Method for increasing air-coupled ultrasonic detection signal strength of composite material

Abstract

The invention discloses a method for increasing air-coupled ultrasonic detection signal strength of a composite material. The method comprises the following steps: step one, placing a workpiece between a first air-coupled transducer and a second air-coupled transducer; step two, sticking two thin layers on the upper and the lower surfaces of the workpiece; step three, stimulating the first air-coupled transducer, enabling the ultrasonic waves emitted by the first air-coupled transducer to pass through upper side air, the upper side thin layer, the workpiece, and the lower side thin layer and lower side air in sequence, and reaching to the second air-coupled transducer; and step four, feeding back a signal received by the second air-coupled transducer to a computer and generating an image and data; the invention provides a method and technology for conducting impedance matching on the detected workpiece, so that ultrasonic waves reflected back and forth in the thin layers are kept in the same phase when transmitting the thin layers, so as to realize the enhanced energy transmission effect similar to the resonance and improve the detection sensitivity of a whole detection system, and thin layer materials can be recycled.

Description

technical field [0001] The invention relates to the technical field of ultrasonic detection, in particular to a method for increasing the strength of air-coupled ultrasonic detection signals of composite materials. Background technique [0002] The physical principle of air-coupled ultrasonic testing is similar to that of traditional piezoelectric ultrasonic, but traditional piezoelectric ultrasonic requires water or other viscous reagents as the coupling medium, while air-coupled ultrasonic does not require any coupling medium (or air as the coupling medium). And there is no requirement to detect the material properties of the workpiece. Air-coupled ultrasonic technology is mostly used for flaw detection and material property testing of multilayer composite materials, adhesive materials, lithium batteries, rubber materials, foam materials, and metal materials, and is widely used in component testing in aerospace, automotive, and shipbuilding industries. [0003] Since wate...

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Problems solved by technology

Due to the physical characteristics of the air-coupled ultrasonic technology itself, the above methods sometimes do not all achieve satisfactory results.

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