Transient strain monitoring on a gun barrel using optical fiber Bragg grating sensors

Applied optics to engineering photonics: a retrospective

“…43), geotechnical applications [114][115][116], aerodynamic pressure sensing [117] and rail monitoring [118]. For example, we undertook dynamic strain measurement on a 30-mm diameter gun barrel where the exit velocity of the shell was more than 1 km/s and demonstrated that FBG sensors were capable of monitoring transient strain signatures of duration of less than 100 µs and magnitudes up to 10,000 µm/m [113]. The rationale for this work is to investigate FBG sensors, and the immunity to electromagnet fields that they offer, as replacements for resistive foil strain gauges which would not work in the harsh electromagnetic environment of guns based upon electromagnetic, electro-thermal or electro-chemical propulsion.…”

“…The rationale for this work is to investigate FBG sensors, and the immunity to electromagnet fields that they offer, as replacements for resistive foil strain gauges which would not work in the harsh electromagnetic environment of guns based upon electromagnetic, electro-thermal or electro-chemical propulsion. Ⅰ and Ⅱ FBG sensors and Ⅲ resistive foil strain gauge [113].…”

“…This led us to investigate the mechanical and thermal performance of FBGs to assess the influence of stripping the jacket and hydrogen loading in order to fabricate the FBG (Fig. 42) The application areas to which we have applied FBG sensors are extensive including, for example, sensors for cure and health and usage monitoring in composite materials for aerospace and cryogenic applications [105111], structural monitoring [112], dynamic measurements on military gun barrels [113] (Fig. 43), geotechnical applications [114][115][116], aerodynamic pressure sensing [117] and rail monitoring [118].…”