Time domain double diffraction at a pair of coplanar skew edges

A time domain version of the uniform description of double diffraction at a pair of coplanar skew edges is presented, with source and observation at a finite distance. The time domain (TD) field description is obtained by direct Fourier inversion of the frequency domain (FD) doubly diffracted (DD) field. The TD-DD field response to a more general pulsed excitation is obtained via convolution. If the exciting signal has no low-frequency components and is thus dominated by high frequencies, the range of validity of the resulting pulsed response is enlarged to later observation times behind the wavefront. The present TD-DD field is limited to real time, and matches and compensates the spatial discontinuity of the TD singly diffracted field.