Multimode polymer chirped fiber Bragg grating for shock and detonation velocity

Yohan Barbarin (1) , Alexandre Lefrançois (1) , Vincent Chuzeville (1) , Pascal Hereil (1) , Sofiane Echaoui (1) , Louis Thamié (1) , Jérôme Luc (1)

1 DAM/GRAMAT - GRAMAT

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.

Domains: Engineering Sciences [physics]

Yohan Barbarin, Alexandre Lefrançois, Vincent Chuzeville, Pascal Hereil, Sofiane Echaoui, et al.. Multimode polymer chirped fiber Bragg grating for shock and detonation velocity. Applied optics, 2022, 61 (31), pp.9193-9197. ⟨10.1364/AO.474167⟩. ⟨cea-03909706⟩