A calibration method and apparatus for a through-type bar full-focus automatic flaw detection system.

By recording and compensating for the sensitivity data from the full-focus ultrasound image feedback, the problem of calibration of full-focus ultrasound testing equipment was solved, achieving accuracy and consistency of test results and avoiding missed detections or misjudgments.

CN122306957APending Publication Date: 2026-06-30NANJING IRON&STEEL CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING IRON&STEEL CO LTD
Filing Date
2026-04-30
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing calibration techniques are not applicable to full-focus ultrasonic testing, which means that automatic flaw detection equipment for through-feed bars cannot be effectively calibrated before testing, affecting the reliability and consistency of test results.

Method used

A calibration method was designed to control the movement of a sample rod, record the sensitivity data fed back from the full-focus ultrasound image, and use the full-focus calibration algorithm to generate compensation parameters to ensure that the sensitivity difference of defects of the same type and size within the detection area is less than 1 dB. Calibration is performed by region, sound beam, and defect type.

Benefits of technology

It achieves effective calibration of the fully focused automatic flaw detection system, ensuring the accuracy and consistency of the test results and avoiding missed or misjudged defects.

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Abstract

This invention discloses a calibration method and apparatus for a through-type bar full-focus automatic flaw detection system, relating to the field of nondestructive testing technology for metallic materials. The method includes the following steps: Step S1: Controlling the movement of a sample bar with preset artificial defects, causing different defects on the sample bar to sequentially enter multiple preset positions within the detection area of ​​the full-focus ultrasonic probe, and recording the sensitivity data of the full-focus ultrasonic image feedback corresponding to each position; Step S2: Processing the sensitivity data using a computer algorithm to generate compensation parameters, which are used to compensate the sensitivity data feedback of defects of the same type and size appearing at any position within the detection area until the difference is less than or equal to a preset threshold. This invention, taking advantage of the imaging characteristics of full-focus ultrasound, achieves effective calibration of the through-type bar full-focus automatic flaw detection system by recording the brightness (sensitivity) of defects in the image and performing compensation processing.
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