Weathering resistant steel rust layer thickness detection method and system

• Main Authors: FANG JINJIAN, HUANG SHAOXIONG, ZHANG WENXUE, ZHANG HAO, DAI MINGMING, WANG KANG, YAO TINGJING, HUANG DONG, LI QIANG, CHEN QING, JIANG LEI, FENG ZHIHUA
• Format: Patent
• Language: Chinese; English
• Published: 25.10.2022
• Subjects: MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

The invention discloses a weathering resistant steel rust layer thickness detection method and system, and belongs to the technical field of corrosion detection.The method comprises the steps that an electromagnetic ultrasonic detection device is used for exciting ultrasonic waves on the surface of weathering resistant steel to generate a first echo signal; processing the first echo signal by using an average filtering algorithm to obtain a second echo signal; processing the second echo signal by using an envelope extraction algorithm, and extracting an envelope line of the second echo signal; performing low-pass filtering and Fourier spectrum analysis on the envelope line by adopting a time difference calculation method to obtain an envelope spectrum; and processing the envelope spectrum by adopting a data fitting method, and calculating the thickness of the rust layer on the surface of the weathering resistant steel. Defect or thickness information is obtained by detecting the change of the electric signal,