Method for using higher standing wave resonance for quantitatively detecting thickness of elastic plates

Abstract

The invention relates to a method for using higher standing wave resonance for quantitatively detecting the thickness of elastic plates, which comprises the following steps: exciting vertical waves in the elastic plates through a sheet-shaped vertical wave piezoelectric transducer; transmitting the vertical waves in the elastic plates to the other surface of the elastic plates to be reflected and forming the standing wave harmonic vibration in the elastic plates; then, using a impedance analyzer or network analyzer for obtaining a higher standing wave resonance modes of the elastic plates; then, calculating the effective electromechanical coupling coefficient of each higher standing wave resonance mode; obtaining the parallel connection resonance vibration frequency of the resonance mode corresponding to the largest effective electromechanical coupling coefficient; and obtaining the thickness of the elastic plates according to the vertical wave sound resistance relationship of the sheet-shaped vertical wave piezoelectric transducer and the detected elastic plates in the thickness direction. The detection of the invention has higher sensitivity, in addition, the equipment is simple and can be easily realized, the sensitivity is high, and the observation is easy. The standing wave resonance of the elastic plates in the invention is sensitive to the surface conditions, and the corrosive conditions of the surfaces of the elastic plates can be marked.

Description

Technical field

[0001] The invention relates to a method for detecting the thickness of an elastic plate, in particular to a method for quantitatively measuring the thickness of the elastic plate and detecting the corrosion on the surface of the elastic plate by using high-order standing wave resonance. Background technique

[0002] In aviation, petrochemical industry, military and other fields, plate-shaped elastic materials (metal, non-metal and composite materials, etc.) are often used. The quality of these materials is related to their own elasticity and strength, and more importantly, the corrosion of the material surface The potential threat is often the main factor causing the accident. When a tank made of a plate-like elastic material is used for a period of time, the corrosive substances in the container will corrode the inner surface of the tank, and cracks, voids, and potholes will appear on the inner surface. The existence of these defects will affect the tank body. ...

Images