cracks in conventional lining images are less than 1 pixel, making it impossible to identify the cracks, resulting in inaccurate lining image recognition. The present invention provides a lining monitoring method based on thermochromic materials, the principle of which is: there is a low temperature area or a low thermal radiation value area at the crack, especially a penetrating crack. By treating the lining surface in the low thermal radiation value area with thermochromic materials, the changes in the cracks are converted into changes in the thermochromic material area, that is, there is a significant color difference from the low thermal radiation value area to the constant temperature area, thereby expanding the influence of the cracks in the lining image, thereby improving the recognition ability of the cracks. Therefore, the information of the cracks on the lining surface can be obtained by identifying the information of the color change area of the area treated with thermochromic materials, thereby solving the problem of inaccurate crack recognition in the existing lining images.
[0022] The present invention provides a lining monitoring method based on thermochromic materials, such as Figure 1 As shown, the following steps are included:
[0023] S1. Use a thermal imager to image and identify the lining surface to obtain low-value areas of thermal radiation;
[0024] Specifically, for a complete lining surface, the thermal radiation obtained by thermal imaging is the same, that is, a constant temperature zone. If there are cracks, the thermal radiation at the cracks is lower than that at the constant temperature zone, that is, a low-value thermal radiation zone. Therefore, the lining surface can be imaged and identified by a thermal imager to obtain a low-value thermal radiation zone.
[0025] S2, treating the lining surface of the low-value thermal radiation area with a thermochromic material to obtain an area treated with the thermochromic material;
[0026] Specifically, the thermochromic material treatment of the lining surface in the low-value thermal radiation area includes surface pasting or spraying. In particular, in order to save thermochromic materials, only the low-value thermal radiation area corresponding to the crack width can be treated with thermochromic materials, such as Figure 2 As shown, 1 represents cracks, 2 represents low-value thermal radiation areas, 3 represents thermochromic material-treated areas, and 4 represents lining surfaces. In order to better show the changes in cracks 1, the thermochromic material-treated areas 3 may also appropriately extend beyond the low-value thermal radiation areas 2.
[0027] S3, using an image acquisition device to acquire an image of the lining surface, wherein the image of the lining surface includes an area treated with a thermochromic material;
[0028] S4. Obtaining information on cracks on the lining surface by identifying information on the discolored area of the area treated with the thermochromic material.
[0029] Specifically, the information of the color change area of the area treated with the thermochromic material includes length, width, number or shape, and the information of the cracks on the lining surface includes length, width, number or shape of the cracks.
[0030] In particular, the thermochromic material can be selected according to the crack recognition ability coefficient of the image acquisition device, so that the low value of thermal radiation caused by the crack change causes the color change width of the thermochromic material in the lining surface image acquired by the image acquisition device to be not less than 1 pixel, so as to achieve the required crack recognition accuracy. The calculation formula of the crack recognition ability coefficient is: Wherein N represents the crack recognition ability coefficient, W1 represents the color change width of the thermochromic material in the masonry surface image acquired by the image acquisition device, and W represents the crack width.
[0031] In addition, early warning can be issued based on information on cracks on the lining surface to alert relevant personnel.
[0032] Through the above technical solution, lining cracks can be monitored. On this basis, in order to monitor lining chipping, surface treatment can be added to the chipping-prone area of the lining surface in S1, so that the color of the chipping-prone area is inconsistent with the color of the lining surface. In S3, the collected lining surface image includes the chipping-prone area. In S4, the lining chipping is obtained by identifying the color change of the chipping-prone area. In this way, the presence of lining chipping and the chipping area can be judged by the color change of the chipping-prone area.
[0033] Specifically, the area prone to block falling includes areas with dense cracks, areas with misaligned cracks, and areas where cracks are closed into a ring. The information of the color change area in the area prone to block falling includes the position, quantity, or area, and the information of the lining block falling includes the position, quantity, or area. An early warning can also be issued based on the information of lining block falling to alert relevant personnel.
Claims
1. A lining monitoring method based on thermochromic materials, characterized in that: The following steps are involved: S1. Use a thermal imager to image and identify the lining surface to obtain low-value areas of thermal radiation; S2, treating the lining surface of the low-value thermal radiation area with a thermochromic material to obtain an area treated with the thermochromic material; S3, using an image acquisition device to acquire an image of the lining surface, wherein the image of the lining surface includes an area treated with a thermochromic material; S4. Obtaining information on cracks on the lining surface by identifying information on the discolored area of the area treated with the thermochromic material.
2. The lining monitoring method based on thermochromic material according to claim 1 is characterized in that: The step of treating the lining surface of the low-value thermal radiation area with the thermochromic material includes surface pasting or spraying.
3. The lining monitoring method based on thermochromic material according to claim 1 is characterized in that: The thermochromic material is selected according to the crack recognition ability coefficient of the image acquisition device, so that the low value of thermal radiation caused by the crack change causes the color change width of the thermochromic material in the lining surface image acquired by the image acquisition device to be not less than 1 pixel. The calculation formula of the crack recognition ability coefficient is: Where N represents the crack recognition ability coefficient, W1 represents the color change width of the thermochromic material in the lining surface image captured by the image acquisition device, and W represents the crack width.
4. The lining monitoring method based on thermochromic material according to claim 1 is characterized in that: The information of the discolored area of the area treated with the thermochromic material includes length, width, number or shape, and the information of the cracks on the lining surface includes length, width, number or shape of the cracks.
5. The lining monitoring method based on thermochromic material according to any one of claims 1 to 4, characterized in that: The lining monitoring method based on thermochromic materials also includes: issuing early warnings based on information on cracks on the lining surface.
6. The lining monitoring method based on thermochromic material according to claim 1 is characterized in that: S1 also includes surface treatment of the area on the lining surface that is prone to chipping, so that the color of the area that is prone to chipping is inconsistent with the color of the lining surface. The lining surface image in S3 also includes the area that is prone to chipping. S4 also includes obtaining information on lining chipping by identifying information on the color change area of the area that is prone to chipping.
7. The lining monitoring method based on thermochromic material according to claim 6 is characterized in that: The area prone to block falling includes areas with dense cracks, areas with dislocated cracks and areas where cracks are closed into a ring.
8. The lining monitoring method based on thermochromic material according to claim 6 is characterized in that: The information of the color change area in the area prone to block falling includes the position, quantity or area, and the information of the lining block falling includes the position, quantity or area.
9. The lining monitoring method based on thermochromic material according to any one of claims 6 to 8, characterized in that: The lining monitoring method based on thermochromic materials also includes: issuing an early warning based on information on lining block falling.