Non-contact ultrasonic detection method

Abstract

The invention relates to a non-contact ultrasonic detection method, and belongs to the field of nondestructive detection. The method comprises the following steps: data acquisition, data preprocessing, characteristic wave extraction, data analysis and comparison, and result feedback and evaluation. According to the method, filtering processing can be carried out on an ultrasonic waveform, the ultrasonic waveform is compared with a pre-input to-be-detected density range, data which do not belong to the density range of a to-be-detected piece is taken as clutter processing, only waveforms, namely characteristic waves, within the range from generation of specific density waves to ending of the density waves are reserved, and the characteristic waves are extracted; the waveform is compared with a normal waveform in a preset database so as to obtain an abnormal waveform in the wave band, then the abnormal waveform is compared with a defect waveform in the database, a defect type to which the waveform belongs is determined , and a defect level is determined according to the waveform; and the obtained defect type and defect level data are output as a detection result to form a report. Theproblem that an underground target cannot be effectively detected in the prior art for example, a pipeline deeply buried underground is successfully solved.

Description

technical field [0001] The invention relates to a non-contact ultrasonic detection method, which belongs to the field of non-destructive detection. Background technique [0002] As an important energy source, natural gas and other gases are widely used in industrial production and daily life, which brings us great convenience. Natural gas is mainly transported through pipelines. With the development of economy and society, the demand for natural gas has increased sharply, and the length of natural gas pipelines has also increased sharply. [0003] Taking the West-to-East Gas Transmission Project as an example, as the operating time of the pipeline increases, the service pipeline gradually ages due to the corrosion of the gas, the environment and the pressure load, and cracks and corrosion are easy to occur on the surface of the pipeline. When the corrosion depth deepens, the strength of the pipeline wall decreases, and the pipeline is prone to bursting or cracking and leaka...

AI Technical Summary

Problems solved by technology

However, most of the pipelines are buried deep underground, and the existing technology needs to be contacted to detect, and the underground targets cannot be effectively detected

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