Concrete structure detection method

Abstract

The invention discloses a concrete structure detection method, which is characterized in that an ultrasonic excitation source is additionally arranged to interact with a concrete structure to excite tiny changes inside and on the surface of the structure, so that the heat conduction performance is influenced, and recognizable traces are left in an infrared image. By combining ultrasonic damage positioning and infrared deep analysis, a thermal signal of a damaged area is enhanced, and the detection sensitivity and resolution are improved. Through heat map sequence edge identification and gray value calculation, an image processing area is determined, and the detection efficiency is optimized. And establishing a quantitative relationship between the damage depth and the thermal signal to realize accurate assessment of the damage depth. According to the method, the detection comprehensiveness, accuracy and efficiency are improved, the adaptability is high, the cost benefit is high, and powerful technical support is provided for health monitoring of the concrete structure.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete structure detection, and in particular to a concrete structure detection method combining ultrasonic excitation and infrared imaging. Background Art

[0002] In the detection technology of concrete structures, traditional detection methods such as percussion, ultrasonic, and radar can detect internal damage of concrete structures to a certain extent, but these methods have certain limitations. The percussion method relies on the experience of the inspector, is highly subjective, and the detection results are easily affected by personal judgment; although the ultrasonic method can detect cracks and cavities inside the structure, it is difficult to capture subtle damage on the concrete surface; although the radar method can detect deep defects, its penetration depth and resolution are limited, and the cost is relatively high.

[0003] In addition, the damage of concrete structures is often caused by a variety of factors, including but not limited to material aging, environmental erosion, external forces, etc. These damages may not be obvious in the early stage, but will gradually accumulate and accelerate the deterioration of the structure over time. Therefore, a detection method that can comprehensively and accurately evaluate the damage state of concrete structures is needed.

[0004] In recent years, infrared imaging technology has been increasingly used in the field of structural health monitoring. It can indirectly reflect the internal damage status by capturing the temperature distribution difference on the surface of the structure. However, it is sometimes difficult to clearly identify the damage location and degree of concrete structures by relying solely on infrared imaging technology, especially when the ambient temperature does not change much or the damaged area is small.

[0005] Therefore, how to combine multiple detection technologies to improve the accuracy and reliability of concrete structure damage detection has become a hot topic in current research. It is necessary to develop a detection method that can comprehensively consider the damage characteristics of concrete structures and utilize the advantages of multi-technology integration to achieve early detection and accurate assessment of damage. Summary of the invention

[0006] The purpose of the present invention is to provide a concrete structure detection method, aiming to solve the problems of incomplete detection, low accuracy and low efficiency existing in the single detection method in the prior art, as well as the problem of poor detection effect under complex environmental conditions, so as to achieve early detection and accurate assessment of concrete structure damage.

[0007] In order to achieve the above purpose, the following scheme is provided: a concrete structure detection method, characterized in that it includes: S1. Add an ultrasonic excitation source based on the infrared imaging system; S2. Use ultrasonic excitation source to pre-treat the concrete structure and stimulate small changes inside and on the surface of the structure; S3. Use infrared imaging technology to capture the temperature changes caused by ultrasonic excitation and achieve high-precision positioning of the damaged area; S4. Perform edge recognition through the heat map sequence to determine the image processing area to avoid invalid detection of the entire heat map area; S5. Calculate the gray value in the determined image processing area, and select the maximum value and the imaging time when it appears as the key judgment value; S6. Use a standard with known damage depth and area to test the sample and establish a quantitative relationship between damage depth and thermal signal; S7. Apply the quantitative relationship to the object to be inspected to achieve accurate assessment of the damage depth; S8. Repeat the above steps to perform damage detection on the concrete structure to be inspected.

[0008] Furthermore, the ultrasonic wave generated by the ultrasonic excitation source has a specific frequency and is used to excite minute changes inside and on the surface of the concrete structure.

[0009] Furthermore, ultrasonic excitation is used to enhance the thermal signal of the damaged area, thereby improving the sensitivity and resolution of infrared imaging.

