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线性调频激励的红外检测是一种新型的红外检测技术,能弥补传统红外检测方法存在的不足,对不同的缺陷都具有较好检测的能力,为了研究相位检测法在线性调频激励下的红外检测中的应用,利用有限体积法数值模拟计算出二维瞬态导热模型,得出所建立模型在线性调频激励条件下的温度场,利用FFT变换法对模拟计算得到的材料表面温度进行信号处理,从而得到相位变化信息,得出了Chirp调制时间、加热强度、材料、缺陷深度、高度、以及宽度等因素对检测结果的影响,为线性调频激励下的红外检测法的应用提供理论支撑。
Linear frequency modulation excitation infrared detection is a new type of infrared detection technology that can make up for the shortcomings of the traditional infrared detection methods for different defects have better detection capabilities in order to study the phase detection method under the linear frequency modulation excitation of infrared detection , The two-dimensional transient thermal model is calculated by the finite volume method numerical simulation, and the temperature field of the model is obtained under the condition of the linear frequency modulation excitation. The simulated surface temperature of the material is processed by FFT to signal The phase change information was obtained and the influence of Chirp modulation time, heating intensity, material, defect depth, height and width on the detection results was obtained, which provided theoretical support for the application of the infrared detection method under the chirp excitation.