Detonation Velocity Measurements Using Rare-Earth Doped Fibres

Abstract

In this paper, a simple detonation velocity measurement scheme is presented, which exploits the length-dependent amplified spontaneous emission (ASE) power emitted by off-the-shelf Er-doped fibres. This measurement scheme is first calibrated using cutback tests, so that minimal processing is required between data collection and velocity readout. We then demonstrate the use of this method in an explosive cylinder test and achieve a spatial resolution of approximately ±2 mm, owing to its implementation in a helical geometry. Alongside the standard Er fibres, a specially made, high-concentration Er/Yb-doped fibre is also calibrated, which demonstrates a potential spatial resolution approaching ±20 μ m.

Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings

“…One limitation might be that, to make longer sensors (>50 mm), the refractive index modulation reduction might reach a limit. The same year, the same authors reported in Reference [24] the use of rare-earth doped fibers. The sensor section of the fiber is doped with erbium and ytterbium ions and is pumped like an erbium-doped fiber amplifier (EDFA).…”

Development of a Reference Device for the Calibration of Optical One-Shot Time-Interval Measurements

“…One of the basic measurements when testing explosive substances is the measurement of detonation velocity. Therefore, various measurement methods for detonation velocity have been developed [1][2][3][4][5][6]. One of the methods measures average velocity of detonation (VOD) indirectly as the time interval between two light pulses that are obtained from two different positions from the tested sample at some distance [2].…”