A laser shock wave bonding force detection method based on electromagnetic ultrasonic technology

Abstract

The invention relates to the fields of laser technology and electromagnetic ultrasound, in particular to a method for detecting the bonding force of laser shock waves based on electromagnetic ultrasound technology. In the present invention, the detection device is composed of an electromagnetic induction coil, a black tape, an EMAT electromagnetic ultrasonic transducer, a natural strong magnet, a coil, a high-energy laser, and a comprehensive detection system; The coil is converted into an induced voltage signal in the EMAT electromagnetic ultrasonic transducer. The entire detection device and method have a simple structure, simple operation, fast and accurate detection and judgment, and are applicable to online detection of laser shock wave bonding force of non-conductive materials such as carbon fiber composite materials, ceramics, special coatings / films, etc.

Description

technical field [0001] The invention relates to the fields of laser technology and electromagnetic ultrasound, in particular to a method for detecting the bonding force of laser shock waves based on electromagnetic ultrasound technology. Background technique [0002] Laser Shock Wave Bonding Detection Technology (LaserBond Inspection, LBI) is a new type of interface bonding force detection technology. It uses high-power nanosecond pulse laser to irradiate the surface of the material, and the surface of the material absorbs the protective layer (aluminum foil, black tape, etc.) to absorb the laser energy. , rapid explosive gasification and evaporation, forming a high-pressure plasma shock wave, the shock wave first propagates into the material in the form of a compression wave, but is transformed into a stretching wave after being reflected on the back, when the stress value of the stretching wave exceeds the structure such as material bonding or interface If the bonding stre...

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Problems solved by technology

The above method cannot be applied in the online detection process of actual engineering components due to expensive equipment, complicated testing and inability to go online.

[0004] Although the ultrasonic transducer can be used in the online detection of engineering components to monitor the dynamic response signal of the material relatively simply, the operation process of the piezoelectric ultrasonic transducer is complicated and has many influencing factors due to the need for coupling agent; the electromagnetic ultrasonic transducer The transducer has received more attention and research because of its characteristics of no coupling, non-contact, simple operation, and wide temperature range, but the principle limits its application to non-conductive materials such as carbon fiber and ceramics. A laser shock wave bonding force detection method that can be used for non-conductive materials is invented on the basis of

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