Ultrasonic probe, and method for measuring thickness of pipe being inspected using same

Abstract

When a beam is emitted from inside a pipe onto an inside surface of the pipe by using an ultrasonic probe in which flat plate-like transducers are arranged, since the transducers are in the shape of flat plates, signals reflected from the tubular pipe wall do not only return straight to the oscillator , but also scatter and interfere in the returning waves. An ultrasonic oscillator according to the invention of the present application is curved to match the internal shape of the pipe, and therefore ultrasonic waves from the oscillator radiate perpendicular to the pipe wall, and reflected echo signals thereof are also reflected and return perpendicularly from the irradiated pipe wall, and therefore scattering and interference occur less than with ultrasonic waves and reflected waves emitted from flat plate-like oscillators arranged in positions at oblique angles with respect to the pipe wall, and it is thus possible to obtain clear data by selecting ultrasonic waves having a wavelength corresponding to the thickness of the pipe.

Description

technical field [0001] The invention relates to an ultrasonic probe and a method for inspecting the thickness of a pipe to be inspected by using the ultrasonic probe. Background technique [0002] Conventionally, ultrasonic flaw detection has been known as one of nondestructive inspections. Ultrasonic flaw detection refers to the inspection of flaws in the test body, the thickness of piping, etc., by injecting ultrasonic waves into the test body and inspecting the reflected or transmitted waves of the ultrasonic waves. [0003] Various boilers are generally used in severe environments where high-temperature and high-pressure fluids circulate, and may be damaged, so regular inspections are required for breakage, cracks, cracks, and reduction in tube thickness of tubes used in boilers. In the method of cutting a boiler tube and inserting an inspection tool from the cut point to inspect the tube body for breakage, cracks, cracks, reduction in tube thickness, etc., it takes a l...

AI Technical Summary

Problems solved by technology

[0012] The utility model of Patent Document 3 relates to an ultrasonic probe used for ultrasonic probe flaw detection inspection of pipes. In the conventional ultrasonic probe, the ultrasonic beam transmitted from the vibrator of the ultrasonic probe inserted into the inner side of the pipe is refracted when it enters the inside of the pipe, but The transmitting surface of the vibrator is flat. On the other hand, since the incident surface of the tube on which the ultrasonic beam is incident, which is the inspection object, is curved, the incident angle varies depending on the position of the vibrator. Therefore, there is a spread of the beam entering the inside of the tube, and it is impossible to obtain clear The problem of reflected beams

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