Abstract
Dynamic elastic strain in ~1.8 and 1.0 m diameter containment vessels containing a high explosive detonation was measured using an array of fiber Bragg gratings. The all-optical method, called real-time localized strain measurement, recorded the strain for 10 ms after detonation with additional measurements being sequentially made at a rate of 1.7 MHz. A swept wavelength laser source provided the repetition rate necessary for such high-speed measurements while also providing enough signal strength and bandwidth to simultaneously measure 8 or more unique points on the vessel’s surface. The data presented here arethen compared with additional diagnostics consisting of a fast spectral interferometer and an optical backscatter reflectometer to show a comparison between the local and global changes in the vessel strain, both dynamically and statically to further characterize the performance of the localized strain measurement. The results are also compared with electrical resistive strain gauges and finite element analysis simulations.
Highlights
Fiber Bragg gratings (FBG) are routinely used for making static and dynamic strain and temperature measurements up to the kHz range [1,2,3]
The experiment consisted of 8 FBG based strain gauges for use with the inside a 1.8 m containment vessel at the Dual Axis Radiographic Hydrodynamic Test (DARHT)
real-time localized strain (RTLS) technique and 2 single fibers wrapped around the vessel for the Luna measurements and the facility at Los Alamos National Lab
Summary
Fiber Bragg gratings (FBG) are routinely used for making static and dynamic strain and temperature measurements up to the kHz range [1,2,3]. Significant improvements have been made to FBGs to improve strength and versatility [4,5,6] while improving sensitivity [7,8] Such measurements have been used in industry for many years, for example, in testing strain in airplanes [9] and bridges [10]. Sensors 2020, 20, x FOR PEER REVIEW measuring detonation even some strain in process the detonation [13,14]. These detonationthe wavefront and wavefront even someand strain in the detonation [13,14].
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