| The development of modern science and technology has pushed precision guidance technology and detection technology to a new level,making the position of stealth coating technology in the military field more and more important.The application of stealth coating technology has improved the survival and defense capabilities of weapon systems.Therefore,many countries are paying more and more attention to the research of stealth coating technology.In the process of development and service of the stealth coating,the thickness of the coating is a key factor affecting the stealth performance of the coating.Therefore,it is necessary to study the detection method of the stealth coating thickness.In the coating thickness detection method,according to the properties of the coating material,there are many traditional non-destructive testing methods.However,according to the published literature and reports,there are very few non-destructive testing methods for the thickness of the stealth coating.The particularity of layer material properties makes the traditional non-destructive testing methods ineffective.Based on the material properties of the infrared coating and the wave-absorbing coating of the stealth coating,this paper proposes an electromagnetic detection method to measure the thickness of the two coatings simultaneously.The research content mainly includes:1.Through the analysis of the magnetic field theory,the magnetic field distribution is obtained,and the magnetic induction intensity at any point in the magnetic field can be calculated.The magnetic permeability characteristics of the absorbing coating are analyzed,and a coating thickness detection method based on magnetic saturation is proposed.The relationship between the magnetic induction intensity and the thickness of the coating is studied,and it is determined that the relationship between the magnetic induction intensity and the thickness of the double-layer coating can be fitted with a binary high-order polynomial.2.According to the electromagnetic detection theory,a finite element simulation model was established and simulated,and the relevant data was imported into a binary polynomial for fitting.According to the fitting accuracy requirements,a binary cubic polynomial detection model was finally established,which can fit The relationship between the magnetic induction intensity and the thickness of the double-layer coating,and the error is within the design accuracy index requirements;under the condition of meeting the detection accuracy of the binary cubic polynomial fitting model,the applicable range of the relative permeability of the absorbing coating is determined;According to the inspection flow chart,the thickness inspection of the project coating samples was carried out,and the experimental verification was completed.3.The noise verification was carried out on the determined fitting model of the coating thickness of the two-dimensional and cubic polynomial.After filtering the magnetic induction intensity data containing noise,the thickness of the infrared coating and the wave-absorbing coating is fitted by a fitting model,and the signal-to-noise ratio and the root mean square error of the fitted coating thickness are calculated.The wavelet soft threshold The effect of the denoising method is relatively good,which verifies the feasibility of the binary and cubic polynomial coating thickness fitting model to detect the thickness of two coatings at one time under the interference of white noise. |
