Title:
ULTRASONIC FLAW DETECTION METHOD AND ULTRASONIC FLAW DETECTION DEVICE
Document Type and Number:
Japanese Patent JP2019191062
Kind Code:
A
Abstract:
To provide an ultrasonic flaw detection method for an object to be inspected, such as a steel material having a large attenuation due to the propagation of ultrasonic waves, in which the calibration test piece is not required, the reduction of the SN ratio by the DAC correction is suppressed, and the signal-to-noise ratio is improved so as to improve the SN ratio depending on the position of the defect signal.SOLUTION: The ultrasonic flaw detection method includes a first step for receiving an echo of an ultrasonic wave emitted from an ultrasonic probe 2 disposed on the surface of the object to be inspected 1 in the inspection region I of the object 1 to be received by the distance x within the inspection region I of the subject 1; a second step for calculating the attenuation amount of the function f (x) representing the attenuation amount of the noise signal group from the maximum noise signal y in the noise signal group in the test region I in the graph of the signal intensity for the distance x obtained in the first step; and a third step for individually multiplying the noise signal group in the inspection area I by the correction coefficient calculated by the distance x by the function f (x) and increasing the signal intensity of the noise signal group individually.SELECTED DRAWING: Figure 3
Inventors:
KODAMA KEIJI
ITO MITSUHIRO
ITO MITSUHIRO
Application Number:
JP2018085889A
Publication Date:
October 31, 2019
Filing Date:
April 27, 2018
Export Citation:
Assignee:
DAIDO STEEL CO LTD
International Classes:
G01N29/11; G01N29/38; G01N29/48
Attorney, Agent or Firm:
Suzuki Manabu