Affiliations: [a] School of Equipment Engineering, Shenyang Ligong
University, Shenyang, Liaoning, China | [b] State key laboratory of explosive science and
technique, Beijing Institute of Technology, Beijing, China
Abstract: Impact light flash is an intense light flash released when a target
is impacted by a hypervelocity projectile. Light flash is caused by emissions
from a jet of shocked material which is thrown from the impact site. Impact
light flash phenomenology is now being considered for applications where remote
diagnostics are required to observe and diagnose impacts on satellites and
spacecraft. Additionally, this phenomena and remote diagnostics are under
consideration for deep space exploration and missile defense applications.
Currently, optical signatures created from hypervelocity impact can be utilized
as the basis for detectors (spectrometers, pyrometers), which characterize the
material composition and temperature. To establish this capability technically
in the laboratory, we have conducted a series of experiments on a two-stage
light gas gun at impact velocities ranging from 1.96 to 4.21 km/s. The focus of
this work is to develop a flash signatures collected methods for use as a
reliable light flash, and late time radiating evolution to characterize
material behavior in the shocked and expanding state; ascertain scaling of
light flash with impact velocity, and determine the temperature of the impact
flash resulting from radiating emissions when photomultiplier tube (PMT) are
used in conjunction with narrow band pass filtering at specific wavelengths as
a pyrometer. The results of these experiments are discussed in detail using
natural dolomite target.
