Abstract:
PROBLEM TO BE SOLVED: To provide a thickness measuring method by use of ultrasonic waves for extracting only reflection echoes based on thickness of an object automatically and measuring thickness of the object with high precision. SOLUTION: This thickness measuring method includes: a measuring process for detecting waveforms of reflection echoes by generating ultrasonics from an ultrasonic probe at each measuring position of the object; a peak detection process for setting a scope of detection in the direction of thickness Z of the object and detecting a peak from each detected waveform; a peak apportioning process for preparing a three-dimensional virtual space having a shape obtained from the object, dividing the space in the direction of length X, the direction of width Y, and the direction of thickness Z of the object to form many zones, apportioning the peak positions to each of these zones, and calculating the number of peak positions in each zone; a grouping process for forming a plurality of groups by connecting the continuous zones where the number of peaks is calculated; and a thickness computing process for separating a zone constituting the group being non-continuous from the zones constituting the groups being continuous in the direction of length X, the direction of width Y, and the direction of thickness Z of the object and computing thickness of the object. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a flaw detection method capable of simply detecting the flaw produced in an inspection target part difficult to inspect, such as, a welded part at a high speed in a non-contact state, regardless of the thickness and the material of an inspection target, the shape of the welded part, or the like, and to provide a flaw detector used therein. SOLUTION: Ultrasonic waves are transmitted to the inspection target from a probe, while the ultrasonic waves that propagate through the inspection target are received, to detect the flaw of the inspection target part by the receiving signal. The probe is scanned along the inspection target part in a non-contact state, and the respective receiving signals of a plurality of kinds of the ultrasonic waves propagated through the inspection target are displayed as the image of at least either of a B-scope or a C-scope. The flaw is detected on the basis of the existence of the change part R2 in the image. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a flaw detection method capable of simply and quickly detecting the flaws produced in an inspection target part that is difficult to inspect a welded part, or the like, irrespective of the thickness and kind of inspection target, the shape of the welded part, and so on, and to provide a flaw detector used for the method. SOLUTION: An ultrasonic wave is transmitted to the inspection target from a probe while the ultrasonic wave propagated through the inspection target is received to detect the flaw of the inspection target part by the receiving signal. The probe is scanned along the inspection target part and the respective receiving signals of a plurality of kinds of the ultrasonic waves that propagate through the inspection target are displayed as a B scope image, having the scanning direction of the probe and the thickness direction of the inspection target as axes. The flaw is detected on the basis of the existence of a change part R2 in the B scope image. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a flaw evaluation method of bellows capable of rapidly and simply evaluating the flaw such as corrosion or damage of the bellows even in the bellows having a two layered structure, and an eddy current flaw detector used therein. SOLUTION: The flaw of the two-layered bellows 100 obtained by molding two metal thin plates is evaluated. A sensor 20 is scanned along the protruded surface 104a on the first layer side being the outside of the thin plate to perform eddy current flaw detection while a transmission and reception element is scanned along the protruded surface 104a on the side of the first layer to perform ultrasonic flaw detection. The flaw is evaluated on the basis of the receiving signals of eddy current flaw detection and ultrasonic flaw detection. COPYRIGHT: (C)2008,JPO&INPIT