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提出了一种基于快速逆衍射算法对辐射计温度校准源的近场测量中的杂散波进行分析和消除的方法.逆衍射算法是利用测量场计算逆向传播到源平面处的衍射场的方法.基于直接积分的快速傅里叶转换(FFT-DI,Fast-Fourier-Transform Direct Integration)算法和衍射高斯波束分析(DGBA,Diffracted Gaussian Beam Analysis)算法与逆衍射算法相结合得到快速逆衍射算法.根据快速逆衍射算法提出了近场测量的分析步骤,并且给出了滤除杂散波后的被测物体的衍射场,其验证了该方法的有效性.此外,为了达到更高的效率,建议将2种快速逆衍射算法结合使用.
A method of analyzing and eliminating spurious waves in the near-field measurement of a radiometer temperature calibration source based on a fast inverse diffraction algorithm is proposed. The inverse diffraction algorithm is a method of using the measurement field to calculate the diffraction field propagating backwards to the source plane The fast inverse diffraction algorithm based on the Fast-Fourier-Transform Direct Integration (FFT-DI) algorithm and the Diffracted Gaussian Beam Analysis (DGAA) algorithm is combined with the inverse diffraction algorithm. According to the fast inverse diffraction algorithm, the analysis steps of near-field measurement are proposed, and the diffraction field of the measured object after filtering the spurious wave is given, which verifies the validity of the method.In addition, in order to achieve higher efficiency, It is recommended to combine two rapid inverse diffraction algorithms.