[0010] Furthermore, the detection efficiency is significantly improved by optimizing the image processing area and method.

[0011] A device combining ultrasonic damage location and infrared depth analysis for concrete structure detection, comprising: a) Ultrasonic excitation source, used to generate ultrasonic waves of a specific frequency; b) infrared imaging system to capture the temperature changes of the concrete structure after ultrasonic excitation; c) Image processing system for edge recognition and gray value calculation, determination of damaged area and depth assessment.

[0012] Furthermore, a quantitative relational database is included for storing the thermal image sequence and damage depth information of the standard.

[0013] Furthermore, the ultrasonic excitation source and the infrared imaging system can be operated synchronously to improve detection efficiency.

[0014] The advantages of the present invention are: 1. Improved comprehensiveness of detection: By combining ultrasonic excitation and infrared imaging, it is possible to detect subtle damage that is difficult to capture with traditional detection methods, thus achieving comprehensive detection of concrete structure damage.

[0015] 2. Improved detection accuracy: Ultrasonic excitation is used to enhance the thermal signal of the damaged area, improve the sensitivity and resolution of infrared imaging, and make the judgment of the damage location and degree more accurate.

[0016] 3. Enhanced detection efficiency: Through optimized image processing areas and methods, invalid detection of the entire heat map area is avoided, significantly improving detection efficiency.

[0017] 4. Strong adaptability: The present invention can adapt to a variety of injury types and complex environmental conditions, and has significant advantages in the discovery and assessment of early injuries.

[0018] 5. Cost-effectiveness: Compared with high-cost detection methods, the present invention achieves effective cost control through technical integration, while ensuring the detection effect, and has higher economic and social benefits.

[0019] In summary, the present invention provides an efficient, accurate and comprehensive method for detecting damage to concrete structures, which provides strong technical support for health monitoring and maintenance of concrete structures. DETAILED DESCRIPTION

[0020] The following is a further detailed description through specific implementation methods: The concrete structure detection method is implemented by an ultrasonic excitation and infrared imaging coupling detection system: the detection system of the present invention is mainly composed of an ultrasonic excitation source, an infrared imager and a data processing unit. The ultrasonic excitation source generates ultrasonic waves of a specific frequency, which interact with the concrete structure to stimulate small changes inside and on the surface of the structure. The infrared imager captures temperature changes and forms a thermal map. The data processing unit is responsible for analyzing the thermal map and evaluating the damage.

[0021] The present invention combines ultrasonic damage location with infrared depth analysis: First, the ultrasonic excitation source pre-treats the concrete structure to produce temperature changes. Then, the infrared imager captures the temperature changes in real time to form a thermal map. Through the image processing algorithm, the abnormal area in the thermal map is analyzed to locate the damaged area. By comparing the thermal map sequence of the standard, a quantitative relationship between the damage depth and the thermal signal is established to achieve damage depth assessment.

[0022] Next, the image processing area is optimized: the edge recognition of the thermal image sequence is performed to determine the largest closed area as the image processing area. The gray value is calculated in this area, and the maximum value and its imaging time are selected as the key judgment value. By optimizing the image processing area, invalid detection of the entire thermal image is avoided and the detection efficiency is improved.

[0023] Then, reverse inference of depth information is performed: first, samples with known damage depth and area are used for sample testing, and their thermal map sequences are analyzed to establish a quantitative relationship between damage depth and thermal signal. Then, this relationship is applied to the object to be tested with unknown damage depth, and the damage depth is inferred through key judgment values.

[0024] Finally, repeat the steps: for the concrete structure to be inspected, repeat the above steps, i.e., perform ultrasonic excitation, implement infrared imaging, optimize image processing, and perform damage location and depth assessment.

