Ultrasonic generator based on linear frequency modulation technology and method for detecting metal welding seam defects by adopting same

A technology of linear frequency modulation and linear frequency modulation signals, which is applied in the analysis of solids by sound waves/ultrasonic waves/infrasonic waves, and fluids using vibrations, etc. It can solve the problems of poor detection ability of small defects and short propagation distance of ultrasonic signals, so as to improve identification, The effect of improved recognition accuracy

Active Publication Date: 2013-09-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the ultrasonic signal generated by the existing ultrasonic detection signal generating device has a short propagation distance and poor detection ability for small defects in the

Method used

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  • Ultrasonic generator based on linear frequency modulation technology and method for detecting metal welding seam defects by adopting same
  • Ultrasonic generator based on linear frequency modulation technology and method for detecting metal welding seam defects by adopting same
  • Ultrasonic generator based on linear frequency modulation technology and method for detecting metal welding seam defects by adopting same

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specific Embodiment approach 1

[0023] Specific implementation mode one: combine figure 1 Describe this embodiment, a kind of ultrasonic generator based on chirp technology in this embodiment, the ultrasonic generator is composed of a host computer 1, a first control unit 2, a chirp signal generating circuit 3, a second control unit 4, a power amplifier Circuit 5 and ultrasonic conversion circuit 6 are formed;

[0024] The control signal output end of the first control unit of the host computer 1 is connected to the control signal input end of the first control unit 2, and the control signal output end of the first control unit 2 is connected to the No. 1 control signal input end of the chirp signal generating circuit 3, and the upper The frequency modulation signal control signal output end of machine 1 is connected to the No. 2 control signal input end of linear frequency modulation signal generating circuit 3, the second control signal output end of host computer 1 is connected to the control signal input...

specific Embodiment approach 2

[0029] Embodiment 2: This embodiment is a further description of the ultrasonic generator based on the chirp technology described in Embodiment 1. The chirp signal generating circuit 3 is realized by a chip modeled as AD9910.

specific Embodiment approach 3

[0030] Specific embodiment three: the embodiment is a further description of the ultrasonic generator based on the chirp technology described in the specific embodiment one. The ultrasonic conversion circuit 6 adopts an ultrasonic straight probe, an ultrasonic oblique probe, an ultrasonic focusing probe, an ultrasonic band probe or SAW probe.

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Abstract

The invention discloses an ultrasonic generator based on a linear frequency modulation technology and a method for detecting metal welding seam defects by adopting the same and relates to the technical field of quality detection of a welding structure. By means of the ultrasonic generator based on the linear frequency modulation technology and the method for detecting the metal welding seam defects by adopting the ultrasonic generator, the problems that ultrasonic signals generated by an existing ultrasonic inspection and measurement signal generation device are short in transmission distance, and the ultrasonic inspection and measurement signal generation device has poor small defect detection capability on welding seams of large-thickness super metal worlpieces can be solved. A linear frequency modulation signal generation circuit generates linear frequency modulation signals through a first control unit, a second control unit and an upper computer and transmits the generated pulse signals to the welding seams of the metal workpieces to detect the metal workpieces to be detected, an ultrasonic signal acquisition device is used for collecting ultrasonic signals reflected by the welding seams of the metal workpieces, and the upper computer is used for performing matching filtering on the received ultrasonic signals so as to obtain metal welding seam defect positions. The ultrasonic generator is suitable for the technical field of quality detection of the welding structure.

Description

technical field [0001] The invention relates to the technical field of quality detection of welded structures. Background technique [0002] With the rapid development of industrial production, large-thickness welded structures are widely used in boilers, pressure vessels, shipbuilding and other fields. Since these structures are often in extreme environments such as high temperature, high pressure or high load, the requirements for their welding quality are high. have an accident. As one of the quality control methods, ultrasonic testing technology plays an important role in the testing of large-thickness welded structures. [0003] However, for ultrasonic testing of large-thickness welded structures, due to the short propagation distance of ultrasonic signals and the influence of weld structure, the ability to detect small defects is poor, which is not conducive to the quality evaluation of welded structures. Contents of the invention [0004] In order to solve the pro...

Claims

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Application Information

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IPC IPC(8): B06B1/02G01N29/04
Inventor 刚铁张佳莹盛朝阳丛森王常玺
Owner HARBIN INST OF TECH
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