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Automatic detection method for oblique incidence wave technology steel plate and device thereof

An automatic detection device, oblique incidence technology, applied in measuring devices, using ultrasonic/sonic/infrasonic waves, using sound waves/ultrasonic/infrasonic waves to analyze solids, etc., can solve problems such as inability to effectively detect cracks, and achieve high detection accuracy and real-time performance , strong environmental adaptability and high confidence

Inactive Publication Date: 2009-04-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the vertical incident body wave is sensitive to inclusions and volume defects, it cannot effectively detect defects such as cracks

Method used

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  • Automatic detection method for oblique incidence wave technology steel plate and device thereof
  • Automatic detection method for oblique incidence wave technology steel plate and device thereof
  • Automatic detection method for oblique incidence wave technology steel plate and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1, combining figure 1 , the present invention oblique incidence body wave technology steel plate automatic detection device, it is made up of electromagnetic ultrasonic detection unit (1) and circuit system (2); Electromagnetic ultrasonic detection unit (1) connects circuit system (2). Described circuit system (2) comprises transmitting circuit (3), receiving circuit (4), AD conversion circuit (5), microcontroller (6), memory circuit (7) and display circuit (8); Transmitting circuit ( 3) Connect the microcontroller (6), the receiving circuit (4) is connected to the AD conversion circuit (5), the AD conversion circuit (5) is connected to the microcontroller (6), and the microcontroller (6) is connected to the storage circuit (7), The microcontroller (6) is connected to the display circuit (8). Described microcontroller (6) is made up of launch controller (9), FIFO (10), digital signal processing module (11), CPU (12) and bus (13); Launch controller (9) connec...

Embodiment 2

[0040] Example 2, combined with Figure 4 , Figure 5 , the present invention utilizes electromagnetic ultrasonic technology to directly generate body waves incident at a certain angle to the surface of the steel plate in the steel plate to be tested, that is, obliquely incident SV waves (Shear Vertical Wave). Obliquely incident SV waves are sensitive to defects such as delamination, inclusions, hole shapes, and small cracks in the steel plate. In addition, since electromagnetic ultrasonic technology does not require acoustic coupling agents and pretreatment of specimens during detection, the oblique incident body waves generated by it can be used to detect steel plates in various harsh environments online or in service in real time.

[0041] The electromagnetic ultrasonic transverse and longitudinal detection units are composed of three electromagnetic ultrasonic probes, one of which works in the state of transmitting and receiving, and has an electromagnetic ultrasonic tran...

Embodiment 3

[0042] Example 3, combined with Image 6 , Figure 7 , the circuit system periodically stimulates the transceiver integrated probe in the detection unit under the control of the microcontroller to generate obliquely incident SV waves. The SV wave propagating in the steel plate will be reflected and scattered at the defect and the end surface, and the reflected and transmitted ultrasonic signals can be received by the electromagnetic ultrasonic transceiver integrated probe and two transmitted wave receiving probes respectively. The detection device collects and stores the received signal in the detection unit under the control of the microcontroller. The shape and location of the defect can be determined by analyzing the reflected and transmitted signals. The detection results will be displayed in real time under the control of the microcontroller. In order to realize 100% no blind spot detection on the steel plate, the detection unit of the present invention adopts a combin...

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Abstract

The invention aims at providing an automatic detection method of an oblique incidence body wave technical steel plate, which carries out comprehensive and fast detection to steel plates with the thickness of less than 75mm and accurately detects various defects, and a device thereof, and the device consists of an electromagnetic ultrasonic detection unit and a circuit system. The invention adopts the oblique incidence body wave mode to carry out detection to the steel plates, which not only is more sensitive to the detect in size, but also can detect the defects of cracks and the like, thus having more comprehensive detection result. The detection unit adopts a mode that transverse arrangement and longitudinal arrangement are combined, thus being more sensitive to the defects of the transverse and the longitudinal direction. The invention combines an ultrasonic transmission method and a reflection method, which not only has higher sensitivity to the defects, but also can position the defects precisely, thus having higher confidence level of the detection result. The invention has wider range for detecting the thickness of the wall of the steel plate, with the highest of 75mm, thus meeting the requirements for the steel plate with thick wall.

Description

(1) Technical field [0001] The invention relates to ultrasonic detection technology, in particular to an automatic detection method and device for steel plates with oblique incident body wave technology. (2) Background technology [0002] Steel plates are widely used in engineering construction, boiler pressure vessels, shipbuilding, oil and gas pipelines and other industries. Due to the particularity of these industries, most steel plates need to be tested before they can be used. Among the existing non-destructive testing technologies, ultrasonic testing is one of the most widely used technologies. At present, most of the steel plate ultrasonic testing equipment is manually scanned and tested by the operator with a piezoelectric ultrasonic probe. This type of equipment can only detect steel plates at room temperature due to the dependence on couplant, and this technology requires a certain pretreatment of the steel plate surface, so the labor intensity is high and the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01B17/00
Inventor 王淑娟康磊李智超段伟亮许霁芦铭辉翟国富
Owner HARBIN INST OF TECH
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