Abstract
Shock and detonation velocities are today measured continuously using long silica
chirped fiber Bragg gratings (CFBGs). These thin probes can be
directly inserted into high-explosive samples. The use of a polymer
fiber increases the sensitivity at low pressure levels when studying,
for instance, shock-to-detonation transitions in wedge tests. The
22-mm-long multimode polymer CFBGs have, therefore, been manufactured
and characterized. A first detonation experiment was realized on a
narrow Formex strip using such a sensor. The feasibility is
demonstrated, and the associated uncertainties, mostly coming from the
use of a multimode fiber, are discussed.
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering