CONTACTLESS INSPECTION SYSTEM OF PIPE USING RING-ARRAYED LASER ILLUMINATION

摘要

The present invention is a laser-relates to a pipe inspection apparatus using ultrasonic waves, to the quality evaluation of the pipe by using a laser beam of the ring array form and uniformly only the guided wave in the specific mode occurs in a non-contact in a pipe, by using this, cracks or It relates to non-contact type pipe inspection device according to the ring array laser irradiation to analyze the pipe coupling and thickness wall thickness due to corrosion. With such a pipe inspection apparatus of the present invention, it becomes possible to generate a guided wave having a circumferential direction over a uniform wave front distribution and the intensity distribution across the pipe wall or the outer wall, wherein the generated guided wave is determined by the ring array interval It is only to have a specific wavelength. In addition, but using the air-coupled transducer, by controlling the receiving angle may receive only the ultrasound of a certain mode, you can omit the step that must identify the mode of the received signal components needed in conventional guided wave techniques, respectively It allows. In the end, and the effect of the ultrasonic energy is concentrated is improved the S / N ratio of the signal in one mode, a single wavelength component it is possible to precisely analyze the wavelength changing by the change of the defect or the thickness. ; Laser, ultrasonic, wavelength matching, pipe, guided wave, non-contact ring arrangement