Propagation characteristics of nanosecond pulse laser-induced shock wave and the non-contact removal of particle

摘要

The evolution from propagation characteristics of nanosecond pulse laser-induced air plasma shock wave to the non-contact removal of particle is investigated theoretically and experimentally. The characteristic parameters of the plasma, electron number and temperature are discussed in detail. And the theoretical simulation analysis of the propagation characteristics of the plasma shock wave shows that the propagation velocity and pressure field are closely related to time and energy, and specially the pressure decreases with the increase in the propagation distance. Meanwhile, the motion state of driven particles under the pressure of shock wave is observed by means of high-speed photographic. Consistent with the pressure characteristics of the shock wave, the particles motion velocity is strongly dependent on laser energy and driving gap. On these foundations, a series of experiments are also carried out to demonstrate the removal of contaminated particles from the surface of the optical fiber ring by shock wave, where the fiber ring is detected without damage. This technology not only has the advantages of non-contact and high efficiency, but also realizes relatively larger cleaning region at microscale.