Analysis on the influence mechanism of conical shock wave on pulsed laser forward detection

Abstract

In order to study the influence mechanism of conical shock waves on pulsed laser forward detection, an analytical method is proposed for arbitrary Mach number and cone angle conditions. Based on traditional gas dynamics and physical optics, a simplified model of Gaussian beam transmission across the conical shock wave flow field is established. On this basis, combined with the process of pulsed laser detection, the analytical expression of pulsed laser echo waveform under the influence of shock wave is derived. Simulation results show that the conical shock wave under different conditions can lead to beam deflection, focus, and reflection to different degrees. Furthermore, the variation of echo waveform caused by aero-optical effect is also analyzed, and it is shown that the peak power, pulse width and arrival time of echo all fluctuate greatly with rolling motion at different shock angle and cone angle, among which the shift of the arrival time and the reflection effect of shock wave have the largest impact on laser detection.