[0025] The specific implementation process is as follows: Example 1

[0026] Assume that there are multiple damaged areas on the surface of the concrete structure to be inspected. First, the structure is pretreated using an ultrasonic excitation source. Then, the temperature change after pretreatment is captured by an infrared imager to form a thermal map. The edge area in the thermal map is analyzed by an image processing algorithm to determine the image processing area. Within this area, the grayscale value is calculated, and the maximum value and its imaging time are selected as the key judgment value.

[0027] The quantitative relationship between the damage depth and the thermal signal is established with reference to the thermal image sequence of the standard. The damage depth range of the structure to be inspected is inferred through the key judgment value. For example, if the key judgment value is 7, the damage depth range can be inferred to be 20mm to 30mm based on the quantitative relationship. Example 2

[0028] In another concrete structure inspection scenario, an ultrasonic excitation source is also used to pre-process the structure. The temperature change is captured by an infrared imager, and the image processing algorithm is used to determine the image processing area. Within this area, the gray value change is analyzed and the key judgment value is selected.

[0029] Based on the thermal image sequence of the standard, a quantitative relationship between the damage depth and the thermal signal is established. The damage depth is quantitatively analyzed through the key judgment value. For example, if the key judgment value is 11, based on the quantitative relationship, it can be inferred that the damage depth ranges from 15mm to 20mm.

[0030] Through the above embodiments, the detection method of the present invention can effectively detect and accurately evaluate the damage of concrete structures at an early stage, and has broad application prospects and practical application value.

[0031] Thermal image generation and processing system structure: Thermal imagers and computers work together to complete the generation and processing of thermal images. The depth values ​​of each defect of the standard part are entered into the computer to establish a quantitative relationship between the damage depth and the thermal signal. Each thermal image corresponds to a closed area and an image processing area, which correspond to the coordinates of the thermal image, ensuring the accuracy and pertinence of the detection.

[0032] The present invention discloses a method for detecting concrete structures. An ultrasonic excitation source is added to interact with the concrete structure to stimulate minute changes inside and on the surface of the structure, thereby affecting the thermal conductivity and leaving recognizable traces in infrared images. Ultrasonic damage positioning is combined with infrared depth analysis to enhance the thermal signal of the damaged area, thereby improving the sensitivity and resolution of detection. The image processing area is determined by edge recognition and grayscale value calculation of the thermal image sequence to optimize the detection efficiency. A quantitative relationship between the damage depth and the thermal signal is established to achieve accurate assessment of the damage depth. The present invention improves the comprehensiveness, accuracy and efficiency of detection, has strong adaptability, and is cost-effective, providing strong technical support for health monitoring of concrete structures.

[0033] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the scope of protection of the present invention, which will not affect the effect of the implementation of the present invention and the applicability of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for detecting a concrete structure, characterized in that: include: S1. Add an ultrasonic excitation source based on the infrared imaging system; S2. Use ultrasonic excitation source to pre-treat the concrete structure and stimulate small changes inside and on the surface of the structure; S3. Use infrared imaging technology to capture the temperature changes caused by ultrasonic excitation and achieve high-precision positioning of the damaged area; S4. Perform edge recognition through the heat map sequence to determine the image processing area to avoid invalid detection of the entire heat map area; S5. Calculate the gray value in the determined image processing area, and select the maximum value and the imaging time when it appears as the key judgment value; S6. Use a standard with known damage depth and area to test the sample and establish a quantitative relationship between damage depth and thermal signal; S7. Apply the quantitative relationship to the object to be inspected to achieve accurate assessment of the damage depth; S8. Repeat the above steps to perform damage detection on the concrete structure to be inspected.

2. The concrete structure detection method according to claim 1, characterized in that: The ultrasonic wave generated by the ultrasonic excitation source has a specific frequency and is used to excite small changes inside and on the surface of the concrete structure.

3. The concrete structure detection method according to claim 1, characterized in that: Ultrasonic excitation is used to enhance the thermal signal of the damaged area and improve the sensitivity and resolution of infrared imaging.

4. The concrete structure detection method according to claim 1, characterized in that: The detection efficiency is significantly improved by optimizing the image processing area and method.