Abstract
To investigate light flash produced during hypervelocity impact in the laboratory, we have conducted a series of experiments on a two-stage light gas gun at different impact velocities and the same impact angle. Light flash were acquired through optical fiber pyrometer measurement system during the whole physical process in hypervelocity impact, Experimental results showed that the maximum light flash intensity decreases with impact velocity increasing, and maximum light flash intensity should exist a critical impact velocity for polycarbonate projectile impacting natural dolomite plate, which may be between 2.52 km/s and 4.21 km/s at the wavelength of 550 nm–700 nm. In addition, the light flash intensity peak value was 0.4 ∼ 0.5 mW.cm