Concrete surface crack width measuring instrument and method based on smart phone

Abstract

The invention discloses a concrete surface crack width measuring instrument and method based on a smart phone. The measuring instrument comprises the smart phone and a wooden cushion block. During working, the wooden cushion block is placed beside a crack to be detected of the concrete surface, the back portion of the smart phone is tightly close to the upper surface of the wooden cushion block, and a camera of the smart phone is aligned to the crack to be detected of the concrete surface. A crack image processing program is installed on the smart phone, and crack image information acquired by the camera on the back portion of the smart phone is processed through the crack image processing program. In the method, a crack image is acquired by starting the crack image processing program and the camera of the smart phone, displayed on a screen of the smart phone and subjected to image analysis processing, and the crack width is calculated. The measuring instrument is simple in detection process, low in cost, small in size, convenient to carry and capable of achieving high-accuracy low-cost concrete surface crack width measurement.

Description

technical field [0001] The invention relates to a concrete surface crack width measuring instrument, in particular to a concrete surface crack width measuring instrument and a method based on a smart phone, belonging to the field of civil engineering detection. Background technique [0002] There are many reasons for the cracks on the concrete surface: 1) under the action of the external force of the structure, the bearing capacity is insufficient, resulting in structural cracks; 2) the excessive temperature difference between the inside and outside of the concrete causes internal shrinkage to generate self-stress, when the self-stress exceeds the allowable concrete When stressed, non-structural cracks will occur. Therefore, accurate measurement of the width of cracks is crucial to judging the safety status of structures. [0003] The traditional crack microscope uses a microscope with a certain magnification to directly observe the crack width. It is necessary to manually...

AI Technical Summary

Problems solved by technology

It is necessary to manually adjust the focal length and read and record at close range, and some need to be equipped with a light source. The test speed is slow, the labor intensity of the test work is high, and there are large human reading errors.

In addition, some researchers use high-definition cameras to col

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