Building structure and surface abnormal change detection method based on micro-motion attribute laser detection

Abstract

The invention belongs to the technical field of detection, and particularly relates to a building structure and surface abnormal change detection method based on micro-motion attribute laser detection. The method comprises the following multiple steps of deploying an all-fiber coherent laser scanning detection system at a proper position of a detected object; selecting working parameters of the detection system according to actual task requirements and surrounding environment characteristics; setting parameters such as a detection range, a scanning path, a scanning step and scanning dwell timeof each point in a scanning system according to a building to be detected; scanning and detecting a target, receiving an echo signal, analyzing and processing the echo signal, and calculating the vibration amplitude and the vibration frequency of each scanning point; according to the calculated vibration parameters of each scanning point, generating vibration amplitude and vibration frequency images corresponding to the target, and judging whether the surface of a structure is abnormal or not. The building structure and surface abnormal change detection method based on micro-motion attributelaser detection belongs to nondestructive non-contact detection, and vibration distribution images with different resolutions can be obtained according to needs.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a method for detecting abnormal changes in building structures and surfaces based on micro-motion attribute laser detection. Background technique [0002] With the increase of the use time, the appearance of the building falls off, and the safety accidents caused by the change of the internal structure always threaten the safety of people's lives and property. Therefore, there is a wide range of application bases for safety testing and life prediction of the structural and surface anomalies of buildings (houses, bridges, tunnels, etc.). Detection is widely used in this field. The main non-destructive testing methods used for engineering quality testing of building structure and surface anomalies are: [0003] 1. Infrared thermal imaging camera method, which uses the temperature difference between the normal area and the cracked and hollowed area in the sun to dete...

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Problems solved by technology

However, it requires sunny days and sunlight, so it is useless for materials that do not change significantly in temperature, such as just hung or glass curtain walls

[0004] 2. Ultrasonic testing method, non-destructive testing, can measure the internal structure of objects, convenient and safe, but because of the penetration test, two opposite test surfaces are required, and multiple test points are required. It is not suitable for single-sided structures, such as roads and bottom plates.

However, contact detection is also required, and the process is complicated

[0008] It can be seen that the resolution of the existing methods is low, most of them require contact measurement, and have high requirements on time and environment

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