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A discussion is given of the principles of thickness measurement by the ultrasonic resonance method and equipment designed for applying this technique to the measurement of the depth of corrosion in chemical equipment is described. Emphasis is placed on the proper use of transducers and coupling media for optimum results. In actual practice, certain key points should be selected for testing signal identification is best achieved with an oscilloscope, and if the resonant signal appears very often during measurements of thickness, the accuracy can be improved by taking the mean of several measurements. Some of the parameters of the Chinese model HS-1 meter, which has a maximum error of 4-4%, and an average error of 1-3% when measuring steel having a thickness of 3-30 mm, are given. At the present time, this technique cannot be used for measuring the wall thickness of small-diameter pipes.
Non-destructive testing, Ultrasonic testing, Thickness measurement, Dimensional measurement, Dimensions, Ultrasonics, Velocity measurement, Metals, Non-metals
Focusing on the theory and state-of-the-art technologies of ultrasonic testing (UT), this book examines ultrasonic propagation in solids and its detection applications, and explores the intersection of UT technology with various fields of electromagnetics, optics and physics. UT is one of the most widely used nondestructive testing techniques due to its high performance in terms of detection efficiency and safety. The rapid development of modern industrial products and technologies has created a new challenge and demand for ultrasonic nondestructive testing technology. This book introduces the fundamentals of UT, including sound wave and sound field, interface wave theory and liquid-solid coupled sound field. It then discusses various types of UT methods, ranging from the critically refracted longitudinal wave method to ultrasonic surface wave and ultrasonic guided wave detection methods. Some newly developed UT techniques are also discussed, including phased-array UT, high-frequency UT and non-contact UT. This title will appeal to engineering students and technicians in the field of ultrasonic nondestructive testing.