Abstract
Over the last decade, the use of chirped fibre Bragg gratings (CFBGs) in detonation velocity experiments has been steadily increasing. In this paper, we show how CFBG design parameters—chirp-rate, reflectivity and apodisation—affect linearity in detonation velocity tests. It is found that the optimal CFBG detonation velocity probe should have a high chirp-rate, a low reflectivity and no apodisation. As a further demonstration of these findings, we measure detonation velocity with a 24 cm optimised CFBG; the longest CFBG test of this kind so far.
Highlights
Detonation velocity is the propagation speed of a shockwave that is continuously driven through an explosive medium via exothermic chemical reactions [1]
Through simulation, that chirped fibre Bragg gratings (CFBGs) apodisation is unlikely to be beneficial for detonation velocity measurements
Since the amplified spontaneous emission (ASE) source was not gain-flattened, the raw data are S-shaped in correspondence with the variations in the power spectral density (PSD)
Summary
Detonation velocity is the propagation speed of a shockwave that is continuously driven through an explosive medium via exothermic chemical reactions [1]. For researchers concerned with the characterisation and assessment of explosive materials, detonation velocity can be a elucidative parameter [2]. In order to measure detonation velocity accurately, methods should be as non-invasive as possible, with fast read-out speeds and reliable calibration. Throughout many decades, several detonation velocity measurement techniques have been demonstrated. Long established techniques include ionisation or piezoelectric timing pins [1], streak and framing cameras [1], and continuous resistance electrical probes [3]. Often employing optical fibres, include fibre-coupled light detection [4], drilled fibre probes [5] and aluminium coated fibres (as timing pins) [6]
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