Metal defect detection method of laser-electromagnetic ultrasonic nondestructive testing system

An electromagnetic ultrasonic and non-destructive testing technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, etc., can solve problems such as large amplitude, and achieve the effects of simple equipment, good repeatability and high measurement accuracy

Active Publication Date: 2012-11-28
山东山科光电技术与装备研究院有限公司
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  • Application Information

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Problems solved by technology

It should overcome the shortcomings that the existing non-contact laser ultrasonic diffraction method is difficult to apply to the detection of rough surface materials, and because the electromagnetic ultrasonic sensor is located directly above the defect, the amplitude of the received defect diffraction ultrasonic signal is the largest, so it is easy to locate the defect

Method used

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  • Metal defect detection method of laser-electromagnetic ultrasonic nondestructive testing system
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  • Metal defect detection method of laser-electromagnetic ultrasonic nondestructive testing system

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Embodiment 1

[0029] Embodiment 1: The specific implementation method of metal material surface defect detection is as follows:

[0030] figure 1 It is a schematic diagram of a laser-electromagnetic ultrasonic nondestructive testing system. First, the pulsed laser, three-dimensional mechanical stepping device, transverse wave electromagnetic ultrasonic sensor, signal amplification and filtering unit, digital oscilloscope and computer are electrically connected in sequence, and the electromagnetic ultrasonic receiving unit is fixed on the three-dimensional mechanical stepping device. Calibrate the positions of the pulsed laser and the linear focusing unit so that they are placed concentrically. Adjust the position of the cylindrical lens in the linear focusing unit so that the distance between the 45-gauge steel and the cylindrical lens is 200 mm.

[0031] figure 2 A schematic diagram of artificially damaged surface cracks in No. 45 steel is given. The size of No. 45 steel is 400 mm×600 ...

Embodiment 2

[0034] Embodiment 2: The specific implementation method of detecting internal defects of metal materials is as follows:

[0035] Figure 5 A schematic diagram of the artificial damage holes inside the No. 45 steel is given. The size of the No. 45 steel is 900 mm × 200 mm × 300 mm. The hole-type artificial damage is processed inside 60 mm from the upper surface of the No. 45 steel by the drilling and milling machining center. , whose dimensions are 7 mm×30 mm, 5 mm×30 mm and 3 mm×30 mm in turn, and the detection results of 3 mm×30 mm holes are given in the examples. The output energy of the calibrated pulse laser is 150 m J / pulse, and the position of the cylindrical lens in the linear focusing unit is adjusted so that the two are placed concentrically, and the surface of the 45th steel to be detected is located in the cylindrical lens of the linear focusing unit. focal length. Turn on the working power of the transverse wave electromagnetic ultrasonic sensor and the three-dim...

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Abstract

The invention relates to a metal defect detection method of a laser-electromagnetic ultrasonic nondestructive testing system. The method adopts the laser-electromagnetic ultrasonic testing system composed of a pulsed laser, a linear focusing unit, a transverse wave electromagnetic ultrasonic sensor, a three-dimensional mechanical stepping device, a signal amplification filtering system, a digital oscilloscope and a computer. The system is utilized to excite a Gaussian laser pulse, which is then delivered to the surface of a metal material through an optical focusing system, and at the same time surface waves as well as transverse waves are excited. The transverse wave electromagnetic ultrasonic sensor is used for receiving, and on the basis, positioning detection of the surface and near surface defects can be performed. The method makes use of the transverse wave electromagnetic ultrasonic sensor to receive diffraction transverse waves generated when the transverse waves encounter an internal defect, and when the sensor is position right above a metal material internal defect, the received diffraction transverse wave signal has the strongest amplitude, so that the horizontal position of the defect can be determined, and the vertical position of the defect can be determined by the defect echo time. The method can realize detection of metal material surface, near surface and internal defects at the same time.

Description

technical field [0001] The invention relates to a metal defect detection method of a laser-electromagnetic ultrasonic nondestructive testing system, belonging to the field of ultrasonic nondestructive testing and evaluation. Background technique [0002] So far, no practical method of non-contact ultrasonic diffraction detection based on laser-electromagnetic ultrasonic technology that can be applied to metal material defects has been seen. The ultrasonic diffraction method has the advantages of high detection accuracy and fast speed when detecting material defects. At present, since most ultrasonic diffraction methods used to detect internal defects of materials are based on contact piezoelectric ultrasonic technology, the detection sensitivity is greatly affected by the coupling state. In the article "Time-of-Flight Diffraction Measurement Using Laser Ultrasound", Mihara proposed that laser can be used to excite ultrasonic waves and combined with laser interferometer to r...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 赵扬贾中青马健宋江峰郭锐刘帅孙继华翟瑞占
Owner 山东山科光电技术与装备研究院有限公司
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