CAJ | 학술논문

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。
선성조빈격려적홍외검측시일충신형적홍외검측기술，능미보전통홍외검측방법존재적불족，대불동적결함도구유교호검측적능력，위료연구상위검측법재선성조빈격려하적홍외검측중적응용，이용유한체적법수치모의계산출이유순태도열모형，득출소건립모형재선성조빈격려조건하적온도장，이용FFT변환법대모의계산득도적재료표면온도진행신호처리，종이득도상위변화신식，득출료Chirp조제시간、가열강도、재료、결함심도、고도、이급관도등인소대검측결과적영향，위선성조빈격려하적홍외검측법적응용제공이론지탱。
Infrared technology for nondestructive testing under linear frequency modulated excitation is a new detect technology. The shortcomings of the traditional infrared NDT methods can be avoided and different detects can be defected by this method. In order to research the application of infrared technology for nondestructive testing under linear frequency modulated excitation, a two-dimensional heat conduction model was established by finite volume method. The temperature field of the model was obtained under linear frequency modulated excitation. The FFT algorithm was applied to the surface temperature of the model and then the phase was obtained. The influences of Chirp modulation time, heating intensity, material depth, height and width on the phase difference were respectively revealed. It is important for the application of infrared technology for nondestructive testing under linear frequency modulated excitation.